Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6441246 | Lithos | 2011 | 16 Pages |
Abstract
⺠Careful micro-textural investigations revealed that the kyanite-bearing paragneisses from the Namche Barwa contained a proportion of trapped liquid (melt) now replaced by minerals. ⺠Phase equilibria modeling supports that the kyanite-bearing migmatites underwent peak metamorphism in the High-P granulite facies at conditions around 15 kbar and 850C. ⺠Most of the mineral compositions and of the microtextures in these rocks are related to the retrograde solidification of a melt fraction, at conditions of around 10 kbar and 800C for the investigated samples. ⺠Phase equilibria modeling predicts that for such felsic and aluminous rocks being metamorphosed along a clockwise P-T path with a peak in the High-P granulite facies , the main melting reactions occur during burial with a very low potential for decompression melting.
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Authors
C. Guilmette, A. Indares, R. Hébert,