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Zircon U-Pb ages of the volcanic rocks and their constraints on the ending of the Huoshiling Formation in the southeastern of Songliao Basin,NE China 认领 引用 被引量：1
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作者 Xue-jiao Qu Ming-kai Zhang +5 位作者 Pu-jun Wang Zhuo-long Yang You-feng Gao Kang-jun Wu Jia Wang Xian-feng Tan 《China Geology》 CAS CSCD 2026年第1期214-216,I0023,共3页
1.Objective The Songliao Basin(SB)is situated on the eastern margin of Eurasia continent(Northeast Asia).During the Late Jurassic to Early Cretaceous,hundreds of rifting basins developed in this area,and the SB is a u... 1.Objective The Songliao Basin(SB)is situated on the eastern margin of Eurasia continent(Northeast Asia).During the Late Jurassic to Early Cretaceous,hundreds of rifting basins developed in this area,and the SB is a unique case among them as it evolved into the largest rift basin.The rift basin filling of SB includes Huoshiling Formation,Shahezi Formation,and Yingcheng Formation in ascending order.The mega-rifting was controlled by the Mongol-Okhotsk Collisional Belt to the north and northwest and the Pacific Subduction Zone to the east(Wang PJ et al.,2016).As the first rifting succession,the Huoshiling Formation contains key information about the formation of the rifting basins and records the evolution of the Mongol-Okhotsk Collisional Belt and the Pacific Subduction Zone.However,the geological period of the Huoshiling Formation has not been well constrained for two main reasons.First,it is easily confused with the Yingcheng Formation,as both are dominated by volcanogenic-sedimentary successions.Second,there is lack of reliable dating samples from the uppermost part of the Huoshiling Formation due to its considerable burial depth. 展开更多
关键词 rift basin rift basinthe yingcheng formation zircon U Pb ages rifting basins volcanic rocks huoshiling formationshahezi formationand
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Magnetic fabric of the late Miocene extrusive rocks of the Combia Volcanic Province:Tectonic implications for the northern Andes 认领 引用 被引量：1
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作者 Victor A.Piedrahita Martin Chadima +3 位作者 Jackeline Ramírez Alejandra Tabares Maria I.Marín-Cerón JinHua Li 《Earth and Planetary Physics》 EI CSCD 2026年第1期44-56,共13页
The accretion of the Panama-ChocóBlock to the South American Plate partially drove the geological setting of the northern Andes.This event occurred in different collisional stages that are recorded in Oligocene-m... The accretion of the Panama-ChocóBlock to the South American Plate partially drove the geological setting of the northern Andes.This event occurred in different collisional stages that are recorded in Oligocene-middle Miocene deformed rocks of the inter-Andean valley between the Western and Central Cordilleras of Colombia.However,uncertainty remains about the age of the latest accretionary phases of the Panama-ChocóBlock.Poorly studied late Miocene volcanic rocks within the northern inter-Andean valley may provide key information to constrain the temporality of that final collision.Here,we study the deformational features of the~12-6 Ma extrusive rocks of the Combia Volcanic Province located in the northwestern Andes(Colombia).We present anisotropy of magnetic susceptibility(AMS)data for pyroclastic and volcanic rocks within the AmagáBasin,an inter-Andean depression with Oligocene-middle Miocene sedimentary rocks that recorded NW-SE compression and NE-SW simple shear caused by the Panama-ChocóBlock collision.We identified that the magnetic fabrics of the extrusive rocks of the Combia Volcanic Province reveal flow directions that indicate the occurrence of ancient volcanoes in the central axis of the AmagáBasin.Some of these fabrics do not contain any deformational features,whereas others record the same structural regime as the Oligocene-middle Miocene sedimentary rocks.We infer that variations in the intensity of the deformation promoted late Miocene local fault reactivations that,in contrast to the Oligocene-middle Miocene deformational events,did not affect the entire AmagáBasin.Age differences among the studied sections can also explain the different deformational patterns identified in the basin.Both interpretations suggest that the most significant collisional events of the Panama-ChocóBlock occurred in the Oligocene-middle Miocene,whereas the formation of the Combia Volcanic Province may have either followed or coincided with the latest stages of the accretion. 展开更多
关键词 Combia Volcanic Province Panama-ChocóBlock magnetic fabric deformation flow direction
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Characteristics of Early Jurassic Volcanic Rocks of the Erlanghe Formation in the Southern Zhangguangcai Range and their Response to Paleo-Pacific Plate Subduction 认领 引用
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作者 Yongjian Ren Xuefei Liu +5 位作者 Jing Zhang Shuo Cheng Chengxin Zhang Song Jin Liyong Gao Weisheng Zhang 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2026年第2期403-416,共14页
