Significance of 87Sr/86Sr ratios in the Merensky cyclic unit of the Bushveld Complex

Kruger, Floris J; Marsh, Julian S

Title: Significance of 87Sr/86Sr ratios in the Merensky cyclic unit of the Bushveld Complex
Creator: Kruger, Floris J
Creator: Marsh, Julian S
Date Issued: 1982
Date: 1982
Type: text
Type: article
Identifier: http://hdl.handle.net/10962/133524
Identifier: vital:36986
Identifier: https://doi.org/10.1038/298053a0
Description: In a number of mafic layered intrusions, layers with platinum group element (PGE) mineralization coincide with breaks in cumulus mineral composition and isotopic variation trends through the layered sequence1,2. For example, in the Bushveld Complex in South Africa, abrupt increases in initial 87Sr/86Sr ratios occur at the UG-2 and Merensky pegmatoid (or ‘reef’) horizons, both of which are exploited for PGEs. We report here the results of a detailed Sr-isotope study across the Merensky unit and its immediate foot- and hangingwall-rocks which, when considered together with new ideas on processes operating in magma chambers3–5, suggest that magma mixing and post-cumulus infiltration of liquids displaced from below were important during crystallization of the Merensky pegmatoid.
Format: 3 pages
Format: pdf
Language: English
Relation: Nature
Relation: Kruger, F.J. and Marsh, J.S., 1982. Significance of 87Sr/86Sr ratios in the Merensky cyclic unit of the Bushveld Complex. Nature, 298(5869), pp.53-55.
Relation: Nature volume 298 number 5869 53 55 July 1982 0028-0836
Rights: Nature
Rights: Use of this resource is governed by the terms and conditions of the Nature Terms and Conditions Statement (https://www.nature.com/info/terms-and-conditions)

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