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Hit or miss: glacial incisions of snowball Earth

Hit or miss: glacial incisions of snowball Earth
Hit or miss: glacial incisions of snowball Earth
Estimated at ~58 Myr in duration, the Sturtian snowball Earth (ca. 717‐659 Ma) is one of the longest‐known glaciations in Earth history. Surprisingly few uncontroversial lines of evidence for glacial incisions associated with such a protracted event exist. We report here multiple lines of geologic field evidence for deep but variable glacial erosion during the Sturtian glaciation. One incision, on the scale of several kilometers, represents the deepest incision documented for snowball Earth; another much more modest glacial valley, however, suggests an erosion rate similar to sluggish Quaternary glaciers. The heterogeneity in snowball glacial incisions reported here and elsewhere were likely influenced by actively extending horst‐and‐graben topography associated with the breakup of supercontinent Rodinia.
0954-4879
Mitchell, Ross
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Gernon, Thomas
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Nordsvan, Adam
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Cox, Grant
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Li, Zheng-Xiang
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Hoffman, Paul
f240fd7d-d470-46c4-a0d6-563e1205b2c4
Mitchell, Ross
0d4f23e5-b18a-4bfa-8499-9c4502df71e0
Gernon, Thomas
658041a0-fdd1-4516-85f4-98895a39235e
Nordsvan, Adam
b3de8a6b-752c-4a93-84cc-cf50ae87ef5d
Cox, Grant
b9a7aea1-56ce-4537-8bd7-3c1f7b48ad58
Li, Zheng-Xiang
4dbec1aa-3fb9-4a80-a329-48846bfd6d92
Hoffman, Paul
f240fd7d-d470-46c4-a0d6-563e1205b2c4

Mitchell, Ross, Gernon, Thomas, Nordsvan, Adam, Cox, Grant, Li, Zheng-Xiang and Hoffman, Paul (2019) Hit or miss: glacial incisions of snowball Earth. Terra Nova. (doi:10.1111/ter.12400).

Record type: Article

Abstract

Estimated at ~58 Myr in duration, the Sturtian snowball Earth (ca. 717‐659 Ma) is one of the longest‐known glaciations in Earth history. Surprisingly few uncontroversial lines of evidence for glacial incisions associated with such a protracted event exist. We report here multiple lines of geologic field evidence for deep but variable glacial erosion during the Sturtian glaciation. One incision, on the scale of several kilometers, represents the deepest incision documented for snowball Earth; another much more modest glacial valley, however, suggests an erosion rate similar to sluggish Quaternary glaciers. The heterogeneity in snowball glacial incisions reported here and elsewhere were likely influenced by actively extending horst‐and‐graben topography associated with the breakup of supercontinent Rodinia.

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Erosion - Accepted Manuscript
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Accepted/In Press date: 29 March 2019
e-pub ahead of print date: 15 April 2019

Identifiers

Local EPrints ID: 430282
URI: https://eprints.soton.ac.uk/id/eprint/430282
ISSN: 0954-4879
PURE UUID: 8b48f6eb-608c-4f02-84c7-db9435855c84

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Date deposited: 24 Apr 2019 16:30
Last modified: 24 Apr 2019 16:30

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