Insights Into the Terminal Ediacaran Marine Carbonate Record From Shale-Hosted Carbonate Carbon Isotopes
Insights Into the Terminal Ediacaran Marine Carbonate Record From Shale-Hosted Carbonate Carbon Isotopes
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从页岩碳酸盐碳同位素深入了解埃迪卡拉纪末期海洋碳酸盐记录
DOI：
10.2475/001c.88082
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发表时间：
2023-11
影响因子：
2.9
通讯作者：
F. Bowyer;Mariana Yilales;Rachel Wood;S. Poulton
中科院分区：
文献类型：
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作者：
F. Bowyer;Mariana Yilales;Rachel Wood;S. Poulton
用于化学地层学和碳循环动力学重建的海洋碳同位素记录 (δ13C) 通常是使用碳酸盐岩来组装的。然而，有证据表明，在某些环境下，细粒碎屑岩（页岩和泥岩）中存在的碳酸盐胶结物也可能表现出与碳酸盐记录一致的 δ13C 趋势。我们提出了页岩碳酸盐胶结物（本文称为 δ13Ccarb-sh 和 δ18Ocarb-sh，n = 107, 0.4）的新碳和氧同位素数据，可以近似开放海洋混合碳酸盐-碎屑岩环境中的同期 δ13Ccarb。相比之下，区域和全球 δ13Ccarb 记录具有低 CaCO3/TOC (532 Ma) 的样品中的 δ13Ccarb-sh 值。
The marine carbon isotope record (δ13C) used for chemostratigraphy and reconstruction of carbon cycle dynamics is commonly assembled using carbonate rocks. There is, however, evidence that carbonate cements hosted within fine-grained clastics (shales and mudstones) in some settings may also express δ13C trends that covary with the record from carbonates. We present new carbon and oxygen isotopic data from shale-hosted carbonate cements (herein termed δ13Ccarb-sh and δ18Ocarb-sh, n = 107, 0.4) can approximate contemporaneous δ13Ccarb in open marine mixed carbonate-clastic settings. By contrast, δ13Ccarb-sh values in samples with low CaCO3/TOC (532 Ma) regional and global δ13Ccarb records.