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Type: Journal article
Title: South Australian U-Pb zircon (CA-ID-TIMS) age supports globally synchronous Sturtian deglaciation
Author: Cox, G.
Isakson, V.
Hoffman, P.
Gernon, T.
Schmitz, M.
Shahin, S.
Collins, A.
Preiss, W.
Blades, M.
Mitchell, R.
Nordsvan, A.
Citation: Precambrian Research, 2018; 315:257-263
Publisher: Elsevier
Issue Date: 2018
ISSN: 0301-9268
Statement of
Grant M.Cox, Vincent Isakson, Paul F.Hoffman, Thomas M.Gernon, Mark D.Schmitz, Sameh Shahin, Alan S.Collins, Wolfgang Preiss, Morgan L.Blades, Ross N.Mitchell, Adam Nordsvan
Abstract: A central prediction of the Snowball Earth hypothesis is that glacial onset should be synchronous at low latitudes, and its termination should be rapid and synchronous globally. High precision U/Pb zircon ages provide supporting evidence for the synchronous onset (within error) of the Sturtian glaciation (ca. 716 Ma) on multiple continents. Successful application of Re-Os techniques on organic rich shales and carbonates allow for the possibility of a globally synchronous Sturtian deglaciation (ca. 660 Ma), but the sparse isotopic age constraints leave this open to debate. Here we report the first high precision U-Pb zircon age of 663.03 ± 0.11 Ma (2σ) for the end Sturtian recorded in the Wilyerpa Formation of South Australia. This age supports previously published ages and is permissive with a globally synchronous deglaciation. In conjunction with the timing of glacial onset, this age reinforces the ca. 58 Myr duration of the Sturtian Snowball.
Keywords: Snowball Earth; Sturtian; synchronous deglaciation; CA-ID-TIMS; Wilyerpa Formation; South Australia
Rights: Crown Copyright © 2018 Published by Elsevier B.V. All rights reserved.
DOI: 10.1016/j.precamres.2018.07.007
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