The main lithologies of the volcanic rocks in the Erlanghe Formation of the southern Zhangguangcai Range are andesite and rhyolite.Zircon laser ablation multi-collector inductively coupled plasma mass spectrometer(LA-... The main lithologies of the volcanic rocks in the Erlanghe Formation of the southern Zhangguangcai Range are andesite and rhyolite.Zircon laser ablation multi-collector inductively coupled plasma mass spectrometer(LA-MC-ICP-MS)isotopic dating yields weighted average ages of 190±2.8 and 187±1.7 Ma,indicating their formation during the Early Jurassic.The Erlanghe Formation volcanic rocks exhibit geochemical characteristics,including enrichment in large-ion lithophile elements(LILEs)and depletion in high-field-strength elements(HFSEs).In situ zircon Hf isotopic results show that andesite and rhyolite samples have consistent Hf isotopic compositions,with high positiveεHf(t)values(+6.5 to+9.6,+8.5 to+11.8)and similar two-stage model ages(TDM2=619-818 and 477-684 Ma).The intermediate volcanic rocks are derived from a depleted mantle source and formed by partial melting of the thickened lower crust—a process induced by the underplating of depleted mantle-derived magmas.In contrast,the felsic volcanic rocks form via partial melting of crustal materials.The discovery of the 190-187 Ma calc-alkaline volcanic assemblage reveals a compositional polarity of volcanic rocks along the transect from the continental margin to the continental interior.This finding provides reliable constraints on the initiation timing of Paleo-Pacific Plate subduction within the tectonic system of the southern Zhangguangcai Range. 展开更多
关键词 Early Jurassic Erlanghe Formation Paleo-Pacific Plate subduction volcanic rocks
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Genesis of Late Carboniferous volcanic rocks in the Kebai Fault Zone,Western Junggar,Xinjiang:Constraints from zircon U-Pb age,whole rock geochemistry,and Sr-Nd-Pb isotopes 认领 引用
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作者 Wei Wang Chuan-Yi Tang +6 位作者 Zong-Quan Yao Yan Gao Feng-Bin Han Zong-Rui Xie Jian Chen Yuan-Feng Yang Ya-Fang Zhang 《Petroleum Science》 SCIE EI CAS CSCD 2026年第2期712-729,共18页
The Late Paleozoic tectonic evolution of the Junggar Basin played a critical role in the formation of its oil and gas resources;however,as most of the basin is covered by desert,the evolutionary process remains contro... The Late Paleozoic tectonic evolution of the Junggar Basin played a critical role in the formation of its oil and gas resources;however,as most of the basin is covered by desert,the evolutionary process remains controversial.In this study,we present a comprehensive analysis of the rock associations,petrography,ages,and systematic elemental and isotopic compositions of Carboniferous volcanic rocks obtained from drilling holes along the western margin of the basin,aiming to better constrain the late Paleozoic tectonic evolution of this region.Two zircon samples,from tuff and andesite layers,yielded concordant ages of 316.8±1.7 and 321.7±1.8 Ma,respectively,indicating intense volcanic eruptions during the Late Carboniferous.The analyzed volcanic rocks exhibited sodic calc-alkaline affinities,with SiO2content ranging from 53.46 to 61.57 wt%,TiO2content from 0.75 to 1.20 wt%,and a significantly higher Na2O content than that of K2O.In terms of trace elements,they showed variable enrichment in light rare earth elements((La/Yb)N=2.72 to 7.89)and large ion lithophile elements such as Ba,Th,U,and Sr.Low Cr(0.67-65.72)and Ni(0.86-34.90)contents,together with significant negative Eu anomalies(δEu=0.17 to 0.35),suggest variable fractionation of the primitive magma prior to eruption.All these features,combined with prominent Nb-Ta depletions in PM-normalized incompatible element spider diagrams,unambiguously indicate their genetic relationship with a subduction environment.However,the volcanic rocks showed low initial(87Sr/86Sr)i values(0.7039-0.7057)and positiveεNd(t)values(7.5-8.0).Moreover,the combined(208Pb/204Pb)i ranged from 37.7295 to 37.7851,(207Pb/204Pb)i ranged from15.4935 to 15.5037,and(206Pb/204Pb)i ranged from 17.8910 to 17.9254,indicating that their primitive magma originated from an extremely depleted mantle source with crustal contamination.Integrating this study with regional geology,we propose that the volcanic rocks in the Kebai Fault Zone were most likely formed in a back-arc basin setting induced by ridge subduction. 展开更多
关键词 Western Junggar Kebai Fault Zone Volcanic rocks SHRIMP zircon U-Pb chronology Element/isotope geochemistry
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Reinterpretation of volcanic and hydrothermal influence on organic matter accumulation and paleo-depositional environment in a lacustrine shale system:Insight from interpretable machine learning model 认领 引用
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作者 Enze Wang Xiaoxiao Ma +7 位作者 Maowen Li Yingxiao Fu Menhui Qian Tingting Cao Zhiming Li Yue Feng Zhijun Jin Tong Li 《Petroleum Science》 SCIE EI CAS CSCD 2026年第6期3037-3058,共22页
The significant resource potential of lacustrine shale oil has spurred interest in understanding organic matter enrichment mechanisms.However,conventional analytical methods are often constrained by multicollinearity ... The significant resource potential of lacustrine shale oil has spurred interest in understanding organic matter enrichment mechanisms.However,conventional analytical methods are often constrained by multicollinearity and statistical limitations,hindering accurate identification of enrichment mechanisms under complex depositional conditions.Interpretable machine learning models present a viable alternative to address this issue.The 7th member of the Yanchang Formation(T3y7)is one of the key targets for lacustrine shale oil exploration and development in China.Nevertheless,the role of volcanic activity in organic matter accumulation within this unit remains controversial,hindering a comprehensive understanding of organic enrichment mechanisms in lacustrine systems.To address this challenge,this study integrates geochemical data from YYa borehole in the southern Ordos Basin and previously published datasets to reconstruct the paleoenvironmental settings of various lithofacies assemblages in the T3y7 shale.By leveraging published literature and new experimental data,this study develops an interpretable machine learning model based on random forest(RF),extreme gradient boosting(XGBoost),and support vector machine(SVM)to quantitatively determine the dominant controls on organic matter accumulation.Using