A Contribution to the Geology of Lansdowne Area, Garhwal Himalayas, India

Lansdowne granite gneiss shows a tectonic contact with the underlying Lansdowne metamorphites. The metamorphites show repeated and superposed progressive regional metamorphism. Three phases of deformation and folding are noticed. The rare assemblage, chloritoid, staurolite, kyanite, andalusite and quartz is present in the area.

Granite is metamorphosed into augen gneiss, mylonites and phyllonites. Muscovitisation, tourmalinisation and greisening indicate chemical alteration in the granitic rocks. Textural features are correlated with deformation and folding.