Heat flow pattern and lateral variations of lithosphere strength in China mainland: constraints on active deformation

Details Heat flow pattern and lateral variations of lithosphere strength in China mainland: constraints on active deformation Heat flow pattern and lateral variations of lithosphere strength in China mainland: constraints on active deformation

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pepi..126..121w&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 126, Issue 3-4, p. 121-146.

Physics

10

Scientific paper

On the basis of 723 heat flow measurements in China mainland and over 1500 data adopted from the global heat flow data set (cf. [Rev. Geophys. 31 (1993) 267]), we compiled the heat flow map of China mainland and its adjacent area, to exhibit overall variation of heat flow pattern in China mainland. Nineteen profiles of lithospheric strength were constructed for representative tectonic units. Significant difference exists between eastern and western China in spatial pattern of heat flow. Divided by 105°E meridian, heat flow values in eastern China show a westward decreasing trend; and a northward variation is observed in western China. The lateral variation in lithospheric strength corresponds to the heat flow variation, and there is a generally reverse relation between heat flow and lithospheric strength in China mainland. The lithospheric strength of Tibet is much lower than its neighboring regions due to a thick crust. The mosaic pattern of active deformation in China mainland results from lateral rheological heterogeneity. The very weak lower crust beneath high heat flow belts may play an important role in the present deformation processes. The good coincidence between low strength domains and active seismic zones demonstrates the intrinsic relation between strength heterogeneity and regional seismicity pattern in China mainland.

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