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Geochemistry, Paleoenvironment and Mechanism of organic-matter Enrichment in the Lower Silurian Longmaxi Formation Shale in the Sichuan Basin, China

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Acta Geologica Sinica(English Edition) 2019年第3期93卷 505-519页

作者： CHEN Zhipeng CUI Junping REN Zhanli JIANG Shu LIANG Xing WANG Gaocheng ZOU Chen State Key Laboratory of Continental Dynamics of Ministry of Geology Northwest UniversityXi'an 710069ShaanxiChina Department of Geology Northwest UniversityXi'an 710069ShaanxiChina Petro China Zhejiang Oilfield Company Hangzhou310023ZhejiangChina Energy and Geoscience Institute University of UtahSalt Lake CityUT 84108USA State Key Laboratory of Sedimentary Basin and Energy Resources&Faculty of Earth Resources China University of GeosciencesWuhan 430074HubeiChina

To investigate the mechanism of the organic-matter enrichment in the Lower Longmaxi Formation shale,the geochemistry and total organic carbon(TOC)of the Longmaxi Formation black shales in the Jiaoshiba,Zhaotong,and Weiyuan areas of the Sichuan Basin were *** proxy parameters(Babio,Siex,and Ni/Al),clastic influx proxies(TiO2 and Ti/Al),redox indices(V/Cr,Ni/Co,V/(V+Ni),and U/Th),and hydrothermal indicators(Fe,Mn,and Y concentrations;Fe/Ti ratio and a Ni-Zn-Co diagram)were employed to decipher the paleoenvironment of the Lower Longmaxi Formation ***2 and Ti/Al indicated low terrigenous detrital influx in all three ***,Babio,Siex,and Ni/Al indicated high productivity in the Jiaoshiba area.V/Cr,Ni/Co,and U/Th indicated higher oxygen content with larger fluctuations in the Zhaotong and Weiyuan ***,Mn,and Y concentrations and the Fe/Ti ratio implied greater active hydrothermal activity in the Weiyuan *** heterogeneities were considered to be closely related to the paleoenvironment and paleogeography,and the large basement faults that developed during the Chuanzhong paleo-uplift could have provided vents for deep-hydrothermal-fluid *** redox indices(V/Cr,Ni/Co,and U/Th)and a paleoproductivity proxy(Ni/Al)displayed a significant correlation with the TOC,suggesting that both excellent preservation conditions and high paleoproductivity were the controlling factors for the enrichment of organic matter in the Longmaxi Formation *** was no obvious correlation between the clastic influx proxy(Ti/Al)and the TOC due to the extremely low supply of terrigenous *** hydrothermal indicator(Fe/Ti)was negatively correlated with the TOC in the Weiyuan area,indicating that hydrothermal activity may have played a negative role in the accumulation of organic *** study suggests that the enrichment of organic matter in the Longmaxi Formation marine shale varied according to the paleogeography and sedimentary en

关键词： geochemical index organic-matter enrichment paleogeography hydrothermal fluid Sichuan Basin

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Research on preservation and enrichment mechanisms of organic matter in muddy sediment and mudstone

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Science China Earth Sciences 2007年第5期50卷 765-775页

作者： CAI JinGong BAO YuJin YANG ShouYe WANG XingXin FAN DaiDu XU JinLi WANG AiPing State Key Laboratory of Marine Geology Tongji UniversityShanghai 200092China Institute of Earth Sciences Shengli Oil CompanyDongying 257015China

Using multidiscipline methodologies, the differences in preservation and enrichment mechanisms of organic matter (OM) in muddy sediment and mudstone are investigated. In clay fractions, concentrations of TOC and chloroform bitumen “A” are significantly higher than those in coarser fractions. This indicates that clay minerals (CM) play an important role in enriching OM. The content of chloroform bitumen “A” increases obviously in the clay fraction, which reveals that dissolvable OM is the main composition of coalesce with clay minerals. Furthermore, TG and DTA data show that OM enrichment mechanisms and preservation forms have multiplicity. Several exothermic peaks in the DTA curves demonstrate that muddy sediment and mudstone contain a number of bioclasts and amorphous OM besides dissolvable OM. Through analyzing with XRD and DTA after mudstone samples were pretreated, the conclusions can be arrived at. Firstly, CM interlayer space of XRD curves and exothermic peaks of DTA curves both change as temperature increases. Secondly, the changes of CM interlayer space and exothermic peaks are concordant and stable around 350°C. All these are the features that OM enters CM interlayers to form stable organo-clay complexes. Therefore, the combination format of OM with CM is not only surface adsorption, partial OM enters CM interlayers to form stable organo-clay complexes. Finally, through the research on OM preservation forms and enrichment mechanisms in muddy sediment and mudstone, the hydrocarbon-generation processes and the global carbon cycle and budget can be explained.

