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

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Prave_2016_Geology_MarinoanGlaciation_AM.pdf (987.4Kb)
Date
01/08/2016
Author
Prave, Anthony Robert
Condon, Daniel J.
Hoffmann, Karl Heinz
Tapster, Simon
Fallick, Anthony Edward
Keywords
GE Environmental Sciences
NDAS
BDC
R2C
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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.
Citation
Prave , A R , Condon , D J , Hoffmann , K H , Tapster , S & Fallick , A E 2016 , ' Duration and nature of the end-Cryogenian (Marinoan) glaciation ' , Geology , vol. 44 , no. 8 , pp. 631-634 . https://doi.org/10.1130/G38089.1
Publication
Geology
Status
Peer reviewed
DOI
https://doi.org/10.1130/G38089.1
ISSN
0091-7613
Type
Journal article
Rights
© 2016 Geological Society of America. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://dx.doi.org/10.1130/G38089.1
Description
This work was supported by NERC Isotope Geoscience Facility Steering Committee grant IP-1462-0514.
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  • University of St Andrews Research
URI
http://hdl.handle.net/10023/10898

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