摘要
伊犁盆地新构造运动在地貌、断裂活动和地层接触关系等方面表现十分明显.通过构造地貌和构造年代学的分析方法,对其表现特征和运动特征及其与铀成矿之间的关系进行研究.伊犁盆地新构造具 4 个演化阶段:①始新世晚期—渐新世盆地新构造运动起始活动阶段;②中新世盆地南缘隆升、北缘差异沉降阶段;③上新世末—早更新世盆地新构造强烈挤压隆升与沉降阶段;④中更新世至今盆地新构造差异升降运动阶段.伊犁盆地新构造运动对区内砂岩型铀矿成矿在空间上和时间上均具有明显的控制作用,活动期次决定了铀成矿时间上的分段性,活动强度决定铀成矿空间分布的不均一性.
Neotectonic activity of Yili basin shows apparent evidences on land form, fault activities and stratigraphic contact. By using the approach of morphostructure and tectonic chronology analysis, neotectonic activity evidences and characteristics as well as its ralation to uranium mineralization were researched. Neotectonic activities in this area can be divided four evolution stages:①the beginning stage of neotectonic activity from late Eocene to Oligocene;②the stage of uplifting in south margin area and different subsidence in north margin area during Miocene;③the stage of strongly compressing uplift and subsidence of neotectonic activities from late Pliocene to early Pleistocene;④the stage of different subsidence of neotectonic activities from Mid-Pleistocene to now. Neotectonic activity shows evident control to the formation of sandstone-type uranium mineralization in time and space.
出处
《新疆地质》
CAS
CSCD
2004年第4期378-381,共4页
Xinjiang Geology
基金
国家 973 项目(2001CB409808)资助