the T3y7 shale as a case study,the influence mechanisms of both volcanic and hydrothermal activities on organic enrichment in lacustrine shale systems are further explored.Two distinct lithofacies assemblages were identified in the T3y7 shale:laminated black shale and massive dark-gray mudstone.These assemblages are characterized by significant differences in paleoclimate,salinity,redox conditions,primary productivity,terrigenous influx,and the intensity of volcanic and hydrothermal activities.Results from the interpretable machine learning model indicate that organic matter enrichment in the T3y7 shale is primarily governed by the coupling of high primary productivity and favorable preservation conditions,and decoupling of volcanic and hydrothermal activities was a significant factor in the development of different lithofacies in the T3y7.Importantly,the influence of volcanic activity on organic matter enrichment in lacustrine systems is nonlinear:while moderate volcanic activity promotes organic accumulation,intense volcanic activity tends to exert a detrimental effect.In contrast,hydrothermal activity appears to play a more consistently positive role in the formation of organic-rich shale in the T3y7.These findings highlight the need to distinguish between volcanic and hydrothermal processes in future studies in order to more obje ctive ly evaluate their respective impacts on organic-rich shale development in lacustrine settings.This study provide s a robust frame work for understanding the mechanisms of organic matter enrichment in shale deposited under complex geological conditions,and deepens our insight into the formation of organic-rich shale in lacustrine sedimentary systems influenced by volcanic and hydrothermal activity. 展开更多
关键词 Lacustrine shale Paleoenvironment reconstruction Interpretable machine leaning Volcanic and hydrothermal activity Organic matter enrichment mechanisms Ordos Basin
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Multi-method characterization of grain-size sensitive components in deep-sea sediments from the Zhongnan Seamount,South China Sea:implications for monsoon-volcanic interactions and turbidity current events 认领 引用
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作者 Yuanfu Yue Xintian Yu +2 位作者 Liuying He Xinmeng Yuan Kefu Yu 《Acta Oceanologica Sinica》 SCIE CAS CSCD 2026年第2期162-174,共13页
Grain-size sensitive component separation(GSCS)methods are pivotal for paleoenvironmental reconstruction but remain underexplored in tectonically active deep-sea seamount settings like the central South China Sea(SCS)... Grain-size sensitive component separation(GSCS)methods are pivotal for paleoenvironmental reconstruction but remain underexplored in tectonically active deep-sea seamount settings like the central South China Sea(SCS).This study presents the first systematic comparison of three GSCS techniques,namely standard deviation(STD),endmember modeling(EMM),and principal component analysis(PCA).These methods are applied specifically to sediment core GT-06 recovered from the Zhongnan Seamount in the central South China Sea.By integrating grain-size unmixing with complementary proxies,including magnetic susceptibility(MS)and loss on ignition(LOI),we assess the resolving power of each method and relate the resulting components to site-specific sedimentary processes(e.g.,summer monsoon,volcanic activity,seamount collapse-induced turbidity currents).Key results show that all methods identified three dominant grain-size ranges(clay,silt-sand,coarse sand)with robust inter-method correlations.Critically,EMM and PCA uniquely resolved a volcanic-derived silt component(EM2)that was undetectable using the STD method,highlighting a key limitation of STD in complex settings.Four geologically meaningful end-members were identified:(1)fine-grained terrigenous clay linked to the East Asian summer monsoon(EASM),(2)volcanic detritus reflecting Quaternary submarine eruptions,(3)siliceous biogenic debris indicative of monsoon-modulated productivity,and(4)coarse calcareous fragments associated with seamount collapse-induced turbidity currents.The results highlight the superior ability of EMM/PCA to resolve complex signals,whereas STD serves as an efficient yet limited tool for first-order screening.Together,these methods form a site-adapted framework for tectonically active deep-sea seamounts:EMM/PCA enabling fine-scale interpretation of monsoon-volcanic-turbidity interactions,and STD supports rapid large-dataset comparison.This workflow improves the reliability of paleoenvironmental reconstructions in mixed-signal settings like the Zhongnan Seamount. 展开更多
关键词 grain-size sensitive component separation South China Sea Zhongnan Seamount East Asian monsoon volcanic activity turbidity currents deep-sea sediments
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Genetic model of intraplate volcanic high-temperature geothermal system in Yanggao-Tianzhen Basin,Datong 认领 引用
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作者 Shaochuan Sun Xinwei Wang +3 位作者 Yanxin Wang Xiang Mao Jian Liu Lu Luo 《Energy Geoscience》 EI CAS CSCD 2026年第3期112-127,共16页
