%0 Journal Article
%T Ar-Ar age, geochemistry and petrogenesis of Late Mesozoic volcanic rocks in the northern marginal region of Erlian basin, Inner-Mongolia.
二连盆地北缘晚中生代火山岩Ar-Ar年代、地球化学及构造背景
%A CHEN ZhiGuang
%A ZHANG LianChang
%A WU HuaYing
%A ZHOU XinHua
%A LIU Qing
%A
陈志广
%A 张连昌
%A 吴华英
%A 周新华
%A 刘庆
%J 岩石学报
%D 2009
%I
%X The studied area is located in the northern margin of Erlian basin, NE of China. The Late Mesozoic volcanic rocks in this area are mainly composed of rhyolite, basalt, trachy-basalt and basaltic andesite. 40Ar-39Ar dating of Chagannuoer Formation rhyolite and Bulagenhada Formation basaltic andesite give a plateau age of 141.57±1.59Ma and 129.05±1.86Ma, respectively, indicating that these volcanic rocks were formed in Early Cretaceous. The geochemical characteristics of the volcanic rocks show that the earlier Chagannuoer Formation rhyolites origined from lower crustal magma, which experienced high degrees fractional crystallization or assimilation and fractional crystallization. The magma origination of Daotenuoer Formation rhyolites were middle-upper crust or lower crustal magma suffered strong asiimilation of upper crust. Bulagenhada Formation basic volcanics origined from the metasomatized lithospheric mantle modified by previous subducted ocean slabs, and Combining previous studies, we suggest that the tectonic environment of Early Cretaceous was intense lithopheric extension and thinning, related to Northern China lithopheric thinning geological event in Late Mesozoic.
%K Early Cretaceous volcanic rocks
%K Extensional tectonic setting
%K Subducted ocean slab fluid metasomatism
%K Enriched lithospheric mantle
%K Northern margin region of Erlian basin
早白垩世火山岩
%K 陆内伸展
%K 俯冲流体交代
%K 富集岩石圈地幔
%K 二连盆地北缘
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=2013B5467E3054B1614CEC199353FCED&aid=C4724788EBBED9CE5693FB2BA0DBDA1C&yid=DE12191FBD62783C&vid=C5154311167311FE&iid=0B39A22176CE99FB&sid=E42CAFB11D4BE21A&eid=85002451B65CE0D1&journal_id=1000-0569&journal_name=岩石学报&referenced_num=2&reference_num=80