库车坳陷秋里塔格构造带构造隆升过程及其对层间氧化作用的制约  

Stage Division of Tectonic Uplift and Its Constrain on Interlayer Oxidation of Qiulitage Structural Belt,Kuqa Depression

作　　者：王元元[1] 王强强[1] 鲁克改[1] 吕俊维 杨小强[1] WANG Yuanyuan;WANG Qiangqiang;LU Kegai;LYU Junwei;YANG Xiaoqiang(Geologic Party No.216,CNNC,Urumuqi,Xinjiang 830011,China)

机构地区：[1]核工业二一六大队,新疆乌鲁木齐830011

出　　处：《铀矿地质》2021年第5期843-853,共11页Uranium Geology

基　　金：中国核工业地质局项目(编号:201907-2、201907-1、201907-4、201708-2)资助。

摘　　要：秋里塔格构造带变形强烈且隆升过程复杂,其隆升过程直接影响上新统库车组铀成矿过程。文章以该带典型构造现象为对象,以地质调查和钻孔资料为依据,研究各类典型构造产出状态,分析其地质意义,进而进行构造隆升阶段划分,并浅析构造隆升过程与层间氧化过程的耦合关系。研究显示,该带东西分段且普遍发育箱状褶皱,东端东秋背斜为完整箱状背斜;东段东秋北侧、中段北秋北侧、南秋南侧相邻产出屉状向斜;日达里克南部见屉状向斜,沿走向向东变为不对称向斜及宽缓箕状构造。下更新统西域组削顶库车塔吾背斜、库车背斜、并推测削顶东秋背斜而不整合于库车组之上。上更新统新疆群为日达里克构造系分割而呈水平状,同标高产于其南、北侧,超覆于库车组之上。综合该带典型构造特征及区域资料,将其隆升过程划分为3个阶段:褶皱低隆阶段(上新统库车组沉积早期—下更新统西域组沉积早期)、推覆速隆阶段(下更新统西域组沉积中期—上更新统新疆群沉积晚期)、后生叠加阶段(全新世以来),并分别可与玉尔滚褐红色氧化岩系、日达里克褐红-褐黄色氧化岩系、日达里克及以东的灰白-浅黄色氧化岩系耦合,对该区带铀矿找矿工作具有重要理论指导意义。Qiulitage structural belt is strong in tectonic deformation and complex in tectonic uplift,and the tectonic uplift process directly affects the uranium mineralization process in Pliocene Kuqa Formation.This paper divided the stages of tectonic uplift of Qiulitage structural belt and analyzed the coupling relationship between tectonic uplift and interlayer oxidation by studying the attitude and geological significance of typical tectonic phenomena based on the geological survey and drilling data.Research showed that box fold is generally developed in Qiulitage Structural Belt,which is well-formed box anticline in the east end of the belt,and one side of box syncline in north side of East Qiulitage Anticline,North Qiulitage Anticline and south side of South Qiulitage Anticline in the east-middle part of the belt,and well-formed Neonatal box syncline in South Ridalike Syncline in the middle part of the belt.Topping unconformity occurred between early Pleistocene Xiyu Formation and Pliocene Kuqa Formation in Kuchetawu anticline,and Kuqa anticline,the north side of east Qiulitage anticline in the east part of the belt.Overlap occurred between late Pleistocene Xinjiang Group and Pliocene Kuqa Formation in Ridalike Area.The tectonic uplift process of the belt was divided into three stages:Folding and low ridge stage from early Pliocene to the initial stage of early Pleistocene,rapid thrusting uplift stage from the middle stage of early Pleistocene to the last stage of late Pleistocene,and superposition stage from Holocene.The three stages are respectively related to the maroon oxidized rock series in Yuergun area,the maroon-brown yellow oxidized rock series in Ridalike area,the gray white to light yellow oxidized rock series in Ridalike area and Dumaili-Wenbashi area in the formation process.

关 键 词：秋里塔格 箱状褶皱 角度不整合 构造隆升 层间氧化 

分 类 号：P548[天文地球—构造地质学] P619.14[天文地球—地质学]