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Global and regional controls on carbon-sulfur isotope cycling during SPICE event in south China

Frontiers of Earth Science 2023年第3期17卷 713-726页

作者： Xianfeng TAN Long LUO Hongjin CHEN Jon GLUYAS Zihu ZHANG Chensheng JIN Lidan LEI Jia WANG Qing CHEN Meng LI State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesWuhan 403374China Chongqing Key Laboratory of Complex Oil and Gas Exploration and Development Chongqing University of Science and TechnologyChongqing 401331China Shunan Gas Field PetroChina Southwest Oil and Gas Field CompanyLuzhou 646000China Department of Earth Sciences Durham UniversityDurhamDH13LEUK State Key Laboratory of Oil and Gas Reservior Geology and Exploration Chengdu University of TechnologyChengdu 610059China Yunnan Key Laboratory for Paleobiology Yunnan UniversityKunming 650091China School of Geographical Sciences Southwest UniversityChongqing 400715China

The positive S-isotopic excursion of carbonate-associated sulfate(δ34S_(CAS))is generally in phase with the Steptoean positive carbon isotope excursion(SPICE),which may reflect widespread,global,transient increases in the burial of organic carbon and pyrite sulfate in sediments deposited under large-scale anoxic and sulphidic ***,carbon-sulfur isotope cycling of the global SPICE event,which may be controlled by global and regional events,is still poorly understood,especially in south ***,theδ13CPDB,δ18OPDBδ34S_(CAS),total carbon(TC),total organic carbon(TOC)and total sulfate(TS)of Cambrian carbonate of Waergang section of Hunan Province were analyzed to unravel global and regional controls on carbon-sulfur cycling during SPICE event in south ***δ34S_(CAS)values in the onset and rising limb are not obviously higher than that in the preceding SPICE,meanwhile sulfate(δ34S_(CAS))isotope values increase slightly with increasingδ13CPDB in rising limb and near peak of SPICE(130–160 m).The sulfate(δ34S_(CAS))isotope values gradually decrease from 48.6‰to 18‰in the peak part of SPICE and even increase from 18%to 38.5%in the descending limb of *** abnormal asynchronous C−S isotope excursion during SPICE event in the south China was mainly controlled by the global events including sea level change and marine sulfate reduction,and it was also influenced by regional events such as enhanced siliciclastic provenance input(sulfate),weathering of a carbonate platform and sedimentary *** environment and lithology are not the main reason for global SPICE event but influence theδ13CPDB excursion-amplitude of *** level eustacy and carbonate platform weathering probably made a major contribution to theδ13CPDB excursion during the SPICE,in particularly,near peak of ***,the trilobite extinctions,anoxia,organic-matter burial and siliciclastic provenance input also play an important role in the onset,early and late st

关键词： sulfate isotope excursion terrigenous matter carbonate platform weathering sea level change transitional slope environment Waergang section

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