对祁连山北缘榆木山隆起的质疑  

QUERY TO THE YUMUSHAN UPLIFT ON THE NORTH MARGIN OF QILIAN MOUNTAIN

作　　者：潘宏勋[1] 葛肖虹[1] 刘俊来[1] 

机构地区：[1]长春科技大学地球科学学院,吉林长春130026

出　　处：《长春科技大学学报》2000年第1期9-13,共5页Journal of Changchun University of Science and Technology

基　　金：国家自然科学基金!资助项目(49772157)

摘　　要：榆木山地块位于祁连山北缘，介于酒东、民乐盆地之间，它们共同属于祁连山褶皱带北缘北北西向的山前坳陷带。长期以来一直认为它是燕山运动晚期形成的北北西向分割酒东、民乐盆地的断隆。依据对梨园河一带榆木山西缘断裂的识别，并结合对地块的构造属性及相邻两盆地中、新生代沉积演化特征的分析，对“榆木山断隆”的构造属性提出质疑，认为它可能是祁连山北缘断裂系向北东叠瓦状逆冲作用形成的推覆片体。这一认识将为河西走廊盆地的油气、水资源评价提出新的勘探思路。Yumushan block on the north margin of Qilian mountain, with Jiudong basin and Minle basin to the west and east respectively, belongs to the fore-land depression in NNW direction at the north margin of the Qilian mountain fold belt. The Yumushan block has been thought of as a fault-uplift, which separates the two basins formed during late Yanshanian orogeny. However, the recognition of fault zones at the western margin of the Yumushan block, and the tectonic and sedimentary analyses of the Yumushan block and the basins, cast doubts to the tectonic property of the block. It is suggested that the two basins be derived from an united large basin at least during Mesozoic and the Yumushan block be nappe sheet formed due to NE imbricate thrusting on the north margin fault zone of the Qilian mountain. This proposal would provide valuable clues to further exploration of oil-gas and water resources in Hexi corridor basin belt.

关 键 词：榆木山推覆片体 祁连山褶皱 推覆构造 

分 类 号：P542.2[天文地球—构造地质学]