Skip to Main Content
GEOREF RECORD

Grain-size variations of cumulus plagioclase in the Main Zone of the Bushveld Complex

Wolfgang D. Maier and Andrew A. Mitchell
Grain-size variations of cumulus plagioclase in the Main Zone of the Bushveld Complex
European Journal of Mineralogy (February 1995) 7 (1): 195-204

Abstract

At Union Section in the NW Bushveld complex the main zone is approximately 2700 m thick; borehole core and surface traverses yielded 150 samples of cumulate rock which were examined for grain sizes of cumulus plagioclase. Grain size and geochemical variation is coupled in large parts of the main zone in that the smaller grain sizes are associated with the more primitive orthopyroxenes. At the same time, grain size varies independently of modal proportions. The data indicate that grain-size variation is mainly controlled by differentiation and magma replenishment. Postcumulus textural modification of the cumulates is shown to be of relatively minor importance.


ISSN: 0935-1221
Serial Title: European Journal of Mineralogy
Serial Volume: 7
Serial Issue: 1
Title: Grain-size variations of cumulus plagioclase in the Main Zone of the Bushveld Complex
Affiliation: Rhodes University, Department of Geology, Grahamstown, South Africa
Pages: 195-204
Published: 199502
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 38
Accession Number: 1995-021752
Categories: Igneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., 2 tables, sketch map
S28°10'00" - S22°04'60", E24°40'00" - E32°02'60"
Secondary Affiliation: University of Durban-Westville, ZAF, South Africa
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United KingdomTwickenhamUKUnited Kingdom
Update Code: 199508
Close Modal

or Create an Account

Close Modal
Close Modal