库车拗陷中生代成盆构造背景与天山造山带古地貌演变——多剖面碎屑锆石U-Pb年龄限定  

Mesozoic Basin-forming tectonic setting in the Kuqa Depression and paleomorphologic evolution of the Tianshan Orogenic Belt——Constraints from multi-profile detrital zircon U-Pb ages

作　　者：黄少英[1,2,3] 雷钰薇 罗彩明 段云江[1,2,3] 亢茜 吴鸿翔[4,5] 王子一 章凤奇 程晓敢 HUANG Shaoying;LEI Yuwei;LUO Caiming;DUAN Yunjiang;KANG Qian;WU Hongxiang;WANG Ziyi;ZHANG Fengqi;CHENG Xiaogan(Research Institute of Exploration and Development,Tarim Oilfield Company,China National Petroleum Corporation,Korla,Xinjiang,841000;Exploration and Development Center of Ultra-Deep Complex Oil and Gas Reservoirs,China National Petroleum Corporation,Korla,Xinjiang,841000;Exploration and Development Engineering Research Center of Ultra-Deep Complex Oil and Gas Reservoirs,Xinjiang Uygur Autonomous Region,Korla,Xinjiang,841000;Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province,School of Earth Sciences,Zhejiang University,Hangzhou,310058;Structural Research Center of Oil&Gas Bearing Basin of Ministry of Education,Hangzhou,310058)

机构地区：[1]中国石油塔里木油田分公司勘探开发研究院,新疆库尔勒841000 [2]中国石油天然气集团有限公司超深层复杂油气藏勘探开发技术研发中心,新疆库尔勒841000 [3]新疆维吾尔自治区超深层复杂油气藏勘探开发工程研究中心,新疆库尔勒841000 [4]浙江大学地球科学学院,浙江省地学大数据与地球深部资源重点实验室,杭州310058 [5]教育部含油气盆地构造研究中心,杭州310058

出　　处：《地质论评》2025年第2期655-669,共15页Geological Review

基　　金：国家自然科学基金项目(面上项目)(编号:42372244,42077223)的成果。

摘　　要：库车拗陷位于天山造山带东南缘,其中生代成盆构造背景和古地貌长期存在争议。本文通过系统搜集和分析库车拗陷的拜城、黑英山、库车河等中生界剖面碎屑锆石样品16件、共计1406个U-Pb测年数据,与来自伊犁和准噶尔南缘的中生代盆地的17件碎屑锆石样品的U-Pb年龄进行对比分析,结合区域构造,探讨了库车拗陷中生代成盆构造背景和天山造山带古地貌格局演变。结果表明,库车拗陷的主要物源区为南天山和部分中天山南缘,伊犁盆地中生代沉积物的主要来自于伊犁—中天山和部分南天山区域,而准噶尔盆地南缘则主要接受来自北天山的沉积物。碎屑锆石的物源记录到3期的物源转变,物源转变时期分别位于早三叠世、晚三叠世和晚侏罗世。库车拗陷在中生代经历了两阶段成盆过程,三叠纪挤压构造事件之后,晚三叠世—中侏罗世为伸展裂陷盆地,晚白垩世以来为拗陷盆地,区域上发生由挤压到伸展再到挤压的构造转换。天山造山带中生代早期隆起地貌主要是中天山,白垩纪晚期受挤压,南天山快速隆升,总体上天山造山带古地貌对其两侧中生代盆地构成显著的分割作用。Objectives:The Kuqa Depression is located in the southeastern margin of the Tianshan Orogenic Belt.The Mesozoic strata in the Kuqa Depression contain abundant oil and gas resources and have important exploration potential.However,the tectonic setting of the Mesozoic Kuqa Depression,and the paleomorphologic evolution of the Tianshan Orogenic Belt remain controversial.Methods:By systematically collecting and analyzing 1406 U-Pb dating data of 16 detrital zircon samples from the Mesozoic sections of Baicheng,Haiyingshan and Kuchehe in the Kuqa Depression,and then comparing with the U-Pb ages of 17 detrital zircon samples from the Mesozoic basins of Ili and the southern margin of Junggar,finally combining with the regional structure,the tectonic setting of Mesozoic basin-forming in Kuqa Depression and the evolution of paleomorphologic evolution of the Tianshan Orogenic Belt are discussed.Results:The results show that the main provenance area of the Kuqa Depression is mainly the southern Tianshan Mountains and partially the southern margin of the Central Tianshan Mountains;the Mesozoic sediments in the Ili Basin are mainly from the Ili—Centra Tianshan and partially the Southern Tianshan Mountains;and the sediments in the southern Junggar Basin are mainly from the Northern Tianshan Mountains.The detrital zircon U-Pb ages records three phases of provenance transition,which are located in the Early Triassic,Mid—Late Triassic and Late Jurassic respectively.Conclusions:The Kuqa Depression experienced two stages of basin formation in the Mesozoic.After the Triassic compressive tectonic event,the late Triassic to Middle Jurassic was an extensional rift basin,and the Late Cretaceous was a depression basin.The tectonic transition from compression to extension and then to compression occurred in the region.The uplift geomorphology of the Tianshan Orogenic Belt in the early Mesozoic is mainly the Central Tianshan Mountain,and the south Tianshan Mountain is rapidly uplifted during the Late Cretaceous compression.In general,th

关 键 词：库车拗陷 中生代 碎屑锆石U-PB年龄 成盆构造背景 古地貌格局 

分 类 号：P61[天文地球—矿床学]