Discussion On The Age And Genesis Of Magmatic Rock In Uranium-beryllium-molybdenum Deposit In Baiyanghe,Xinjiang

The Xinjiang Baiyanghe deposit is a combination of uranium beryllium molybdenum,and uranium,beryllium and molybdenum both meet the industrial grade volcanic hydrothermal deposit.Its unique element assemblage is rare in the world.The deposit is located in the west Xinjiang Xuemisitan volcano rock belt,tectonic plate in Late Paleozoic mature island arc of the epicontinental active zone in the north margin of the Junggar palte,The main volcanic rocks in the area are acid volcanic rocks,in which they are sandwiched between intermediate and basic volcanic rocks,and the intrusive bodies related to mineralization are mainly Yangzhuang granite bodies,which are ultra shallow subvolcanic rocks.In this paper,through the study of magmatic petrology,U-Pb geochronology and geochemistry characteristics of Baiyanghe deposit in Xinjiang,comprehensive analysis of all aspects of data and research progress,the following main understanding:?1?the results of Baiyanghe area of Xinjiang the magmatite single Zircon LA-ICP-MS U-Pb age showed that the volcano rock?rhyolite?and volcano rock?moyite?age was 416.5±5.1Ma and 416.4±5.4Ma,show that the volcano rocks formed in late Silurian;Yangzhuang rock forming age 367.8±2.7Ma and316.1±3.2Ma,that time Yangzhuang granite porphyry rock is a complex rock forming age for Devonian and Upper Carboniferous Permian,not previously considered.?2?the Baiyanghe area of the granite porphyry rock chemistry and geochemistry of trace elements and REE geochemical characteristics of the results of the study show that the A2 type sub granite porphyry,high silicon,low aluminum,low alkali,poor calcium,magnesium,F,B,CO₂ and other rich volatile,and loss of Sr Ba geochemical characteristics of the U,Be,Mo mineralization is very favorable.Volcanic rocks are formed in the tectonic environment of oceanic transition to continental arc,and Yang Zhuang pluton formed in intraplate tectonic environment.?3?the area of the dyke LA-LCP-MS zircon U-Pb ISOTOPIC AGE formation in the Late Triassic three,the apparent of ²⁰⁶Pb/²³⁸U were:age weighted diorite:217.7±1.6 Ma±0.9 Ma;diabase:203.4±1.9 Ma,216.6±2.4 Ma and 215.5±1.5 Ma,which was later than Yangzhuang granite porphyry,geological facts this latter invasion of the former with the field observation line.?4?the study area the dyke REE chondrite normalized curve is"right"distribution pattern,diorite has a weak negative Eu anomaly,diabase has a weak-obvious positive Eu anomaly;in the mafic dikes with incompatible elements?K,Rb,Ba,Sa,LEE?high enrichment.Field strength elements?Nb,Ta,Ti,Zr,Hf?loss characteristics.That the mafic dikes formed in Late Paleozoic Central Asian orogenic belt in Western Junggar orogenic extensional environment after Baiyanghe area,magma derived from the mantle source of pre-existing residual oceanic subduction zone fluid and melt metasomatism,crust contamination on the rise in the process of emplacement is formed in Mafic Dikes in intraplate tectonic the environment.?5?the Baiyanghe Yangzhuang sub granitic porphyry rock forming age of uranium and beryllium mineralization age there is a certain difference,but the emplacement of shallow,fast cooling,provide favorable sites for primary joint fissure uranium storage.At the time,area of diabase and diorite dikes intruded and uranium metallogenic age age,in space,in the study area,the mafic dikes are relatively well developed in place of uranium,beryllium mineralization,it said a good correlation of veins and mineralization of uranium and beryllium,suggesting close mantle mafic veins the fluid involved in the mineralization of uranium and beryllium.