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:研究表明 ,北山造山带马鬃山中间隆起带上的盐池东—草呼勒哈德一带 ,断块状分布着前长城系结晶基底敦煌岩群 (AnChD) ,斜长角闪岩等时线年龄为 2 839± 163Ma和 1981± 116Ma。表壳岩具碎屑岩—中基性火山岩—碳酸盐岩建造。前后经历了吕梁期、晋宁期、加里东期和海西期 4期变形变质旋回 ,吕梁期为主变质期 ,峰期条件为P =0 4 3～ 0 4 9GPa ,T =4 30～ 550℃ ,变质作用P -T -t -D轨迹趋势显示陆壳碰撞隆升
: Studies have shown that the faulted blocks of Dunhuang Group (AnChD) and plagioclase amphibolite in the former member of the Great Wall, such as the East China Sea in the middle of the Mazongshan uplift in the Beishan orogenic belt, 2 839 ± 163 Ma and 1981 ± 116 Ma. Case Rock Clastic - Mesozoic volcanic - carbonate rock construction. Before and after experienced the Lvliang period, Jinning period, Caledonian and Hercynian 4 deformation metamorphism cycle, Luliang stage of the main metamorphic period, the peak conditions for the P = 0 4 3 ~ 0 49GPa, T = 4 30 ~ 550 ℃, metamorphism of P-T-t-D trajectory trend shows the continental crust collision uplift