当前位置: X-MOL 学术Chem. Geol. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Possible triggers of the seawater sulfate S-isotope increase between 55 and 40 million years ago
Chemical Geology ( IF 3.6 ) Pub Date : 2020-10-01 , DOI: 10.1016/j.chemgeo.2020.119788
Weiqi Yao , Adina Paytan

Abstract The Earth system experienced a climatic transition from a greenhouse state to an icehouse state over the Cenozoic, which may have been induced by tectonic and orbital processes. This transition has triggered many environmental changes including fluctuations in sea levels, seawater chemistry, and biogeochemical cycles of carbon, sulfur, and other elements. Owing to a better-resolved biostratigraphic framework and analytical techniques, high temporal resolution seawater sulfate S-isotope data (δ34Ssw) have become available through the analysis of marine barite and carbonate associated sulfate (CAS). These data provide new insight into changes in global biogeochemical cycles over this time interval and their potential causes. This study presents a review of recent work on the δ34Ssw for the past 65 million years, with a focus on the most salient perturbation of the Cenozoic sulfur cycle, a 5‰ rise over a 15-million-year period in the early-middle Eocene. We discuss the possible causes suggested to date for the δ34Ssw excursion, which include changes in the magnitude, location, or fractionation associated with pyrite formation and burial, changes to the input of sulfate to the ocean, and changes in ocean circulation. We suggest how some new geochemical data and models can improve our understanding of the various Earth's surface processes that affect the global sulfur cycle and outline a framework for interpreting other geologic intervals where δ34Ssw has fluctuated.

中文翻译:

55 到 4000 万年前海水硫酸盐 S 同位素增加的可能触发因素

摘要 地球系统在新生代经历了从温室状态到冰库状态的气候转变,这可能是由构造和轨道过程引起的。这种转变引发了许多环境变化,包括海平面的波动、海水化学以及碳、硫和其他元素的生物地球化学循环。由于更好解析的生物地层框架和分析技术,通过对海洋重晶石和碳酸盐伴生硫酸盐 (CAS) 的分析,可以获得高时间分辨率的海水硫酸盐 S 同位素数据 (δ34Ssw)。这些数据为了解此时间间隔内全球生物地球化学循环的变化及其潜在原因提供了新的见解。这项研究回顾了过去 6500 万年来 δ34Ssw 的最新工作,重点关注新生代硫循环中最显着的扰动,在始新世中早期的 1500 万年期间上升了 5‰。我们讨论了迄今为止建议的 δ34Ssw 偏移的可能原因,其中包括与黄铁矿形成和埋藏相关的量级、位置或分馏的变化,硫酸盐进入海洋的变化,以及海洋环流的变化。我们建议一些新的地球化学数据和模型可以如何提高我们对影响全球硫循环的各种地球表面过程的理解,并勾勒出解释 δ34Ssw 波动的其他地质区间的框架。其中包括与黄铁矿形成和埋藏相关的数量、位置或分馏的变化,硫酸盐进入海洋的变化,以及海洋环流的变化。我们建议一些新的地球化学数据和模型可以如何提高我们对影响全球硫循环的各种地球表面过程的理解,并勾勒出解释 δ34Ssw 波动的其他地质区间的框架。其中包括与黄铁矿形成和埋藏相关的数量、位置或分馏的变化,硫酸盐进入海洋的变化,以及海洋环流的变化。我们建议一些新的地球化学数据和模型如何提高我们对影响全球硫循环的各种地球表面过程的理解,并勾勒出解释 δ34Ssw 波动的其他地质区间的框架。
更新日期:2020-10-01
down
wechat
bug