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Duration and nature of the end-Cryogenian (Marinoan) glaciation

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Anthony Robert Prave, Daniel J. Condon, Karl Heinz Hoffmann, Simon Tapster, Anthony Edward Fallick

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Abstract

The end-Cryogenian glaciation (Marinoan) is portrayed commonly as the archetype of snowball Earth, yet its duration and character remain uncertain. Here we report U-Pb zircon ages for two ash beds from widely separated localities of the Marinoan-equivalent Ghaub Formation in Namibia: 639.29 ± 0.26 Ma and 635.21 ± 0.59 Ma. These findings verify, for the first time, the key prediction of the snowball Earth hypothesis for the Marinoan glaciation, i.e., longevity, with a duration of ≥4 m.y. They also show that the nonglacial interlude of Cryogenian time spanned 20 m.y. or less and that glacigenic erosion and sedimentation, and at least intermittent open-water conditions, occurred 4 m.y. prior to termination of the Marinoan glaciation.
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Original languageEnglish
Pages (from-to)631-634
Number of pages4
JournalGeology
Volume44
Issue number8
Early online date28 Jun 2016
DOIs
StatePublished - 1 Aug 2016

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