Aa posted an Question
September 05, 2020 • 01:22 am 30 points
  • IIT JAM
  • Geology (GG)

Major events in archean proterozoic boundary ?

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    Sajan sarthak best-answer

    1.Changes In Eu anomalies in cratonic pelites 2. Heavy REE no longer depleted in most TTG 3. Increase in continental heat flow/production 4. Change in composition of subcontinental lithosphere 5. Decrease in komatiites 6. Decrease in Ni-Cr in basalts 7. Increase in REE-HFSE in GR basalts 8. Decrease in Cr-Ni in many pelites 9.Appearance of evaporites 10. Appearance of BIF 11.Changes in greenstone 12. Appearance of Eu anomalies ir greenstone pelites 13. Change in Th/U and La/Yb of pelites

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    origin of life ,i mean in paleontology view?

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    , acritarchs, bacteria(1) microbial fossils, (2) stromatolites, (3 ) chemosynthetic bacteriaon the boundary of Archean and Proterozoic.

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