The petrology and petrogenesis of some muscovite granite sills from the Barousse Massif,Central Pyrenees |
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| Authors: | N B W Harris |
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| Institution: | 1. Department of Mineralogy and Petrology, Cambridge
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| Abstract: | The mineralogy, petrology and Rb-Sr isotope compositions of muscovite granite sills and associated pegmatites from the Barousse Massif, Central Pyrenees, are described. The petrogenesis of the granites is discussed with respect to their structure, mineral assemblages, mineral compositions and initial 87Sr/86Sr ratio. It is concluded that the muscovite granite sills have been intruded as magma, formed from the partial melting of continental crust at 276 million years. Progressive crystallisation of the siliceous magma has concentrated the aqueous phase in the remaining melt, and the associated pegmatites are the final expression of the crystallising intrusion. |
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