Research On The Relationship Of Breakage,Alteration And Mineralization In A Shawayi Gold Deposits Of A Heqi County

A shawayi gold deposit is located in A Heqi County territory Kirgiz Autonomous Prefecture Xinjiang.The tectonic belt belongs to the northern margin of the Tarim plate of the southern Tianshan metallogenic belt,The north-south east side has a large fault in the area-the large break of the Cara Tieq,of which trend is in the north east.The ore-bearing strata of the A shawayi gold deposit are mainly the remaining sandstone and glauberite strata or interbeds in the lower Carboniferous Karazurga Formation.The oremaking is mainly developed at 10 ° angle with the formation in the crushing zone,and the silicification,sericite,pyrite mineralization,limonite mineralization,Alteration type of gold deposit.Alteration from the center to the sides are divided into yellow iron sericite zone,quartz sericite zone,sericite zone.The metallogenic process is divided into metamorphic hydrothermal and epoxidation.The metamorphic hydrothermal period is divided into three metallogenic stages,including quartz-pyrite,polymetallic sulphide-quartz and quartz-carbonate phases,and with the early,middle and late rock alteration stages Corresponding.Silicified,yellow iron sericite lithography is positively correlated with Au mineralization,which is closely related.The fluid inclusions collected from the quartz veins in the near ore or orebodies are divided into: NaCl-H2 O,CO2-rich,CO2-saline,inclusions of mineral minerals,which contain very few inclusions.The homogeneous temperature of NaCl-H2 O inclusions is in the range of 170~220? and 240~340?.The average temperature is concentrated at 200? and 280?.The salinity is 0~10wt% NaCleq.The density is 0.768~0.817g/cm3.The pressure changes between 0.39~1.19×10-7Pa.The total homogeneity temperature of inclusions containing CO2 type is concentrated at 200?~320?.The part of homogeneous temperature is 18.5~25.1?.The salinity is 2.62~8.55wt%NaCleq.The initial solution temperature is-56.8~-61.9 ?,indicating that containing CH4 or N2.?18OV-SMOW is 18.1‰~19.5‰,?18O water value is mainly concentrated in between 1.5 ‰~4.8 ‰,?DPDB is-81.3‰~-73.4‰.The anomaly of regional geochemical elements shows that the abundance of Au in the unconsolidated sandstone and phyllite is higher than the regional average,and ?34S is 17.8‰~19.2‰.Based on the study of stratigraphic horizons,tectonic activity,alteration characteristics and mineralization,fluid inclusion temperature measurement and isotope tracing,it is shown that the sub-fault control of the A shawayi gold deposit is mainly affected by regional large fracture.Developed in the crushing zone,mineralization hydrothermal fluids are low temperature,low pressure,rich in CO2 hydrothermal,mainly from the deposition of construction water,and mixed with a small amount of atmospheric precipitation,ore-forming material from the formation,proved that the A shawayi gold deposit is broken-alteration rock type gold deposit.This paper summarizes the prospecting signs such as the fault zone,the silicification of the surrounding rock,the lithotrophic alteration of the siltite,the intermixing of the residual sandstone and the clathrate intercalation or contact zone,and the anomalous region of the arsenic and antimony element.The ore body is developed in the crushing zone.The mineralization hydrothermal fluids are low temperature,low pressure and rich CO2 hydrothermal fluids,mainly from sedimentary water and mixed with a small amount of atmospheric precipitation.The ore-forming materials are from the strata,Belonging to the crushed-alteration type gold deposit.I has summarized the prospecting signs such as the fracture zone,the silicification of the surrounding rock,the lithotrophic alteration of the siltite,the intermixing of the residual sandstone and the clathrate intercalation or contact zone,and the anomalous region of the arsenic and antimony element,and established a prospecting model in this paper.