风化作用
硅酸盐
土(古典元素)
稳定同位素比值
自行车
焊剂(冶金)
同位素
地质学
矿物
矿物学
环境科学
地球科学
环境化学
大气科学
地球化学
化学
物理
历史
考古
有机化学
量子力学
数学物理
作者
Shaily Rahman,Elizabeth J. Trower
出处
期刊:Science Advances
[American Association for the Advancement of Science (AAAS)]
日期:2023-12-08
卷期号:9 (49)
标识
DOI:10.1126/sciadv.adi2440
摘要
Geological reservoir δ30Si values have increasingly been applied as paleoclimate and paleoproductivity proxies. Many of these applications rely on the assumption that the surface Earth Si isotope budget is in mass balance with bulk silicate Earth, such that trends in δ30Si over time can be attributed to changes in flux to or from key silica reservoirs. We compiled δ30Si data from modern reservoirs representing the major sources and sinks of surface Earth reactive silica, to which we applied an inverse model to test assumptions about mass balance. We found that δ30Si values of reverse weathering products must closely match those of diatoms, conflicting with previous assumptions. Model results also revealed that of the 19 to 21 teramoles per year Si released during silicate mineral weathering, ~10 to 18 teramoles per year is stored in terrestrial silica sinks, consistent with assumptions of incongruent weathering reactions. Our results demonstrated that the modern silica cycle summary is in isotopic mass balance.
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