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Genesis of pink diamonds in lamproite and low-Ti-type kimberlite pipes on craton margins 认领 引用
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作者 GROVES DI ZHANG Liang +1 位作者 CHEN ZuYan BAI Feng 《岩石学报》 SCIE EI CAS CSCD 北大核心 2026年第2期383-392,共10页
Diamonds were formed in the mantle lithosphere,mostly at depths of 150~200km in the centres of Precambrian cratons,the buoyant ancient cores of continents.From there they were normally transported into the upper crust... Diamonds were formed in the mantle lithosphere,mostly at depths of 150~200km in the centres of Precambrian cratons,the buoyant ancient cores of continents.From there they were normally transported into the upper crust in kimberlite pipes whose diamonds are largely colourless and light yellow related to trace element N(Ia type),although brown,green,and more rarely blue-coloured diamonds are related to lattice defect and trace amounts of H,more rarely B and Ni.Pink diamonds are extremely rare in the approximately 90 diamondiferous pipes mined globally.Although small quantities have been discovered elsewhere,about 90%have been mined from the ca.1.3Ga Argyle diamond pipe in Western Australia,with the Arkhangelskaya diamond pipe in Russia the only other significant source.The pink colour at both Argyle and Arkhangelskaya is unrelated to trace elements and instead results from absorption of light from nanoscale(550nm)defects related to shear stress and plastic deformation.Macroscopically,defects are shown by glide planes,lamellae,and grain lines imposed on the originally colourless diamonds derived from their mantle source.The key question is why these defects were uniquely acquired in diamonds in the Argyle and Arkhangelskaya pipes.Unlike most diamondiferous pipes,Argyle is a rare diamondiferous volatile-rich lamproite pipe that was emplaced into the multiply deformed and rifted NNE-trending Halls Creek Orogen on the margin of the Kimberley Craton.Similarly,Arkhangelskaya in the Devonian Lomonosov kimberlite cluster is a volatile-rich low-Ti type kimberlite,a close relative to lamproite,that was emplaced into the multiply deformed Lapland-Kola Orogen on the rifted margin of the Kola Craton.These craton margins are underlain by subduction-induced volatile-enriched metasomatized mantle lithosphere in contrast to the more primeval mantle under craton centres.It is thus likely that shear stresses were exacerbated at Argyle and Arkangelskaya by rapid vertical emplacement of the anomalous volatile-enriched magmas at supercritical pressures and temperatures,that induced catastrophic phase separation of these volatiles and'mini seismic events'during rapid pressure drops during ascent from 200km depth to the surface.Such a mechanism is consistent with the presence of strongly resorbed and plastically deformed small brown industrial diamonds in the Argyle pipe.From a China perspective,it is potentially important that at 1.3Ga the alkaline Argyle pipe in northern Australia is placed adjacent to the North China Craton(NCC),with numerous world-class mineral deposits including the giant ca.1.4~1.2Ga alkaline Bayan Obo REE system on its margin.However,it is the southeastern margin of the Yangtze Craton and the Jiangnan Orogen with their lamproite pipes derived from metasomatized mantle lithosphere that present the most prospective regions for pink diamond occurrences. 展开更多
关键词 Pink diamond Plastic deformation Lamproite Low-Ti-type kimberlite Craton margin
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Evaluating climate-induced productivity of typical ecosystems of the eastern margin of the Qinghai-Tibet Plateau 认领 引用
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作者 ZHENG Huazhu YAO Zhengyu +6 位作者 LU Jungang WU Yongjiao YE Quan ZHAO Hongfei OUYANG Maolin Claudio ODELANG HE Hongming 《Journal of Geographical Sciences》 SCIE CSCD 2026年第1期107-128,共22页
Ecosystems along the eastern margin of the Qinghai-Tibet Plateau(EQTP)are highly fragile and extremely sensitive to climate change and human disturbances.To quantitatively assess climate-induced ecosystem responses,th... Ecosystems along the eastern margin of the Qinghai-Tibet Plateau(EQTP)are highly fragile and extremely sensitive to climate change and human disturbances.To quantitatively assess climate-induced ecosystem responses,this study proposes a Climate-Induced Productivity Index(CIPI)based on the Super Slack-Based Measure(Super-SBM)model using remote sensing data from 2001 to 2020.The results reveal persistently low CIPI values(0.47-0.53)across major ecosystem types,indicating widespread vulnerability to climatic variability.Among these ecosystems,forests exhibit the highest CIPI(0.55),followed by shrublands(0.54),croplands(0.53),grasslands(0.51),and barelands(0.43).The Theil index analysis further demonstrates significant intra-group disparities,suggesting that extreme climatic events amplify CIPI heterogeneity.Moreover,the dominant environmental drivers differ among ecosystem types:the Palmer Drought Severity Index(PDSI)primarily constrains grassland productivity,solar radiation(SRAD)strongly influences shrub and cropland systems,whereas subsurface factors exert greater control in forested regions.This study provides a quantitative framework for evaluating climate-ecosystem interactions and offers a scientific basis for long-term ecological monitoring and security planning across the EQTP. 展开更多
关键词 climate-induced productivity index(CIPI) Super-SBM model ecosystem vulnerability environmental drivers eastern margin of Qinghai-Tibet Plateau
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Letter to the Editor:Deep margin positivity in small rectal neuroendocrine tumors-pathological insights for post-endoscopic submucosal dissection management 认领 引用
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作者 Ling-Feng Zou Yan Luo Cheng-Long Wang 《World Journal of Clinical Oncology》 2026年第5期225-228,共4页
