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Review on Calculation Method of Geothermal Lithospheric Thickness
Author(s): 
Pages: 123-129
Year: Issue:  3
Journal: Journal of Earch Sciences and Environment

Keyword:  lithospheric thicknessgeothermicssurface heat flowthermal conductivityheat generation ratecrustal layered structurerheological boundary layer;
Abstract: Geothermal lithospheric thickness reflects the thermal effect of lithosphere in long-time scale and the deep dynamic processes of earth.Calculation method of geothermal lithospheric thickness was introduced, preference selection and influencing factors of the method were discussed,and the differences of geothermal and other lithospheric thicknesses and their reasons were compared.The results show that calculation result of geothermal lithospheric thickness is influenced by crustal layered structure,heat generation rate and thermal conductivity of rock and surface heat flow;crustal layered structure in geological history should be speculated according to the newest research findings in petrology,petrogeochemistry,etc.;effect of heat generation rate of lithospheric mantle on the calculation result of geothermal lithospheric thickness is very significant when the surface heat flow is low (42 mW·m-2 ),change of 0.02μW·m-3 for heat generation rate of lithospheric mantle has a maximum effect on the calculated results with the change of 40 km,and change of 0.2 W·(m·K)-1 for thermal conductivity of lithospheric mantle results in the change of 15 km;when surface heat flow is 60 mW·m-2 ,change of 0.02μW· m-3 for thermal conductivity of lithospheric mantle results in the change of 3 km,and change of 0.2 W·(m·K)-1 for thermal conductivity of lithospheric mantle results in the change of 5 km;when surface heat flow increases 1 mW·m-2 ,the geothermal lithospheric thickness increases 3 km;geothermal lithospheric thickness has slightly differences with petrological and seismological lithospheric thickness,and the differences depend on the thickness of rheological boundary layer.
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