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The Minastira peraluminous granite, Puno, southeastern Peru: a quenched, hypabyssal intrusion recording magma commingling and mixing

Published online by Cambridge University Press:  05 July 2018

Daniel J. Kontak  and
Alan H. Clark
Daniel J. Kontak
Affiliation:
Department of Geological Sciences, Queen's University, Kingston, Ontario, Canada K7L 3N6
Alan H. Clark
Affiliation:
Department of Geological Sciences, Queen's University, Kingston, Ontario, Canada K7L 3N6
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Abstract

The Minastira granite, a c. 25 Ma subvolcanic plug of fine-grained granitic rock in the Cordillera Oriental of SE Peru, has preserved textures indicative of a history involving mixing of at least two magmas, a volumetrically dominant felsic component and a less voluminous mafic one. The felsic component is represented by variably fractured, altered and embayed crystals of quartz, feldspar, biotite with minor coarsegrained melt- and fluid-inclusion rich apatite, and possible cordierite (now a pseudomorphous Fe-Mg phase), whereas the mafic component is represented by calcic plagioclase. The process of magma mixing is reflected by: (1) ubiquitous sieved-textured plagioclase with complex textural relationships; (2) a large range in plagioclase compositions with reversals and spike patterns in profiles; (3) embayed and internally fractured (thermal shock?) quartz; (4) the rare occurrence of pyroxene coronas on quartz; and (5) textures within biotite suggestive of its incipient breakdown. The lack of mafic enclaves indicates that physico-chemical conditions of the mixing were conducive to homogenization (i.e. chemical diffusion) and a superficially homogeneous rock is now observed. The association of glomeroclasts of crystals originating from both the mafic and felsic end members and a quenched quartz-feldspar matrix indicate that the mixing occurred in an underlying magma chamber.

Keywords

graniteperaluminousmagma mixingMinastiraPeru
Type
Petrology
Information
Mineralogical Magazine , Volume 61 , Issue 409 , December 1997 , pp. 743 - 764
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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Footnotes

1

Present address: Nova Scotia Department of Natural Resources, P.O. Box 698, Halifax, Nova Scotia, Canada B3J 2T9.

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