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Origin and Evolution of Precambrian High-Grade Gneiss Terranes, with Special Emphasis on the Limpopo Complex of Southern Africa
GSA Memoirs

Origin and Evolution of Precambrian High-Grade Gneiss Terranes, with Special Emphasis on the Limpopo Complex of Southern Africa

Author(s)
Dirk D. van Reenen
Dirk D. van Reenen
Department of Geology, University of Johannesburg, Auckland Park, South Africa
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Jan D. Kramers
Jan D. Kramers
Department of Geology, University of Johannesburg, and School of Geosciences, University of the Witwatersrand, Johannesburg, South Africa
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Stephen McCourt
Stephen McCourt
School of Geological Sciences, University of KwaZulu Natal, Durban, South Africa
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Leonid L. Perchuk
Leonid L. Perchuk
Department of Petrology, Moscow State University, and the Institute of Experimental Mineralogy, Russian Academy of Sciences, Chernogolovka, Moscow District, Russia
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Geological Society of America
Volume
207
DOI:
https://doi.org/10.1130/MEM207
Copyright:
© 2011 Geological Society of America
Attribution: You must attribute the work in the manner specified by the author or licensor (but no in any way that suggests that they endorse you or your use of the work). Noncommercial - you may not use this work for commercial purpose. No Derivative works - You may not alter, transform, or build upon this work. Sharing - Individual scientists are hereby granted permission, without fees or further requests to GSA, to use a single figure, a single table, and/or a brief paragraph of text in other subsequent works and to make unlimited photocopies of items in this journal for noncommercial use in classrooms to further education and science.
ISBN print:
9780813712079
Publication date:
February 01, 2011
Book Chapter

Microstructures of melt-bearing regional metamorphic rocks

Author(s)
R.H. Vernon
R.H. Vernon
Department of Earth & Planetary Sciences and National Key Centre for Geochemical Evolution and Metallogeny of Continents, Macquarie University, Sydney, 2109, Australia
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Doi:
https://doi.org/10.1130/2011.1207(01)
  • Published:
    February 01, 2011

The most reliable microstructural criterion for the former presence of felsic melt in regional migmatites is a three-mineral (quartz, K-feldspar, and sodic plagioclase) aggregate in veinlets. Several other criteria are potentially reliable, namely: (1) euhedral crystals of feldspar (precipitated from liquid) or peritectic minerals (e.g., garnet, cordierite, orthopyroxene, K-feldspar) lining felsic “protoleucosomes”; (2) inclusion-free euhedral overgrowths of feldspar (precipitated from liquid) or peritectic minerals (e.g., garnet, cordierite, orthopyroxene, K-feldspar) on residual grains of the same minerals with abundant inclusions in the mesosome; (3) aligned, euhedral feldspar crystals; (4) simple twinning in K-feldspar; (5) dihedral angles of ≤ 60° subtended where...

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