GEOLOGICAL CHARACTERISTICS AND TECTONIC SIGNIFICANCE OF GONGHUDUGE GRANITE ROCK BODY IN SIZIWNAGQI, INNER MONGOLIA
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摘要: 公呼都格岩体位于中朝陆台北缘,侵入于奥陶系,被晚古生代晚期花岗岩侵入.黑云母K-Ar年龄测定为306.4 Ma,属晚古生代中期的花岗岩.岩体主要岩石类型为花岗闪长岩及英云闪长岩,以发育富铁黑云母、属过铝质岩石为特征.SrI为0.7162,为S型壳源花岗岩.其形成于中朝板块与西伯利亚板块对接后期的超碰撞造陆阶段,产出部位受深断裂控制.Abstract: The Gonghuduge granite rock body, which is tectonically located in the north margin of Sino-Korean platform,intruded Ordovician strata and was intruded by late Late Paleozoic granite. The K-Ar dating (306.4 Ma) of biotite shows that the rock is formed in the middle stage of Late Paleozoic era. The rock body is composed of mainly granodiorite and quartz-mica diorite. It is characterized by peraluminous rock, with high-Fe biotite. The Gonghuduge rock body belongs to crust-derived granite of S-type, formed in the post-collision-epirogenic movement in the later stage of the convergence of Sino-Korean and Siberian plates. The occurrence of the Gonghuduge granite is controlled by deep fault.
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Key words:
- granite /
- S-type /
- the middle stage of Late Paleozoic /
- post-collision /
- Central Inner Mongolia
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