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Himalayan
Geology, Vol. 30 (1), 2009, pp.35-44 Printed in India
Geochemistry of granitoids from the Shyok tectonic zone near Tangtse,
Ladakh, India
D. RAMESHWAR RAO, HAKIM RAI
Wadia Institute of Himalayan Geology, Dehradun – 248 001, India
Abstract: The Tangtse granite and the associated leucocratic granite
dykes from the Shyok tectonic zone have been analyzed geochemically for
their source characterization. The Tangtse granites are metaluminous
granodiorites with biotite and hornblende as mafic constituents. The studies
suggest that the primary melts of the granodiorite were derived from mafic
lower-crust reservoir due to crustal thickening associated with arc magma
underplating. On the other hand, the leucocratic granite dykes occurring
within this granite are two mica granites. These rocks were derived from the
partial melting of felsic source such as the Tangtse granite. Such process
might have triggered by the frictional heating within the crust as a result
of tectonic activity in the region. |
