%0 Journal Article
%T Middle Paleoproterozoic crustal extensional regime in the North China Craton: New evidence from SHRIMP zircon U-Pb dating and whole-rock geochemistry of meta-gabbro in the Anshan-Gongchangling area<br>华北克拉通古元古代中期伸展体制新证据:鞍山-弓长岭地区变质辉长岩的锆石SHRIM PU-Pb定年和全岩地球化学
%A DONG ChunYan
%A MA MingZhu
%A LIU ShouJie
%A XIE HangQiang
%A LIU DunYi
%A LI XueMei
%A WAN YuSheng
%A <br>董春艳
%A 马铭株
%A 刘守偈
%A 颉颃强
%A 刘敦一
%A 李雪梅
%A 万渝生
%J 岩石学报
%D 2012
%I 
%X This paper reports whole-rock geochemistry and zircon geochronology of Middle Paleoproterozoic meta-gabbro from the Anshan-Gongchangling area, eastern North China Craton. Based on geochemical compositions, the meta-gabbro can be divided into two types. Type 1 is high in FeOT and low in MgO, with TREE contents and (La/Yb)N values of 107.5×10-6~114.0×10-6 and 2.6~2.7. They are not obviously depleted in Nb, P and Ti, and show strong depletion in Cr. Type 2 meta-gabbro is high in SiO2 and low in FeOT, showing a higher (La/Yb)N ratio (6.8) and stronger depletion of Nb compared with type 1 meta-gabbro. SHRIMP dating of type 1 meta-gabbro yielded a weighted mean 207Pb/206Pb age of 2110±30Ma for baddeleyite and magmatic zircon and an upper intercept age of ~2.95Ga for trapped zircon. Type 1 meta-gabbro is formed by strong recrystallization-differentiation of mafic magma staying a long period at a deep magmatic chamber, supporting a conclusion that the North China Craton was in an extensional regime during the Middle Paleoproterozoic period.
%K Gabbro
%K Paleoproterozoic
%K Extensional regime
%K SHRIMP dating
%K Anshan
%K North China Craton<br>辉长岩
%K 古元古代
%K 伸展体制
%K SHRIMP
%K U-Pb定年
%K 鞍山
%K 华北克拉通
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=2013B5467E3054B1614CEC199353FCED&aid=B5A25D3BD3FB5FB8CE22507059CD3DF5&yid=99E9153A83D4CB11&vid=D3E34374A0D77D7F&iid=9CF7A0430CBB2DFD&sid=CDDF46CE7362EE12&eid=558ECF0AA61051C6&journal_id=1000-0569&journal_name=岩石学报&referenced_num=0&reference_num=32