Spatiotemporal Distribution And Mineralization Of Paleozoic Granites In East Junggar

The Central Asian orogenic belt,also known as the Altai structural merging body,is one of the largest accretionary orogenic belts in the world.It has a complete history of post-collision evolution,with strong post-collision structures and magmatic and mineralization activities.East Junggar is located in the hinterland of the Central Asian orogenic belt and is located at the junction of the Siberian plate and the Kazakhstan-Junggar plate and the Tali wood plate.There has been controversy in the academic circles on the structural evolution of the East Junggar area.It can better explore its tectonic evolution process,and by comparing the distribution characteristics of granite and minerals in the area,it can better explain the existing relationship between granite and mineralization.According to previous studies,based on the three granite East Junggar typical of the detailed investigation carried out field,research petrography,geochemistry,zircon U-Pb geochronology and other aspects of the room and through the collection,collation East The zircon U-Pb chronology data,geochemical data,and zircon Hf isotope data of granites in the quasi-regions are used to summarize the spatial and temporal distribution of granite and mineral resources in ArcGIS,and to explore the deep crustal composition and tectonic magmatic evolution of eastern Junggar The coupling relationship between granite and mineral space and time has achieved the following results:1.The LA-ICP-MS zircon U-Pb ages of two granite bodies of the Baxi porphyry copper deposit in the Qiongheba area and one granite body of the Laiklik porphyry copper deposit were obtained respectively The metallogenic ages are 336.7±2.4Ma,337.3±4.1Ma,411.1±2.4Ma.2.The Dolomitic diorite in the Qiyakeba Laikelike porphyry copper(molybdenum)deposit was formed in the Early Devonian(419±3Ma)subduction environment;and the Baxi porphyry copper(molybdenum)ore diorite Rock and granodiorite formed the transition period of the Early Carboniferous(337±2Ma and337±4Ma)tectonic system.According to isotope mapping,the Paleozoic granites in eastern Junggar mainly come from young mantle-derived materials.The isotopiccomposition ?Nd(t)is +1.3?+12.3 and the model age TDM2(Nd)is 1.0?0.4Ga.?Hf(t)value is(+2.2 ? +18.2),TDM2(Hf)is 1.45 ? 0.3Ga.It also shows that the first-line crustal composition along the Zhaheba ophiolite belt may be younger.3.The isotope mapping shows that the Paleozoic granites in East Junggar have high positive ?Nd(t)values(+ 1.3 ? + 12.3)and ?Hf(t)values(+ 2.2 ? + 18.2),and the young model age(TDM2(Nd)= 1.0 ? 0.4Ga,TDM2(Hf)= 1.45 ? 0.3Ga),the young mantle-derived material provides an important source of material,revealing that the deep composition of East Junggar should be mainly young and young crust,and the ancient basement is very little or not.4.East Junggar large-scale mineral development,mainly with acidic magmatism related to copper(gold),gold,tungsten,tin and iron ore as well as a small amount of magma graphite mine,found only north and south sides of the base-ultrabasic Sexually related copper-nickel deposits,such as lead-zinc deposits,lithium deposits and other minerals that are closely related to the source of the crust,have not yet been found.The mineralization age of East Junggar is mainly concentrated in the Silurian-Permian,and a small part is the Early Mesozoic Jurassic.The minerals produced by the Silurian-Devonian are relatively large in scale,mainly distributed in the Ulungu-Zhahe In the area of the Dam-Qionghe Dam,the Carboniferous-Permian deposits(spots)are relatively small in scale,but have a large number and are widely distributed in the region.This is well coupled with the spatial and temporal evolution of granite in the region..