A paired carbonate–organic δ13C approach to understanding the Cambrian Drumian carbon isotope excursion (DICE)
A paired carbonate–organic δ13C approach to understanding the Cambrian Drumian carbon isotope excursion (DICE)
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配对碳酸盐-有机 δ13C 方法来了解寒武纪 Drumian 碳同位素偏移 (DICE)
DOI：
10.1016/j.precamres.2019.105503
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发表时间：
2020-10
影响因子：
3.8
通讯作者：
Yanan Shen
中科院分区：
文献类型：
--
作者：
D;an Li;Xiaolin Zhang;Xu Zhang;Hao Zhu;Shanchi Peng;Lilin Sun;Yanan Shen
中寒武世（寒武纪系列3）德鲁姆期碳同位素偏移（DICE）代表了明显的负碳同位素偏移，并被提议作为识别寒武纪德鲁姆期基底和全球对比的关键化学地层标记。但DICE与华南地区的精确跨流域关联性尚未解决，DICE的驱动机制有待进一步了解。在这项研究中，我们报告了来自华南王村剖面的新配对δ13C碳带δ13Corg数据。两个 δ13Ccarband δ13Corg 剖面都在 P 的 FAD 附近捕获了大的负偏移 (DICE)。阿塔乌斯。我们认为，DICE 期间平行的 δ13Ccarband δ13Corg 负偏移可能是由于与海侵事件相关的缺氧深水浅滩造成的。海侵期间，深层缺氧水域向岸和向上侵入含氧较浅水体，可能会导致溶解有机碳（DOC）的氧化增强，并向地表水引入额外的 13 C 贫化碳，从而导致平行的 δ13C 碳带 δ13Corg 负偏移。更重要的是，我们使用箱模型来量化产生我们观察到的 DICE 的幅度和持续时间的碳同位素偏移所需的 DOC 氧化通量。模型结果表明，DICE过程中DOC的氧化可能需要大量氧化剂（即硫酸盐和氧气），可能导致浅海环境缺氧进一步扩大。我们认为，DICE 期间缺氧水的浅滩可能延迟了后生动物礁系统从早中寒武世大规模灭绝中的恢复。
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 δ13Ccarband δ13Corgdata from the Wangcun section in South China. Both δ13Ccarband δ13Corgprofiles capture a large negative excursion (DICE) near the FAD ofP. atavus. We suggest that the parallel δ13Ccarband δ13Corgnegative 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 additional13C-depleted carbon to the surface water, resulting in the parallel δ13Ccarband δ13Corgnegative 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.
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DOI：
10.1016/j.palaeo.2010.07.001
发表时间：
2010-10
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
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通讯作者：
R. Howley;G. Jiang
影响因子：
5.8
作者：
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DOI：
10.1016/j.palaeo.2006.11.010
发表时间：
2007-05
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
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通讯作者：
A. Riccardi;L. Kump;M. Arthur;S. D’Hondt
影响因子：
2.3
作者：
Luke E. Faggetter;P. Wignall;S. Pruss;Yadong Sun;R. Raine;R. Newton;M. Widdowson;M. Joachimski
通讯作者：
Luke E. Faggetter;P. Wignall;S. Pruss;Yadong Sun;R. Raine;R. Newton;M. Widdowson;M. Joachimski
DOI：
10.1016/b978-0-12-824360-2.00019-x
发表时间：
2020
期刊：
Geologic Time Scale 2020
影响因子：
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作者：
S. Peng;L. Babcock;P. Ahlberg
通讯作者：
S. Peng;L. Babcock;P. Ahlberg