Extreme variability in atmospheric oxygen levels in the late Precambrian.
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ABSTRACT: Mapping the history of atmospheric O2 during the late Precambrian is vital for evaluating potential links to animal evolution. Ancient O2 levels are often inferred from geochemical analyses of marine sediments, leading to the assumption that the Earth experienced a stepwise increase in atmospheric O2 during the Neoproterozoic. However, the nature of this hypothesized oxygenation event remains unknown, with suggestions of a more dynamic O2 history in the oceans and major uncertainty over any direct connection between the marine realm and atmospheric O2. Here, we present a continuous quantitative reconstruction of atmospheric O2 over the past 1.5 billion years using an isotope mass balance approach that combines bulk geochemis
SUBMITTER: Krause AJ
PROVIDER: S-EPMC9565794 | biostudies-literature | 2022 Oct
REPOSITORIES: biostudies-literature
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