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Titanium isotopic evidence for felsic crust and plate tectonics 3.5 billion years ago

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Science  22 Sep 2017:
Vol. 357, Issue 6357, pp. 1271-1274
DOI: 10.1126/science.aan8086

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  • RE: Does higher P abundance necessarily mean higher P export?

    The concentration of P increases from 0.1% at 3.5 Ga to 0.14% at the Archean-Proterozoic boundary, as the proportion of felsic rocks in Earth’s emerged crust increases.
    But, does higher P content in continent exposed to weathering necessarily mean higher export to the ocean?
    I mean considering that the ultra-mafic and mafic rocks are less resistant to chemical weathering than the felsic rocks, is there a possibility that the higher weathering efficiency, despite the lower abundance, finally lead to higher P flux during Archean than present day?

    Competing Interests: None declared.
  • RE: Origin of life

    Does the ultra-mafic composition of magma pre 3.5 Byr. ago mean that serpentine was formed close to the surface (which would have been anoxic) rather than in white smokers?

    Competing Interests: None declared.