柴达木盆地北缘中新世中期以来的幕式造山作用——碎屑锆石的约束  

The Episodic Mountain-Building Processes on the Northern Margin of the Qaidam Basin Since the Mid-Miocene Constrained by Detrital Zircon Analysis

作　　者：肖永军[1] 刘俊民[1] 孙波[1] 杨帅 刘燕红 刘灿灿[2] 陈乾威 肖安成 于永利[1] 沈嫣蘅[2] 毛黎光 Xiao Yongjun;Liu Junming;Sun Bo;Yang Shuai;Liu Yanhong;Liu Cancan;Chen Qianwei;Xiao Ancheng;Yu Yongli;Shen Yanheng;Mao Liguang(Sinopec Petroleum Exploration and Production Research Institute,Dongying,Shandong,257015,China;College of Earth Science,China University Of Mining and Technology-Beijing,Beijing,100083,China;PetroChina Huabei Oilfield Company,Renqiu,Renqiu,Hebei,062550,China;Hebei Huabei Oilfield Youxin Exploration and Development Service Co.,Ltd,Renqiu,Hebei,062550,China;Zhejiang University,Hangzhou,Zhejiang,310058,China)

机构地区：[1]中国石化胜利油田分公司勘探开发研究院,山东东营257015 [2]中国矿业大学(北京),北京100083 [3]中国石油天然气股份有限公司华北油田分公司,河北任丘062550 [4]河北华北油田友信勘探开发服务有限公司,河北任丘062550 [5]浙江大学,浙江杭州310058

出　　处：《新疆地质》2025年第1期36-43,共8页Xinjiang Geology

基　　金：国家自然科学基金青年基金(41502189);中石化科技攻关项目柴达木及走廊地区油气资源潜力及选区评价(P22065);柴北缘东段油气成藏控制因素及目标评价(P23053)联合资助。

摘　　要：柴达木盆地北缘山系的隆升作用是青藏高原北向扩展过程的一部分。本次对柴达木北缘埃姆尼克山地区开展了野外观测、地震剖面解释和碎屑锆石测年工作。埃姆尼克山地区普遍发育两个角度不整合面,其一为上油砂山组和下覆地层不整合,其二为更新统同下覆地层的不整合。采自埃姆尼克山南北两侧上油砂山组下部碎屑锆石年龄表明,埃姆尼克山在上油砂山组沉积时已不作为阻挡源汇系统的隆起构造,沉积物源来自东昆仑山而非柴北缘-祁连地区,表明埃姆尼克山发育快速夷平作用。本文提出柴北缘地区中新世中期以来的变形作用具幕式特征,两幕造山作用分别发生在中新世中期和上新世末期—第四纪早期。The uplift of the mountain range on the northern margin of the Qaidam Basin is part of the northward expansion process of the Qinghai-Tibet Plateau.In this study,field observations,seismic profile interpretations and detrital zircon dating were carried out in the Eminike Mountain area on the northern margin of the Qaidam Basin.In the Eminike Mountain area,two angular unconformities are commonly developed.One is the unconformity between the Upper Youshashan Formation and the underlying strata,and the other is the unconformity between the Lower Quaternary and the underlying strata.The ages of detrital zircons collected from the lower part of the Upper Youshashan Formation on both the north and south sides of the Eminike Mountain show that during the deposition of the Upper Youshashan Formation,the Eminike Mountain no longer functioned as an uplifted structure blocking the source-sink system.The sediment source was from the East Kunlun Mountains rather than the northern Qaidam-Qilian area,indicating that rapid planation occurred in the Eminike Mountain.This paper proposes that the deformation in the northern Qaidam area since the middle Miocene has episodic characteristics,with two orogenic episodes occurring in the middle Miocene and at the latest Pliocene/early Quaternary respectively.

关 键 词：青藏高原 柴达木盆地 新近纪 碎屑锆石测年 幕式隆升 

分 类 号：P313.6[天文地球—固体地球物理学] P542.2[天文地球—地球物理学]