Ultrahigh-temperature metamorphism from an unusual corundum+orthopyroxene intergrowth bearing Al–Mg granulite from the Southern Marginal Zone, Limpopo Complex, South Africa View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2012-04-22

AUTHORS

G. A. Belyanin, H. M. Rajesh, K. Sajeev, D. D. Van Reenen

ABSTRACT

The Southern Marginal Zone of the Limpopo Complex is composed of granite-greenstone cratonic rocks reworked by a Neoarchean high-grade tectono-metamorphic event. Petrographic and mineral chemical characterization of an Al–Mg granulite from this zone is presented here. The granulite has a gneissic fabric with distinct Al-rich and Si-rich layers, with the former preserving the unusual lamellar (random and regular subparallel) intergrowths of corundum and symplectic intergrowth of spinel with orthopyroxene. The Al-rich layer preserves mineral assemblages such as rutile with orthopyroxene + sillimanite ± quartz, Al-rich orthopyroxene (~11 wt%), spinel + quartz, and corundum in possible equilibrium with quartz, while the Si-rich layer preserves antiperthites and orthopyroxene + sillimanite ± quartz, all considered diagnostic of ultrahigh-temperature metamorphism. Application of Al-in-opx thermometry, ternary feldspar thermometry and construction of suitable pressure–temperature phase diagrams, compositional and model proportion isopleth results indicate P–T conditions as high as ~1,050–1,100 °C, and ~10–12 kbars for the Al–Mg granulite. Our report of ultrahigh-temperature conditions is significant considering that the very high temperature was reached during decompression of an otherwise high-pressure granulite complex (clockwise P–T path), whereas most other ultrahigh-temperature granulites are linked to magma underplating at the base of the crust (counterclockwise P–T path). More... »

PAGES

457-475

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s00410-012-0747-3

DOI

http://dx.doi.org/10.1007/s00410-012-0747-3

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1052683727


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