The management of small rectal neuroendocrine tumors(NETs)with positive vertical margins after endoscopic resection remains controversial.In light of the recent study by Qiao et al published in World Journal of Clinic... The management of small rectal neuroendocrine tumors(NETs)with positive vertical margins after endoscopic resection remains controversial.In light of the recent study by Qiao et al published in World Journal of Clinical Oncology,which reported excellent oncologic outcomes following both endoscopic submucosal dissection(ESD)and hybrid ESD for stage 1 rectal NETs,we provide a pathology-centered reinterpretation of margin positivity.Despite multiple non-R0 resections,predominantly due to positive vertical margins,no patients developed local recurrence or metastasis.From a histopathological perspective,apparent margin involvement is frequently attributable to technical artifacts such as thermal injury,tissue distortion,tangential sectioning,or specimen fragmentation rather than true residual viable tumor.Moreover,the intrinsic biological indolence of small,well-differentiated(G1)rectal NETs further explains the low risk of recurrence.Together,these observations support a risk-stratified,surveillance-oriented management strategy and underscore the importance of nuanced pathological interpretation to avoid unnecessary salvage surgery while maintaining oncologic safety. 展开更多
关键词 Rectal neuroendocrine tumor Endoscopic submucosal dissection Positive vertical margin Non-R0 resection Pathologic margin assessment
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A stepwise algorithm for community detection based on marginal utility and neighborhood 认领 引用
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作者 Jie Liu Jiaqi Zhang +1 位作者 Yang Yang Jiayang Zhao 《Journal of University of Science and Technology of China》 CAS CSCD 北大核心 2026年第2期14-24,I0001,共11页
Abstract:Community detection is a pivotal research area in network analysis.In this context,the nodes on the borders of multiple communities are of great significance,attributed to their crucial positions in the infor... Abstract:Community detection is a pivotal research area in network analysis.In this context,the nodes on the borders of multiple communities are of great significance,attributed to their crucial positions in the information flow of communities.From the perspective of a special disposition of such nodes,this study proposes a novel community detection method termed the AIA(acquisition-integration-allocation)algorithm to improve community detection.The algorithm consists of three steps:①isolating certain nodes and creating multiple components to refine the structure of a network based on the principle of diminishing marginal utility and neighborhood information;②integrating the components as the base of communities via the spectral clustering method;and③allocating the unprocessed nodes through label transfer and the Graclus distance.Experimental validations on both synthetic and real-world datasets demonstrate the effectiveness of the proposed approach. 展开更多
关键词 community detection spectral clustering marginal utility neighborhood
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Changes in sea ice properties in the transition region from pack ice zone to marginal ice zone in the Arctic Ocean 认领 引用 被引量：1
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作者 CHEN Ying LI Na +3 位作者 WANG Zihan QU Meng LIN Long LEI Ruibo 《Advances in Polar Science》 CSCD 2026年第2期212-222,共11页
The transition from pack ice zone(PIZ) to marginal ice zone(MIZ) is a critical driver of Arctic climate change, significantly intensifying heat exchange within the atmosphere–sea ice–ocean system. This exchange is c... The transition from pack ice zone(PIZ) to marginal ice zone(MIZ) is a critical driver of Arctic climate change, significantly intensifying heat exchange within the atmosphere–sea ice–ocean system. This exchange is closely coupled with variations in the physical state and dynamics of sea ice. However, the evolution of sea ice properties during this transition remains insufficiently quantified. To address this problem, this study compares variations in key sea ice characteristics across three regions: perennial PIZ, PIZ transitioning to MIZ, and MIZ transitioning to open water. Results indicate that the transition from PIZ to MIZ coincides with accelerated ice loss, with the most pronounced declines in concentration(–1.3%·a–1) and thickness(–0.04 m·a–1) in September, and in area(–4.2×104 km2·a–1) in October. This transition is accompanied by a dramatic loss of multi-year ice, peaking at –1.8%·a–1 in August. Furthermore, this transition corresponds to higher ice drift speeds and enhanced responses of sea ice motion to wind forcing, particularly in October(0.12 km·d–1·a–1 and 0.02 a–1) when the transition extent reaches its maximum. An earlier melt onset on ice surface occurs in some parts of the transition region from PIZ to MIZ in May(–0.4 d·a–1, P<0.05), and a delayed continuous freeze onset is observed in this transition region in October(1.0 d·a–1, P<0.05). This transition region exhibits amplified sea ice changes relative to the pan-Arctic Ocean. 展开更多
关键词 Arctic Ocean marginal ice zone sea ice properties
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Orderly hydrocarbon accumulation pattern in passive continental margin basins on both sides of the South Atlantic 认领 引用
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作者 WEN Zhixin LIU Zuodong +3 位作者 XU Ning LI Gang HE Zhengjun SONG Chengpeng 《Petroleum Exploration and Development》 SCIE 2026年第1期79-95,共17页
Based on the plate tectonics theory,the sedimentary environment of paleotectonics along the passive continental margins on both sides of the South Atlantic Ocean was reconstructed using the paleomagnetic,regional geol... Based on the plate tectonics theory,the sedimentary environment of paleotectonics along the passive continental margins on both sides of the South Atlantic Ocean was reconstructed using the paleomagnetic,regional geological,and seismic data,and the intrinsic relationships of hydrocarbon distribution in the passive continental margin basins and the differential hydrocarbon accumulation patterns were analyzed.Results show that basins on both sides of the South Atlantic experienced two major extensional phases—rift and depression—and four evolutionary stages:the Early Cretaceous Berriasian-Barremian intracontinental rift stage,the Early Cretaceous Aptian-Albian intercontinental rift to initial drift transition stage,the Late