%0 Journal Article
%T Zircon U-Pb ages and Hf isotopes of granites in Longzhen area and their geological implications<br>龙镇地区花岗岩锆石U-Pb年龄和Hf同位素及地质意义
%A ZHANG YanLong
%A GE WenChun
%A GAO Yan
%A CHEN JingSheng
%A ZHAO Lei
%A <br>张彦龙
%A 葛文春
%A 高妍
%A 陈井胜
%A 赵磊
%J 岩石学报
%D 2010
%I 
%X Longzhen granites, which locate in the boundary area of Great Xing'an Range and Lesser Xing'an Range Mts,belong to the A-I granite belt between the Xing'an and Songnen blocks. The rock assemblages of this area are generally similar, mainly comprising granodiorite and monzonite granite, with geochemical characteristics of high-K calc-alkaline I-type granite series. The U-Pb ages obtained by zircon LA-ICP-MS dating indicate that the Zhengdashan, Molabushan and Chaoyanglinchang plutons were emplaced at 320~315Ma,169±3Ma and 187~171Ma, respectively. The emplacement of these granites was related to the block-amalgamation during the closure of the Paleo-Asian Ocean in Paleozoic and the tectonic evolution of Paleo-Pacific in Mesozoic. Zircon Hf isotopic features indicate that the source rocks of the two episodes of granites are igneous rocks which originated from depleted mantle of Neoproterozoic-Phanerozoic time. Combined with previously published data of Sr-Nd-Hf isotopes, it is concluded that the time of crustal growth of Xing'an Block was mainly in the Neo-Proterozoic and Phanerozoic, which is consistent with that of the Songnen Block. However, it is younger than that of Ergunna Block (Middle- to Neo-Proterozoic),that is, these blocks have different evolution histories.
%K Granites in Longzhen area
%K Zircon U-Pb age
%K Hf isotopes
%K Geological implications<br>龙镇地区花岗岩
%K 锆石U-Pb年龄
%K Hf同位素
%K 地质意义
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=2013B5467E3054B1614CEC199353FCED&aid=AC353E8C583F7776596079B09161B6A9&yid=140ECF96957D60B2&vid=96C778EE049EE47D&iid=E158A972A605785F&sid=A326383D2F3B3AB0&eid=F79A45851FD04E0C&journal_id=1000-0569&journal_name=岩石学报&referenced_num=4&reference_num=53