Biological diversification linked to environmental stabilization following the Sturtian Snowball glaciation

Bowyer, Fred T., Krause, Alexander J. ORCID: https://orcid.org/0000-0002-9771-8101, Song, Yafang, Huang, Kang-Jun, Fu, Yong, Shen, Bing, Li, Jin, Zhu, Xiang-Kun, Kipp, Michael A., van Maldegem, Lennart M., Brocks, Jochen J., Shields, Graham A., Le Hir, Guillaume, Mills, Benjamin J. W. and Poulton, Simon W. 2023. Biological diversification linked to environmental stabilization following the Sturtian Snowball glaciation. Science Advances 9 (34) , eadf9999. 10.1126/sciadv.adf9999

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Abstract

The body fossil and biomarker records hint at an increase in biotic complexity between the two Cryogenian Snowball Earth episodes (ca. 661 million to ≤650 million years ago). Oxygen and nutrient availability can promote biotic complexity, but nutrient (particularly phosphorus) and redox dynamics across this interval remain poorly understood. Here, we present high-resolution paleoredox and phosphorus phase association data from multiple globally distributed drill core records through the non-glacial interval. These data are first correlated regionally by litho- and chemostratigraphy, and then calibrated within a series of global chronostratigraphic frameworks. The combined data show that regional differences in postglacial redox stabilization were partly controlled by the intensity of phosphorus recycling from marine sediments. The apparent increase in biotic complexity followed a global transition to more stable and less reducing conditions in shallow to mid-depth marine environments and occurred within a tolerable climatic window during progressive cooling after post-Snowball super-greenhouse conditions.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Earth and Environmental Sciences
Publisher:	American Association for the Advancement of Science
ISSN:	2375-2548
Date of Acceptance:	25 July 2023
Last Modified:	18 Sep 2024 15:45
URI:	https://orca.cardiff.ac.uk/id/eprint/171982

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