Cretaceous-Paleogene drift-related marine transgressive depression stage,and the Neogene-Quaternary drift-related marine regressive depression stage.According to basin architecture and superposition style,the passive-margin basins are classified into two principal types:rift-continental marginal depression composite and continental marginal depression-dominated.The basins in the study area were further divided into six types based on the development degree of salt tectonics and the type of dominant sand bodies,i.e.salt-free rift-continental marginal gravity-flow composite type,salt-free rift-continental marginal delta composite type,salt-bearing rift-continental marginal gravity flow composite type,delta-dominated salt-bearing rift-continental marginal delta composite type,gravity-flow-dominated continental marginal depression type,and delta-dominated continental marginal depression type.The salt-free rift-continental marginal gravity flow and delta composite basins are mainly distributed in the southern segment.The salt-bearing rift-continental marginal gravity flow and delta composite basins are mainly distributed in the central segment.The gravity-flow-dominated continental marginal depression basins are mainy distributed in the northern segment.The delta-dominated passive-margin depression basins are distributed in three segments from north to south.In different types of basins,distinctive depositional systems and source-reservoir-caprock assemblages were formed in each upper/lower structure layer.The superimposition and evolution of multi-phase prototype basins result in the orderly hydrocarbon accumulation vertically and laterally,which are“segmented along-strike,zoned across-strike,and layered vertically”. 展开更多
关键词 South Atlantic Ocean tectonic-sedimentary environment passive continental margin basin prototype basin rift depression fault depression pre-salt in deep water large oil and gas field
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Multi-Stage Magmatic and Hydrothermal Events Formed Giant Caosiyao Porphyry Mo Deposit in the Northern Margin of North China Craton 认领 引用
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作者 Peiwen Chen Tiancheng Zhou +1 位作者 Yong Fu Qingdong Zeng 《Journal of Earth Science》 SCIE CAS CSCD 2026年第1期92-113,共22页
The formation of Caosiyao giant porphyry Mo deposit is related to three granitic porphyries:coarse-grained granite porphyry(CG),fine-grained granite porphyry(FG),and giant plagioclase phenocryst bearing granite porphy... The formation of Caosiyao giant porphyry Mo deposit is related to three granitic porphyries:coarse-grained granite porphyry(CG),fine-grained granite porphyry(FG),and giant plagioclase phenocryst bearing granite porphyry(PG).To investigate the mineralization significance of three porphyries,Microthermometry,Laser micro-Raman Spectra,and H-O-He-Ar isotope analyses of fluid inclusions were conducted.Intermediate density with high temperatures(>550℃)and moderate-low salinities(~10 wt.%)characterizes CG-related initial exsolved fluids.Vapor-rich and brine phases separated from the initial fluid following a continuous decrease in pressure and temperature,inducing molybdenite precipitation.FG-related initial fluids are characterized by high temperatures(>550℃)and salinities(>65 wt.%).The mixing of low-salinity fluids led to a rapid decrease in the salinity of FG-related fluid,promoting the deposit of the Mo element.The lead-zinc mineralization is closely related to the FG-related fluid,and the addition of meteoric fluid induced the formation of galena and sphalerite.The ore-forming fluid related to the PG is CO2-rich and accompanied by the addition of mantle-derived He-Ar.The presence of CO2 did not contribute to the solubility of Mo,resulting in the absence of a considerable amount of molybdenite. 展开更多
关键词 fluid inclusion microthermometry H-O-He-Ar Caosiyao northern margin of NCC
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Study on the Safety Margin of the Hull Beams for the Ore Carrier based on the Uncertain Loads Combination Method 认领 引用
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作者 SHI Wei DING Shi-feng ZHAN Zhi-hu 《船舶力学》 EI CSCD 北大核心 2026年第6期984-994,共11页
The maritime environment and loading conditions encountered by large ore carriers are highly complex.It is a problem worth studying to scientifically describe the uncertain load of ore carriers and evaluate the safety... The maritime environment and loading conditions encountered by large ore carriers are highly complex.It is a problem worth studying to scientifically describe the uncertain load of ore carriers and evaluate the safety margin of hull beams quantitatively.This paper investigated the stochastic characteristics of environmental loads and ship internal loads and explored methods for combining multiple loads and their nature mechanics.This research also revealed the still-water bending moment characteristics under typical loading conditions.WALCS hydrodynamic analysis software was used to calculate the wave load response function of the target ship.The extreme values of the wave bending moments were obtained using the extreme value type I(Gumbel type I)long-term forecasting method.The statistical characteristics of the wavebending moments were analyzed.Based on the uncertainty load combination method,the hull girder safety margin of the target ship was obtained as 1.10-1.20.The rationality of the load system specified in the CCS rules for ore carriers is further validated.The results show that the method can be applied to the formulation of relevant ore ship rules by CCS and effectively reveal the safety margins behind the rules.Understanding of the GBS-type ship rule has been enhanced.This research provides an important reference for the development of large ore carriers. 展开更多
关键词 uncertain load safety margin still-water bending moment wave bending moment ore carrier
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Distribution and sources of emerging and legacy perand polyfluoroalkyl substances(PFAS)in the East China Marginal Seas:Influence of terrestrial input and hydrography 认领 引用
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作者 Shiyue Li Chongtai Chen +6 位作者 Xinyan Cai Yuanjian Cao Jie Li Tian Lin Kevin C.Jones Guoping Gao Zhen Zhao 《Emerging Contaminants》 CSCD 2026年第2期30-41,共12页
