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On the Origin and Mechanics of Emplacement of Pegmatites and Related Bodies, Gurpa, Gaya District, Bihar
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The origin of muscovite-pegmatites in the area around Gurpa, Gaya district, Bihar (India), seems to be associated with syn- to late-kinematic migmatization and granitization connected with Satpura Orogeny. They have been formed by a process of metasomatic replacement, with the proviso, that some may be replacement 'insitu' while others may probably be a 'mobilized replacement'. Various mechanisms of emplacement are indicated, non-displacement and non-mobility being the most significant. The pegmatitic constituents were introduced into the emplacement sites from outside; but local derivation by metamorphic differentiation is not ruled out for some of them.
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