阿尔泰山南缘白垩纪以来的剥露历史和古地形恢复.pdf

31 3 Vol. 31, No. 3: 412~ 424 2012 5 ACTA PETROLOGICA ET MINERALOGICA May, 2012 刘海涛, 袁万明, 田朋飞, 薛 斌, 宋 高, 赵文菊 ( , 100083) : , 11 , 991~ 43 Ma 0050 mm/ a, : ( 120~ 5 Ma) , 0044 mm/ a; ( 5- 0~ 50 Ma) , 00 0 mm/ a; ( 20- 15 Ma~ ) , 0081 mm/ a, ( 120 Ma) , 5 km, 08 km 1 5~ 50 Ma , - -; Kohistan-Dras ; : ; ; -; ; : P512. 2; P542 :A : 1000-6524( 2012) 03-04 12- 13 Denudation and exposure history and paleotopographic reconstruction of the southern margin of the Altay Mountains since Cretaceous LIU Ha-i tao, YUAN Wan-ming, TIAN Peng-fei, XUE Bin, SONG Gao and ZHAO Wen-ju ( Science Research Institute, China University of Geosciences, Beijing 100083, China) Abstract: Altay is an important part of the Central Asian Orogenic Belt, and also the largest accretion orogen in the world. At present, scholars both in China and abroad are focusing their Altay studies on the evolution of var- ious stages of orogenic movements as w ell as geochemical and geochronological time constraints on the orogenic activities. In contrast, the study of the M esozoic-Cenozoic cooling history is relatively insufficient. To carry out the researches on the cooling as w ell as denudation and exposure history of the post-orogenic stage of the Altay orogenic belt is of great importance in the in-depth understanding of the formation of a large mountain range after the evolutionary stage. Researches on the post-orogenic uplift of the cooling as well as denudation and expo- sure history about Altay orogen are of great significance in that it make researchers obtain in-depth understanding of the formation of a large mountain range after the evolutionary stage. With the improvement of the fission track analysis techno