The replacement of legacy PFAS by emerging alternatives is increasingly prevalent.Due to the unique geographical and complex hydrological conditions of marginal seas,investigating the environmental behaviors of both l... The replacement of legacy PFAS by emerging alternatives is increasingly prevalent.Due to the unique geographical and complex hydrological conditions of marginal seas,investigating the environmental behaviors of both legacy and emerging PFAS in these regions is necessary.In this study,seawater sampling was conducted in the East China Marginal Seas during 2020 and 2021.Among the 32 PFAS analyzed,8(2020)and 9(2021)were detected in over 30%of samples,with mean concentrations of 4.93±4.17 ng/L and 13.0±13.2 ng/L,respectively.Notably,hexafluoropropylene oxide trimer acid(HFPO-TA,5.02±4.95 ng/L)and perfluorooctanoic acid(PFOA,6.04±7.73 ng/L)had comparable concentrations and accounted for 39% and 46% of ΣPFAS,respectively,indicating an increasing substitution of legacy PFAS by emerging alternatives.The Yangtze River estuary showed a pronounced replacement of legacy PFAS by emerging alternatives.Coastal fluorochemical manufacturing and high-performance fluoropolymer use were identified as major drivers of compositional differences.Legacy PFAS showed nearshore retention,with their migration constrained by salinity fronts and water masses,whereas emerging PFAS displayed more complex behaviors,with some capable of crossing salinity fronts and undergoing long-range transport.Ecological risk assessment based on risk quotient(RQ)and hazard index(HI)further revealed spatially elevated risks in nearshore and estuarine zones,driven primarily by PFOA and HFPO-TA.Overall,spatial heterogeneity among marine regions reflects variations in industrial sources and usage patterns,underscoring the necessity of integrating regional industrial structures and pollution characteristics to strengthen ecological risk assessments. 展开更多
关键词 Emerging PFAS Marginal seas Spatial distribution Short-chain alternatives Environmental behavior
Tectonic deformation and its petroleum geological significance of continental margin necking zone in deepwater area of Pearl River Mouth Basin,South China Sea 认领 引用 被引量：1
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作者 PENG Guangrong CAI Guofu +4 位作者 LI Hongbo ZHANG Lili XIANG Xuhong ZHENG Jinyun LIU Baojun 《Petroleum Exploration and Development》 SCIE 2025年第4期937-951,共15页
Based on a set of high-resolution 3D seismic data from the northern continental margin of the South China Sea,the lithospheric structure,thinning mechanisms and related syn-rift tectonic deformation response processes... Based on a set of high-resolution 3D seismic data from the northern continental margin of the South China Sea,the lithospheric structure,thinning mechanisms and related syn-rift tectonic deformation response processes in the crustal necking zone in the deepwater area of the Pearl River Mouth Basin were systematically analyzed,and the petroleum geological significance was discussed.The necking zone investigated in the study is located in the Baiyun Sag and Kaiping Sag in the deepwater area of the Pearl River Mouth Basin.These areas show extreme crustal thinned geometries of central thinning and flank thickening,characterized by multi-level and multi-dipping detachment fault systems.The necking zone exhibits pronounced lateral heterogeneity in structural architectures,which can be classified into four types of thinned crustal architectures,i.e.the wedge-shaped extremely thinned crustal architecture in the Baiyun Main Sub-sag,dumbbell-shaped moderately thinned crustal architecture in the Baiyun West Sub-sag,box-shaped weakly thinned crustal architecture in eastern Baiyun Sag,and metamorphic core complex weakly thinned crustal architecture in the Kaiping Sag.This shows great variations in the degree and style of crustal thinning,types of detachment faults,distribution of syn-rift sedimentary sequences,and intensity of magmatism.The thinning of the necking zone is controlled by the heterogeneous rheological stratification of lithosphere,intensity of mantle-derived magmatism,and deformation modes of detachment faults.The syn-rift tectonic deformation of the necking zone evolved through three phases,i.e.uniform stretching during the early Wenchang Formation deposition period,necking during the late Wenchang Formation deposition period,and hyperextension during the Enping Formation deposition period.The crustal thinning extent and architectural differentiation in these phases were primarily controlled by three distinct mechanisms,i.e.the pure shear deformation activation of pre-existing thrust faults,the simple shear deformation of crust-mantle and inter-crust detachment faults,and differential coupling of lower crustal flow and ductile domes with main detachment faults.The hydrocarbon accumulation and enrichment in the necking zone exhibit marked spatial heterogeneity.Four distinct crustal thinned architecture-hydrocarbon accumulation models were identified in this study.The hydrocarbon accumulations in the shallow part exhibit significant correlations with their deep crustal thinned architectures.The unique lithospheric structure and deformation process predominantly control the favorable hydrocarbon accumulation zones with excellent source-fault-ridge-sand configurations,which is critical to reservoir-forming.The most promising exploration targets are mainly identified on the uplift zones and their seaward-dipping flanks associated with the middle and lower crustal domes.This research provides additional insights into lithospheric thinning-breakup process at intermediate continental margins of marine sedimentary basins,being significant for guiding the deepwater petroleum exploration in the Pearl River Mouth Basin. 展开更多
关键词 South China Sea Basin Pearl River Mouth Basin passive continental margin intermediate continental margin necking zone detachment fault hydrocarbon accumulation deepwater exploration
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Rift marginal coarse-grained sediment gravity flow deposits in the Eocene Dongying Depression,Bohai Bay Basin,China:Balancing tectonic and climatic controls 认领 引用 被引量：2
