%0 Journal Article
%T Mylonitic potassic granitoids from the Yagan metamorphic core complex on Sino-Mongolian border: a mark of transition from contractile to extensional tectonic regime<br>中蒙边界亚干变质核杂岩糜棱状钾质花岗岩—早中生代收缩与伸展构造体制的转换标志
%A WANG Tao
%A ZHENG YaDong
%A LIU ShuWen
%A LI TianBin
%A MA MingBo
%A <br>王涛
%A 郑亚东
%A 刘树文
%A 李天斌
%A 马铭波
%J 岩石学报
%D 2002
%I 
%X Occurrences of large-scale thrusts and extensional tectonics in Middle and Late-Mesozoic are a striking feature of the tectonics in the North China Block. This paper, however, further recognizes Early Mesozoic mylonitic granites with extensional tectonic setting from the Yagan metamorphic core complex (MCC). a typical representative of extensional tectonics. They have features of potassic or shoshonitic granite types and their tectonic discriminations show extensional setting. The zircon U-Pb dating of the Shuiquangou mylonitic pluton yields 228 + 7Ma. These granitoids were strongly deformed by syn-tectonic magmatic flow and high-temperature solid flow. All these characteristics suggest that adjustment, thinning and extensional deformations at the middle-low crustal levels might have started from the early Mesozoic, i.e. much more earlier than the final formation (Mesozoic) of the large-scale extensional tectonics, i.e. the MCC. Integration of all these characteristics displays a peculiar tectonic dynamic mechanism and setting.
%K Mylonitic granite
%K Syn-emplacement deformation
%K Extensional setting
%K Early Mesozoic
%K Sino-Mongolian border<br>亚干变质核杂岩
%K 伸展构造体
%K 转换标志
%K 糜棱岩状花岗岩
%K 同侵位变形
%K 拉张环境
%K 早中生代
%K 中蒙边界
%K 推覆构造
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=2013B5467E3054B1614CEC199353FCED&aid=5D8780A474389591&yid=C3ACC247184A22C1&vid=13553B2D12F347E8&iid=0B39A22176CE99FB&sid=6425DAE0271BB751&eid=50BBDFAC8381694B&journal_id=1000-0569&journal_name=岩石学报&referenced_num=11&reference_num=34