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Strong local, not global, controls on marine pyrite sulfur isotopes
Science Advances ( IF 13.6 ) Pub Date : 2021-02-26 , DOI: 10.1126/sciadv.abb7403
V. Pasquier 1 , R. N. Bryant 2, 3 , D. A. Fike 2 , I. Halevy 1
Affiliation  

Understanding variation in the sulfur isotopic composition of sedimentary pyrite (δ34Spyr) is motivated by the key role of sulfur biogeochemistry in regulating Earth’s surface oxidation state. Until recently, the impact of local depositional conditions on δ34Spyr has remained underappreciated, and stratigraphic variations in δ34Spyr were interpreted mostly to reflect global changes in biogeochemical cycling. We present two coeval δ34Spyr records from shelf and basin settings in a single sedimentary system. Despite their proximity and contemporaneous deposition, these two records preserve radically different geochemical signals. Swings of ~65‰ in shelf δ34Spyr track short-term variations in local sedimentation and are completely absent from the abyssal record. In contrast, a long-term ~30‰ decrease in abyssal δ34Spyr reflects regional changes in ocean circulation and/or sustained pyrite formation. These results highlight strong local controls on δ34Spyr, calling for reevaluation of the current practice of using δ34Spyr stratigraphic variations to infer global changes in Earth’s surface environment.



中文翻译:

对海洋黄铁矿硫同位素的强有力的局部而非全球性控制

在沉积黄铁矿(δ的硫同位素组成的变化的理解34小号PYR)由生物地球化学硫在调节地球表面的氧化态的重要作用激发。直到最近,当地的沉积条件对δ冲击34小号PYR一直怀才不遇,并在地层δ变化34小号PYR被解释主要反映在生物地球化学循环的全球变化。我们目前的两个同时代δ 34小号PYR在单个沉积系统中记录来自架子和盆地设置的信息。尽管它们接近并同时沉积,但这两个记录保留了根本不同的地球化学信号。在货架δ〜65的摆动‰ 34小号PYR在本地沉降轨道短期变化和来自深海记录完全不存在。相比之下,长期〜30‰下降深海δ 34小号反映在海洋环流区域变化和/或持续的黄铁矿的形成。这些结果显示了明显的局部控制器上δ 34小号PYR,要求使用δ的现行做法的重新评估34小号PYR 地层变化推断地球表面环境的整体变化。

更新日期:2021-02-28
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