Abstract:

Based on the detailed study of seismic tomography image in South China, and according to the geotectonic environment and shape and heat  of asthenosphere upwelling, we divided the structure of lithosphereasthenosphere at the Mesozoic upper mantle of Eastern China into three types. (1)Continental platform area (North China platform and Yangtze platform): asthenosphere upwelled along paleorift; over the plume head, the granitic rocks of crust and mantle mixed and correspondingly, Au, Cu, Mo, PbZn, etc. mineralizationconcentrated regions were formed; and at the steep contact belt of asthenosphere and the thick area of lithosphere, mediatebasic complex was formed. (2)Central area of fold zone (Nanling and its extension zone): asthenosphere was “recumbent” at suitable depth, with adequate heat and in a great extent; by heat conduction, the interior of partial crust remelted, and the crustsource granitic rocks, and correspondingly, W, Sn and rare elements mineralizationconcentrated regions were formed. (3)Marginal area of fold zone (Southern Daxinganling and southern margin of South China): the mantlesource or crustmantle mixed granitic rocks, and correspondingly, Cu, Au, PbZn, Mo, Ag mineralizationconcentrated regions were formed. In conclusion, asthenosphere upwelling is the origin of the formation of Mesozoic structures, magma, and mineralizationconcentrated regions.

Key words:

Key words: geotectonic environment; asthenosphere upwelling; asthenosphere recumbent; plume body and head; mineralizationconcentrated region