EARTH 101 Lecture Notes - Lecture 5: Great Oxygenation Event, Banded Iron Formation, Igneous Rock
16 Mar 2018
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Clump together and start to react (getting hot) Once planetessimals are big enough to melt, the formation of a melt separates the components of a rock > you get a whole new set of different minerals (incongruent melting) Ocean crust is forming (weathering) > ocean crust goes down into the mantle and is reforming at the top. Banded iron formation - rise of oxygen led to these red sea sediments. Tell us about when the atmosphere gained its oxygen. Tells us there must have been a lot of iron dissolved in the earth. At the later stages, banded iron formations stop forming. Snowball earth (1 ga) - when the entire surface of the planet is covered in ice (evidence: glacial ice, ocean sediments no longer receiving oxygen because they are covered in ice) Motion of the plates on the surface of the earth caused this climate change. The diversity of minerals was impacted by climate and life.