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作者 Rong-Heng Tian Ben-Zhong Xian +8 位作者 Peng Chen Lin Zhao Naveed Ur Rahman Muhammad Ubaid Umar Qian-Ran Wu Qian Li Wen-Miao Zhang Jian-Ping Liu Si-Rui Chen 《Petroleum Science》 SCIE EI CAS CSCD 2025年第8期3168-3188,共21页
Previous studies have indicated that sediment gravity flow deposits developed in lacustrine active extensional rift basins are primarily influenced by tectonics and to a lesser extent by climate.Our present work revea... Previous studies have indicated that sediment gravity flow deposits developed in lacustrine active extensional rift basins are primarily influenced by tectonics and to a lesser extent by climate.Our present work reveals that climate can obscure the effect of tectonic subsidence by regulating sediment supply;conversely,tectonics can impede the sedimentary manifestation of climatic impacts.Here a case study has been presented to assess the impact of climate-modulated rapid lake-level rise and tectonic subsidence on the development of coarse-grained gravity flow deposits in the Dongying rift margin of the Bohai Bay Basin,eastern China.The lithofacies analysis reveals frequent bed amalgamation,abundant thick massive coarse-grained deposits,widespread cross bedding and plant fragments,and incomplete composite bed formed by high-energy erosion,indicating that the hyperpycnal flow is an important mechanism driving the deposition of these coarse-grained sediments.Detailed sequence stratigraphic analysis and sediment dispersal pattern suggest that the long-striped nearshore subaqueous fan systems induced by outburst-flood hyperpycnal flow distributed along the border fault,are primarily controlled by long-term tectonics,while the rapid rise of lake level driven by short-term climate change possibly intensifies seasonal flood-generated hyperpycnal flow occurrences and consequently promotes the basinal fan progradation.The maximum scale of these coarse-grained gravity flow deposits of the basinal fan systems are typically attained during the transgressive systems tract,which deviates from the classical sequence stratigraphic model.Furthermore,it presented a continuous transition from the proximal to the distal part,encompassing traction flows and turbidity currents during the periods of relatively stable tectonics.Nevertheless,gravel-rich debris flows appear to predominate the dispersion of coarse-grained sediments during periods characterized by intense tectonic activity.The coarse-grained gravity flow deposits in the lacustrine rift margin reported here,challenge the traditional beliefs:this study suggests that subaqueous deposits abundantly preserved in the transgressive setting. 展开更多
关键词 Tectonic activity Climatic fluctuation Rift margin Gravity flow deposits
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Geometric Structural Characteristics and Tectonic Significance of the Litang Fault Zone,Southeastern Margin of the Tibetan Plateau 认领 引用 被引量：2
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作者 ZHANG Xianbing ZHONG Ning +2 位作者 YU Hao YU Xiao LI Haibing 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2025年第4期942-960,共19页
The Litang fault zone is an important seismogenic structure along the southeastern margin of the Tibetan Plateau.It caused the M71/4 earthquake in Litang in 1948 AD.The fault zone intersects the Sichuan-Xizang transpo... The Litang fault zone is an important seismogenic structure along the southeastern margin of the Tibetan Plateau.It caused the M71/4 earthquake in Litang in 1948 AD.The fault zone intersects the Sichuan-Xizang transportation corridor and poses a serious risk to its safe operation.This study,utilizing high-resolution remote sensing interpretation,field geological verification,UAV photogrammetry,UAV LiDAR,paleoearthquake trench excavation,and AMS14C and OSL dating methods,reveals the geometric structure,slip rates,paleoearthquake sequence,and earthquake rupture segmentation of the Litang fault zone;analyzes the rupture distribution range of the 1729 AD Litang earthquake and estimates its magnitude.The study indicates that the Litang fault zone is a relatively immature strike-slip fault,which has developed as a new active fault zone within the Northwestern Sichuan sub-block during the southeastward material migration of the southeastern margin of the Tibetan Plateau.This reflects a transformation in the deformation model of the Northwestern Sichuan sub-block crust from the‘Rigid Block’model to the‘Continuous Deformation’model. 展开更多
关键词 active block strike-slip fault deformation pattern Litang fault zone southeastern margin of the Tibetan Plateau
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The genetic mechanism of salt minerals in Fengcheng Formation in Hashan area,northwestern margin of Junggar Basin 认领 引用 被引量：1
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作者 Cun-Fei Ma Wen-Jun Huang +2 位作者 Jian Zhou Hong-Zhou Yu Mei-Yuan Song 《Petroleum Science》 SCIE EI CAS CSCD 2025年第10期3991-4014,共24页
The Fengcheng Formation in the Hashan area,located on the northwestern margin of the Junggar Basin,represents a saline-alkaline lake facies with fine-grained mixed sedimentation.This formation is rich in alkaline mine... The Fengcheng Formation in the Hashan area,located on the northwestern margin of the Junggar Basin,represents a saline-alkaline lake facies with fine-grained mixed sedimentation.This formation is rich in alkaline minerals and serves as a high-quality source rock for hydrocarbon generation in alkaline lakes.However,its lithology is complex,and the origins of the salt minerals remain unclear.This study focuses on the salt minerals in the Fengcheng Formation of the Hashan area.Using core observation,thin section identification,scanning electron microscopy,electron probe micro-analysis,trace and rare earth element analysis,stable isotope analysis,fluid inclusion analysis,and zircon U-Pb dating,the sedimentary age of Fengcheng Formation and the mineralogical and geochemical characteristics of salt minerals were systematically studied.The salt minerals identified in the Fengcheng Formation include calcite,dolomite,eitelite,northupite,shortite,reedmergnerite,and Na-carbonate.According to