EPSC 201 Lecture Notes - Lecture 21: Cyanobacteria, Canon Eos 60D, Paleozoic
30 May 2016
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Document Summary
The ultramafic mantle remained as a thick outer shell: earth formed 4. 57 ga, based on radiometric analysis of planetesimal fragment meteorites, differentiated into core and mantle by 4. 5 ga, much of surface remained a magma ocean until around 4. 4 ga, collision with a mars sized proto planet around 4. 4 4. 5 ga. Bitter springs, australia (850 million years: the proterozoic eon, protero first, zoic life, time between 2. 5 and 0. 542 ga, saw the unfamiliar archean world transition to an earth like the one we know today, lasting nearly 2 billion years (2ga), the proterozoic is almost half of earth history, there were fewer, larger lithospheric plates and larges continental landmasses. Rodinia rifted apart around 700 ma: pannotia was a short lived supercontinent that formed about 600 ma and broke apart soon after, atmospheric oxygen (o2) skyrocketed between 2. 4 and 2. 2 ga as a result of cyanobacteria (blue green algae, evidence of oxygen buildup is preserved in banded iron formations (bifs)
