前寒武纪
太古宙
带状铁形成
地质学
元古代
背景(考古学)
沉积岩
生物圈
地球科学
地球化学
古生物学
生态学
构造学
生物
作者
Kaarel Mänd,Leslie J. Robbins,Noah J. Planavsky,Andrey Bekker,Kurt O. Konhauser
标识
DOI:10.1017/9781108993791
摘要
Ancient iron formations - iron and silica-rich chemical sedimentary rocks that formed throughout the Precambrian eons - provide a significant part of the evidence for the modern scientific understanding of palaeoenvironmental conditions in Archaean (4.0–2.5 billion years ago) and Proterozoic (2.5–0.539 billion years ago) times. Despite controversies regarding their formation mechanisms, iron formations are a testament to the influence of the Precambrian biosphere on early ocean chemistry. As many iron formations are pure chemical sediments that reflect the composition of the waters from which they precipitated, they can also serve as nuanced geochemical archives for the study of ancient marine temperatures, redox states, and elemental cycling, if proper care is taken to understand their sedimentological context.
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