THE LATE CENOZOIC DEFORMATION OF THE WUSUNSHAN MOUNTAIN IN THE YILI BASIN AND ITS SIGNIFICANCE

During the Late Cenozoic,the Central Tianshan Mountain had undergone strong tectonic event(s) from the direct northward compression of the Southern Tianshan Mountain.In this environment,the Wusunshan Mountain uplifted in the center of the Yili basin,which resulted in the dismemberment of the former basin.The deformation front of the southern Tianshan mountain is located along the northern Wusunshan mountain fault.This fault now is one important active fault in the Yili basin.About 16km shortening resulting from this thrust fault was obtained.Now the sub-Yining basin in the north of the Yili basin is undergoing combined compression from the Wusunshan Mountain to the south and northern Tianshan mountain to the north,the basin reduced gradually.The sub-Zhaosu basin to the south as one piggy-back basin is now incorporated into the thrust belt of the southern Tianshan mountain,and the sub-Yining basin to the north underthrusts the Wusunshan Mountain to the south and northern Tianshan mountain to the north.