Geological Characteirstics And Signiifcance Of The Palaeozoic Intrusive In Baluntai Area,the Central Tianshan, Xinjiang

Based on the outcrop area of central Tianshan Baluntai intrusive rocksmacroscopic field geological observations were comprehensive and systematic studypetrographic,geochemical and isotopic age and with the existing chronology ofprevious data,respectively,in the vicinity of intrusive rocks in the central TianshanBaluntai intrusive body established sequence and discuss their structural properties.The central Tianshan Baluntai intrusive rocks found in the region along theapproximate developmental stage of magmatic sequence of four times,namely:MiddleOrdovician-Silurian calc-alkaline subduction-type granites;Middle Silurian mainlyextensional environment within a class showings gneissic granite,syenite granite;lateCarboniferous for the same collision adamellite;late Carboniferous-early Permianwithin the continental extensional environment under syenogranite.By the tectonic evolution of the intrusive rocks, tectonic properties, intrusiveand predecessors of times on the basis of dividing the West Tianshan constructed onthe establishment of the central Tianshan experienced Sinian-Cambrian ancient oceanbasin opening and expansion、Cambrian-Early Ordovician in the central Tianshanoceanic subduction and back arc created South Tianshan Ocean formed; middleOrdovician central Tianshan Ocean closure southern Tianshan oceanic initial startdive; middle Silurian in the northern Tianshan into land the two-way stretch andSouth Tianshan oceanic subduction subduction; Carboniferous formation of oceanicClose unified continent; late late Carboniferous-Early Permian stretch into theevolution of intraplate basic model.