准噶尔盆地北部新生代构造活动特征及其对砂岩型铀矿的控制作用  

Cenozoic Tectonic Movement and Its Control on Sandstone-type Uranium Deposits in Northern Junggar Basin

作　　者：陈正乐[1] 刘健[1] 宫红良[1] 郑恩玖 王新华 潘锦华[3] 

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]中国核工业地质局216大队,乌鲁木齐810001 [3]辽宁国土资源规划院,沈阳110031

出　　处：《地质学报》2006年第1期101-111,共11页Acta Geologica Sinica

基　　金：科技部国家基础规划"973"项目(编号2001CB409808和01CB7110013);国家自然科学基金青年基金项目(编号40102022)资助成果

摘　　要：准噶尔盆地北部顶山地区是我国寻找地浸砂岩型铀矿远景区段之一。本文在野外实地考察的基础上，结合遥感卫片解译分析，发现本区新生代构造活动主要表现为基底逆冲断裂的复活，致使地表呈现张性破裂，形成了洼地、峡谷等特殊的构造一地貌形态；并根据擦痕、节理的测量统计。结合电子自旋共振测年分析，推断本区在上新世-更新世期间存在两期构造活动：早期为近似南北向的挤压作用为主，晚期（0．14～0．43Ma）为北东-北东东的挤压作用；根据盆地新生代沉积物质充填规律和新生代构造特征，结合区域资料分析，恢复了盆地北部新生代构造演化历史，认为新生代构造活动控制了区域的构造-地貌演化和地下水流向的改变，进而控制了地浸砂岩型铀矿成矿作用，并由此指出了三个泉斜坡带为有利的区域找矿远景区段。The Dingshan area, located at the northern Junggar Basin, is a significant prospecting area for sandstonetype uranium deposits. Field investigation and interpretation of remote-sensing images show that the Cenozoic tectonic movement in this area is characterized by reactivation of deep thrust-faults, resulting in extensional fractures and formation of large billabongs at the surface. Measurement of slickensides and joints indicates that there are at least two stages of new tectonic movement during the Pliocene to Pleistocene. The early one is -NStrending compressional deformation. The later one shows NE-NEE-trending compression in the Middle Pleistocene, dated at 0.1 ～0.4 Ma by the ESR-dating method of gouge and gypsum. The tectonic evolution process of the northern Junggar Basin during the Cenozoic is, therefore, reconstructed based on .sedimentary filling features, showing that both the formation and evolution of the landform and the movement of groundwater are controlled by the neotectonic movement. Thus, it is suggested that the Sangequan block is a favorable metallogenic area for sandstone-type uranium deposit.

关 键 词：准噶尔盆地 新生代构造 砂岩型铀矿 

分 类 号：P546[天文地球—构造地质学] P619.14[天文地球—地质学]