The Yanggao-Tianzhen Basin comprises three stratigraphic sequences from top to bottom,namely the Quaternary,Neogene-Paleogene,and Archean.The Quaternary serves as the regional caprock,and heat transfer within the basi... The Yanggao-Tianzhen Basin comprises three stratigraphic sequences from top to bottom,namely the Quaternary,Neogene-Paleogene,and Archean.The Quaternary serves as the regional caprock,and heat transfer within the basin occurs primarily via thermal conduction,with a higher geothermal gradient in the eastern part than in the west.Heat sources are distributed in the northern and eastern regions at a burial depth ranging from 4000 to 8000 m.Shallow-buried heat sources dominate the western part,while the eastern part features distinct magmatic channels connecting to shallow strata.The main fault system in the basin,trending NE-SW,provides pathways for deep heat sources.Unerupted concealed volcanic clusters are mainly distributed in the Yanggao area(central basin),consistent with the basin's structural strike;in contrast,concealed volcanic craters in the Tianzhen area are scattered in isolation,with visible magmatic channels.The hydrochemical type of shallow geothermal water is HCO3-Ca·Mg,while that of deep geothermal water is HCO3·Cl·SO4-Na.Geothermal water originates from atmospheric precipitation and exhibits poor circulation and renewal conditions.The formation and distribution of intraplate volcanic high-temperature geothermal resources are controlled by the combination of concealed volcanic distribution and deep/large faults.By characterizing the spatial structure of unerupted concealed volcanoes as well as the dynamic processes of heat conduction in the fault system and hydrothermal circulation,we propose a trinity genetic model of"magmatic heat source-structural conduction-shallow local thermal anomaly".Moreover,it is believed that the intraplate hightemperature geothermal system is activated and formed due to the long-range effect of plate subduction and collision caused by the"modification of supergene structures by deep processes". 展开更多
关键词 Datong volcanic group Yanggao-Tianzhen Basin Intraplate Concealed volcano Genetic model
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From rubble to reef:ecological transformation in volcanic rock-assisted coral restoration 认领 引用
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作者 Xiangbo LIU Ruimei CHEN +6 位作者 Xiaoyu LIN He ZHAO Junling ZHANG Wentao ZHU Yinyin ZHOU Aimin WANG Xiubao LI 《Journal of Oceanology and Limnology》 SCIE CAS CSCD 2026年第3期1074-1086,共13页
Coral reefs are increasingly degraded due to anthropogenic disturbance and climate change,transforming them into structurally unstable rubble fields that impede natural recovery and resilience.Under these conditions,t... Coral reefs are increasingly degraded due to anthropogenic disturbance and climate change,transforming them into structurally unstable rubble fields that impede natural recovery and resilience.Under these conditions,the likelihood of coral reef natural recovery declines significantly in the absence of human intervention.In 2017,we launched a restoration project by introducing 8 t of natural volcanic rock into a rubble field near Wuzhizhou Island,Sanya,Hainan Island,China.Comprehensive surveys were conducted in 2019 and 2023 to assess the long-term impacts of this intervention and verify the effectiveness of volcanic rocks in rubble field restoration.By 2023,the coral cover had increased to 27.4%in the restoration area,compared to just 10.2% in the control area.Additionally,the recruitment density of juvenile corals reached 8.33 inds./m2,which was nearly 7 inds./m2 higher than in the control area.The restoration area supported 28 fish species in density of 135.37 inds./100 m2,while the control area supported only 9 fish species in density of 20.5 inds./100 m2.Similarly,macroinvertebrate density was higher in the restoration area(0.59 inds./m2)than in the control area(0.29 inds./m2).These findings suggest that volcanic rocks offer an effective in situ substrate for coral larvae recruitment,enhancing the habitat structural complexity of rubble fields and promoting the aggregation of fish and macroinvertebrates. 展开更多
关键词 coral reef coral restoration coral community volcanic rock
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Study on prestack reservoir prediction of deep volcanic rock gas reservoirs in Chaganhua sub-sag of Songnan Fault Depression 认领 引用
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作者 Yang Qin-lin Fan Xue-pei +4 位作者 Bi Chen-chen Ke lan-mei Yang Ye Zhang Da Wang Shu 《Applied Geophysics》 SCIE CSCD 2026年第2期496-506,865,共11页
The deep Huoshiling Formation of Chaganhua Sub-sag in Songnan Fault Depression has developed intermediate-basic volcanic rocks,with complex lithology,significant difference in reservoir physical properties,strong hete... The deep Huoshiling Formation of Chaganhua Sub-sag in Songnan Fault Depression has developed intermediate-basic volcanic rocks,with complex lithology,significant difference in reservoir physical properties,strong heterogeneity,and the infl uence of low-velocity tuffi te.It is diffi cult to identify and predict the volcanic reservoir.In this paper,fi rst,we calculated diff erent mineral components of the volcanic rocks based on elemental capture spectroscopy logging and the normative mineral method.Taking the Xu-Panye rock physics model as the framework,the parameters of the physical model were optimized through error fusion and iteration,and a multi-mineral petrophysical model of volcanic rocks suitable for the study area was constructed.Sensitive elastic parameters for tuffi te and reservoirs identifi cation selected through petrophysical analysis.Then,based on pre-stack simultaneous inversion of wide-azimuth OVT gathers and Bayesian lithofacies probability analysis,different volcanic lithofacies bodies and reservoir probability bodies were obtained,thereby conducting quantitative prediction of volcanic reservoirs in the Huoshiling Formation of the study area.The reservoir results show a high degree of consistency with actual drilling data,achieving good practical application eff ects. 展开更多
关键词 Huoshiling Formation intermediate-basic volcanic rocks elemental capture spectroscopy logging normative mineral method pre-stack simultaneou inversion Bayesian lithofacies probability analysis
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Geomechanical Characterization of Volcanic Pyroclast Using Machine Learning 认领 引用
