New Zircon U-Pb Ages for the Volcano-sedimentary Strata in Yamu,Tibet and their Geological Significance

• 作者: XU Peiyan YANG Zhusen ZHENG Yuanchuan HOU Zengqian WEN Ning YU Chao
• 来源期刊: 地质学报（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: RESEARCH ADVANCES
• 页码范围: 687-690
• 页数: 4页
• 语种: 英文

摘要

Objective The Gangdese porphyry Cu deposits(PCDs)are currently the most academically and economically significant in the Lhasa terrane.Except for the giant Xiongcun PCD,which were formed in the Jurassic,almost all the others were formed in the Miocene(e.g.Qulong,Jiama).Previous studies have shown that these Miocene PCDs have a close spatial and genetic relationship with Jurassic magmatic arcs(Hou et al.,2015).The Xiongcun deposit is located in the Jurassic volcano-sedimentary strata,previously identified as the Early Cretaceous Bima Formation in the 1︰ 250,000 geological map of Lazi County.It is worth noting that the map shows that the Bima Formation is also widespread in northern Yamu Township,near which the large Miocene Zhunuo PCD was developed(Huang et al.,2017)(Fig.la).In order to accurately determine the age of formation of the volcano-sedimentary strata exposed in Yamu and further verify whether the Zhunuo deposit is genetically linked to the Jurassic arc,we first carried out systematic zircon U-Pb dating for the strata on the basis of a detailed routine geological survey.This study can provide fundamental information for further research.