Deconstructing the Transvaal Supergroup, South Africa: implications for Palaeoproterozoic palaeoclimate models

Moore, J.M. and Tsikos, Harilaos and Polteau, Stéphane (2001) Deconstructing the Transvaal Supergroup, South Africa: implications for Palaeoproterozoic palaeoclimate models. Journal of African Earth Sciences, 33 (3-4). pp. 437-444. ISSN 0899-5362

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Official URL: http://dx.doi.org/10.1016/S0899-5362(01)00084-7

Abstract

Current correlations between the Pretoria and Postmasburg Groups of the Transvaal Supergroup are shown to be invalid. The Postmasburg Group is also demonstrated to be broadly conformable with the underlying Ghaap Group and therefore considerably older (~2.4 Ga) than previously supposed. The new stratigraphy documents an extensive (100 Ma) and continuous cold-climate episode with a glacial maximum at the Makganyene Formation diamictite. Iron formations of the underlying Asbesheuwels and Koegas Subgroups and overlying Hotazel Formation have similar origins, related, respectively, to the onset and cessation of the glacial event. This interpretation of the Transvaal Supergroup stratigraphy has significant implications for various Palaeoproterozoic environmental models and for the timing of the development of an oxygenated atmosphere.

Item Type:Article
Uncontrolled Keywords:Glacial palaeoclimate; stratigraphy; Neoarchaean-Palaeoproterozoic; Transvaal Supergroup; paleoatmosphere; paleoclimate; Proterozoic; stratigraphic correlation; South Africa
Subjects:Y Unknown > Subjects to be assigned
Divisions:Faculty > Faculty of Commerce > Management
ID Code:446
Deposited By:INVALID USER
Deposited On:31 Oct 2006
Last Modified:06 Jun 2013 06:27
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