塔里木盆地北缘塔里克地区构造变形特征与砂岩型铀成矿作用关系研究  

Tectonic Deformation Features and Its Metallogenic Relationship to the Sandstone-type Uranium Deposits in the Talike Area,Northern Margin of Tarim Basin

作　　者：韩凤彬[1] 陈正乐[1] 王国荣[2] 阿种明[2] 杨军峰 霍海龙 孙潇[2] 鲁克改[2] Han Fengbin;Chen Zhengle;Wang Guorong;A Zhongming;Yang Junfeng;Huo Hailong;Sun Xiao;Lu Kegai(Institute of Geomechanics,Chinese Academy of Geological Sciences,Beijing,100081,China;Geology Party No.216,CNNC,Urumuqi,Xinjiang,830001,China)

机构地区：[1]中国地质科学院地质力学研究所,北京100081 [2]核工业二一六大队,新疆乌鲁木齐800011

出　　处：《新疆地质》2021年第4期661-666,共6页Xinjiang Geology

基　　金：中国核工业地质局项目(201907-4);国家科技支撑计划项目(2018YFC0604005,2015BAB05B04);中国地质调查局基本科研业务费(JYYWF20180702,JYYWF20180602);国家自然科学基金项目(41902214,41902200)联合资助。

摘　　要：塔里克地区位于塔里木盆地库车坳陷东部,已发现一系列砂岩型铀矿床(点)。本次研究在野外调查和构造变形分析基础上,探讨塔里克地区中新生代以来变形期次、时限及与砂岩铀矿成矿作用关系。研究表明,该区中新生代构造变形主要为吐格尔明背斜及近EW向、NE-NNE向断裂构造。EW向断裂以逆冲推覆性质为主,NE-NNE向断裂主要为左旋走滑性质,与推测的NNW向右旋走滑断裂构成区域褶皱-断裂构造,指示区域性近NS向挤压应力性质。据生长地层发育情况,吐格尔明背斜最终定型于上新世晚期—早更新世早期。结合不整合面发育及区域资料分析,认为吐格尔明背斜在中生代晚期至新生代早期开始形成,发育一系列逆冲推覆构造和NE向左旋走滑地层。受印亚碰撞及汇聚过程远程效应影响,古近—新近纪吐格尔明背斜再次抬升剥露。新近纪持续的NS向应力作用,叠加于吐格尔明背斜之上,在背斜南翼发育近EW向断裂,形成NE向的左旋走滑断层。结合铀矿化特征,推测铀矿化(体)形成于中生代晚期—古近纪。中新世之后,早期形成的矿体随区域构造变形被改造,呈矿体倒转、正常或被剥蚀状态。Talikeis located at the east part of the Kuqa depression,northern edge of the Tarim Basin.Series sandstonetype uranium deposits have been found.On the basis of field investigation and structural deformation analysis,this paper mainly focus on the deformation characteristics and stage during the Mesozoic to Cenozoic in theTalike area and their constraints on the sandstone-type uranium deposits.The Mesozoic-Cenozoic structural deformation in this area is mainly behaved as the formation of the Tugeerming anticline and its accompanying EW trending and NE-NNE trending faults.The thrust faulting of the EW trending faults,and the sinistral-slipping NE-NNE trending faults,together with the suggested dextral-slipping NNW trending faults,constitute a regional fold-fault system,indicating the regional compressive stress properties in the near NS direction,corresponding with the regional stress field.According to the development of growth strata,the Tugeerming anticline was finally formed during the late Pliocene to early Pleistocene.Combined with the development of unconformity and regional data analysis,it is considered that the Tugeerming anticline probably formed during the Late Mesozoic to the early Cenozoic,accompanied by a series of thrust nappe structures and NE trending sinistral strike-slipping faults.The Tugeerming anticline was probably uplifted and exposed again at the beginning time of the Neogene as the response to the far-distance affection of the Indo-Asian collision and afterward convergence process.During the Neogene,the continuous NS trending stress resulted in re-deformation of the Tugeerming fold,and the formation of NE trending left lateral strike slip faults and EW trending faults in the southern flank of the anticline.Combined with the analysis of uranium mineralization characteristics,it is inferred that uranium mineralization was formed during the Late Mesozoic to the Paleogene.After the Miocene,the early-formed ore bodies were transformed with the regional tectonic deformation,resulting in the sta

关 键 词：塔里木盆地 塔里克 构造变形 新生代 砂岩型铀矿 

分 类 号：P54[天文地球—构造地质学] P619.14[天文地球—地质学]