Subsurface structure derived from detailed gravity and magnetic investigations along the Pala-Maneri traverse of the Main Central Thrust,NW Himalaya |
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| Authors: | T Seshunarayana B Rajendra Prasad A S S S R S Prasad D Mysaiah |
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| Institution: | (1) GeoForschungsZentrum Potsdam, Telegrafenberg C426, 14473 Potsdam, Germany;(2) Institute of Geophysics, National Academy of Sciences of Ukraine, 03680 Kiev, Ukraine; |
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| Abstract: | A detailed, integrated gravity and magnetic study across the Main Central Thrust (MCT) along the Pala-Maneri traverse in Uttaranchal,
NW Himalaya was carried out. The gravity data was acquired using a CG-3 gravity meter with an accuracy of 0.005 mGal, while
magnetic data was acquired using a proton precession magnetometer with a station interval of 20 m. Data was collected along
a 11.7 km, NE-SW traverse from Pala to Maneri along the proposed route of a hydroelectric headrace tunnel. The measured variation
in the gravity field was approximately 70 mGal, with two prominent highs recorded at distances of 0.5 km, 7.5 km and lows
at 3.0 km, 10.5 km from Maneri. The gravity highs can be attributed to presence of high-density rocks along the thrust planes.
The sharp gravity low recorded at 10.5 km distance possibly indicates a sympathetic fault of the MCT that is highly saturated
with fluids (water). The broad gravity low between 2.5 km and 4.0 km distance is likely to represent the gravity signature
of the MCT itself. The measured variation in the magnetic field was approximately 285 nT. The associated gravity and magnetic
signatures located several faults along the traverse including presence of the MCT at Kumaltigad. |
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