本文選題：金礦床　切入點：破碎蝕變　出處：《新疆大學(xué)》2017年碩士論文

【摘要】：阿沙哇義金礦床地處新疆柯爾克孜族自治州阿合奇縣境內(nèi),大地構(gòu)造屬于塔里木板塊北緣活動帶的南天山成礦帶,其北南東側(cè)為有一條區(qū)域大斷裂——卡拉鐵克大斷裂,呈北東走向。阿沙哇義金礦床賦礦地層主要是上石炭系喀拉治爾加組下段的變余砂巖和千枚巖巖層或互層。礦區(qū)內(nèi)破碎蝕變帶發(fā)育,礦體主要以10°交角與地層斜交產(chǎn)出于破碎帶內(nèi),產(chǎn)出有硅化、絹云母化、黃鐵礦化、褐鐵礦化、毒砂化等常見金礦床蝕變類型。蝕變由中心向兩側(cè)分為黃鐵絹英巖化帶、石英絹云母帶,絹云巖化帶。成礦過程分為變質(zhì)熱液期和表生氧化期,其中變質(zhì)熱液期又分為三個成礦階段,分別包括石英-黃鐵礦、多金屬硫化物-石英、石英-碳酸鹽階段,并與早、中、晚三個圍巖蝕變階段相對應(yīng)。硅化、黃鐵絹云英巖化與Au礦化呈正相關(guān),而且關(guān)系緊密。采自近礦或礦體中石英脈的流體包裹體分為:水溶液型、富CO2型、H2O-CO2型、含子礦物的包裹體,其中含子礦物的包裹體極少。水溶液型包裹體均一溫度在170~220℃和240~340℃兩個區(qū)間范圍,平均溫度集中在200℃和280℃,鹽度0~10wt%NaCleq,密度0.768~0.817g/cm3,壓力變化0.39~1.19×10-7Pa之間;含CO2型的包裹體完全均一溫度多數(shù)集中在200℃~320℃,部分均一溫度在18.5~25.1℃,鹽度在2.62~8.55wt%NaCleq,初溶溫度為-56.8~-61.9℃,含CH4或N2。δ18OV-SMOW為18.1‰~19.5‰,δ18O水值主要集中在1.5‰~4.8‰之間,δDPDB為-81.3‰~-73.4‰。區(qū)域化探元素異常顯示該區(qū)的變余砂巖和千枚巖中Au的豐度值比區(qū)域平均值高,δ34S值17.8‰~19.2‰。通過對地層層位、構(gòu)造活動、蝕變特征與礦化關(guān)系、流體包裹體測溫等研究并結(jié)合同位素示蹤,說明了阿沙哇義金礦床主要受區(qū)域大斷裂的次級斷裂控制,礦體發(fā)育在破碎帶中,成礦熱液屬低溫、低壓、富CO2的熱液,主要來自沉積建造水,并混入少量大氣降水,成礦物質(zhì)來自地層,證明了阿沙哇義金礦床屬于破碎-蝕變巖型金礦床�？偨Y(jié)了斷層破碎帶、圍巖硅化、黃鐵絹云英巖化蝕變、變余砂巖與絹云千枚巖互層或接觸部位破碎帶、金砷銻元素異常區(qū)等找礦標(biāo)志,并建立了找礦模型。
[Abstract]:Ashawayi gold justice bed is located in the territory of Akeqi County, Xinjiang Kirgiz Autonomous, belonging to the northern margin active tectonic belt of the Tarim plate of the South Tianshan metallogenic belt, the North South East is a regional fault - Kalatieke fault, was the north east direction. Asawahyi Kim deposits stratum is mainly in the Kalazhierjia group section metaclastics and phyllite interbedded strata or alteration zone. In the mining area development, mainly in the 10 degree angle of orebody formation and skew produced in the fracture zone, output silicification, sericitization, pyritization, limonite, arsenopyrite and other common alteration type gold deposit alteration. From the center to the two sides divided into beresitization zone, quartz sericite zone, sericite alteration belt. The mineralization process divided into metamorphic hydrothermal stage and supergene oxidation stage, the metamorphic hydrothermal period is divided into three mineralization stages, including quartz Pyrite and polymetallic sulfide quartz, quartz carbonate stage, and early, in late three, rock alteration stages. Silicification, greisenization and Au Huang Tiejuan were related closely. The mineralization, and the recovery of fluid inclusions from near ore or ore quartz veins in the water solution type is divided into: rich, CO2 type, H2O-CO2 type, inclusions containing Daughter Minerals, including inclusions containing daughter minerals are rare. The water solution type inclusions in 170~220 C and C 240~340 two range, the average temperature in 200 degrees and 280 degrees, the salinity density of 0.768~0.817g/cm3, 0~10wt%NaCleq, 0.39~1.19 * 10-7Pa between the pressure change CO2; inclusion type most complete homogenization temperature at 200 DEG ~320 DEG, homogeneous temperature at 18.5~25.1 Deg. C, salinity in 2.62~8.55wt%NaCleq, initial solution temperature of -56.8~-61.9, containing CH4 or N2. 8 18OV-SMOW 18.1 per thousand ~19.5%, 18O value of main water. From 1.5 to% ~4.8%, -81.3% ~-73.4% ~ DPDB. Regional geochemical element anomaly in this area shows the abundance of metaclastics and Au in phyllite in the average value is higher than the regional 34S values of 17.8 per thousand ~19.2 per thousand. The strata, tectonic activity, alteration and mineralization characteristics. Measurement of fluid inclusions and other research combined with isotope tracer, the control of secondary fracture ashawayi gold justice bed mainly by regional faults, ore bodies developed in the fractured zone of the ore-forming fluid is a low temperature, low pressure, hot liquid rich CO2, mainly from sedimentary formation water, and mixed with a small amount of precipitation, the ore-forming material from the formation, proved ashawayi gold justice bed belongs to the broken altered rock type gold deposit. Summarizes the fault fracture zone, Huang Tiejuan rock silicification, greisenization alteration, metaclastics and sericite phyllite interbedded or contact area of fracture zone, gold and arsenic antimony anomaly area etc. The ore prospecting marks are found and the ore finding model is set up.

【學(xué)位授予單位】：新疆大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：P618.51

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本文編號：1714192