Page1 - Compostion of atmosphere, Lecture notes of Climatology

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Tron Catastrophe - earth was warm enough to melt iron. The molten iron was drawn (by gravity) to the center of the earth. Lighter materials (Si, O, Al, Na, Ca, K) rose to the surface. 2.7 BYA 2BYA Red Beds . O> starts to red-colored sedimentary | 4.5 -4.6 BYA sparred nn build up in the rocks on earth's surface birth of the earth ona atmosphere none older than ~2BYA igin formation 3.5 -3.8 BYA of the moon fossilized stromatolites NU <> 1 1 1 t t + 3 4B 3B 2B at 41 BYA banded iron formation 500-600 MYA oldest rocks s 3-1.8BYA OQ, concentration inet oxygen in ocean water reacts with about the same as today dissolved iron to form 4.4 BYA hematite (Fe2O3) and zircons magnetite (Fe304) oldest minerals MYA - millions of years ago BYA - billions of years ago