A biological switch at the ocean surface as a cause of laminations in a Precambrian iron formation
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- 作者：K. Hashizumea ; kohash@ess.sci.osaka-u.ac.jp" class="auth_mail" title="E-mail the corresponding author ; D.L. Pintib ; B. Orbergerc ; C. Cloquetd ; M. Jayanandae ; H. Soyamaa
- 关键词：banded iron formation ; lamination ; nitrogen isotope ; organic productivity ; iron isotope ; iron reduction
- 刊名：Earth and Planetary Science Letters
- 出版年：2016
- 出版时间：15 July 2016
- 年：2016
- 卷：446
- 期：Complete
- 页码：27-36
- 全文大小：1368 K
文摘
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BIF formation is elucidated by integrating N and Fe isotopes analyzed band-to-band.
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The new BIF lamination model includes iron reduction as a key process.
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Laminations are triggered by the shift in biomass at ocean surface.
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Si-rich bands formed through reduction/dissolution of iron oxides by organic matter.
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The shift in biomass may correspond to fluctuation in photosynthetic activity.