中祁连木里盆地古近系ESR年龄及地质意义  

ESR DATING OF THE PALAEOGENE IN MULI BASIN IN THE MIDDLE OF QILIAN MOUNTAINS AND ITS GEOLOGICAL SIGNIFICANCE

作　　者：戚帮申 胡道功[2] 王进寿[3] 赵希涛[4] 张绪教[1] 张耀玲[2] 杨肖肖[4] 高雪咪[1] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083 [2]中国地质科学院地质力学研究所,北京100081 [3]青海省地质调查院,青海西宁810007 [4]中国科学院地质与地球物理研究所,北京100029

出　　处：《地质力学学报》2013年第4期392-402,共11页Journal of Geomechanics

基　　金：中国地质调查局"祁连山及邻区天然气水合物资源勘查(控矿因素综合研究及编图)"项目(GZHL20120301)

摘　　要：对中祁连木里盆地新生代红层进行ESR测年,获得了祁连山地区新生代红层沉积时代及构造变形年代学数据.研究表明,中祁连木里盆地内沉积了巨厚的新生代红层,较好地记录了祁连山隆升历史.盆地最老的新生代地层为始新世由湖相沉积组成的火烧沟组,ESR年龄为40.2～35.3 Ma,与上覆沉积时代为32.6～24.3 Ma的渐新世河湖相沉积组成的白杨河组呈角度不整合接触.构造变形特征与沉积环境的变化说明始新世末与渐新世初木里地区发生了构造变形和山脉的隆升,与祁连山地区新生代早期的隆升有很好的对应关系.The technique of ESR was applied to determine the Cenozoic red beds, Muli Basin, therefore, we can get the age of sedimentary and tectonic deformation. The results indicated there were huge thick Cenozoic Red Beds and tectonic deformation geochronological data, well recording the uplift of Qilian Mountains. Based on the ESR dating, the Tertiary sediments include the Eocene to Oligocene Huoshaogou Formation （40.2 - 35.3 Ma） , which consists mainly of lacustrine facies and the Oligocene Baiyanghe Formation （32.6 - 24.3 Ma） , which consists lacustrine and fluvial facies. From late Eocene to early Oligocene, an obvious angular unconformity exists between the upper and lower strata and it can be inferred that Qilian Mountains area has been a tectonic deformation and uplift, which has corresponding connection with the early Cenozoic uplift of Qilian Mountains.

关 键 词：白杨河组 火烧沟组 ESR年龄 中祁连 

分 类 号：P597.3[天文地球—地球化学]