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The glacial succession of Sturtian age in South Australia: the Yudnamutana Subgroup

By
Wolfgang V. Preiss
Wolfgang V. Preiss
Geological Survey Branch, Primary Industries and Resources South Australia, GPO Box 1671 Adelaide, South Australia 5001, Australia
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Victor A. Gostin
Victor A. Gostin
School of Earth and Environmental Sciences, University of Adelaide, South Australia 5005, Australia
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David M. Mckirdy
David M. Mckirdy
School of Earth and Environmental Sciences, University of Adelaide, South Australia 5005, Australia
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Paul M. Ashley
Paul M. Ashley
School of Earth Sciences, University of New England, Armidale, New South Wales 2351, Australia
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George E. Williams
George E. Williams
School of Earth and Environmental Sciences, University of Adelaide, South Australia 5005, Australia
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Philip W. Schmidt
Philip W. Schmidt
CSIRO Exploration and Mining, PO Box 136, North Ryde, New South Wales 1670, Australia
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Published:
January 01, 2011

Abstract

The record of two Neoproterozoic glaciations in South Australia has been known for about a century. The earlier glaciation, of Sturtian age, is represented by the Yudnamutana Subgroup and is characterized by widespread diamictites with both intrabasinal and extrabasinal clasts, some locally faceted and striated. Associated facies include shallow-water sandstone, bedded and laminated siltstone with lonestones and dropstones, and sedimentary ironstones (mainly ferruginous siltstone and diamictite). Proximal settings adjacent to the Curnamona Province display massive basement-derived conglomerate and gigantic basement megaclasts (up to hundreds of metres across).

Sturtian glaciogenic sediments of the Yudnamutana Subgroup unconformably overlie a variety of older rock units, including crystalline basement near basin margins and uppermost Burra Group sediments in the depocentre, and were deposited both in shallow marine shelf environments and in tectonically active rift basins encircling the Curnamona Province, with corresponding increases in total thickness from 100–300 m to more than 5 km.

Recent U–Pb zircon SHRIMP dating of a thin volcaniclastic layer indicates that the waning stages of the Sturtian glaciation occurred at c. 660 Ma. Unlike the deposits of the younger Elatina glaciation, the Yudnamutana Subgroup has so far not yielded reliable palaeomagnetic data.

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Contents

Geological Society, London, Memoirs

The Geological Record of Neoproterozoic Glaciations

Emmanuelle Arnaud
Emmanuelle Arnaud
University of Guelph, Canada
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Galen P. Halverson
Galen P. Halverson
McGill University, Canada
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Graham Shields-Zhou
Graham Shields-Zhou
University College London, UK
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Geological Society of London
Volume
36
ISBN electronic:
9781862394117
Publication date:
January 01, 2011

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