The mantle convection pattern and force source mechanism of recent tectonic movement in China

Details The mantle convection pattern and force source mechanism of recent tectonic movement in China The mantle convection pattern and force source mechanism of recent tectonic movement in China

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pepi...28..261p&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 28, Issue 3, p. 261-268.

Physics

3

Scientific paper

The Runcorn stress equations and 2-30° harmonic coefficients of the geopotential have been applied to determine the mantle convection pattern beneath China. The pattern is compared with geophysical and geological observations and it is found that the directional change belts of mantle flows coincide with the major fault belts between tectonic units of China. The stress field generated by mantle flows, except in the Tian Shan region, also coincide with the stress field of recent tectonic movement in China. The Tarim and Junggar basins are formed by tensional stresses due to divergent mantle convection currents under northwest China. The formation of the Qinhai-Xizang (Tibet) plateau is due mainly to the compression of the Tarim block and Indian plate, caused by convergent mantle convection currents. The shear-fault belts in central China (100-105°E) are generated by the running change belt of mantle flows, a well-known N-S seismic zone. In eastern China, tensional faults, grabens, lake and sea depressions are related to the eastward displacement of continental lithosphere exerted by eastward dispersal mantle flows under this region.
This paper provides new material for further study of the force source mechanism of recent tectonic movement from the viewpoint of mantle convection currents.

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