%0 Journal Article
%T Zircon SHRIMP U-Pb dating of porphyry vein from the Jiama copper polymetallic deposit in Tibet and its significance<br>西藏甲玛超大型铜矿区斑岩脉成岩时代及其与成矿的关系
%A YING LiJuan
%A TANG JuXing
%A WANG DengHong
%A ZHENG WenBao
%A QIN ZhiPeng
%A ZHANG Li
%A <br>应立娟
%A 唐菊兴
%A 王登红
%A 郑文宝
%A 秦志鹏
%A 张丽
%J 岩石学报
%D 2011
%I 
%X The Jiama copper polymetallic deposit is an important ore deposit with a super-large scale in the Gangdese metallogenic belt of Tibet. Re-Os dating of molybdenites occurred in skarn, porphyry and hornfels has indicated the metallogenic period of Cu-Mo mineralization during 17Ma to 14Ma, whereas the research on its age of diagenesis is rather lack, especially for the porphyry veins as south-north distributed outcrops. In this paper, two samples of slightly mineralized porphyry rocks: granite porphyry (sample JM52-0) and granitic diorite porphyry (sample JM52-46.7), have been collected from the No. 52 adit in Qianshan of the mining area. Through zircon SHRIMP U-Pb dating at the first time, their 206Pb/238U -207Pb/235U concord ages are 14.2±0.2Ma and 14.1±0.3Ma, respectively. The ages from the zircon SHRIMP U-Pb dating in this paper mean the crystallization age of magmatic zircon representing the south-north distributed granite and granitic diorite porphyry outcrops. The diagenesis age of this type porphyry veins is at the same period of ore-bearing porphyry intrusive event related to the south-north normal fault system and rift zone in Gangdese(18~12Ma). Diagenesis and mineralization age of the Jiama copper polymetallic deposit shows the similar period for metallogenesis and diagenesis, which is similar to other porphyry-skarn type ore deposits in the east part of the Gangdese metallogenic belt with a strong concentration of mineralization during 17~14Ma, indicating the magmatic-tectonic events in Miocene in the Gangdese and the genesis relationship between Cu-Mo mineralization and hydrothermal process in Jiama.
%K Zircon SHRIMP age
%K Porphyry vein
%K Diagenesis and mineralization age
%K Jiama
%K Tibet<br>锆石SHRIMP年龄
%K 斑岩脉
%K 成岩成矿时代
%K 甲玛
%K 西藏
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=2013B5467E3054B1614CEC199353FCED&aid=8C6F2BFE80788BD186DC45DCCF69C9AF&yid=9377ED8094509821&vid=DB817633AA4F79B9&iid=DF92D298D3FF1E6E&sid=938DF4F02EA7B2E0&eid=3852E53ACC3276FE&journal_id=1000-0569&journal_name=岩石学报&referenced_num=0&reference_num=23