Geochemical Characteristics and Its Significance of Early Carboniferous Intrusive Rocks in Wunule Region of Northeast Inner Mongolia
The petrogeochemistry is of great significance for the indication of magma source and formation environment.the petrogeochemical characteristics of the early Carboniferous intrusive rocks in Wunuer area,northeastern Inner Mongolia are systematically studied.It is characterized by high silicon(49.86％～69.16％),high alkali(3.35％～7.81％),low magnesium(0.36％～5.24％)and low iron(3.51％～11.46％),belonging to the peraluminous calc-alkaline series granite.The intrusion is relatively enriched in light rare earth and has obvious negative Eu anomaly.Thetrace elements of Rb,U,K,Nd,Hf are relatively enriched,the Ba,Nb,Sr,P,Zr,Tiare relatively depleted,which belongs to"S"type granite.The source material of rock mass mainly comes from the partial melting of the upper crust material,and a little part comes from the mixing of the lower crust material.The emplacement mechanism of the intrusion has the indicative polarity from northwest to southeast from the continent to the ocean,and has the characteristics of the granite association of the tectonic magmatic belt of the continental arc,which is the product of the active continental margin in the late orogenic period.
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