Significant carbon isotope excursions in the Cambrian and their implications for global correlations

查看全文 作　　者：FAN [1,2,3]Ru;DENG [1,2,3]ShengHui;ZHANG [1]XueLei

机构地区：[1]Research Institute of Petroleum Exploration & Development, PetroChina, Beijing 100083, China;[2]State Key Laboratory of Enhanced Oil Recovery, Beijing 100083, China;;[3]Key Laboratory of OU and Gas Reservoir, CNPC, Beijing 100083, China

出　　处：《Science China Earth Sciences》索引2011年第54卷第11期,共10页

基　　金：supported by National Science and Technology Major Project (Grant No. 2008ZX05004);Major Project of China National Petroleum Corporation (Grant No. 2008E-0702) 摘　　要：The existing 13C data in the Cambrian from different regions of the world are analyzed here.There are four well-documented carbon isotope excursions with global significance.In ascending order,they are:(1) a large negative excursion,comparable to 'BACE' (BAsal Cambrian Carbon isotope Excursion) event,which occurs near the Precambrian-Cambrian boundary with a magnitude of 4‰-10‰ (PDB);(2) the 'ZHUCE' (ZHUjiaqing Carbon isotope Excursion) event,a distinct positive excursion (over 5‰) that can be recognized at the Fortunian Stage to Stage 2 transition;(3) another strong negative one,so-called 'ROECE' (Redlichiid-Olenellid Extinction Carbon isotope Excursion) event,shifting at the interval between Series 2 and Series 3,peaking at 3‰-5‰ (PDB);(4) the famous Steptoean positive carbon isotope excursion (SPICE),which has been widely identified at the base of Furongian Series,Paibian Stage,with an amplitude about 4‰ (PDB).The four sharp δ 13 C shifts correlate well with coeval paleoceanographic changes and bioevents.Besides,there are some 13 C excursions from a few sections in previous studies,and more data are required to identify whether they are global or regional ones. 关键词：碳同位素前寒武纪 SPICE 古气候变化 PDB 时间间隔寒武系事件

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Significant carbon isotope excursions in the Cambrian and their implications for global correlations

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