%0 Journal Article
%T Geochemistry, zircon U-Pb chronology of the Triassic granites in the Changning-Menglian suture zone and their implications<br>滇西昌宁-孟连带三叠纪花岗岩地球化学、年代学及其意义
%A NIE Fei
%A DONG GuoChen
%A MO XuanXue
%A ZHU DiCheng
%A DONG MeiLing
%A WANG Xia
%A <br>聂飞
%A 董国臣
%A 莫宣学
%A 朱弟成
%A 董美玲
%A 王霞
%J 岩石学报
%D 2012
%I 
%X Located in the middle and north sections of Changning-Menglian suture zone,Lailitoushan,Yunling and Gengma plutons are mainly composed of monzogranites.The zircon LA-ICP-MS U-Pb dating indicates that the three granitoid plutons intruded simultaneously at about 231Ma.The three plutons have 65.65% ～ 67.68% SiO2,with high K2O(K2O/Na2O = 2.71% ～ 1.42%) and low CaO(1.35% ～ 2.98%).These granitoids are high in A/CNK(1.10 ～ 1.22),and are enriched in Rb,Ba,Th,U,K,La and LREE,but depleted in Nb,Ta,Ti,Zr and Hf.These geochemical signatures indicate that the three plutons are high-K calcalkaline peraluminous S-type granites.The wide and negative zircon εHf(t) values(-26.8 ～-8.2) and ancient Hf-isotope crust model ages(1.2 ～ 2.7Ga) indicate that these three plutons originated mainly from anatexis of ancient crust materials(such as feldspar-and biotite-bearing lithic greywacke) with varying contributions of mantle-derived materials.These plutons probably formed in a post-collisional setting,which may imply that the Burma-Thai-Malaysia microcontinent collided with the Simao block before 232Ma(prior to Late Triassic).
%K Changning-Menglian suture zone
%K Zircon U-Pb ages and Hf isotopes
%K Geochemistry
%K Petrogenesis
%K Tectonic significance<br>昌宁-孟连带
%K 锆石U-Pb年龄和Hf同位素
%K 地球化学
%K 岩石成因
%K 构造意义
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=2013B5467E3054B1614CEC199353FCED&aid=480439D8C603FECA06E31B6733B4AC67&yid=99E9153A83D4CB11&vid=D3E34374A0D77D7F&iid=94C357A881DFC066&sid=4D36A7D6CAFA227E&eid=8D1ED028DF2147F4&journal_id=1000-0569&journal_name=岩石学报&referenced_num=0&reference_num=57