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ORTHOPYROXENE plus SILLIMANITE PREDATING SAPPHIRINE plus QUARTZ: A RARE CASE OF ULTRAHIGH-TEMPERATURE METAMORPHISM FROM THE CENTRAL ZONE, LIMPOPO COMPLEX, SOUTH AFRICA

Belyanin, Georgy A and Rajesh, HM and Sajeev, Krishnan and Van Reenen, Dirk D (2012) ORTHOPYROXENE plus SILLIMANITE PREDATING SAPPHIRINE plus QUARTZ: A RARE CASE OF ULTRAHIGH-TEMPERATURE METAMORPHISM FROM THE CENTRAL ZONE, LIMPOPO COMPLEX, SOUTH AFRICA. In: CANADIAN MINERALOGIST, 50 (5). pp. 1153-1163.

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Official URL: http://dx.doi.org/10.3749/canmin.50.5.1153

Abstract

Sapphirine + quartz and orthopyroxene + sillimanite occur in garnet from an Mg-Al granulite from the Central Zone of the Limpopo Complex in South Africa. Textural evidence and a chemical gradient in garnet between the zones preserving the inclusions argue for the formation of sapphirine + quartz after orthopyroxene + sillimanite. Petrological observations, pressure-temperature phase diagrams, and compositional and model proportion results on isopleths indicate the sapphirine + quartz + garnet + orthopyroxene (high-Al) assemblage as the peak metamorphic assemblage (similar to 1050 degrees C at similar to 8.5 kbars), whereas orthopyroxene (low-Al) + sillimanite represents the prograde stage (at ca. 900 degrees C at similar to 8.5 kbars). Our report of these two diagnostic ultrahigh-temperature mineral assemblages in garnet from an Mg-Al granulite is unique, given the rare occurrence of sapphirine + quartz postdating orthopyroxene + sillimanite assemblage in granulites.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to MINERALOGICAL ASSOC CANADA, CANADA
Keywords: Sapphirine plus quartz;orthopyroxene plus sillimanite;high-Al orthopyroxene;Mg-Al granulite;ultrahigh-temperature metamorphism;Limpopo Complex
Department/Centre: Division of Mechanical Sciences > Centre for Earth Sciences
Depositing User: Francis Jayakanth
Date Deposited: 15 Mar 2013 12:26
Last Modified: 15 Mar 2013 12:26
URI: http://eprints.iisc.ac.in/id/eprint/46090

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