Petrologic Characteristics Of Intermediate-acid Small Intrusive Bodies And Comparative Studyof Adakite In Baogutu Area, West Junggar

West quasi Baogutu area located in Kazakhstan quasi Junggar plate tangbale-Kalamaili in Paleozoic island arc belt, in the Variscan intrusive rocks, intermediate acid small rock number, and copper and molybdenum polymetallic mineralization are closely related. The packets of ancient figure in the region I, II, III, V, 4 a representative small acidic rock body in lots of field investigations, combined with petrology, petrography and geochemistry of the theory and method are analyzed in detail and the related magmatic rocks and magma source and rock geochemical characteristics, geological and tectonic background of the formation, also on small intermediate acid rocks and typical adakites were compared, detect small intermediate acid rocks with adakite features the same and belongs to adakite.Intermediate-acid small intrusive bodies of Baogutu area mainly in stone carbon system formed small irruptive rock body, by the early Sn trending fault control, into the old age. The little rock is mainly for Jurassic rock, dikes, minor dyke. The lithology is mainly dominated by the SiO₂, content and 52.01%-69.28% content, and the K₂O+Na₂O content is between 9.50% and 3.67%, which belongs to the calcium alkaline rock.Intermediate acid small rock of Baogutu area LREE relative enrichment, hree flat Dan distribution, showing to right-wing Type Rare Earth gentle curve fitting model, EU positive anomaly and weak negative anomalies, differentiation is weak.Combined with the existing research results and major and trace element studies confirmed, small rock formation generated in subduction of oceanic crust in the island arc environment, by the magmatic source in Mafic lower crust or upper mantle and greywacke in fractional crystallization differentiation formed by partial melting, in the invasion process by crustal contamination, basically have the features of mantl source.Eventually to acid small rock of Baogu area and adakite features were compared and found that they are identical in all respects, such as the tectonicenvironment belong to island arc environment, magmatic source from the lower crust or upper mantle mixed dye is derived from the mantle, rock series belong to calc alkaline rock series, similar in geochemical, combined with the above that small intermediate acid rocks with adakite features. According to the research and understanding of a series of rock chemical characteristics, it is proved that the area has great potential for prospecting.