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作者 Miguel A.Millán Rubén Galindo Fausto Molina-Gómez 《Computer Modeling in Engineering & Sciences》 SCIE EI 2026年第6期506-531,共26页
Low-density volcanic rocks have specific geomechanical properties that require complex laboratory tests and characterization that are not usually available in common geotechnical studies.A pyroclastic rock behaves at ... Low-density volcanic rocks have specific geomechanical properties that require complex laboratory tests and characterization that are not usually available in common geotechnical studies.A pyroclastic rock behaves at sufficiently“low”stress levels as if it were a conventional rock under the action of an external load,but when subjected to higher stresses,the bonds between its particles can break,leading to a sudden decrease in its volume and the reorganization of its particles,thus forming a more compact structure than the initial one.This process is known as"mechanical collapse"and involves a drastic change in the properties,which is critical for engineering purposes.A compilation and analysis of many tests performed in our laboratory was conducted,considering several inputs such as origin rock block,lithotype class,dry density,particle density,porosity,failure stresses in Cambridge variables(p and q),deformation at failure(%),and isotropic collapse stress.The collapse stress is not available for all tests,then a reasonable prediction is made using the parabolic model of collapse.The objective of this research is to develop a machine learning procedure using this dataset to predict the isotropic collapse stress,which is challenging to measure in standard laboratory settings.This model will use a set of variables that can be easily obtained in the laboratory.Based on this evaluation,a technician can determine whether a complementary lab test is necessary or if failure is unavoidable within the given range of stresses.Two procedures were tested,XGBoost and artificial neural networks,both showing an outstanding prediction behavior. 展开更多
关键词 Pyroclast volcanic rock machine learning artificial neural networks XGBoost collapse
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Stratospheric transport and residence time of Hunga volcanic aerosol 认领 引用 被引量：1
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作者 Qing Zhao Xin Zhou 《Earth and Planetary Physics》 EI CSCD 2026年第1期167-175,共9页
The January 2022 eruption of Hunga injected unprecedented volumes of water vapor(150 Tg)and modest sulfur dioxide(SO2)into the stratosphere,producing accelerated sulfate aerosol formation in the early plume.As the ... The January 2022 eruption of Hunga injected unprecedented volumes of water vapor(150 Tg)and modest sulfur dioxide(SO2)into the stratosphere,producing accelerated sulfate aerosol formation in the early plume.As the aerosols gradually spread into the global stratosphere,the role of water vapor,among other factors in the spread and residence time of the sulfate aerosols,remained unclear.We used multisatellite observations to better understand the role of water vapor in the spread and lifetime of Hunga volcanic aerosols.Stratospheric circulation transported the plumes to~26 km within the polar vortices-the Antarctic by August 2022 and the Arctic by January 2023-with the arrival of aerosols lagging behind that of water vapor by months.Even though high injection altitudes(58 km)and strong Brewer-Dobson circulation contributed to prolonging the residence time of aerosols,the water vapor enhanced particle growth and thus accelerated gravitational settling,with the half lifetime of aerosols being 14 months.Our analysis revealed a critical trade-off:after the eruption of the Hunga volcano,an extremely high injection height and strong upward motion slowed the removal of aerosols,but extreme water vapor loading still had a certain impact on the half lifetime of the aerosols.These findings highlight the role of water vapor in the persistence of aerosols from submarine eruptions. 展开更多
关键词 stratosphere water vapor aerosol lifetime volcanic activity
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Chemical and mineral composition of altered volcanic ash in the Early Cretaceous coals of the Kharanorskoe deposit,Eastern Siberia,Russia 认领 引用
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作者 Alexey Vergunov Sergey Arbuzov +4 位作者 Aleksei Kholodov Andrey Novoselov Elena Deeva Sofia Shadrina Bakhtiyar Kenesbayev 《Acta Geochimica》 EI CAS CSCD 2026年第4期858-877,共20页
The paper presents data on the mineral and chemical composition of tonstein in the Early Cretaceous Novy-1a coal seam of the Kharanorskoe deposit located in the southeast of Eastern Siberia(Russia).The mineral composi... The paper presents data on the mineral and chemical composition of tonstein in the Early Cretaceous Novy-1a coal seam of the Kharanorskoe deposit located in the southeast of Eastern Siberia(Russia).The mineral composition of the tonstein is represented by kaolinite,quartz,and feldspar.Accessory minerals are zircon,ilmenite,monazite-(Ce),and xenotime-(Y).The tonstein is characterized by high concentrations of Ga,Nb,Hf,Ta,Hg,Th,and U.The highest concentrations of rare trace elements in the coal,and especially in the coal ash of the Novy-1a seam,are localized in the areas of contact between the tonstein and the coal.The enrichment with rare earth elements(REE)Zr,Nb,Y,Ta,Hf,Th,and U is the most significant.The range of elements and their concentration in the tonstein and in the coal ash at the contact with the interlayer confirm the conclusions about the nature and initial composition of the pyroclastics that formed the tonstein and indicate the important role of volcanism in the formation of geochemical specialization of coal deposits.Mineralogical and geochemical characteristics of the studied tonstein indicate its formation from volcanic ash of alkaline composition. 展开更多