the different types of salt minerals,the different contact relations between minerals,the different production positions and production styles of mineral combinations,the salt mineral assemblage in the study area is classified into three categories:The combination of calcite,dolomite,shortite,and reedmergnerite,The combination of Na-carbonates,eitelite,shortite,and reedmergnerite,The combination of dolomite,eitelite,shortite,and northupite.Two zircon U-Pb ages,307.8±2.7 Ma and 308.5±3.5 Ma,span the Carboniferous-Permian boundary,corresponding to an interglacial period within the Late Paleozoic Ice Age,aligning with the development of salt minerals.Salt minerals have the formation modes of sedimentation,replacement and hydrothermal transformation.Terrestrial weathering products,atmosphe ric,volcanic and hydrothermal processes,residual seawater,clay mineral transformation,thermal evolution of organic matter and tuffaceous alteration are material sources.The salt-forming fluid has the characteristics of weak acid-alkaline,medium-low temperature and high salinity,and is mainly driven by subduction zone high pressure,magmatic heat and gravity.The burial depth,temperature and CO2concentration required for the formation of salt minerals were clarified,and the evolution sequence of salt-forming fluids from sedimentation to diagenesis and accompanied by hydrothermal(hot water)activities was summarized.The evolution model of salt minerals controlled by different genesis from the first member to the third member of Fengcheng Formation was established.The research findings are significant for understanding the paleoenvironment of the Fengcheng Formation,the formation mechanisms of high-salinity lakes,and the salt formation models. 展开更多
关键词 Northwestern margin of Junggar Basin Fengcheng Formation Salt minerals Genetic mechanism Evolution model
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Multi-detachment-controlled thrust structures and deep hydrocarbon exploration targets in southern margin of Junggar Basin,NW China 认领 引用 被引量：1
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作者 YU Baoli JIA Chengzao +6 位作者 LIU Keyu DENG Yong WANG Wei CHEN Peng LI Chao CHEN Jia GUO Boyang 《Petroleum Exploration and Development》 SCIE 2025年第3期663-679,共17页
For deep prospects in the foreland thrust belt,southern Junggar Basin,NW China,there are uncertainties in factors controlling the structural deformation,distribution of paleo-structures and detachment layers,and distr... For deep prospects in the foreland thrust belt,southern Junggar Basin,NW China,there are uncertainties in factors controlling the structural deformation,distribution of paleo-structures and detachment layers,and distribution of major hydrocarbon source rocks.Based on the latest 3D seismic,gravity-magnetic,and drilling data,together with the results of previous structural physical simulation and discrete element numerical simulation experiments,the spatial distribution of pre-existing paleo-structures and detachment layers in deep strata of southern Junggar Basin were systematically characterized,the structural deformation characteristics and formation mechanisms were analyzed,the distribution patterns of multiple hydrocarbon source rock suites were clarified,and hydrocarbon accumulation features in key zones were reassessed.The exploration targets in deep lower assemblages with possibility of breakthrough were expected.Key results are obtained in three aspects.First,structural deformation is controlled by two-stage paleo-structures and three detachment layers with distinct lateral variations:the Jurassic layer(moderate thickness,wide distribution),the Cretaceous layer(thickest but weak detachment),and the Paleogene layer(thin but long-distance lateral thrusting).Accordingly,a four-layer composite deformation sequence was identified,and the structural genetic model with paleo-bulge controlling zonation by segments laterally and multiple detachment layers controlling sequence vertically.Second,the Permian source rocks show a distribution pattern with narrow trough(west),multiple sags(central),and broad basin(east),which is depicted by combining high-precision gravity-magnetic data and time-frequency electromagnetic data for the first time,and the Jurassic source rocks feature thicker mudstones in the west and rich coals in the east according to the reassessment.Third,two petroleum systems and a four-layer composite hydrocarbon accumulation model are established depending on the structural deformation strength,trap effectiveness and source-trap configuration.The southern Junggar Basin is divided into three segments with ten zones,and a hierarchical exploration strategy is proposed for deep lower assemblages in this region,that is,focusing on five priority zones,expanding to three potential areas,and challenging two high-risk targets. 展开更多
关键词 southern margin of Junggar Basin foreland thrust belt trust structure detachment layer structural deformation mechanism structural evolution deep lower assemblages hydrocarbon accumulation deep hydrocarbon exploration target
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Quantum algorithm for marginal Fisher analysis 认领 引用
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作者 Jing Li Yanqi Song +2 位作者 Sujuan Qin Wenmin Li Fei Gao 《Chinese Physics B》 SCIE EI CAS CSCD 2025年第12期40-51,共12页
Marginal Fisher analysis(MFA)stands out as a prominent dimensionality reduction algorithm,striving to minimize within-class scatter while maximizing the separability between marginal data points.However,MFA and its va... Marginal Fisher analysis(MFA)stands out as a prominent dimensionality reduction algorithm,striving to minimize within-class scatter while maximizing the separability between marginal data points.However,MFA and its variants require substantial computational resources when dealing with large-scale data.To address this,we propose quantum algorithms for MFA(called QMFA).QMFA is composed of two core processes:the first is the efficient construction of the weight matrices for the intrinsic and penalty graphs,and the second is solving the generalized eigenvalue problem(GEP)using the block-encoding technique.Compared to classical MFA,the proposed QMFA achieves a polynomial acceleration in the number of samples and exponential acceleration in the dimensionality.Additionally,we investigate quantum algorithms for different variants of MFA.Specifically,for enhanced MFA and multiple MFA,we address the construction of the related weight matrix,which differs from that in standard MFA.For kernel MFA,we solve the GEP associated with the corresponding kernel matrix.The proposed quantum algorithms achieve a speedup equivalent to that of QMFA. 展开更多
