The olivine melilitite-"kimberlite"-carbonatite suite of Namaqualand and Bushmanland, South Africa

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Authors:Moore, A. E.; Verwoerd, W. J.
Author Affiliations:Primary:
Seltrust Botswana Explor., Botswana, South Africa
Univ. Stellenbosch, South Africa
Volume Title:Verhandelinge van die Geologiese Vereniging van Suid Afrika Transactions of the Geological Society of South Africa
Source:Verhandelinge van die Geologiese Vereniging van Suid Afrika = Transactions of the Geological Society of South Africa, 88(2), p.281-294. Publisher: Geological Society of South Africa, Marshalltown, South Africa. ISSN: 0371-7208
Publication Date:1985
Note:In English. 51 refs.; illus. incl. 3 tables, sect., geol. sketch maps
Summary:An association of early Tertiary sediment and breccia-filled diatremes, olivine melilitite plugs, kimberlite pipes of doubtful status and a glimmerite-carbonatite complex is related to a craton-margin tectonic-setting. Four different populations of olivine, distinguished on textural and geochemical grounds point towards a complex crystallization history of the olivine melilitites. Spherical inclusions in olivine phenocrysts are interpreted as evidence of multiphase liquid immiscibility: apart from silicate magma at least three other liquids (sulphide, carbonate and hydrous fluids) appear to have existed at an early stage of crystallization. The differences between olivine melilitites, 'kimberlites', glimmerites and carbonatites are tentatively ascribed to differing proportions of volatile components retained or exsolved from the magma at shallow levels. (Authors' abstract) [C.N.]
Subjects:Carbonatites; Cenozoic; Chemical composition; Genesis; Igneous rocks; Kimberlite; Melilitite; Nesosilicates; Olivine; Olivine group; Orthosilicates; Petrography; Petrology; Silicates; Tertiary; Ultramafic composition; Volcanic rocks; Africa; Cape Province region; Namaqualand; South Africa; Southern Africa; Bushmanland; Cape Province South Africa
Abstract Numbers:87M/4906
Record ID:1987021329
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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