Jean Hamet, Claude-Jean Allègre; Rb-Sr systematics in granite from central Nepal (Manaslu): Significance of the Oligocene age and high 87Sr/86Sr ratio in Himalayan orogeny. Geology ; 4 (8): 470–472. doi: https://doi.org/10.1130/0091-7613(1976)4<470:RSIGFC>2.0.CO;2
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We report a precise Rb-Sr whole-rock isochron, obtained from the Manaslu granite of central Nepal, that is indicative of an age of 28 m.y. The initial 87Sr/86Sr ratio is very high, above 0.740, indicating crustal anatexis as the origin of the granite.