Thickening of a basalt layer as a possible cause for the uplift of the Himalayas — A suggestion based on gravity data

Transverse Tectonics Feature Delineated by Modelling of Magnetotelluric Data from Garhwal Himalaya Corridor, India

“…Auden 4 first indicated the rejuvenation of the Aravalli Mountain which, he believed, extended northeastward into the Himalaya. Prolongation of the Aravalli in the NNE-SSW direction towards Garhwal is also reflected in gravity anomaly 20 . Recently, the cross-strike discontinuities in the Indian crust beneath the Himalaya have been studied by Godin and Harris 12 using gravity data.…”

Geomagnetic induction anomalies in India in relation to geology

“…The first-order structure pointed out earlier has a position and orientation which links it with the AravaUi belt. This structure coincides with the seismically active Delhi-Hardwar Ridge (Kaila and Narain, 1976) and also with a gravity feature which protrudes out from a predominant gravity pattern following the strike of the Himalaya (Qureshy, 1969). An interpretation of the positional agreement of the basement ridge, the seismicity, the gravity anomaly and the electrical conductivity structure is done in terms of a localized zone of tectonic activity in this part of the Indian plate as it dips below the Himalaya.…”

“…geomagnetic induction anomaly in short-period events and daily variation data respectively and established the existence of a coastal effect at Alibag. Later, Srivastava and Sanker Narayan (1967, 1969, Srivastava et al (1974a, b) and Srivastava and Prasad (1974), Nityananda et al (1975Nityananda et al ( , 1977Nityananda et al ( , 1981, Rajagopal et al (1976), Singh et al (1977), Srivastava (1977Srivastava ( , 1981, Rajaram et al (1979), Agarwal et al (1979) and Srivastava and Abbas (1980) investigated various aspects of geomagnetic induction anomalies in India. Based on detailed magnetometer array studies in India, exhaustive results have been reported by Lilley et al (1981), Thakur et al (1981) and Arora et al (1982).…”

The Himalayan Orogenic Segment

“…The general interpretation is a thickening of the crust towards the north (~ Qureshy, 1969). However, calculating the anomalies that would result from isostatic compensation of the topography shows that the IndoGangetic basin is overcompensated -deficit of mass, and that the Himalayan range is undercompensated -excess of mas s (Lyon-Caen & Mol nar, 1985).…”