GSC102 TEST 2 C ARCHEAN

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8 Terms

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Six Archean characteristics

Stabilized, much hotter inside, oceans, earliest life, stromatolites, almost no free O₂

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Old stable continental crust

Craton

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Rock indicating an extremely hot mantle

Komatiite

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Basaltic lava erupted underwater

Pillow Basalt

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Layered structure built by microbial mats

Stromatolite

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Layered iron-rich sediment from O₂ + dissolved iron

Banded Iron Formation (BIF)

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Why was atmospheric O₂ low if microbes made oxygen?

It reacted with dissolved iron and volcanic gases first

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How do BIFs show oxygen production began?

O₂ reacted with dissolved iron, making iron oxide layers