关键词： clay minerals dissoluble organic matter organo-clay complexes organic-matter enrichment mechanisms

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Beyond microbial carbon use efficiency

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National Science Review 2024年第04期11卷 33-35页

作者： Ke-Qing Xiao Chao Liang Zimeng Wang Jingjing Peng Yao Zhao Ming Zhang Mingyu Zhao Shuiqing Chen Yong-Guan Zhu Caroline L.Peacock State Key Lab of Urban and Regional Ecology Research Center for Eco-Environmental SciencesChinese Academy of Sciences University of Chinese Academy of Sciences Institute of Applied Ecology Chinese Academy of Sciences Department of Environmental Science and Engineering Fudan University College of Resources and Environmental Sciences China Agricultural University State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental Sciences State Key Laboratory of Agricultural Microbiology College of Resources and Environment Huazhong Agricultural University Key Laboratory of Cenozoic Geology and Environment Institute of Geology and Geophysics Chinese Academy of Sciences School of Earth and Environment University of Leeds

Microbial carbon use efficiency (CUE)is defined as the proportion of microbial biomass growth C versus substrate C uptake, and thus provides a useful measure of microbially driven accumulation and loss of soil organic carbon (SOC)[1]. In a recent study published in Nature [2],the authors used a data-driven machinelearning approach to conclude that CUE promotes global SOC storage based on a positive correlation between CUE and SOC content and that, based on sensitivity analysis, CUE is at least four times as important as six other evaluated factors,namely plant C inputs, C input allocation, non-microbial C transfer, substrate decomposability, environmental modifications and vertical transport.

关键词： SOIL-CARBON organic-matter

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Aggregate Stability and Its Relationship with Some Chemical Properties of Red Soils in Subtropical China

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Pedosphere 2005年第1期15卷 129-136页

作者： LIZhao-Xia CAIChong-Fa SHIZhi-Hua WANGTian-Wei CollegeofResourcesandEnvironment HuazhongAgriculturalUniversityWuhan430070China

The stability of aggregates in the surface soil is crucial to soil erosion and runoff generation. Thus, to understand the stability and the breakdown mechanisms of soil aggregates as well as the relationship between aggregate stability and selected soil chemical properties, such as different forms of Fe and Al oxides, organic matter, CEC and clay content, the aggregates of slightly and severely eroded red soils derived from Quaternary red clay in subtropical China were analyzed using the routine wet sieving…

关键词： organic-matter IRON-OXIDE INFILTRATION ERODIBILITY MECHANISMS BREAKDOWN ALUMINUM CLAY

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Soil Phosphorus Dynamics as Influenced by Land Use Changes in Humid Tropical, Southwest China

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Pedosphere 2005年第1期15卷 24-32页

作者： YANGJing-Cheng HUANGJian-Hui PANQing-Min TANGJian-Wei HANXing-Guo LaboratoryofQuantitativeVegetationEcology InstituteofBotanyChineseAcademyofSciencesBeijing1000g3China LaboratoryofQuantitativeVegetationEcology InstituteofBotanyChineseAcademyofSciencesBeijing1000g3China／／BeijingNaturalHistoryMuseumBeijing100050China XishuangbannaTropicalBotanicalGarden ChineseAcademyofSciencesYunnan666303China

Land use changes can greatly influence soil phosphorus (P) dynamics, especially when converting native forests to agricultural land. Soils in Xishuangbanna, which is one of southwest China s tropical areas that maintain fragments of primary forests, were studied to a) evaluate the effect of two common land use changes, conversion of forests to agricultural land or rubber tree plantation, on the dynamics of available P and total P in bulk soils as well as total P in particle size fractions; b) assess the rel…

关键词： BRAZILIAN AMAZON organic-matter NUTRIENT POOLS DEFORESTATION FRACTIONS PHOSPHATE BIOMASS LOSSES FIRE

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