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Old, strong continental lithosphere with weak Archaean margin at approximately 1.8 Ga, Kaapvaal Craton, South Africa

Justine H. Tinker, Maarten J. de Wit and Leigh H. Royden
Old, strong continental lithosphere with weak Archaean margin at approximately 1.8 Ga, Kaapvaal Craton, South Africa (in Kaapvaal Craton, Maarten J. de Wit (editor), Stephen H. Richardson (editor) and Lewis D. Ashwal (editor))
South African Journal of Geology (June 2004) 107 (1-2): 255-260

Abstract

Low elastic strength of ancient lithosphere based on flexural analyses has been interpreted to reflect elevated regional geothermal gradients in response to higher global heat production in the past. Here we present a flexural analysis of Archean/Palaeoproterozoic sediment cover along the western margin of the Archean Kaapvaal craton based on seismic stratigraphy. Our results show that between approximately 1.93 and approximately 1.75 Ga, the Archaean margin of the craton had an effective elastic thickness of 7.5 to 10 km compared to its present day value of 60 to 70 km. Because the Kaapvaal craton had already stabilized by approximately 2.7 Ga and was underlain by 150 to 300 km thick strong mantle lithosphere, it is unlikely that the relatively thin elastic thickness along this old margin reflects a change in secular cooling of the Earth. Instead, we interpret the low elastic strength to be a transient marginal tectonic effect similar to that recorded along modern continental margins.


ISSN: 1012-0750
EISSN: 1996-8590
Coden: TGSAA3
Serial Title: South African Journal of Geology
Serial Volume: 107
Serial Issue: 1-2
Title: Old, strong continental lithosphere with weak Archaean margin at approximately 1.8 Ga, Kaapvaal Craton, South Africa
Title: Kaapvaal Craton
Author(s): Tinker, Justine H.de Wit, Maarten J.Royden, Leigh H.
Author(s): de Wit, Maarten J.editor
Author(s): Richardson, Stephen H.editor
Author(s): Ashwal, Lewis D.editor
Affiliation: University of Cape Town, Geological Sciences, Rondebosch, South Africa
Affiliation: University of Cape Town, Department of Geosciences, Rondebosch, South Africa
Pages: 255-260
Published: 200406
Text Language: English
Publisher: Bureau for Scientific Publications, Pretoria, South Africa
References: 30
Accession Number: 2005-073202
Categories: Solid-earth geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sketch map
S35°00'00" - S15°30'00", E12°00'00" - E33°40'00"
Secondary Affiliation: University of the Witwatersrand, ZAF, South AfricaMassachusetts Institute of Technology, USA, United States
Country of Publication: South Africa
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute.
Update Code: 200524
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