首页|Pulses of atmosphere oxygenation during the Cambrian radiation of animals
Pulses of atmosphere oxygenation during the Cambrian radiation of animals
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NSTL
Elsevier
Oxygenation of the oceans and atmosphere has been invoked to be the prerequisite for the early Cambrian radiation of animals. However, the temporal and causal relationships between oxygenation and metazoan proliferation have not been fully explored. Here we report sulfur and oxygen isotope compositions (delta 34Sanhy and delta 18Oanhy) of marine anhydrite deposited around 516 to 506 million years ago (Ma) from the Tarim Basin, NW China. Using a biogeochemical model, we propose that a paired negative delta 18Oanhy (-4.5%0) and delta 34Sanhy (-8700) excursion between 515 and 510 Ma can best be explained by decreased isotope fractionation factors during sulfate reduction related to a 45% to 100% increase in atmospheric oxygen level (pO2). Significantly, evidence from this interval infers an oxygenation event in the backdrop of the most rapid radiation stage (ca. 520 to 510 Ma) during the Cambrian explosion, confirming that oxygen availability was a crucial factor in accelerating the radiation of marine animals.(c) 2022 Elsevier B.V. All rights reserved.
NSTL
Elsevier
