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Recycled selenium in hot spot-influenced lavas records ocean-atmosphere oxygenation.
Science Advances ( IF 13.6 ) Pub Date : 2020-09-23 , DOI: 10.1126/sciadv.abb6179
Aierken Yierpan 1 , Stephan König 1 , Jabrane Labidi 1, 2 , Ronny Schoenberg 1, 3
Affiliation  

Oxygenation of Earth’s oceans and atmosphere through time has consequences for subducted surface signatures that are now stored in the mantle. Here, we report significant mass-dependent selenium isotope variations in modern hot spot–influenced oceanic lavas. These variations are correlated with tracers of mantle source enrichment, which can only be explained by incorporation of abyssal pelagic sediments subducted from a redox-stratified mid-Proterozoic ocean. Selenium geochemical signatures of these sediments have mostly been preserved during long-term recycling and may therefore complement the global surface sediment record as ancient oxygen archives. Combined deep mantle and surface perspectives, together with emerging models for atmospheric oxygen based on selenium systematics, further imply a significantly oxygenated ocean-atmosphere system throughout the mid-Proterozoic.



中文翻译:

受热点影响的熔岩中的回收硒记录了海洋-大气氧合。

随着时间的推移,地球海洋和大气的氧化会对现在存储在地幔中的俯冲表面特征产生影响。在这里,我们报告了现代热点影响的海洋熔岩中显着的质量依赖性硒同位素变化。这些变化与地幔源富集的示踪剂相关,这只能通过从氧化还原层状中元古代海洋俯冲的深海中上层沉积物的结合来解释。这些沉积物的硒地球化学特征大多在长期循环过程中得到保存,因此可以作为古代氧气档案补充全球表层沉积物记录。结合深地幔和地表视角,以及基于硒系统学的大气氧新模型,

更新日期:2020-09-24
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