祁连山北缘早中更新世新构造运动的地层记录  

Stratigraphic Records of Early-mid Pleistocene Tectonic Events in Northern Qilian Mountains

作　　者：赵志军[1] 史正涛[2] 方小敏[2] 

机构地区：[1]南京师范大学地理科学学院,江苏南京210097 [2]兰州大学西部环境教育部重点实验室地理科学系,甘肃兰州730000

出　　处：《兰州大学学报（自然科学版）》2001年第6期92-98,共7页Journal of Lanzhou University(Natural Sciences)

基　　金：国家重点基础研究发展规划青藏 (G19980 4 0 80 9) ;中国科学院重大 (KZ95 1- A1- 2 0 4 ;KZ95 T-0 6 );国家自然科学基金重点 (497310 10 )资助项目

摘　　要：已有研究发现在早、中更新世之交 ,青藏高原及其邻区发生重大的构造隆升事件 ,并命名为“昆仑—黄河运动”,简称昆黄运动 .河西走廊是青藏高原北缘祁连山的山前凹陷 .在走廊西端酒西盆地老君庙背斜开展的古地磁和 ESR年代学研究发现祁连山在约 1.2 3Ma BP发生构造活动 ,造成玉门砾岩内部出现不整合 ;第 2幕强烈活动发生于 0 .93～ 0 .84 Ma,造成了河西走廊地区酒泉砾石层和玉门砾岩区域性角度不整合 .这两次构造运动在时间上与昆黄运动吻合 ,因此 ,本研究提供了昆黄运动在青藏高原北部表现的新证据 .Various evidence have shown that the Qinghai-Tibetan Plateau and its adjacent region experienced an intensive uplift during the transition between early to mid Pleistocene, namely the Kunlun-Huanghe Movement. The Hexi Corridor was the foreland depression of the northern boundary of the plateau.Our dating of the Jiuquan Gravel and the Yumen Conglomerate along the Laojunmiao anticline by paleomagnetic and ESR methods indicates that the two tectonic events happened at about 1.23 Ma and 0.93~0.84 Ma respectively. The former triggered a slight angular deformation within the Yumen Conglomerate and the latter induced a regional angular discontinuity between the Jiuquan Gravel and the underlying Yumen Conglomerate. This work gives a further support to the pervasive influence of the Kunlun-Huanghe Movement.

关 键 词：青藏高原 昆仑-黄河运动 酒西盆地 祁连山 地层记录 新构造运动 

分 类 号：P546[天文地球—构造地质学] P931.2[天文地球—地质学]