Lower Carboniferous carbon isotope stratigraphy in South China: Implications for the Late Paleozoic glaciation

查看全文 作　　者：QIE [1]WenKun;ZHANG [1]XiongHua;DU [2]YuanSheng;ZHANG [2]Yang

机构地区：[1]State Key Laboratory of Geological Process and Mineral Resources, China University of Geosciences, Wuhan 430074, China;[2]Key Laboratory of Biogeology and Environmental Geology of Ministry of Education, China University of Geosciences, Wuhan 430074, China

出　　处：《Science China Earth Sciences》索引2011年第54卷第1期,共9页

基　　金：supported by MOST Special Fund from the State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences (Grant No. G0800-06-ZS-319) 摘　　要：Studies on carbon isotopes of bulk carbonates from Longan and Baping sections of Lower Carboniferous in Guangxi of China show that the stable carbon isotope compositions in carbonate rocks of the isolated platform and deep slope facies were resistant to the influence of early meteoric diagenesis and late burial diagenesis. Three major positive carbon isotope excursions have been recognized in Lower Carboniferous in South China. The first major positive δ13C shift of 4.19‰ occurred in the middle part of Siphonodella isosticha-upper Siphonodella crenulata zone (Tournaisian); the second with an amplitude of 4.65‰ occurred near the Tournaisian/Visean boundary; and the third of 2.23‰ in the lower part of Gnathodus bollandensis zone. The three positive shifts of δ13C can be correlated with global carbon isotope excursions and are consistent with the fall in global sea level, indicating that abundant organic carbon burial, lowering of atmospheric CO2, and glaciation may have occurred during these time intervals. 关键词：碳同位素冰川作用同位素地层学石炭纪晚古生代中国大气二氧化碳成岩作用

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Lower Carboniferous carbon isotope stratigraphy in South China: Implications for the Late Paleozoic glaciation

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