米仓山-汉南隆起白垩纪以来的剥露作用：磷灰石(U-Th)/He年龄记录

对米仓山南江-南郑剖面上的13个花岗岩类样品进行了磷灰石(U-Th)/He测年和剥露速率计算，分析过程综合考虑了样品冷却速率、晶体大小等因素对磷灰石(U-Th)/He封闭温度的影响和地形起伏、岩体热传导、热对流及放射性元素生热等因素对地温场的影响.研究表明，米仓山南部沉积变形区自~50 Ma以来发生快速剥露 (剥露速率为~70 m/Ma)，新生代以来的剥蚀量超过了3 km；中部光雾山杂岩体记录了~90 Ma时一次快速剥露事件(剥露速率>75 m/Ma)；北部汉南隆起区~100 Ma以前以快速剥露为特点，平均剥露速率>40 m/Ma,此后转为缓慢剥露.整个米仓山-汉南隆起区在90~50 Ma基本处于缓慢剥露状态，平均剥露速率仅有10~25 m/Ma.

The exhumation evolution of the Micang Shan-Hannan uplift since Cretaceous:Evidence from apatite(U-Th)/He dating

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.