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A paired carbonate-organic delta C-13 approach to understanding the Cambrian Drumian carbon isotope excursion (DICE)
Li, Dandan1; Zhang, Xiaolin1; Zhang, Xu1; Zhu, Hao1; Peng, Shanchi2; Sun, Lilin1; Shen, Yanan1
2020-10-01
发表期刊PRECAMBRIAN RESEARCH
ISSN0301-9268
卷号349页码:13
摘要

The middle Cambrian (Cambrian Series 3) Drumian carbon isotope excursion (DICE) represents a pronounced negative carbon isotopic excursion, and has been proposed as a key chemostratigraphic marker for identifying the base of Cambrian Drumian Stage and global correlation. However, the precise interbasinal correlation of the DICE to the South China remains unsolved and the driving mechanism of the DICE is to be further understood. In this study, we report new paired delta(13)C(carb )and delta C-13(org), data from the Wangcun section in South China. Both delta C-13(carb) and delta C-13(org), profiles capture a large negative excursion (DICE) near the FAD of P. atavus. We suggest that the parallel delta C-13(carb) and delta C-13(org), negative excursions during the DICE may have resulted from the shoaling of anoxic deep waters associated with the transgressive event. Shoreward and upward incursion of deep anoxic waters into oxygenated shallower water column during transgression could lead to the enhanced oxidation of dissolved organic carbon (DOC) and introduce additional C-13-depleted carbon to the surface water, resulting in the parallel delta C-13(carb) and delta C-13(org) negative excursions. More importantly, we use a box model to quantify the flux of DOC oxidation needed to produce a carbon isotope excursion of the magnitude and duration of the DICE we observed. The model results indicate that oxidation of DOC during the DICE may require massive amounts of oxidants (i.e., sulfate and oxygen), probably causing further expansion of anoxia in the shallow marine environment. We suggest that shoaling of anoxic water during the DICE could have delayed the recovery of metazoan reef systems from the early-middle Cambrian mass extinctions.

关键词Carbon isotope DICE Cambrian Series 3 Oceanic anoxia South China
DOI10.1016/j.precamres.2019.105503
收录类别SCI
语种英语
关键词[WOS]BOUNDARY STRATOTYPE SECTION ; LARGE IGNEOUS PROVINCES ; SOUTH CHINA ; POINT GSSP ; C-ISOTOPE ; CHEMOSTRATIGRAPHY ; EXTINCTION ; EVOLUTION ; SEAWATER ; RECORD
资助项目National Natural Science Foundation of China[41890842] ; National Natural Science Foundation of China[41721002] ; National Natural Science Foundation of China[41520104007] ; National Natural Science Foundation of China[41807315] ; National Natural Science Foundation of China[41673003] ; National Natural Science Foundation of China[41625013] ; National Basic Research Program of China[2013CB835003] ; 111 project[B14026] ; Chinese Academy of Sciences[QYZDY-SSW-DQC031] ; Fundamental Research Funds for the Central Universities ; State Key Laboratory of Palaeobiology and Stratigraphy[20191101]
WOS研究方向Geology
WOS类目Geosciences, Multidisciplinary
WOS记录号WOS:000589422300013
项目资助者National Natural Science Foundation of China ; National Basic Research Program of China ; 111 project ; Chinese Academy of Sciences ; Fundamental Research Funds for the Central Universities ; State Key Laboratory of Palaeobiology and Stratigraphy
出版者ELSEVIER
文献类型期刊论文
条目标识符http://ir.nigpas.ac.cn/handle/332004/37608
专题中国科学院南京地质古生物研究所
通讯作者Li, Dandan; Zhang, Xiaolin
作者单位1.Univ Sci & Technol China, Sch Earth & Space Sci, Hefei 230026, Peoples R China
2.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China
推荐引用方式
GB/T 7714
Li, Dandan,Zhang, Xiaolin,Zhang, Xu,et al. A paired carbonate-organic delta C-13 approach to understanding the Cambrian Drumian carbon isotope excursion (DICE)[J]. PRECAMBRIAN RESEARCH,2020,349:13.
APA Li, Dandan.,Zhang, Xiaolin.,Zhang, Xu.,Zhu, Hao.,Peng, Shanchi.,...&Shen, Yanan.(2020).A paired carbonate-organic delta C-13 approach to understanding the Cambrian Drumian carbon isotope excursion (DICE).PRECAMBRIAN RESEARCH,349,13.
MLA Li, Dandan,et al."A paired carbonate-organic delta C-13 approach to understanding the Cambrian Drumian carbon isotope excursion (DICE)".PRECAMBRIAN RESEARCH 349(2020):13.
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