The sulfur isotopic composition of Cenozoic pyrite is affected by methane content and depositional environment

IF 4.8 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Earth and Planetary Science Letters Pub Date : 2024-10-30 DOI:10.1016/j.epsl.2024.119097

C. Spruzen , H.J. Bradbury , E.R. Kast , A.V. Turchyn

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引用次数: 0

Abstract

The sulfur isotopic composition of pyrite (δ³⁴S_pyr) is often used to reconstruct ancient geobiological processes, but recent studies have shown that δ³⁴S_pyr is strongly dependent on local sedimentary environmental conditions. Here we present a global compilation of >3700 published pyrite sulfur isotopic compositions from the past 165 million years, from outcrop as well as marine sediment cores. We show that sediment core δ³⁴S_pyr has a statistically significant relationship with methane content, sedimentation rate, lithology, and proximity from shore, while outcrop δ³⁴S_pyr has distinct distributions depending on categories of depositional water depth and lithology. There are no obvious trends in the average δ³⁴S_pyr from the late Mesozoic to the present, although we suggest that this temporal record is affected by the inherent bias of data compilation. Our study further emphasizes the importance of considering sedimentology and stratigraphic context when using the sulfur isotopic composition of pyrite to infer global environmental changes.

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新生代黄铁矿的硫同位素组成受甲烷含量和沉积环境的影响

黄铁矿的硫同位素组成（δ34Spyr）经常被用来重建古代地球生物过程，但最近的研究表明，δ34Spyr在很大程度上取决于当地的沉积环境条件。在此，我们对过去 1.65 亿年中已发表的 3700 个黄铁矿硫同位素组成进行了全球汇编，这些同位素来自露头和海洋沉积岩芯。我们的研究表明，沉积岩芯的δ34Spyr与甲烷含量、沉积速率、岩性和距离海岸的远近有显著的统计学关系，而露头δ34Spyr则因沉积水深和岩性的不同而有不同的分布。从中生代晚期到现在，平均 δ34Spyr 没有明显的变化趋势，尽管我们认为这种时间记录受到了数据汇编固有偏差的影响。我们的研究进一步强调了利用黄铁矿的硫同位素组成推断全球环境变化时考虑沉积学和地层背景的重要性。

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来源期刊

Earth and Planetary Science Letters 地学-地球化学与地球物理

CiteScore

10.30

自引率

5.70%

发文量

475

审稿时长

2.8 months

期刊介绍： Earth and Planetary Science Letters (EPSL) is a leading journal for researchers across the entire Earth and planetary sciences community. It publishes concise, exciting, high-impact articles ("Letters") of broad interest. Its focus is on physical and chemical processes, the evolution and general properties of the Earth and planets - from their deep interiors to their atmospheres. EPSL also includes a Frontiers section, featuring invited high-profile synthesis articles by leading experts on timely topics to bring cutting-edge research to the wider community.