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  • 1
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    Convection pattern and stress system under the African plate (1977)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Studies on tectonic forces from satellite-derived gravity data have revealed a subcrustal stress system which provides a unifying mechanism for uplift, depression, rifting, plate motion and ore formation in Africa. The subcrustal stresses are due to mantle convection. Seismicity, volcanicity and kimberlite magmatism in Africa and the development of the African tectonic and magnetic features are explained in terms of this single stress system. The tensional stress fields in the crust exerted by the upwelling mantle flows are shown to be regions of structural kinship characterized by major concentration of mineral deposits. It is probable that the space techniques are capable of detecting and determining the tectonic forces in the crust of Africa.
    Keywords: GEOPHYSICS
    Type: Physics of the Earth and Planetary Interiors; 15; 1, Se; Sept
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Mantle convection pattern and subcrustal stress field under Asia (1978)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Satellite tracking and surface gravity data are used to model the subcrustal stress fields in the terrestrial mantle beneath Asia; the results permit interpretation of the tectonic and seismic systems in China. The east and west China blocks, together with five seismic zones, are identified and related to metallogenic domains on the Chinese mainland. In addition, it is shown that the subcrustal stresses beneath China are arranged perpendicularly to the major fault systems and seismic belts. Stress calculations indicate a notable zone of compression in north China, associated with the Shansi Graben, the Linfen Basin Systems and, possibly, the high seismicity of the region.
    Keywords: GEOPHYSICS
    Type: Physics of the Earth and Planetary Interiors; 16; 3, Ap; Apr. 197
    Format: text
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    NASA TECHNICAL REPORTS
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