ORCID Profile
0000-0002-4614-3774
Current Organisation
University of St Andrews
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Publisher: Springer Science and Business Media LLC
Date: 17-11-2013
DOI: 10.1038/NGEO2005
Publisher: Geological Society of America
Date: 21-03-2014
DOI: 10.1130/G35363.1
Publisher: Elsevier BV
Date: 03-2019
Publisher: Elsevier BV
Date: 08-2015
Publisher: Proceedings of the National Academy of Sciences
Date: 06-2020
Abstract: The inability to resolve the exact temporal relationship between two pivotal events in Earth history, the Paleoproterozoic Great Oxidation Event (GOE) and the first “snowball Earth” global glaciation, has precluded assessing causality between changing atmospheric composition and ancient climate change. Here we present temporally resolved quadruple sulfur isotope measurements (δ 34 S, ∆ 33 S, and ∆ 36 S) from the Paleoproterozoic Seidorechka and Polisarka Sedimentary Formations on the Fennoscandian Shield, northwest Russia, that address this issue. Sulfides in the former preserve evidence of mass-independent fractionation of sulfur isotopes (S-MIF) falling within uncertainty of the Archean reference array with a ∆ 36 S/∆ 33 S slope of −1.8 and have small negative ∆ 33 S values, whereas in the latter mass-dependent fractionation of sulfur isotopes (S-MDF) is evident, with a ∆ 36 S/∆ 33 S slope of −8.8. These trends, combined with geochronological constraints, place the S-MIF/S-MDF transition, the key indicator of the GOE, between 2,501.5 ± 1.7 Ma and 2,434 ± 6.6 Ma. These are the tightest temporal and stratigraphic constraints yet for the S-MIF/S-MDF transition and show that its timing in Fennoscandia is consistent with the S-MIF/S-MDF transition in North America and South Africa. Further, the glacigenic part of the Polisarka Formation occurs 60 m above the sedimentary succession containing S-MDF signals. Hence, our findings confirm unambiguously that the S-MIF/S-MDF transition preceded the Paleoproterozoic snowball Earth. Resolution of this temporal relationship constrains cause-and-effect drivers of Earth’s oxygenation, specifically ruling out conceptual models in which global glaciation precedes or causes the evolution of oxygenic photosynthesis.
Publisher: Elsevier BV
Date: 05-2015
Publisher: Elsevier BV
Date: 2020
Publisher: Elsevier BV
Date: 10-2014
Publisher: Elsevier BV
Date: 04-2021
Publisher: Elsevier BV
Date: 10-2020
Publisher: Elsevier BV
Date: 04-2019
Publisher: Elsevier BV
Date: 08-2022
Publisher: Geological Society of London
Date: 22-09-2015
DOI: 10.1144/JGS2014-042
Publisher: Elsevier BV
Date: 2013
Publisher: Elsevier BV
Date: 09-2013
Publisher: Geological Society of America
Date: 18-04-2014
DOI: 10.1130/B30884.1
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Tony Prave.