Some geochemical constraints upon models for the crystallization of the upper critical zone-main zone interval, northwestern Bushveld complex

Eales, Hugh V; Marsh, Julian S; Mitchell, Andrew A; de Klerk, William J; Kruger, Floris J; Field, Matthew

Title: Some geochemical constraints upon models for the crystallization of the upper critical zone-main zone interval, northwestern Bushveld complex
Creator: Eales, Hugh V
Creator: Marsh, Julian S
Creator: Mitchell, Andrew A
Creator: de Klerk, William J
Creator: Kruger, Floris J
Creator: Field, Matthew
Date Issued: 1986
Date: 1986
Type: text
Type: article
Identifier: http://hdl.handle.net/10962/136044
Identifier: vital:37331
Identifier: https://doi.org/10.1180/minmag.1986.050.358.03
Description: Ratios between elements Mg, Fe, Co, Cr, Ni, V, and Sc are consistently different in mafic rocks of the upper critical zone, and those above the Bastard unit. Within the 300 m section above the Merensky Reef, 87Sr/86Sr ratios increase from c.0.7063 to c.0.7087, irrespective of rock type. Decoupling of Mg/(Mg + Fe2+) ratios and the Ca contents of plagioclase, and wide variations in the proportions of anorthosite within the Bastard, Merensky, and Merensky Footwall units, are inconsistent with anorthosite formation by simple fractional crystallization of magma batches of limited volume.
Format: 16 pages
Format: pdf
Language: English
Relation: Mineralogical Magazine
Relation: Eales, H.V., Marsh, J.S., Mitchell, A.A., De Klerk, W.J., Kruger, F.J. and Field, M., 1986. Some geochemical constraints upon models for the crystallization of the upper critical zone-main zone interval, northwestern Bushveld complex. Mineralogical Magazine, 50(358), pp.567-582.
Relation: Mineralogical Magazine volume 50 number 358 567 582 December 1986 1471-8022
Rights: Authors
Rights: Use of this resource is governed by the terms and conditions Cambridge University Press Rights and Permissions Statement (https://www.cambridge.org/za/about-us/rights-permissions)

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