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Mineralogical Magazine; December 2002; v. 66; no. 6; p. 929-939; DOI: 10.1180/0026461026660068
© 2002 Mineralogical Society of Great Britain and Ireland
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Disequilibrium textures in the Leinster Granite Complex, SE Ireland: evidence for acid-acid magma mixing

S. E. Grogan and R. J. Reavy

Department of Geology, National University of Ireland, Cork, Ireland

* E-mail: sue_grogan{at}yahoo.com

The LGC (Leinster Granite Complex) in SE Ireland consists of five plutons or Units. Units 1 and 3 display complex magmatic disequilibrium textures described here for the first time. The textures indicative of disequilibrium include boxy cellular plagioclase, oscillatory zoning, calcic spike zones and combinations of these within individual plagioclase feldspar crystals. The textures are interpreted as having formed in a dynamic magmatic environment which facilitated acid-acid mixing on a variety of scales and at a variety of stages between source to emplacement. It is proposed that the restricted distribution of disequilibrium textures was a result of the complex strain regime operating within the crust during assembly of Units 1 and 3.

KEYWORDS: granite, Leinster, SE Ireland, magma mixing, disequilibrium, microtextures




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