Abstract
The apatite (U-Th)/He dating results of 13 granitic samples collected in Nanjiang-Nanzheng transect are used to systematically study Micang Shan's exhumation and thermo-tectonic evolution.While taking into consideration of the influence of the sample's cooling rates and crystal sizes on (U-Th)/He closure temperatures of respective apatites, this research also quantifies the effects of topography, heat conduction, advection and production on regional geothermal gradients.The inversion results reveal a period of rapid exhumation with an average rate of ～70 m/Ma in the southern sedimentary area of Micang Shan since about 50 Ma B.P., which removed above 3 km-thick sub-surface rock in the region;the Guangwushan Complex in the middle part of Micang Shan-Hannan Uplift experienced a fast exhumation event at ～90 Ma B.P.with an exhumation rate of 75 m/Ma;the northern Hannan Uplift was exhumed to the surface with a fast rate above 40 m/Ma before ～100 Ma B.P., and then slowly with an average exhumation rate of ～10 m/Ma.The whole research region, Micang Shan-Hannan Uplift experienced a very slow exhumation with an average rate of 10～25 m/Ma during 90～50 Ma B.P.
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