关键词 Tonsteins Volcanic ash Early Cretaceous Eastern Siberia
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Brewing Prosperity A story of collaboration,from volcanic soil to global markets 认领 引用
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作者 Luo Chuanyu 《China Report ASEAN》 2026年第4期44-45,共2页
October 26,2025 was historic for the country lying at the southern tip of Southeast Asia.That day,Timor-Leste officially became the 11th member state of the Association of Southeast Asian Nations(ASEAN),marking the fi... October 26,2025 was historic for the country lying at the southern tip of Southeast Asia.That day,Timor-Leste officially became the 11th member state of the Association of Southeast Asian Nations(ASEAN),marking the first expansion of the regional organization in 26 years. 展开更多
关键词 association southeast asian nations asean marking expansion volcanic soil association southeast asian nations collaboration historic day global markets brewing prosperity
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Exploration breakthrough and hydrocarbon accumulation conditions of Mesozoic volcanic rocks in Bodong Low Uplift,Bohai Bay Basin,China 认领 引用 被引量：1
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作者 XU Changgui YANG Haifeng +3 位作者 CHEN Lei GAO Yanfei BU Shaofeng LI Qi 《Petroleum Exploration and Development》 SCIE 2025年第3期600-615,共16页
The Mesozoic volcanic rocks of the Bodong Low Uplift in the Bohai Bay Basin have been studied and explored for years.In 2024,the LK7-A well drilled in this region tested high-yield oil and gas flows from volcanic weat... The Mesozoic volcanic rocks of the Bodong Low Uplift in the Bohai Bay Basin have been studied and explored for years.In 2024,the LK7-A well drilled in this region tested high-yield oil and gas flows from volcanic weathered crust.These volcanic rocks need to be further investigated in terms of distribution patterns,conditions for forming high-quality reservoirs,and main factors controlling hydrocarbon accumulation.Based on the logging,geochemical and mineralogical data from wells newly drilled to the Mesozoic volcanic rocks in the basin,and high-resolution 3D seismic data,a comprehensive study was conducted for this area.The research findings are as follows.First,the volcanic rocks in the LK7-A structure are adakites with a large source area depth,and the deep and large faults have provided channels for the emplacement of intermediate-acidic volcanic rocks.Second,volcanic rock reservoirs are mainly distributed in tectonic breccias and intermediate-acidic lavas,and they are dominantly fractured-porous reservoirs,with high-porosity and low-permeability or medium-porosity and low-permeability.Third,the dominant lithologies/lithofacies is the basic condition for forming large-scale volcanic rock reservoirs.Structural fractures and late-stage strong weathering are crucial mechanisms for the formation scale of reservoirs in the Mesozoic volcanic rocks.Fourth,the Bodong Low Uplift exhibits strong hydrocarbon charging by two sags and overpressure mudstone capping,which are favorable for forming high-abundance oil and gas reservoirs.The Mesozoic volcanic buried hills in the study area reflect good trap geometry,providing favorable conditions for large-scale reservoir formation,and also excellent migration and accumulation conditions.Areas with long-term exposure of intermediate-acidic volcanic rocks,particularly in active structural regions,are the key targets for future exploration. 展开更多
关键词 offshore Bohai Bay Basin Bodong Low Uplift intermediate-acidic volcanic rock volcanic edifice weathering crust high-quality reservoir hydrocarbon accumulation overpressure intense charging exploration discovery
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Research on facies and reservoir seismic description methods of volcanic oil and gas reservoirs in Zhongguai area 认领 引用
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作者 YAN Qi HE Wenjun +6 位作者 BIAN Baoli AN Guoqiang LI Baobao BAI Yu YU Xing PANG Lei AN Zhiyuan 《Global Geology》 2026年第1期24-30,共7页
In recent years,significant breakthroughs have been achieved in the exploration of deep volcanic rocks in the Junggar Basin,highlighting their substantial exploration potential.The complex distribution of volcanic res... In recent years,significant breakthroughs have been achieved in the exploration of deep volcanic rocks in the Junggar Basin,highlighting their substantial exploration potential.The complex distribution of volcanic reservoirs is attributed to the multi-phase tectonic evolution within the basin,with their superior reservoir properties playing a crucial role in natural gas formation.However,due to the combined effects of multi-cyclic volcanic eruptions and tectonic activities,predicting volcanic facies distribution and favorable reservoirs remains highly challenging.This study focuses on the third member of the Jiamuhe Formation in the Zhongguai Uplift.By integrating drilling and petrophysical data with well-seismic analysis techniques,a seismic identification model for volcanic reservoirs has been established.The findings reveal that different facies exhibit distinct seismic response characteristics.Andesite,rhyolite,volcanic breccia,and volcanic clastic rocks show variability in amplitude,frequency,and continuity.Using structural-guided filtering,high-resolution coherence analysis,and 3D body carving techniques,the locations of volcanic craters and eruption centers were successfully identified,further clarifying the distribution patterns of volcanic facies.By combining multi-attribute clustering analysis and seismic attribute extraction,a volcanic facies zone distribution map was generated,and favorable exploration directions for volcanic reservoirs were proposed.The study provides technical guidance for the exploration of deep volcanic oil and gas reservoirs in the Junggar Basin and holds significant application value. 展开更多
