At ~ 4.0–2.5 billion years ago, seawater was saturated with Si and the silicified seafloor was rich in heavy Si (IMAGE)

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At ~ 4.0–2.5 billion years ago, seawater was saturated with Si and the silicified seafloor was rich in heavy Si

Caption

At ~ 4.0–2.5 billion years ago, seawater was saturated with Si and the silicified seafloor was rich in heavy Si. The study found a change between 4.0—before heavy Si was incorporated into granitic magma—and 3.8 Ga—when it was incorporated for the first time.

Credit

Prof. LI Xianhua’s group

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