The Geochemical Characeristics And Deposit Genesis Analysis Of Huang Yangshan Graphite Deposit In Qi Tai County Of Xinjiang Autonomous Region

Huang Yangshan graphite ore in Qi tai county of Xinjiang Autonomous Region is located in Su Jiquan-Tu erkuli crystalline graphite metallogenic belt,The ore lithology mainly is fine grained porphyritic granite mixed with graphite,the graphite appears as crystalline scales.The exposure granite in typical ore deposit area,it belongs to aluminum A-type granite,it is characterized by high Si,low Al,poor Ca and Mg,rich alkali.Nd modle age of A-type granite in northern Xinjiang is compliance with the age of oceanic crust by recorded of ophiolite suite in East Junggar.The?Nd?t?values of Huang yangshan alkali granite is less 3⁴ units than plagiogranite with the characteristic of oceanic plagiogranite in southeast of Huang yangshan alkali granite,the ratio range of Sm/Nd?La/Nb?Ba/Nb?Th/Nb in trace elements,It indicates granite magma from crust-mantle mixing magma,and crustal magma mix with the relic of the ocean crust.The LA-ICP-MS zircon U-Pb dating all suggest that the coincidence between²⁰⁶Pb/²⁰⁸U value is 298±6Ma and research achievement of our predecessors,to explain metallogenetic epoch of graphite ore was late carboniferous,the granite formed in tectonic setting of post-collision.The?¹³C values of graphite measured by our predecessors,this value between-21.3‰ and-23.9‰,and I deduced that Huang Yangshan graphite carbon deried from organiccarbon,it belongs to continental facies or marine facies organic matter.During the tectonic setting of post-collision,crust-mantle mixing magma experienced underplating along the fracture of Qi shui-Su Jiquan,and capture stratum carbonic in this time.The rock carbonaceous gradually becomed round or ellipse,C was transumutatived into graphite under high engine temperature and pressure conditions,and form vast spheroidal graphites in magma boling condtion.Huang Yangshan graphite deposit belongs to magmatic hydrothermal type.