South Australian U-Pb zircon (CA-ID-TIMS) age supports globally synchronous Sturtian deglaciation
South Australian U-Pb zircon (CA-ID-TIMS) age supports globally synchronous Sturtian deglaciation
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 Bolla Bollana 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.
Cox, Grant
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Isakson, Vincent
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Hoffman, Paul
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Gernon, Thomas
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Schmitz, Mark
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Shahin, Sameh
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Collins, Alan
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Preiss, Wolfgang
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Blades, Morgan
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Mitchell, Ross
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Nordsvan, Adam
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Cox, Grant
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Isakson, Vincent
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Hoffman, Paul
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Gernon, Thomas
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Schmitz, Mark
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Shahin, Sameh
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Collins, Alan
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Preiss, Wolfgang
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Blades, Morgan
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Mitchell, Ross
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Nordsvan, Adam
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Cox, Grant, Isakson, Vincent, Hoffman, Paul, Gernon, Thomas, Schmitz, Mark, Shahin, Sameh, Collins, Alan, Preiss, Wolfgang, Blades, Morgan, Mitchell, Ross and Nordsvan, Adam
(2018)
South Australian U-Pb zircon (CA-ID-TIMS) age supports globally synchronous Sturtian deglaciation.
Precambrian Research.
(doi:10.1016/j.precamres.2018.07.007).
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 Bolla Bollana 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.
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Gernon_PrecambrianResearch
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Accepted/In Press date: 17 July 2018
e-pub ahead of print date: 20 July 2018
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Local EPrints ID: 422540
URI: http://eprints.soton.ac.uk/id/eprint/422540
ISSN: 0301-9268
PURE UUID: 7e429bc5-9a41-43ca-93eb-188c17684376
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Date deposited: 25 Jul 2018 16:30
Last modified: 16 Mar 2024 06:54
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Author:
Grant Cox
Author:
Vincent Isakson
Author:
Paul Hoffman
Author:
Mark Schmitz
Author:
Sameh Shahin
Author:
Alan Collins
Author:
Wolfgang Preiss
Author:
Morgan Blades
Author:
Ross Mitchell
Author:
Adam Nordsvan
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