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Explanation for peat-forming environments of coal seam 2 and 9-2based on the maceral composition and aromatic compounds in the Xingtai coalfield,China 认领 引用 被引量：2
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作者 SUN Yu-zhuang QIN Shen-jun +2 位作者 LI Yan-heng LIN Ming-yue DING Shu-li 《Journal of Coal Science & Engineering(China)》 2009年第1期16-23,共8页
Maceral composition and aromatic compounds were determined on columnsamples to study the peat-forming environments of Permian coal seam 2 and Carboniferouscoal seam 9-2 from the Xingtai coalfield,China.The macerals... Maceral composition and aromatic compounds were determined on columnsamples to study the peat-forming environments of Permian coal seam 2 and Carboniferouscoal seam 9-2 from the Xingtai coalfield,China.The macerals were dominated by inertinitein seam 2 and by vitrinite in seam 9-2.Three maceral groups were selected as indicatorsof peat-forming environments.Two triangle diagrams were drawn based on the indicatorsto explicate the peat-forming environments of permian seam 2 and Carboniferousseam 9-2.The results indicate that the peat of carboniferous seam 9-2 formed dominantlyin wet swamps,whereas the peat of Permian seam 2 formed dominantly in dry swampsand open moor environments. 展开更多
关键词 Xingtai coalfield maceral composition aromatic compounds peat-forming environments Permian Carboniferous
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Study on Peat-Forming Mechanism of Tropic and Sub-TropicTidal Flats 认领 引用
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作者 桑树勋 刘焕杰 施健 《International Journal of Mining Science and Technology》 CAS 1997年第2期51-55,共5页
Tropic and sub-tropic tidal flats (generalised) are a kind of speific peat-forming environments. Taking the Mangrove tidal flats and mangrove pets in Hainan island as a example, the authors deeply study and discuss th... Tropic and sub-tropic tidal flats (generalised) are a kind of speific peat-forming environments. Taking the Mangrove tidal flats and mangrove pets in Hainan island as a example, the authors deeply study and discuss the peat-forming mechanism of tropic and sub-tropic tidal flats. The conclusions are as follows: intrusion accretiou of plant organic matter is more important ; the organic matter has accumulated witk high productivity, high return rate and high decompeition rate ;anaerobic bacterin play a more important role during early peatification ; sea level change is the fundameutal factor controlling the formation and evolution of tidal flat peat-forming environments; lagoon peat-flat and delta peat-flat are main types of tidal flat peat-forming euvironments ;tidal flat peat-forming environments are remarkably characterized by low-level and rabe properties. 展开更多
关键词 mangrove tidal flat mangrove peat peat-forming mechanism tropic and subtropic zones
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Seasonal variations of leaf wax n-alkane distributions and δ2 H values in peat-forming vascular plants from the Dajiuhu peatland, central China 认领 引用 被引量：1
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作者 Jiantao XUE Xueying ZHANG +2 位作者 Jinzhi LI Zhiqi ZHANG Huaiying YAO 《Frontiers of Earth Science》 SCIE CSCD 2022年第3期774-785,共12页
Leaf wax n-alkane compositions have been widely applied to reconstruct paleoclimate histories in peat deposits,yet understanding of how the n-alkanes vary during seasonal plant growth remains limited.Here we report va... Leaf wax n-alkane compositions have been widely applied to reconstruct paleoclimate histories in peat deposits,yet understanding of how the n-alkanes vary during seasonal plant growth remains limited.Here we report variations in the molecular and wax-derived nalkane hydrogen isotope(δ2 Halk)in the three dominant vascular plant species(Sanguisorba officinalis,Carex argyi,Euphorbia esula)and surface peat deposits nearby from the Dajiuhu peatland over a growing season.All three species show a relatively high carbon preference index(CPI)in the beginning of the growing season,with the CPI values reaching as high as 50 in two of the three species.Two species(S.officinalis,E.esula)display relatively stable average chain length(ACL)values over the four sampling intervals,with standard derivations of 0.2-0.3.In contrast,C.argyi exhibits a significant fluctuation of ACL values(averaging 28.11.4)over the growing season.Theδ2 Halk in all three species decreased during leaf growth.In the final stage of growth,theδ2 Halk values of the three species are similar to those in the surface peats collected from the peatland.Combining the results of our measurements of alkane concentration andδ2 H values,it is likely that de novo synthesis of leaf wax n-alkanes in the peatforming plant species is mainly at the early stage of leaf development.In the following months,the removal process exceeds renewal,resulting in a general decrease of the concentration of the total n-alkanes and the integratedδ2 Halk values.Thus theδ2 Halk values probably integrate the environmental variations at the end of the plant growth period rather than the whole period or the early growth period.These results are significant and have the potential to improve the utility ofδ2 Halk values in paleoenvironmental reconstructions. 展开更多
关键词 peat-forming vascular plants n-alkanes δ2H ratio seasonal variations central China
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