东昆仑地区沙松乌拉组物质来源及源区构造-热事件——来自碎屑锆石U-Pb年代学的证据  

The provenance of Salawula Formation in East Kunlun and the tectonic thermal events of provenance:The evidence from U-Pb chronology of detrital zircons

作　　者：靳立杰 王继林[3] 赵体群 周汉文[4] 孙天河 李春稼 韩智昕 贾伟伟 JIN Lijie;WANG Jilin;ZHAO Tiqun;ZHOU Hanwen;SUN Tianhe;LI Chunjia;HAN Zhixin;JIA Weiwei(No.1 Institute of Geology and Mineral Resource Exploration of Shandong Province,Ji’nan 250014,Shandong,China;Shandong Engineering Laboratory for High-Grade Fe Ores Exploration and Exploitation,Ji’nan 250014,Shandong,China;Shandong Bureau Testing Center of China Metallurgical Geology Bureau,Ji’nan 250014,Shandong,China;China University of Geosciences,Wuhan 430074,Hubei,China;Geological Exploration Institute of Shandong Zhengyuan,Ji’nan 250014,Shandong,China;China Railway Siyuan Survey and Design Group Co.,Ltd.,Wuhan 430074,Hubei,China)

机构地区：[1]山东第一地质矿产勘查院,山东济南250014 [2]山东省富铁矿勘查技术开发工程实验室,山东济南250014 [3]中国冶金地质总局山东局测试中心,山东济南250014 [4]中国地质大学(武汉),湖北武汉430074 [5]中国冶金地质总局山东正元地质勘查院,山东济南250014 [6]中铁第四勘察设计集团有限公司,湖北武汉430074

出　　处：《地质通报》2020年第7期1025-1034,共10页Geological Bulletin of China

基　　金：中国地质调查局项目《青海省1:5万黑海、扎鲁塔斯、红石沟、加祖他士沟、深沟幅区域地质调查》(编号:1212011086001)。

摘　　要：沙松乌拉组出露于东昆中构造混杂岩带,是东昆仑地区原特提斯洋洋盆打开时的沉积记录,确定其地层形成时代、物质来源及恢复构造演化过程,对研究东昆仑地区原特提斯洋的演化具有重要意义。对出露于东昆仑黑海湖—拉宁灶火沟一带的沙松乌拉组进行LA-ICP-MS碎屑锆石U-Pb年定,得到最年轻的锆石年龄为632±6 Ma,结合地层接触关系,为沙松乌拉组的时代划分提供了年龄依据;得到约650 Ma、约800 Ma、980 Ma三个明显峰值及大量未形成明显峰值的其他古老年龄,推测沙松乌拉组的主要物源有小庙群、万保沟群、晋宁期岩浆岩,次要物源为白沙河组。将得到的锆石年龄与各期构造-岩浆活动比对,认为沙松乌拉组的源区经历了古元古代早期构造-岩浆事件、中元古代晚期构造-岩浆事件和新元古代早期构造-岩浆事件。Salawula Formation is the earliest marine deposit of East Kunlun in early Paleozoic.It’s meaningful to reconstruct the tectonic evolution of east Kunlun in Early Paleozoic by studying Salawula Formation’s formation time and its provenance.The authors obtained the youngest zircon age of 632±6 Ma by LA-ICP-MS U-Pb dating of the detrital zircons from Salawula Formation’s clastic rocks and constrained its formation time.Moreover,there are three age ranges of^650 Ma,~800 Ma and^980 Ma existent in the detrital zircons,and the authors infer that Baishahe Group,Xiaomiao Group,Wanbaogou Group and magmatic rocks formed during early Neoproterpzoic were Salawula Formation’s provenance because of their similar zircon age distributions.Furthermore,the authors hold that the source areas experienced Early Paleoproterozoic,Late Paleoproterozoic,Late Mesoproterpzoic and Early Neoproterpzoic tectono-magmatic events according to the characteristics of their zircons’U-Pb age.

关 键 词：沙松乌拉组 碎屑锆石 U-PB年龄 地层时代 物质来源 构造-岩浆事件 

分 类 号：P597.3[天文地球—地球化学]