The Geologic Feature And Tectonic Significance Of Wuertugaolemiao Granitic Pluton In Inner Mongolia Siziwangqi

Wuertugaolemiao granitic pluton is located in the Hyperplasia of north of north China plate. The paper aims at investigation of the field geological and through the analysis of Wuertugaolemiao granitic pluton in petrology, petrography, major elements, trace elements and REE geochemistry, the author discusses the types of rocks and rock series, the magma source, rock tectonic setting and tectonic significance,and so on.The main type of the rock of Wuertugaolemiao pluton is biotite monzonitic granite. Rock mass can be divided into centeral facies, transition facies and marginal facies. Each facies is similar in lithology and mineral composition. However, they have different structures---fine grained structure, grain structure, porphyritic texture from the marginal to the centeral facies. This reflects the process of gradual condensation crystallization from the edge to the center after magma is in place. Wuertugaolemiao pluton with high Si,Al low Ca, Ti, Mg, Mn, Fe, P, etc., is the high-K calc-alkaline peraluminous granites. There is the lower trace elemen-ts Y and the higher Sr/Y in the pluton. In the spider diagram of trace element,it reveals that large ion lithophile element of Sr、Ba、Rb、K are relative enrichment and high field-strength element are relative defect. These indicate that the residu-es of rock mass may be eclogite,which of Main mineral composition is hornbl-ende.HREE are lower in rock,characteristic parameters Yb/Y values close to10,(Ho/Yb) N value closer to1,REE partition pattern figure show more gently heavy rare earths on the partition type.This shows that the rock mass residual ph ase for Angle ShanLiu pyroxenite. Composition is given priority to with hornble nde, there is a certain amount of garnet.The geochemical characteristics of rock mass of UertuGaoleMiao is outsta-nding performance inthat the Si content and the Al content is high,the Mg conte nt is low,the Y and Yb is poor,the Sr is rich,the Eu is unanomalous and so on. Ro ck mass rock series is high in potassium calc-alkaline series.These state clearly t hat the rock mass of UertuGaoleMiao is C Mr Tak quality of rock mass.Compositing geochemical characteristics and the background of regional geological, the writer thinks, the collision of the North China Plate and the Siberian plate causes the Wuertugaolemiao area formed thickened basaltic Lower Crust. The Adakit magma which produced by Partial Melting of basaltic rocks in Lower crustal under the conditions of high temperature and pressure rises along weak-tectonic zone. It formed Wuertugaolemiao Adakitic granite pluton and remained amphibolite-eclogite relicts including mainly amphibole and partly garnet.Wuertugaolemiao pluton is located in a Adakit magmatic Belt which western pluton mass was formed early in the eastern pluton under the same tectonic setting. This shows that the North China Plate and the Siberian plate collided from west to east gradually. This also provides evidence for Paleo-Asian Ocean closed in scissors from west to east gradually in Late Paleozoic.Petrology, petrography and geochemical characteristics studies of Wuertugaolemiao rock provides evidence for Paleo-Asian Ocean closed.