Vertical Tectonics in the Middle Himalayas: An Appraisal from Recent Gravity Data

Qureshy, M. N.; Venkatachalam, S.; Subrahmanyam, C.

doi:10.1130/0016-7606(1974)85<921:vtitmh>2.0.co;2

Cited by 29 publications

(12 citation statements)

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“…Gravity data indicate a positive anomaly below the Kashmir basin, which is attributed to the presence of magmatic rocks at depth (Qureshi, 1969;Qureshi et. al., 1974).…”

Section: Central Kashmir Fault (Ckf)mentioning

confidence: 97%

Tectonic evolution of Kashmir basin in northwest Himalayas

et al. 2015

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“…Gravity data indicate a positive anomaly below the Kashmir basin, which is attributed to the presence of magmatic rocks at depth (Qureshi, 1969;Qureshi et. al., 1974).…”

Section: Central Kashmir Fault (Ckf)mentioning

confidence: 97%

Tectonic evolution of Kashmir basin in northwest Himalayas

et al. 2015

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“…The correlation of this conductivity body, visualized as a near surface fracture zone, with gravity (QUERESHY et al, 1974) and a well defined belt of high seismicity (GAUR et al, 1985) has already been discussed in ARORA (1992a, 1992b). The third surface feature, which is incorporated primarily based on exposed geological section, is a block of 8 km thick sediments with 3 SZm resistivity on the NE corner of the profile (Fig.…”

Section: Tectonic Interpretationsmentioning

confidence: 99%

Quantitative Interpretation of Geomagnetic Induction Response Across the Thrust Zones of the Himalaya along the Ganga-Yamuna Valley.

Reddy

Arora

1993

J. geomagn. geoelec

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Geomagnetic variations, recorded through a two-phase magnetovariational study carried out along the Ganga-Yamuna valley of the Garhwal Himalaya, northwest India, are reduced to a set of induction arrows spanning a period range of 12-128 minutes. The spatial behaviour of induction response indicates that the Main Frontal Thrust is a major electrical discontinuity with enhanced conductivity to the south, beneath the Indo-Gangetic plains. Simple two-dimensional (2-D) geoelectrical models with geophysical constraints on the thickness and resistivity of the sedimentary sequences indicate that the induced currents in the Indo-Gangetic plains contribute little to the observed induction response.A full 2-D electrical resistivity model which reproduces the observed electromagnetic response, essentially requires a highly conducting layer at mid-crustal depth beneath the Indo-Gangetic Plains, becoming less conducting on underthrusting beneath the frontal Himalayan belt. This layer coincides with the brittle-to-ductile transition zone along which lie the foci of most moderate earthquakes.

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“…Fault plane solutions for these events [Fitch, 1970;Nowroozi, 1972] confirm the mechanisms to be shallow underthrusting. The Bouguer gravity anomaly fields [Durbin et al, 1972;Qureshy et al, 1974] reveal large minima elongated along the tion [Dewey and Bird, 1970]. One natural explanation of ,ranges and centered between foredeep and suture zone.…”

Section: Introductionmentioning

confidence: 99%

Thermal and mechanical models of continent-continent convergence zones

Bird¹,

Toksöz²,

Sleep³

1975

J. Geophys. Res.

177

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The thermal regimes of continent-continent convergence zones are modelled by a finite difference technique, assuming that there is some subduction of continental crust. Gravity and heat flow profiles are generated from the thermal models. Subducted crust and slab remain cool except at the upper surface where frictional heating is important. Crustal rocks may be metamorphosed or melted by friction while the plates are converging or by radioactive self-heating more than 30 m.y. after the plates have stopped. In the former case, melting requires frictional shear stresses between 500 and 2000 bars at a plate velocity of 5 cm/yr. At lower velocities the upper limit of frictional stress is greater. The total work performed in continental subduction may be minimized if the angle of underthrusting becomes more shallow, changing the location of subduction. A model for the geometry of oceanic and continental slabs in the Zagros Mountains is presented which satisfies gravity, heat flow, seismic, and geologic,constraints. Continental underthrusting is beginning along a new fracture at the edge of the Persian Gulf, isolating the Arabian continental shelf from the subduction process. Slippage along this fault is Pleistocene and probably does not exceed 30 km. Subduction of continental crust at the crush zone is probably insignificant. o KM 200 , ß ß ß \ ß

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Vertical Tectonics in the Middle Himalayas: An Appraisal from Recent Gravity Data

Cited by 29 publications

References 0 publications

Tectonic evolution of Kashmir basin in northwest Himalayas

Tectonic evolution of Kashmir basin in northwest Himalayas

Quantitative Interpretation of Geomagnetic Induction Response Across the Thrust Zones of the Himalaya along the Ganga-Yamuna Valley.

Thermal and mechanical models of continent-continent convergence zones

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