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《Geotectonica Et Metallogenia》 1992-04
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ISOSTATIC GEOID ANOMALIES AND LITHOSPHERIC STRUCTURE OF THE QINGHAI-XIZANG PLATEAU—NORTH INDIAN OCEAN REGION

CHEN Shengzao (Institute of Geophysics, S.S.B., Beijing, 100012)  
This paper deals with the isostatic geoid anomalies and lithospheric structure of the Qinghai-Xizang plateau-Northern Indian Ocean region, and also the subduction mechanism of the Indian plate underthrusting beneath the Himalayan collision zone and the uplift cause of the Qinghai-Xizang plateau. The classical Airy and Pratt models give geoid anomalies of comparable magnitude which are closer to each other in the continental area than in the ocean. The crustal density distribution, derived from the geoid difference between the spherical harmonics of degree 180 and 20, displays wave-like features of latitudinally alternating and longitudinally extending positive/negative variations, which are related to the stress-compressing/relaxing (or extending) of the lithospheric material in horizontal movement. With this background of the horizontal movement, the compensation principle of the Airy isostatic model can be redescribed as a compensation of positive and negative vertical dipole moments of local density distribution. The lithosphere thickens continentalwards from 60km±in the Indian Ocean to 110-130 km, locally reaching 140 km, in the central part of the Qinghai-Xizang plateau. The Himalayan collision zone is a transitional zone of deep structure and geophysical anomalies between the Indian and the Tibetan plates, and the collision mechanism belongs to a type of subdueting (northwards)/thrusting (southwards) action.
【Fund】: 博士后科学基金
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