There were many atmospheric and oceanic oxygen fluctuations during the Paleozoic Era (from around 542 to 251 million years ago). This video covers the timing & extent of, the geochemical and isotopic evidence for, and the biological ramifications of these oxygen fluctuations. The lines of evidence for oxygen increases and decreases during the Paleozoic include carbon isotope excursions (like the SPICE event), redox sensitive trace elements such as molybdenum (Mo), vanadium (V), and even rare earth elements such as cerium (Ce). The timing of the major rise in oxygen during the Devonian coincides with large land plant evolution (which contributed to the first forests and oxygenation by photosynthesis as well as soil production which increased weathering and therefore carbon sink and oxygen source). We also talk about the large role sponges may have played in the oxygenation of the ocean.
References: Oxygen: A Four Billion Year History by Donald E. Canfield (possibly my favorite book ever, highly recommend!): amzn.to/3jcujmW
Earth System History by Steven Stanley: amzn.to/3y65jC8
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0:00 Neoproterozoic Recap
1:56 Paleozoic O2 fluctuations ramifications
2:19 Biodiversity correlates with O2 fluctuations
3:40 Mo evidence for a Devonian oxidation event (DOE)
7:55 Ce evidence for the DOE
10:20 Ce correlates with O2 through Paleozoic
11:24 How animals & plants were affected
12:04 Land plant evolution increased O2?
12:30 How soil formation oxidized Earth
13:50 Was there a Cambrian deoxygenation event (CDE)?
14:49 C evidence for Cambrian deoxygenation
16:47 How was O2 in the ocean affected?
19:40 The 'age of fish' due to O2 rise?
20:11 How reefs were affected by the O2 changes
22:14 Cambrian to Devonian biodiversity and O2 evolution
23:04 Earth oxygenation summary
24:41 Bloopers!
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nephicode.blogspot.com/2017/0...
www.sciencedirect.com/science...
www.pnas.org/content/107/42/1...
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www.ncbi.nlm.nih.gov/pmc/arti...
paleoexhibit.blogspot.com/2015...
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Негізгі бет Ғылым және технология Early Paleozoic Oxygen History: Evidence & Reasons for Paleozoic Oxygen Fluctuations | GEO GIRL
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