Highly fractionated chromium isotopes in Mesoproterozoic-aged shales and atmospheric oxygen

Nature Communications
Donald E CanfieldRobert Frei

Abstract

The history of atmospheric oxygen through the Mesoproterozoic Era is uncertain, but may have played a role in the timing of major evolutionary developments among eukaryotes. Previous work using chromium isotopes in sedimentary rocks has suggested that Mesoproterozoic Era atmospheric oxygen levels were too  low in concentration (<0.1% of present-day levels (PAL)) for the expansion of eukaryotic algae and for the evolution of crown-group animals that occurred later in the Neoproterozoic Era. In contrast, our new results on chromium isotopes from Mesoproterozoic-aged sedimentary rocks from the Shennongjia Group from South China is consistent with atmospheric oxygen concentrations of >1% PAL and thus the possibility that a permissive environment existed long before the expansion of various eukaryotic clades.

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Citations

Mar 17, 2020·Geobiology·Devon B ColeNoah J Planavsky
Sep 25, 2020·Science Advances·Aierken YierpanRonny Schoenberg
Jul 10, 2020·Interface Focus·Noah J PlanavskyRonny Schoenberg
Jul 10, 2020·Interface Focus·Timothy M Lenton
Jan 15, 2021·Nature Communications·Xiao-Ming LiuRobert M Hazen
Jun 3, 2021·Proceedings of the National Academy of Sciences of the United States of America·Don E CanfieldXiaomei Wang
Dec 17, 2021·Proceedings of the National Academy of Sciences of the United States of America·Peng LiuJames F Kasting

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Methods Mentioned

BETA
X-ray

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