%0 Journal Article
%T SHRIMP zircon U-Pb dating of the Gangou granitoids, Central Tianshan Mountains, Northwest China and tectonic significances
%A Shi Yuruo
%A Liu Dunyi
%A Zhang Qi
%A Jian Ping
%A Zhang Fuqin
%A Miao Laicheng
%A <br>SHI
%A YuRuo
%A LIU
%A DunYi
%A ZHANG
%A Qi
%A JIAN
%A Ping
%A ZHANG
%A FuQin
%A MIAO
%A LaiCheng
%J 科学通报(英文版)
%D 2007
%I 
%X Two types of granitoids, highly deformed augen granitoids and undeformed fine-grained granitoids, are widely distributed in Gangou area, Central Tianshan Mountains, Northwest China. The augen granitoids are high-K calc-alkaline characterized by high K2O, Rb, Y and Th, and low Sr and Sr/Y. They also have high contents of large ion lithophile elements (LILE), such as Ba, Rb, K and Th, and relatively low contents of high field strength elements (HFSE), such as Zr, Y and Nb. The fine-grained granitoids are calc-alkaline characterized by high Sr, low Y and HREE, similar to adakitic rocks, and with Na2O/K2O<2 (1.76–1.91), high I Sr (0.70689–0.70981), and negative ε Nd(t) ( 2.4– 5.3). High-precision SHRIMP U-Pb zircon dating results indicate that the Gangou augen granitiods were formed at 428 ±10 Ma, and the fine-grained granitoids were emplaced at 361–368 Ma. These geochemical and U-Pb zircon data have significant implications for the timing of closure of the Mishigou-Gangou Ocean and the evolution of the Central Tianshan orogenic belt. Supported by the National Natural Science Foundation of China (Grant Nos. 40234045 and 40473030)
%K SHRIMP dating
%K granitoids
%K Gangou
%K Xinjiang<br>测定年龄
%K 小虾
%K 地域
%K 天山
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=01BA20E8BA813E1908F3698710BBFEFEE816345F465FEBA5&cid=96E6E851B5104576C2DD9FC1FBCB69EF&jid=DD6615BC9D2CFCE0B6F945E8D5314523&aid=1A128F751D350BF58E60464BEB6591DF&yid=A732AF04DDA03BB3&vid=286FB2D22CF8D013&iid=708DD6B15D2464E8&sid=5D9E227628843A85&eid=CA590345B99F3387&journal_id=1001-6538&journal_name=科学通报(英文版)&referenced_num=0&reference_num=53