Magnesite Mineralisation Along the Chamba Thrust, Himachal Himalaya : Structural Control and Depositional Environment Using Fluid Inclusions

The study reports magnesite mineralisation along the Chamba Thrust. The Tethyan rocks occurring south of the Higher Himalaya have translated along the Chamba-Thrust over the Higher Himalayan Crystallines and the Chail Thrust Sheet. Localized occurrences of magnesite along the Chamba Thrust are from Jiuni of Brahmour and Bindrabani of the Pangi valley areas. The fluid inclusion studies of magnesite and dolomite, indicate that the fluid involved in the genesis of magnesite was hot saline in nature at about 200°C to 275°C. The magnesite is formed from the reaction of this fluid with the limestone/dolomite during thrusting.