Zircon U-Pb Age of the Quartz Porphyry from Dongzhongla Pb-Zn Deposit in <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:country-region w:st="on">Tibet</st1:country-region>, <st1:country-region w:st="on"><st1:place w:st="on">China</st1:place></st1:country-region>

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Zircon U-Pb Age of the Quartz Porphyry from Dongzhongla Pb-Zn Deposit in Tibet, China

详细信息

责任者：Cui Xiaoliang (College of Earth Sciences ; Chengdu University of Technology ; Chengdu 610059 ; China) ; Tang Juxing
刊名：Journal of Chengdu University of Technology
出版年：2011
卷期：38(5)
关键词：铅锌矿床 ; lead-zinc deposit ; 石英斑岩 ; quartz porphyry ; 地质年代学 ; geochronology ; 西藏 ; Tibet
页码：p.557-562
图表：illus., 1 table, 4 refs.
分类号：1300
出版序号：826
issnNo：ISSN1671-9727
isbnNo：CN51-1634/N

摘要

PAN id=EnChDivSummary name="EnDivSummary">This paper discusses which period the quartz porphyry in the Dongzhongla Pb-Zn ore district belongs.Through the detailed geological mapping and using the high precision magmatic zircon LA-ICPMS U-Pb dating,the authors date the quartz porphyry from the Dongzhongla deposit.The dated 22 zircon grains from the quartz porphyry present that ²⁰⁶Pb/²³⁸U weighted mean age is 126.1±1.1 Ma(n=22,MSWD=0.96).Thus,it denies the previous understanding that these rock units belong to the Linzizong Group Pana formation in Eocene.The crystallization of the quartz porphyry occurred between 125.8~128.0 Ma during the late Yanshanian period.This is in accordance with the age of quartz porphyry from Yaguila which located in the east of Dongzhongla.It indicates that there existed large-scale magma activity before 126 Ma in Nyanqentanglha region.

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