Electromagnetic signatures of collision zones in India |
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| Authors: | T Harinarayana K Veeraswamy |
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| Institution: | 1. GERMI, Gandhinagar, Gujarat, India
2. CSIR — National Geophysical Research Institute, Uppal Road, Hyderabad, 500007, India
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| Abstract: | Indian subcontinent has experienced intense tectonic activity within the continent in the form of subduction, continent-continent collision, subduction-collision-accretion tectonics. Deep electrical signatures of intense tectonic activity are presented for three different regions: Himalayan region, Central Indian Tectonic zone and Southern Granulite terrain. Two long traverses at each region are discussed along with other geophysical data. The geoelectric sections across the Himalayan region have shown a clear northward dipping signature of the anomalous conductive features at upper to mid-crustal depths. This model gave a clear evidence for the collision and subduction processes. The profiles across the Central Indian tectonic zone constituting major east-west trending faults and mobile belts provided the evidence for the presence of mantle derived fluids at mid-crustal depths and also gave a clear evidence for the collision processes between the Bundelkhand craton and the Dharwar craton. The collision-accretion tectonic process is observed in Southern Granulite terrain of south India. Evidence for the exhumation of mantle derived fluids to the midcrustal depths has been observed along the Vattalakundu-Kanyakumari profile, while the subduction-collision-accretion processes have been observed along Kolattur-Palani geotransect. In all the three tectonically active regions, the deep electrical structure mapped from magnetotellurics, gave a clear evidence for the presence of anomalous conductive structures that can be related to active tectonic regime that has paved a way for better understanding of the evolution of the deep crust. In this paper all the earlier works in three regions with emphasis on tectonics are briefly reviewed. |
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