新疆乌拉根中-新生代沉积盆地和前陆冲断褶皱带对铜铅锌-天青石-铀-煤成矿控制规律  

Mesozoic-Cenozoic Sedimentary Basin,Foreland Fold-and-Thrust Meralization Reglarities of Copper-lead-zinc-celesite-uranium-coal in Wulagen,Xinjiang,China

作　　者：方维萱[1,2] 王磊[1] 鲁佳[1,2] 李天成[1] 贾润幸[1] FANG Weixuan;WANG Lei;LU Jia;LI Tiancheng;JIA Runxing(China Nonferrous Metals Resource Geology Survey,Innovation Laboratory of Mine,Environment and Mineral,Beijing 100012,China;Kunming University of Science and Technology,College of Land and Resources Engineering,Kunming 650093,Yunnan,China)

机构地区：[1]有色金属矿产地质调查中心矿山生态环境资源创新实验室,北京100012 [2]昆明理工大学国土资源工程学院,云南昆明650093

出　　处：《大地构造与成矿学》2020年第5期881-912,共32页Geotectonica et Metallogenia

基　　金：国家自然科学基金项目(41872160);自然资源部公益性行业科研专项项目(201511016-1);中国地质调查局地质大调查项目(12120114081501);云南省矿产资源评价工程实验室项目(2010);云南省地质过程与矿产资源创新团队项目(2012)联合资助。

摘　　要：塔西地区是我国典型盆山原镶嵌构造区,乌拉根中-新生代沉积盆地为铜铅锌-石膏-天青石-铀-煤-天然气同盆共存富集区。这种特色陆内成矿单元因复杂构造形成演化史,多矿种同盆共存富集成矿内在关系不明。在对塔西地区构造岩相学垂向相序结构研究基础上,经原型盆地恢复、盆地动力学、盆地形成演化与构造变形史等综合研究,将构造-岩石地层系统划分为元古宙中高级变质断块(下基底构造层)、晚古生代地层(上基底构造层),下三叠统、侏罗系、白垩系、古近系和新近系为盆地充填地层体,认为乌拉根中-新生代沉积盆地经历了早三叠世-早侏罗世山体隆升与山前断陷山盆转换、早-中侏罗世主成盆期、中-晚侏罗世构造反转期、白垩纪-古近纪挤压-伸展转换主成盆期、新近纪陆内周缘山间盆地等五个主要期次。其中早侏罗世康苏期和中侏罗世杨叶期为聚煤期,形成了半环状煤矿带和煤系烃源岩。燕山早期(J2-3)和燕山晚期(K1-E1a)两次前陆冲断作用导致盆地发生构造反转,构造沉降-沉积中心从NW向转为近EW向。白垩纪-古近纪挤压-伸展转换成为主成盆期,盆地动力学为受同生断裂带控制。挤压走滑抬升隆起形成乌拉根半岛;走滑拉分断陷的构造扩容空间形成了乌拉根局限海湾瀉湖盆地,为克孜勒苏群和古近系提供了沉积容纳空间。阿尔塔什组底部热卤水沉积交代-改造型天青石矿床和石膏矿床形成于古近纪初。石膏岩-含膏泥岩-含膏泥质白云岩不但为区域滑脱构造面,也是阿克莫木天然气田良好的盖层。始新世伊普里斯阶-普利亚本阶(55.8~33.9 Ma)为铅锌-铀-天然气成藏成矿高峰期,与喜山早期三幕区域挤压构造环境和相关海退过程有显著的时间-空间耦合关系。中新世阿启坦阶-布尔迪加尔阶(23.03~15.97 Ma)形成天然气充注成藏事件。安居安组砂岩型铜矿床与该The Wulagen basin,which is located in the northwestern part of the Tarim Basin,a typical basin-mountain-pleatau mosaic tectonics,is rich in Cu-Pb-Zn-celestite-gypsum-uramium-coal-gas.Due to its complex tectonic evolution,however,the mechanism of overall mineralization in the basin is still enigmatic.Based on the study of the vertical tectonic lithofacies sequence in the northwest part of the Tarim Basin,a comprehensive study was carried out on the reconstruction of prototype basin,basin dynamics,basin formation and deformation.The tectonics-rock-strata may be classified into the Proterozoic medium-high grade metamorphic faulting-block or the lower tectonic basement,the Paleozoic strata or the upper tectonic basement,and basin-filling strata.The basin-filling strata consist of the upper Triassic,Cretaceous,Paleogene,and Neogene in the Wulagen basin.The Wulagen basin underwent five stages of evolution,including the Late Triassic faulting-basin,the Early-Middle Jurassic main basin formation,the Middle-Late Jurassic tectonic conversion of the basin,the Cretaceous to the Paleogene formation of compression-extension converting basin,and the Cenozoic intracontinental basin.First,the Early Jurassic Kangsu Group and the Middle Jurassic Yangye Group might be the stage of coal accumulation,resulted in a half-ring-shape coal zone and coal-bearing source rocks.The foreland fold-and-thusting during the early(J2-3)and late Yanshanian(K1-E1a)resulted in the basin inversion and sedimentary centre migration from the NW-trending of the sedimentary centre to the WE-trending in the study area.Secondly,the Wulagen basin dynamics cloud be controlled by syn-faulting in the formation of compression-extension converting basin from the Cretaceous to the Paleogene.The Wulagen peninsula might have been formed by the compression strike-slipping and uplifting,however,the Wulagen confined gulf-lagoon basin might have been formed by the strike-slipping saging,which may account for the Kezilesu Formation and Paleogene system.The early Paleogene b

关 键 词：同盆共存富集 原型盆地 盆地动力学 挤压-伸展转换走滑作用 陆内转换盆地 超大型铅锌矿床 乌拉根 

分 类 号：P67[天文地球—海洋地质]