An interpretation of mafic dyke swarms and their relationship with major mafic magmatic events on the Kaapvaal Craton and Limpopo Belt

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Authors:Uken, R.; Watkeys, M. K.
Author Affiliations:Primary:
University of Natal, Department of Geology and Applied Geology, Durban, South Africa
Volume Title:Special issue on the proceedings of the Plumes, plates and mineralisation '97 symposium
Volume Authors:Hatton, C. J., editor
Source:South African Journal of Geology, 100(4), p.341-348; Plumes, plates and mineralisation, Pretoria, South Africa, Apr. 14-18, 1997, edited by C. J. Hatton. Publisher: Bureau for Scientific Publications, Pretoria, South Africa. ISSN: 1012-0750
Publication Date:1997
Note:In English with Afrikaans summary. 58 refs.; illus., incl. 1 table, geol. sketch map
Summary:Mafic dyke swarms on the Kaapvaal craton and Limpopo Belt record successive periods of magmatism and volcanism, that in most cases can be linked to continental-scale rifting and events on the margins of the Kaapvaal craton. Precambrian mafic dykes are typically oriented at high angles to the craton margins. The preservation of such dyke swarm geometries can be explained in terms of a plate tectonic model in which mafic dykes intrude a stable craton in the early stages of continental break-up, forming a triple junction. Two of the rift arms develop into a passive margin with continental parallel dyke swarms and the third arm, represented by dykes at a high angle to the continental margin, develops into a failed rift. Although only the failed rift of the Precambrian mafic dyke swarms is preserved, the Karoo dykes preserve both the failed rift-type dyke swarms at a high angle to the craton margin, as well as dyke swarms parallel to the existing craton margin related to coeval volcanism along these boundaries during Gondwana break-up. [R.A.H.]
Sections:Petrology
Subsections:General
Subjects:Archean; Basement; Diabase; Dike swarms; Gold ores; Granites; Igneous rocks; Intrusions; Mafic composition; Mesozoic; Metal ores; Mineralization; Paleogeography; Plate tectonics; Plutonic rocks; Precambrian; Structural controls; Transvaal Supergroup; Volcanism; Africa; Bushveld Complex; Kaapvaal Craton; Limpopo Belt; South Africa; Southern Africa; Usushwana Complex
Coordinates:S260000 S240000 E0310000 E0300000
Abstract Numbers:98M/4189
Record ID:1998052450
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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