关键词 quantum machine learning block-encoding dimensionality reduction marginal Fisher analysis graph construction
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Segmented evolution and exploration targets of the Cambrian platform margin in the Manxi area, Tarim Basin 认领 引用
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作者 Zongquan Hu Fan Feng +5 位作者 Chengming Fang Zicheng Cao Tieyi Wang Kangkang Guo Yang Li Shi Wang 《Energy Geoscience》 EI CAS CSCD 2025年第1期194-208,共15页
The Cambrian platform margin in the Tarim Basin boasts favorable source-reservoir-cap assemblages,making it a significant target for hydrocarbon exploration in ultra-to extra-deep facies-controlled for-mations.Of the ... The Cambrian platform margin in the Tarim Basin boasts favorable source-reservoir-cap assemblages,making it a significant target for hydrocarbon exploration in ultra-to extra-deep facies-controlled for-mations.Of the three major basins in western China,Tarim is the only basin with large-scale platform margin where no exploration breakthrough has been achieved yet.This study determines the vertical and lateral differential evolution of the platform margin(in the Manxi area hereafter referred to as the Cambrian Manxi platform margin)through fine-scale sequence stratigraphic division and a segmented analysis.The platform margin can be divided into the Yuqi,Tahe,Shunbei,and Gucheng segments,from north to south,based on the development of different ancient landforms and the evolutionary process of the platform.The Yuqi and Shunbei segments exhibit relatively low-elevation ancient landforms.Both segments were in a submarine buildup stage during the Early Cambrian,resulting in overall limited scales of their reservoirs.The Gucheng segment features the highest-elevation ancient landforms and accordingly limited accommodation spaces.As a result,the rapid lateral migration of high-energy facies zones leads to the development of large-scale reservoirs with only limited thicknesses.In contrast,the Tahe segment,exhibiting comparatively high-elevation ancient landforms,is identified as the most favorable segment for the formation of large-scale reservoirs.The cap rocks of the platform margin are dominated by back-reef dolomitic flats and tight carbonate rocks formed in transgressive periods.A comprehensive evaluation of source rocks,reservoirs,and cap rocks indicates that the Tahe segment boasts the optimal hydrocarbon accumulation conditions along the platform margin.In this segment,the Shayilike Formation transgressive deposits and the high-energy mound-shoal complexes along the platform margin of the Wusonggeer Formation constitute the optimal reservoir-cap rock assemblage,establishing this segment as the most promising target for hydrocarbon exploration in the platform margin. 展开更多
关键词 Tarim basin Cambrian Manxi platform margin Differential evolution Segmented characteristics
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Tracing molecular margins of lung cancer by internal extractive electrospray ionization mass spectrometry 认领 引用
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作者 Haiyan Lu Jiayue Ye +4 位作者 Yiping Wei Hua Zhang Konstantin Chingin Vladimir Frankevich Huanwen Chen 《Chinese Chemical Letters》 SCIE CAS CSCD 2025年第2期465-469,共5页
Accurate determination of lung cancer margins at the molecular level is of great significance to determine the optimal extent of resection during surgical operation and reduce the risk of postoperative recurrence.In t... Accurate determination of lung cancer margins at the molecular level is of great significance to determine the optimal extent of resection during surgical operation and reduce the risk of postoperative recurrence.In this study,internal extractive electrospray ionization mass spectrometry(i EESI-MS)was used to trace potential molecular tumor margins in lung cancer tissue.Molecular differential model for the determination of lung cancer tumor margin was established via partial least-squares discriminant analysis(PLS-DA)of iEESI-MS data collected from lung tissue pieces within cancer tumor area and iEESI-MS data collected from lung tissue pieces outside cancer tumor area.Proof-of-concept data demonstrate that the developed molecular differential model yields ca.1-2 mm wider potential molecular tumor margin of a lung cancer compared to the conventional histological analysis,showing promising potential of iEESI-MS to increase the accuracy of tumor margins determination and lower risk of lung cancer postoperative recurrence.Furthermore,our results revealed that creatine and taurine showed positive correlations with lung cancer. 展开更多
关键词 Lung cancer Tumor margins Internal extractive electrospray ionization Mouse models Postoperative recurrence
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Coal Measure Gas System of the Middle Jurassic Xishanyao Formation,Southern Margin of the Junggar Basin,China 认领 引用
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作者 Aobo Zhang Shida Chen +4 位作者 Dazhen Tang Shu Tao Shuling Tang Yifan Pu Taiyuan Zhang 《Journal of Earth Science》 SCIE CAS CSCD 2025年第5期2138-2160,共23页
