The Geological Characteristics And Significance Of Early Permian Granite In The East Of South Tianshan

Early Permian granite widely developed in the South Tianshan orogenic belt, the existing geological data indicate that the formation of these rock and collision orogeny have close relationship.By analyzing the petrological, geochemical characteristics of Redhill rock in the east of South Tianshan orogenic belt, Yigal the Aiken rock, Torg Mubarak rock and Mangqisu rock,accrording to modern rock genesis theory, to explore the granite features and variation of granite types, source characteristics, petrogenesis and tectonic environment in research area.East of South Tianshan Early Permian granite are mainly monzogranite, syenite granite and granodiorite, which adamellite based.The overall characteristics of major elements were rich silicon, alkali-rich, poor calcium, iron, magnesium, phosphorus, titanium features, is a high-K calc-alkaline series- shoshonite series, metaluminous- too weak aluminum.The magmatic differentiation and evolution degree is more thorough, and the degree of crystallization is higher. Rock on the relevant discrimination diagrams appear as I type granite, but at the same time and has some features A-type or S-type granites.Magma source is the crust mantle mixed type, the residual mineral mainly of amphibole, plagioclase and a small quantity of garnet, ilmenite and ferro phosphorus ore,the remains of Mangqisu rock are mainly garnet.The study area granite is formed in the same collision- collision of tectonic setting, Mangqisu rock formed in the Transitional period of collision of the same backward collisions, Redhill rock, Yigal the Aiken rock,Torg Mubarak rock formed after the collision of tectonic setting, plate collision were from east to west.The main form of rock controlled by the structure fracture, along the regional tectonic line direction batholith, rock dendritic output.The characteristics of rock mass show some regularity in time and space: According to the time sequence, all kinds of intrusions are followed by Monzonite granite, granodiorite and syenite granite intrusion of late;Space in accordance with the order from north to south, granite formed rock exists from the old to the new rules, rock of the exposed area decreasing, rock shapes by large batholith becomes smaller rock branches and even small rock strain. SiO2 content is generally decreasing, rare earth elements the total increase, over rock, iron, magnesium index incremented by the high-K calc-alkaline series to shoshonite series, the degree of separation followed by crystallization increases.Mangwisu rock in this rock variation in performance is not obvious.