现代地质Issue(1)：98-108,11.
内蒙古狼山山前台地成因及其新构造运动意义
Genesis of Piedmont Terraces and Its Neotectonic Movement Significance in Langshan Mountain Area,Inner Mongolia
摘要
Abstract
Langshan Mountain is located in the western segment of Yinshan orogenic belt and the northwestern margin of the Hetao rift zone in Inner Mongolia.Piedmont faults and tectonic uplifts in this region developed widely since the Late Cenozoic.The research on the tectonic uplift process of Langshan Mountain since the Late Pleistocene has significance in having a good knowledge of the formation and evolution mechanism of Hetao rift zone and the influence of the uplift process to the paleogeographic framework of Hetao basin.The sedimentologi-cal,geomorphological and geochronological study of the piedmont terraces in Wenggeleqige and Ulaan Ovoo,in-dicates that T1 terrace formed at 47.4 kaB.P. is characterized by lacustrine deposits from Hetao megalake,and T2 terrace developed at 69 kaB.P. is characterized by fluvial deposits which may be the products of the Yellow River when it flows through the pediment of Langshan Mountain.The analysis on characteristics of terraces shows that the two terraces are mainly tectonic genesis.Therefore,the two terraces recorded the rapid uplift process in Langshan Mountain after 69 kaB.P.Between 69 kaB.P. and 47.4 kaB.P. the time-averaged uplift rates in Wenggeleqige and Ulaan Ovoo were 1.34 m/ka and 1.25 m/ka,respectively,and the uplift rates were 0.81 m/ka and 1.1 8 m/ka during the past 47.4 kaB.P.,respectively suggesting that the uplift rate have a de-creasing trend in the southwest part of Langshan Mountain (Wenggeleqige region).Since the late Late Pleisto-cene (Qp3-2 ),the rapid uplift of the Langshan Mountain led to east moving of the Yellow River continuously by the evidence of the ancient channel on Hetao plain.The research on the lake terraces in Langshan Mountain fur-ther confirmed the existence of the Hetao megalake in Late Pleistocene.关键词
内蒙古狼山/山前台地/构造隆升/黄河迁移/河套古大湖/晚更新世(Qp3 )Key words
Langshan Mountain in Inner Mongolia/piedmont terrace/tectonic uplift/migration of the Yellow River/Hetao megalake/Qp3分类
天文与地球科学引用本文复制引用
何泽新,张绪教,贾丽云,武法东,周轶群,鲍淑燕,包智强,殷志刚,郭斌..内蒙古狼山山前台地成因及其新构造运动意义[J].现代地质,2014,(1):98-108,11.基金项目
内蒙古国土资源厅“2009年国家级地质遗迹保护”项目（1209010712908）的专题“巴彦淖尔狼山地区新构造运动与河套平原形成演化关系初步研究”；中国地质调查局“青藏高原与贝加尔裂谷动力学背景与古地磁响应”项目（1212011120182）。 （）
