%0 Journal Article
%T Geochemistry, SHRIMP Zircon U-Pb Dating and Formation Environment of Dongqiyishan Granite, Inner Mongolia<br>内蒙古东七一山花岗岩地球化学、锆石SHRIMP U-Pb年龄及岩体形成环境探讨
%A 杨岳清
%A 吕博
%A 孟贵祥
%A 严加永
%A 赵金花
%A 王守光
%A 贾玲珑
%A 韩建刚
%J 地球学报
%D 2013
%I 
%X During Paleozoic, the crustal movement was intense in Beishan area, which mainly found expression in the splitting of Early Palaeozoic unified continent and the formation of ocean basin in Middle Ordovician. At the end of Silurian, the oceanic basin was underthrusting in SN direction and was finally closed, that caused the collage between the northern side of the Kazakhstan plate and the southern Tarim plate as well as the formation of a relatively uniform plate. In Late Paleozoic, another movement occurred. From Carboniferous to Permian, the acid-intermediate magmatic intrusions in these areas made up important geological events. The outcropped area of granite occupies 1/3 of the total area. Nevertheless, researchers tend to ignore the crustal movement, especially the intrusion of granitic magma in Devonian period. The authors hold that the volcano-sedimentary and tectonic activities did occur in Devonian, so there existed strong magmatic intrusive activities in these areas in Hercynian period. Petrological and geochemical researches were conducted, and zircon SHRIMP U-Pb dating was performed for three granites, which yielded ages of (355±4) Ma, (359±4) Ma, (355±5) Ma respectively, suggesting that Dongqiyishan granitic batholith was formed in Late Devonian instead of in Middle Hercynian. It is thus thought that the collisional orogenesis in the Beishan Mountain during Early Late Paleozoic was accompanied by strong granitic magma activity, which played an important role in deepening the crustal evolution process of Palaeozoic in Beishan area.
%K granite
%K rock geochemistry
%K zircon U-Pb dating
%K collision orogenesis
%K Hercynian orogeny
%K Beishan<br>花岗岩
%K 岩石地球化学
%K 锆石U-Pb年龄
%K 碰撞造山
%K 海西造山运动
%K 北山
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=621CF755B1A341E5&jid=1DF69A47DE80569EC8F859DF61571180&aid=BE7E4E47A19ED56FF4A69826969DC75B&yid=FF7AA908D58E97FA&vid=339D79302DF62549&iid=0B39A22176CE99FB&sid=D5C9DC4EF2F78008&eid=A58CF3BAE79427D0&journal_id=1006-3021&journal_name=地球学报&referenced_num=0&reference_num=0