| The area where Mohexiala is located on the northern slope of the western section of East Kunlun and the southern margin of the Qaidam Basin.The geotectonic unit belongs to the Eastern Kunlun Arc Basin of the Qin-Qi-Kun Orogenic System.The corresponding tectonic location in the area is in the Qaidam Block and Qiman Tower.The junction of the grid block,the corresponding tectonic unit is the Qimantag-Dulan orogenic subzone in the Late Caledonian orogenic belt of East Kunlun.The study area belongs to the Qimantage-Dulan Hualixi period iron,cobalt,copper,lead,zinc,tin,wollastonite,(antimony,bismuth)metallogenic belt,and is a skarn deposit-iron polymetallic in the province The main metallogenic belt of the ore,the geological structural characteristics of this belt have created good conditions for the formation of hydrothermal and contact metasomatic skarn-type polymetallic minerals,and the metallogenic geological conditions are extremely superior.The main exposed stratum is the Baishahe(Rock)Formation.The lithology is mainly gneiss and mixed rock;intrusive rocks are relatively developed,such as flesh-red monzogranite,dark gray diorite,and off-white medium-fine-grained biotite Granodiorite and light flesh red-flesh red medium-fine-grained potassium feldspar granite;the fold structure is not developed in the area,and the faulting is relatively strong,mainly northwest-trending faults.According to the analysis of geochemical characteristics,the content of Au,Cu,Zn,Pb,and W in the strata is relatively high,and it is more likely to be rich in ore;the fault structure in this area is relatively active,laying a certain foundation for mineralization;geochemical anomaly Obviously,the fit is good,indicating a strong position of mineralization;the facts of mineralization in neighboring areas are obvious;at the same time,many gold deposits(chemicals)have been delineated in the study area.The current level of work is relatively low.Further exploration can be used to improve geological formation.The degree of ore background research,so this area has a good prospecting prospect for finding gold polymetallic deposits.Comprehensive research results show that the distribution of ore bodies in the area is closely related to the light flesh red and off-white monzonitic granites of the Indosinian period.The mineralization found so far is produced in the rock body or near the contact zone with the strata.The surrounding rock alterations of the ore bodies in the study area mainly include silicification,sericification,sericitization,and carbonation.According to the above analysis of the geological characteristics of the gold mineralized body,it can be seen that the formation of the gold mineralized body in the study area has the following characteristics: the mineralized body is controlled by the fault structure,and the shape of the mineralized body is simple,which is strip-shaped and vein-shaped;The alteration zone provides ore-conducting and ore-holding space for the later hydrothermal ore formation;the surrounding rock of the mineralized body has strong alteration,mainly hydrothermal erosion,mainly silicification,limonite mineralization,and carbonation,Mostly appear on both sides and near the mineralized body.The exposed strata in the Mohexiala area mainly include the Lower Proterozoic Jinshuikou Group.The ore bodies are mainly produced in veins.The wall rock alteration near the ore mainly includes silicification and sericification.The main metal minerals are magnetite,pyrite,galena,sphalerite and chalcopyrite.The intrusive rocks closely related to mineralization are Late Triassic granite and intermediate-acid dyke rocks.The fluid inclusion test shows that the ore-forming fluids are mainly gas-liquid two-phase inclusions and a small amount of pure liquid inclusions.The first stage of mineralization: the homogenization temperature of the inclusions is 420?440?,and the salinity is 9.5%?11.5% Na Cl eqv.In the second stage,the homogenization temperature of the inclusions is 250?300?,and the salinity is 5%?8% Na Cl eqv.In the third stage,the homogenization temperature is 100?160?,and the salinity is 2.5%?4.5% Na Cl eqv.The main mineralization pressure is estimated to be 7?8MPa,and the mineralization depth is 0.7?0.8km.The sulphur-lead isotopic composition of the ore shows that the mineral comes from deep sources,which may be mainly Late Triassic granites related to mineralization.The natural type of ore is mainly broken zone altered rock type,and the genetic type of the deposit is mid-temperature hydrothermal vein type silver.Polymetallic ore.Based on the analysis of metallogenic geological background,metallogenic geological conditions,geophysics and geochemistry,and prospecting signs,it is believed that the main types of deposits in the area are mid-temperature hydrothermal vein type and skarn type polymetallic deposits,and there are porphyry copper deposits.Prospecting potential. |
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