Volcanic controls on seawater sulfate over the past 120 million years

Volcanic controls on seawater sulfate over the past 120 million years
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过去1.2亿年火山对海水硫酸盐的控制

DOI:
10.1073/pnas.1921308117
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发表时间:
2020
期刊:
Proceedings of the National Academy of Sciences
影响因子:
--
通讯作者:
Johnston, David
Johnston, David
中科院分区:
--
文献类型:
--
作者:
Laakso, Thomas A.;Waldeck, Anna;Macdonald, Francis A.;Johnston, David

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从海相重晶石的硫同位素组成推断了地质硫循环的变化。中生代至今的34 S/32 S记录的结构包括1050 - 100-Ma的逐步增加,被解释为微生物同位素效应或构造突变和相关黄铁矿埋藏的结果。解开控制海洋硫循环和相关同位素变化的物理过程对于理解气候,大气氧化和海洋生态如何在地质时期共同进化至关重要。在这里,我们表明,硫脱气与侵位的大火成岩省可以产生明显的逐步跳跃的同位素记录时,再加上长期的变化,埋藏效率。在我们的模型中,大型火成岩省的记录映射到所需的出气事件,硫同位素记录中的两个最大的步骤与大型火成岩省进入挥发物丰富的沉积盆地的位置相吻合。这个解决方案提供了一个定量的图片的最后120我的变化在海洋中最大的氧化剂水库。
Changes in the geological sulfur cycle are inferred from the sulfur isotopic composition of marine barite. The structure of the34S/32S record from the Mesozoic to present, which includes ∼50- and 100-Ma stepwise increases, has been interpreted as the result of microbial isotope effects or abrupt changes to tectonics and associated pyrite burial. Untangling the physical processes that govern the marine sulfur cycle and associated isotopic change is critical to understanding how climate, atmospheric oxygenation, and marine ecology have coevolved over geologic time. Here we demonstrate that the sulfur outgassing associated with emplacement of large igneous provinces can produce the apparent stepwise jumps in the isotopic record when coupled to long-term changes in burial efficiency. The record of large igneous provinces map onto the required outgassing events in our model, with the two largest steps in the sulfur isotope record coinciding with the emplacement of large igneous provinces into volatile-rich sedimentary basins. This solution provides a quantitative picture of the last 120 My of change in the ocean’s largest oxidant reservoir.
加拿大努纳武特地区高北极大型火成岩省的神秘块状硫化物矿化
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