The Characteristics Of Geological ?Geochemistry And Genetic Analysis Of Ashawayi Gold Deposit In Southwest Of Tianshan

The southwest Tianshan Mountain is located at the southwest end of the Central Asian orogenic belt.The developed Au-Sb-Sn-Hg metallogenic belt is one of the most important gold metallogenic belts in the world.At present,there are more than a dozen large and super-large gold deposits have been ver-ified and are known as the"Asian gold belt".Asha Wayi gold deposit is lo-cated in the central part of the southwest Tianshan Mountain orogenic belt in Xinjiang,the Bulong-Maidan-Tuoyun Au-Cu metallogenic belt is the second lar-gest gold deposit discovered in the southwest Tianshan Mountain area of Chi-na in recent years.At present,the discovered gold resources have reached alarge scale.It is the largest gold deposit in the Bulong-Maidan-Tuoyun Au-Cu metallogenic belt and has a distinct representation in the southwest Tian-shan Mountain orogenic belt.However,the research on the basic geology and the genesis of the ore deposit is not deep enough,which seriously restricts the b-reakthrough of ore prospecting in the next step.In this paper,detailed fieldgeological investigation,systematic sample collection,detailed petrographic,mi-neralogical and fluid inclusion microscopic analysis of the samples are carried out.Combined with EPMA,SEM,microthermometry of fluid inclusions,Laser Raman spectroscopy and C-H-O-S isotopic measurement,the geological charact eristics,geochemical characteristics and genesis of the ore deposit are systemati cally dissected.Acquire the following awareness:1?The location of the ore deposit is controlled by the Maidan-Tawu trend-ing along NE,the large faults of Kalatiebieke and Kalatieke,and the lower member of the C₂k formation.The size and shape of the ore body are control-led by the scale and occurrence of the secondary thrust fault.2?The gold bearing minerals of the ore deposit are mainly pentagonal do decahedral crystal pyrite or pentagonal dodecahedral and cubic Polymorphic py-rite and a small amount of arsenopyrite.Au occurs in the gold bearing mine-rals with invisible Au.Pyrite with loss Fe and loss S,rich As as characteristic s,with Carlin-type and sedimentary-metamorphic dual characteristics.3?Silicification and pyrite mineralization are closely related to gold mineralizat ion.This can be used as a gold ore prospecting sign.4?There are three types of aqueous inclusion,CO₂-H₂O inclusions and pure CO₂ inclusions developed in the ore-forming fluid inclusions.The ore-for ming fluids are characterized by metamorphic fluids with moderate and low temperature,low salinity,rich in CO₂ and containing a small amount of CH₄and N₂.The pressure of the ore-forming fluid inclusions in the early stage is between 140 MPa and 180 MPa,and the pressure of the ore-forming fluid in-clusions in the middle stage of is between 80 MPa and 150 MPa.It is calcu-lated that the pressure depth of static rock in the early stage of mineralization is 5.5 km⁷.1km and that in the stage of mineralization is 3.1 km⁵.9 km.5?The C-H-O isotope indicates that the ore-forming fluid comes from me-tamorphism,and the precipitation may participate in the late metallogenic stage,S isotope indicates that Au may come from the ore-bearing strata.6?The deposit is defined as"Tianshan type"orogenic-type gold deposit,and the metal-logenic model is metamorphic defluid metallogenic model.The ore prospecting direction should focus on the deep of the mining area and has great potential.