The composition and sedimentary controlling effect of the coal measure gas-bearing(CMG)system of the Jurassic Xishanyao Formation in the southern margin of the Junggar Basin(SJB)are analysed based on core observations... The composition and sedimentary controlling effect of the coal measure gas-bearing(CMG)system of the Jurassic Xishanyao Formation in the southern margin of the Junggar Basin(SJB)are analysed based on core observations,sample tests,and logging data.The results show that the lithological associations of the SJB can be classified into 6 types based on sediment supply strengths and sealing abilities,while the gas shows of CMG reservoirs vary greatly among different lithological associations.Due to the diversified coal-forming environment and multistage coal accumulation,superimposed CMG systems are generally developed in the SJB,and their types include:superimposed unattached CMG systems,multilayer unified CMG systems,and superimposed mixed CMG systems.Furthermore,sedimentary controls on the vertical and regional distributions of different types of CMG systems are discussed according to the sedimentary facies of single wells and well cross-sections and the corresponding data of well log,gas logging,and gas contents.Shore shallow lake environments in the Fukang,Miquan,and northern Liuhuanggou areas were favourable for forming superimposed unattached CMG systems.Braided river environments in the Houxia and the southern Liuhuanggou areas usually formed multilayer unified CMG systems.Braided river delta environments in the Manasi,Hutubi,and eastern Sikeshu areas generally developed multilayer unified CMG systems and superimposed mixed CMG systems.For different types of superimposed CMG systems,the number of gas-bearing units,coal seam gas content,vertical hydraulic connectivity and lateral continuity vary considerably,which makes it necessary to tailor the CMG co-production plan to the type of CMG system. 展开更多
关键词 coal gas gas-bearing system sedimentary control gas-bearing characteristics southern margin of the Junggar Basin petroleum geology
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Deep-water Natural Gas Differential Migration and Enrichment in East African Transform Continental Marginal Basins 认领 引用
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作者 CAI Jun HE Youbin +1 位作者 LIANG Jianshe GUO Rong 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2025年第4期1105-1118,共14页
Compared to discrete continental marginal basins,the mechanisms of hydrocarbon migration and enrichment in transform continental marginal basins are poorly understood.In this study,we conducted a comprehensive analysi... Compared to discrete continental marginal basins,the mechanisms of hydrocarbon migration and enrichment in transform continental marginal basins are poorly understood.In this study,we conducted a comprehensive analysis of the main source rocks,reservoirs,and vertical migration pathways within the Rovuma(RB)and Tanzania(TB)basins in East Africa utilizing drilling,logging,seismic,and geochemical data.The results indicate that the enhanced preservation conditions of the Lower Jurassic source rocks in the southwest could lead to the discovery of large natural gas fields in the southern TB and RB.The primary reservoir is a deep-water turbidite sandstone.Due to topographic differences,the expanse of the turbidite sandstones in the RB is significantly larger than those in Tanzania.The main vertical migration pathways are the western boundary fault zone of the Kerimbas Graben(WBFZ)and the Seagap fault zone(SFZ).In the RB,natural gas migrates vertically along the WBFZ and preferentially accumulates in the deep-water turbidite sandstones of the footwall under the control of the fluid potential.Conversely,in the southern TB,the deep natural gas first migrates upward along the SFZ,then moves along the shallow branch faults in the sandstones on both sides of the SFZ. 展开更多
关键词 upstream exploration natural gas differential enrichment transform continental marginal basin fault activity deep-water Mozambique-Tanzania
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Lithium isotopes in the geothermal waters of the India–Asia continental convergent margin:Source and evolution 认领 引用
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作者 Yinlei Hao Hui Zhou +5 位作者 Xingxing Kuang Qinghua Gong Yuqing Feng Meizhuang Zhu Nianqing Li Xiaoyan Shi 《Geoscience Frontiers》 SCIE CAS CSCD 2025年第2期429-452,共24页
Lithium(Li)in geothermal waters along the India–Asia continental convergent margin is a potential Li resource and plays an important role in the Li budget and Li isotopic composition(δ7Li)of rivers and oceans.How... Lithium(Li)in geothermal waters along the India–Asia continental convergent margin is a potential Li resource and plays an important role in the Li budget and Li isotopic composition(δ7Li)of rivers and oceans.However,its origins and behavior remain unclear.Here,we systematically investigated theδ7Li,water(δ18O andδ2H)and helium(3He/4He)isotopes of 21 geothermal water samples as well as a series of shallow groundwater and river water samples from southern Tibet and the Himalayas.Theδ7Li values of geothermal waters vary from+1.0‰to+14.3‰and are negatively correlated with the Li concentration(0.006–35.0 mg/L).For geothermal water with Li concentrations>5 mg/L,Li is sourced mainly from magmatic fluids exsolving from granitic magma chambers in the crust rather than the mantle,with contributions of 49.5%±3.2%to 85.5%±1.0%.Theδ7Li values of these Li-rich geothermal waters are relatively homogeneous and comparable to those of bulk granitic rocks.They are mainly controlled by the Li isotopic compositions of granitic magmatic fluids(−2.6‰to+5.6‰),and the dissolution of primary minerals and the precipitation of secondary minerals with minimal Li isotopic fractionation during high-temperature(174±5℃ to 315±6℃)water–granite interactions at deep geothermal reservoirs(4.4–7.9 km).For geothermal waters with Li concentrations<5 mg/L,Li originates primarily from water–granitic rock interactions(dominated by biotite dissolution)at 106±3℃ to 207±10℃,contributing approximately 85%±16%of the total Li.An integrated dissolution–precipitation–mixing model suggests that highδ7Li values in Li-depleted samples result from preferential incorporation of 6Li into secondary minerals at lower reservoir temperatures within shallower reservoirs(2.7–5.2 km)and mixing of shallow groundwater during the ascent of geothermal waters.This study provides new insights into the fluid geochemistry of crustal granitic magma chambers and highlights that Li-rich geothermal waters in Tibet are controlled by the existence of crustal granitic magma chambers and the scale of faults. 展开更多
关键词 Geothermal waters Lithium isotopes Granitic magma chamber India–Asia continental convergent margin Water–rock interaction
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