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The Cottons Breccia (Ediacaran) and its tectonostratigraphyic context within the Grassy Group, King Island, Australia: a rift-related gravity slump deposit

Citation

Direen, N and Jago, JB, The Cottons Breccia (Ediacaran) and its tectonostratigraphyic context within the Grassy Group, King Island, Australia: a rift-related gravity slump deposit, Precambrian Research, 165, (1) pp. 1-14. ISSN 0301-9268 (2008) [Refereed Article]

DOI: doi:10.1016/j.precamres.2008.05.008

Abstract

The Cottons Breccia is part of the upper Neoproterozoic (Ediacaran: 586-572 Ma) Grassy Group, exposed on King Island, Tasmania. This formation has been widely interpreted as an unambiguous tillite, in support of tectono-climatic models that invoke catastrophic latest Neoproterozoic global glaciation. However, dissenting opinions interpret the Cottons Breccia as a tectonic breccia. In this paper, we review the tectonostratigraphy of the Cottons Breccia, and the enclosing Grassy Group. We find no unambiguous evidence for a direct glacial origin, as postulated by some early workers. An interpretation of the Cottons Breccia as a deposit within half-graben in the shoulder regions of an actively developing latest Neoproterozoic volcanic rifted margin is consistent with all the available sedimentological, structural, geochronological, and tectonic evidence. © 2008 Elsevier B.V. All rights reserved.

Item Details

Item Type:Refereed Article
Research Division:Earth Sciences
Research Group:Geology
Research Field:Tectonics
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Direen, N (Dr Nicholas Direen)
ID Code:56672
Year Published:2008
Web of Science® Times Cited:14
Deposited By:Earth Sciences
Deposited On:2009-05-19
Last Modified:2009-05-21
Downloads:0

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