Petrochemical Studies of the Lansdowne Granite Gneiss, Lesser Himalaya, India

Abstract

Petrochemical studies on fourteen representative samples of the Lansdowne Granite Gneiss indicate close compositional uniformity. Most of the analyses fall within the field of granodiorite, and lie close to the low-pressure ternary minimum in the system Qz-Or-Ab-H₂O. Inter-element relationships indicate an initial magmatic origin, with pronounced gneissosity due to later deformation.