Abstract
The collision of the Indian plate and the Eurasian plate created shortening and imbrications with thrusting and faulting which influences northward tectonic movement. This plate movement has divided the Himalaya into four parts, viz. Outer Himalaya, Lesser Himalaya, Greater Himalaya, and Tethys Himalaya. The crystalline basement rock plays an imperative role for structural and tectonic association. The study has been carried out near Rishikesh-Badrinath neighborhood in the northwestern part of the Himalayan girdle with multifarious tectonic set up with thrusted and faulted geological setting. In this study area, 3D Euler deconvolution, horizontal gradient analysis, tilt angle (TILT) and horizontal tilt angle (TDX) analysis have been carried out using gravity data to delineate the subsurface geology and heterogeneity in the northwestern part of Himalaya. The Euler depth solutions suggest the source depth of about 12 km and various derivative analyses suggest the trend of the delineation thrust-fault boundaries along with the dip and strike direction in the study area.
Highlights
The area of study, situated in the Rishikesh-Badrinath, extends from 30° N to 31.2° N and 78° E to 80° E (Fig. 1)
Automatic basement depth study has been carried out using 3D Euler deconvolution of gravity data
These cluster points derived from the Euler’s source depth calculation suggest the shallower depth < 8 km and deeper depth > 12 km
Summary
The area of study, situated in the Rishikesh-Badrinath, extends from 30° N to 31.2° N and 78° E to 80° E (Fig. 1). The Lesser Himalaya is subdivided by the MBT to the south and the Main Central Thrust (MCT) to the north and a thick pile of highly folded Proterozoic sedimentary strata with older crystalline rocks (Gansser 1964). The study area is located near Rishikesh-Badrinath neighborhood in the north-western part of the Himalayan girdle with multifarious tectonic set up with thrusted and faulted geology. Ghosh and Singh (2014) studied the Indian crystalline basement depth in the Dehradun-Badrinath area using spectral analysis and 2D Euler deconvolution technique of gravity data along the few selected profiles. The horizontal gradient, tilt angle derivative (TILT), horizontal tilt angle derivative (TDX), and Euler deconvolution (ED) of gravity data have been used to delineate the subsurface geology, identifying the subsurface heterogeneity and crystalline basement depth in the study area. Source edge detection with dip and strike orientation have been derived from gravity grid data (Cordell and Grauch 1982, Blakely and Simpson 1986, Grauch and Cordell 1987)
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