关键词 Junggar Basin Favorable reservoir distribution Volcanics Timely window regularities of distribution
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Characteristics and distribution patterns of volcanic fractures in the Chaganhua Subsag of the Songliao Basin,China 认领 引用
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作者 Li Ning Shan Xuan-long +5 位作者 Yi Jian Li Zhong-bo Cao Kai-fang Tian Jun Shi Yun-qian Leng Qing-lei 《Applied Geophysics》 SCIE CSCD 2025年第4期1003-1018,1493,共16页
Fractures are critical control factors in volcanic reservoirs.Thus,studies on the prediction and distribution patterns of volcanic fractures are crucial for oil and gas exploration and development.Although considerabl... Fractures are critical control factors in volcanic reservoirs.Thus,studies on the prediction and distribution patterns of volcanic fractures are crucial for oil and gas exploration and development.Although considerable research has been conducted on volcanic fractures,targeted research on the spatial distribution patterns of fracture development remains limited in the literature.Two eruption modes,subaqueous eruption and subaerial eruption,have been identified in the Chaganhua subsag of the Songliao Basin,where gas resources have been discovered.Studying the differences in volcanic fracture development is highly important for understanding the law of oil and gas enrichment in volcanic reservoirs.On the basis of thin sections,cores,electrical imaging logs,and other data obtained from boreholes of subaqueous volcanic eruptions in the Songnan fault depression,we describe the characteristics of drilled fractures in detail and use 3D seismic data to extract intrinsic coherence,ant bodies,and Fourier series to extend the azimuthal anisotropic P-wave reflection coefficient,thereby predicting the spatial distribution of fractures at different scales.Moreover,through statistical analysis of quantitative evaluation indicators,such as fracture density and fracture development rate in different drilling wells,combined with the spatial distribution patterns of the predicted fractures,we compared and analyzed the relationships between the distributions of fractures and volcanic institutions,lithology,and volcanic facies.Results indicate that fractures are more developed in volcanic edifices located closer to faults.Considerable differences in fracture development are observed among lithofacies of volcanic rocks.Near faults,effusion facies,explosive facies and external clastic pyroclastic sedimentary subfacies are favorable for fracture development.This research provides a reference for investigating volcanic rock fractures of the same origins worldwide. 展开更多
关键词 Subaqueous eruption Chaganhua area Volcanic rock Fracture prediction Fourier series Volcanic facies Fracture density Fracture development rate
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Control of volcanic lithofacies on play fairways:A case study of the Huoshiling Formation in the Dehui faulted depression,southern Songliao Basin,China 认领 引用 被引量：3
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作者 Jijun Li Chenghong Luo +8 位作者 Tianhong Yang Tongyao Zhang Peng Hao Bo Wang Yan Cheng Libin Song Kexin Jia Lili Li Chao Liu 《Energy Geoscience》 EI CAS CSCD 2025年第2期155-173,共19页
Volcanic reservoirs demonstrate strong heterogeneity and substantial variations in productivity due to the complexity of volcanic eruption and lithology.The main types of reservoir space are not clear,and the dominant... Volcanic reservoirs demonstrate strong heterogeneity and substantial variations in productivity due to the complexity of volcanic eruption and lithology.The main types of reservoir space are not clear,and the dominant lithofacies distribution,particularly the favorable areas for high-quality reservoirs,remains to be determined.In this paper,the Huoshiling Formation in the Dehui faulted depression,Songliao Basin is taken as an example to carry out the multi-scale joint characterization of its pore throat structure,establish a reservoir evaluation standard that considers both the gas content and seepage capacity,and perform reservoir evaluation and play fairway mapping under facies control.The results show that the storage space types of the gas-bearing reservoirs in the faulted depression can be ascribed into three categories and six subcategories according to the pore throat and pore characteristics.In terms of pore sizes,volcaniclastic lava rank the first,followed by volcaniclastic rocks,sedimentary volcaniclastic rocks and volcanic lava.The comprehensive evaluation parameter(Φ·K·Sg,whereΦis porosity,K permeability,and Sggas saturation)of high-quality reservoirs are all greater than 0.1.The volcanic reservoirs in the Stage-III strata are the highest in quality and largest in area of play fairways.The thermal debris flow sub-facies developed at Stage III are mainly seen along the western strike-slip fault zone in the Debei sub-sag and the southwest Nong'an tectonic belt,while those developed at Stage I are distributed along the central and eastern fault zones in the southeastern Baojia sub-sag.The favorable layer evaluation and favorable area delineation under facies control will be of certain reference significance for subsequent exploration and development of volcanic gas reservoirs. 展开更多
关键词 Dehui faulted depression Volcanic rock Pore throat characteristics Reservoir evaluation Dominant lithofacies Play fairway
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Late Ordovician Volcanic Ash Deposition in the Southwestern Yangtze Shelf:Evidence for Arc Magmatism in the Wuyi-Yunkai Orogen 认领 引用
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作者 Jiaqiang Zhang Zhen Qiu +1 位作者 Weiliang Kong Wenjiao Xiao 《Journal of Earth Science》 SCIE CAS CSCD 2025年第6期2426-2436,共11页
