High-resolution paired carbon isotopic records from the Meishucun section in South China: Implications for carbon cycling and environmental changes during the Ediacaran-Cambrian transition
High-resolution paired carbon isotopic records from the Meishucun section in South China: Implications for carbon cycling and environmental changes during the Ediacaran-Cambrian transition
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华南梅树村剖面高分辨率配对碳同位素记录：埃迪卡拉纪-寒武纪过渡期间碳循环和环境变化的意义
DOI：
10.1016/j.precamres.2019.105561
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发表时间：
2020-02
影响因子：
3.8
通讯作者：
Dongping Hu
中科院分区：
文献类型：
--
作者：
Xiaolin Zhang;Xin Zhou;Dongping Hu
在埃迪卡拉-寒武纪（E-C）过渡期，碳同位素（δ 13 C）出现了几次显著的负偏移，反映了海洋-大气系统碳循环的大扰动。这些负δ 13 C偏移与剧烈的古环境变化有关，并被广泛用作区域和全球化学地层对比工具。然而，关于其原因和机制仍有许多争论。本文报道了中国南方梅树村剖面高分辨率碳酸盐（δ 13 Ccarb）和有机碳（δ 13 Corg）的δ 13 C记录。结合岩性变化和盆内对比，我们发现华南E-C转换期δ 13 C负漂移与海侵事件密切相关。分层海洋中存在较大的垂直（表层到深水）δ 13 C梯度，以及13 C耗尽的缺氧/缺氧深水沃茨通过化学跃层的上升流或变浅而间歇性侵入浅水环境，可能导致了这些负δ 13 C漂移。此外，在E-C转换过程中，δ 13 Corg垂直梯度的减小可能反映了深海的通气和氧化作用。含氧海底条件的相应扩张和动物可居住空间的大幅增加可能促进了寒武纪爆发期间后生动物的辐射。
Several prominent negative carbon isotope (δ13C) excursions are observed during the Ediacaran-Cambrian (E-C) transition, reflecting large perturbations of the carbon cycle in the ocean–atmosphere system. These negative δ13C excursions have been linked to dramatic paleoenvironmental changes and been widely used as regional and global chemostratigraphic correlation tools. However, there is still much debate about their causes and mechanisms. In this study, we report high-resolution δ13C records of both carbonate (δ13Ccarb) and organic carbon (δ13Corg) from the Meishucun section in South China. Combined with lithological variations and intrabasinal correlations, we find that the negative δ13C excursions during the E-C transition in South China are tightly linked with transgressive events. The existence of a large vertical (surface-to-deep water) δ13C gradient in a stratified ocean, and episodic incursions of 13C-depleted anoxic/euxinic deep waters into shallow water environment through enhanced upwelling or shoaling of the chemocline, may have contributed to these negative δ13C excursions. In addition, our results also imply a large reduction in the vertical δ13Corg gradient during the E-C transition, which may reflect the ventilation and oxygenation of the deep ocean. The corresponding expansion of oxic seafloor conditions and a large increase in the extent of habitable space for animals may have facilitated the radiation of metazoans during the Cambrian explosion.
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影响因子：
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影响因子：
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