沉积沉积环境
黄铁矿
沉积岩
硫黄
冰期
环境化学
沉积物
地质学
稳定同位素比值
地球科学
环境科学
化学
地球化学
古生物学
物理
有机化学
构造盆地
量子力学
作者
Roger Bryant,Jennifer Houghton,Clive M. Jones,Virgil Pasquier,Itay Halevy,David A. Fike
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2023-11-24
卷期号:382 (6673): 912-915
被引量:3
标识
DOI:10.1126/science.adg6103
摘要
Reconstructions of past environmental conditions and biological activity are often based on bulk stable isotope proxies, which are inherently open to multiple interpretations. This is particularly true of the sulfur isotopic composition of sedimentary pyrite (δ34Spyr), which is used to reconstruct ocean-atmosphere oxidation state and track the evolution of several microbial metabolic pathways. We present a microanalytical approach to deconvolving the multiple signals that influence δ34Spyr, yielding both the unambiguous determination of microbial isotopic fractionation (εmic) and new information about depositional conditions. We applied this approach to recent glacial-interglacial sediments, which feature over 70‰ variations in bulk δ34Spyr across these environmental transitions. Despite profound environmental change, εmic remained essentially invariant throughout this interval and the observed range in δ34Spyr was instead driven by climate-induced variations in sedimentation.
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