The Ordovician-Silurian transition was marked by extensive volcanic activity globally.In South China,intensive volcanism was documented by abundant ash layers in strata,but the origins and tectonic settings of these a... The Ordovician-Silurian transition was marked by extensive volcanic activity globally.In South China,intensive volcanism was documented by abundant ash layers in strata,but the origins and tectonic settings of these ashes remain controversial.This study presents the stratigraphic distribution of volcanic ash layers,zircon trace element and Hf isotope data from the Wanhe Section in the southwestern Yangtze Shelf,providing insights into the tectonic setting and the origin of the parent magmas.The results suggest that volcanic ashes in the southwestern Yangtze Shelf primarily originated from arc magmatism in the Wuyi-Yunkai Orogen,with a mixed source from mantle and crust.The findings corroborate the hypothesis that the Late Ordovician–Silurian Wuyi-Yunkai Orogen in South China represents a collisional orogenic belt. 展开更多
关键词 Late Ordovician volcanic ash Wuyi-Yunkai Orogen South China geochemistry tectonics
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Late Jurassic tectono-volcanic evolution and sauropod radiation of eastern Jiangnan orogen:Evidence from Tunxi Formation,China 认领 引用
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作者 Xin-xin Ren Xu-ri Wang +1 位作者 Yi-chuan Liu Shu-bin Ju 《China Geology》 CAS CSCD 2025年第4期779-796,I0001,I0002,共18页
A prevailing theory suggests that volcanic eruptions triggered environmental changes,which compelled dinosaurs to migrate in search of new habitats.Compelling evidence for this hypothesis has now been discovered in th... A prevailing theory suggests that volcanic eruptions triggered environmental changes,which compelled dinosaurs to migrate in search of new habitats.Compelling evidence for this hypothesis has now been discovered in the Tunxi Basin of eastern China.During the Late Mesozoic,the subduction of the Pacific Plate beneath southeastern China led to multi-stage volcanic activity.The Tunxi Formation in the basin,the first reported Upper Jurassic volcanic unit in the eastern Jiangnan orogen.It overlies the stratum bearing the easternmost mamenchisaurids,which is the dominant Asian sauropod lineage.Geochemical analyses suggest its affinity with coeval magmatism in southeastern China,while new rhyolite zircon U-Pb dating yields an age of 151.6±2.2 Ma,further indicating a transition from arc magmatism to back-arc extension driven by Paleo-Pacific subduction during the Late Jurassic.These studies also confirm that,as early as 156 Ma,the Tunxi Basin was already a key habitat for mamenchisaurids.The Late Jurassic subduction of the Paleo-Pacific Plate caused extensive magmatism across eastern China.This intense tectonic shift likely induced abrupt environmental changes in relative basins.Severe volcanic activity drastically reduced the habitat of mamenchisaurids,prompting a northwestward and southward radiation trend-presents a coherent scene of volcanic eruptions,environmental catastrophe,and dinosaurs migrating. 展开更多
关键词 Sauropod dinosaur Mamenchisaurid Volcanic activity Dinosaur evolution radiation Subduction plate Tunxi Formation Eastern China
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Application of borehole images in the characterization of volcanic paleoenvironments with implications for the exploration of hydrocarbons in Brazilian basins 认领 引用
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作者 FORNERO S A MILLETT J M +4 位作者 DE JESUS C M DE LIMA E F MARINS G M PEREIRA N F BEVILAQUA L A 《Petroleum Exploration and Development》 SCIE 2025年第3期692-714,共23页
Conventional borehole image log interpretation of linear fractures on volcanic rocks,represented as sinusoids on unwrapped cylinder projections,is relatively straight-forward,however,interpreting non-linear rock struc... Conventional borehole image log interpretation of linear fractures on volcanic rocks,represented as sinusoids on unwrapped cylinder projections,is relatively straight-forward,however,interpreting non-linear rock structures and complex facies geometries can be more challenging.To characterize diverse volcanic paleoenvironments related to the formation of the South American continent,this study presents a new methodology based on image logs,petrography,seismic data,and outcrop analogues.The presented methodology used pseudo-boreholes images generated from outcrop photographs with typical igneous rock features worldwide simulating 2D unwrapped cylinder projections of a 31 cm(12.25 in)diameter well.These synthetic images and standard outcrop photographs were used to define morphological patterns of igneous structures and facies for comparison with wireline borehole image logs from subsurface volcanic and subvolcanic units,providing a“visual scale”for geological evaluation of volcanic facies,significantly enhancing the identification efficiency and reliability of complex geological structures.Our analysis focused on various scales of columnar jointing and pillow lava lobes with additional examples including pahoehoe lava,ignimbrite,hyaloclastite,and various intrusive features in Campos,Santos,and Parnaíba basins in Brazil.This approach increases confidence in the interpretation of subvolcanic,subaerial,and subaqueous deposits.The image log interpretation combined with regional geological knowledge has enabled paleoenvironmental insights into the rift magmatism system related to the breakup of Gondwana with associated implications for hydrocarbon exploration. 展开更多
关键词 borehole image log pseudo-image igneous rock hydrocarbon exploration lithofacies log interpretation volcanic paleoenvironment Santos Basin Campos Basin Parnaíba Basin
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