本文選題：內(nèi)蒙古 + 維拉斯托��； 參考：《吉林大學》2017年碩士論文

【摘要】：維拉斯托鉛鋅礦床位于內(nèi)蒙古赤峰市克什克騰旗白音查干境內(nèi),發(fā)育在大興安嶺南段西坡成礦帶內(nèi)。本文在整合分析前人研究成果的基礎上,對維拉斯托鉛鋅礦床的地質(zhì)特征進行了總結,詳細研究了礦床流體包裹體的特征,通過研究流體包裹體巖相學、顯微測溫學和地球化學性質(zhì),討論了成礦流體來源、地球化學特征及演化,深入總結了礦床成因。礦區(qū)內(nèi)出露地層相對簡單,除第四系外,僅出露寶音圖組下巖段黑云斜長片麻巖、少量石炭系石英閃長巖;研究區(qū)內(nèi)構造特征與區(qū)域構造特征相似,礦區(qū)內(nèi)有多期褶皺、斷裂構造,礦體受到斷裂控制的特征十分明顯,主礦體嚴格受近東西向的“S”型壓扭斷裂控制;礦區(qū)內(nèi)巖漿巖主要為石炭紀的石英閃長巖脈和海西期侵入巖。根據(jù)礦體構造、礦石構造以及礦物共生組合,將維拉斯托鉛鋅礦床熱液的礦化作用過程劃分為三個階段,Ⅰ石英-毒砂-黃鐵礦階段;Ⅱ多金屬硫化物-石英階段;Ⅲ石英-碳酸鹽階段。通過對蝕變類型及其分布規(guī)律的分析得出,維拉斯托鉛鋅礦床存在多種圍巖蝕變,如硅化、綠泥石化、絹英巖化、高嶺土化等,其中硅化和綠泥石化與礦石的形成密切相關。根據(jù)流體包裹體研究,維拉斯托礦床自早階段到晚階段流體包裹體類型以富液相包裹體為主,同時含有富CH4包裹體以及含CH4-CO2的包裹體,均一溫度和鹽度逐漸降低,并顯示成礦流體具有中溫、低鹽度和低密度的特點。I階段包裹體完全均一溫度為243.1℃~398.5℃,鹽度為4.8~12%NaCleqv;II階段包裹體均一溫度為190.0~331.1℃,鹽度為3.5~9.1%NaCleqv;III階段包裹體均一溫度為180.0~240.0℃,鹽度為3.7~6.7%NaCleqv。激光拉曼光譜分析包裹體成分主要為CO2、CH4和H2O。氫、氧同位素分析結果表明維拉斯托鉛鋅礦床的成礦流體具有巖漿水和大氣降水的混合特征。礦石中金屬硫化物硫、鉛、碳同位素的分析研究表明,維拉斯托δ34S眾值集中在0值附近,這符合巖漿硫的特征,故而認為成礦物質(zhì)具有深源的特點;維拉斯托礦石鉛同位素投影點均在造山帶增長線上或其下方,這種趨勢線被認為是造山模式的一種特征,且說明礦石鉛源于地�；蛳碌貧�,具有混合來源的特征。礦石中δ13CPDB的值介于-19.7‰~-19.1‰之間,綜合包裹體中的甲烷成分,本文認為流體中的碳同位素具備水巖反應和巖漿混合的來源特征。維拉斯托鉛鋅礦是一個典型中溫熱液脈型礦床,結合大興安嶺南段在早白堊世的構造演化史,本文認為,在造山伸展的環(huán)境中,本區(qū)地幔(下地殼)巖漿熱液,沿著斷裂構造裂隙上侵過程中不斷與圍巖發(fā)生反應,形成含礦熱液。后期又有大氣降水參與,發(fā)生了水巖反應,生成CH4等有機質(zhì);隨著溫度壓力等外部條件的變化,含礦熱液中的成礦元素最終在成礦有利部位富集成礦。
[Abstract]:The Vilas lead zinc deposit, located in the Baiyin Chagan, Hexigten Banner, Chifeng, Inner Mongolia, is developed in the western slope metallogenic belt of the southern part of Greater Khingan Range. Based on the integration and analysis of the previous research results, the geological characteristics of the Vilas lead zinc deposit are summarized, the characteristics of the fluid inclusions in the deposit are studied in detail, and the flow of the fluid is studied. The petrography, microthermometry and geochemical properties of the body inclusions are discussed. The origin of ore-forming fluid, the geochemical characteristics and evolution are discussed, and the genesis of the ore deposits is summarized. The exposed strata in the mining area are relatively simple, except for the quaternary system, only out of the lower rock segment of the exposed treasure map group, a small amount of Carboniferous quartz diorite, and the study area in the study area. The characteristics are similar to the regional tectonic features. There are multi stage folds in the mining area, fracture structures and ore bodies are characterized by fracture control. The main ore body is strictly controlled by the near East-West "S" type compression and torsion fracture; the magmatism in the mining area is mainly Carboniferous quartz diorite vein and Hercynian intrusive rock. In the symbiotic combination, the mineralization process of the hydrothermal fluid in the Vilas Tor lead-zinc deposit is divided into three stages, I. quartz - arsenopyrite phase, II polymetallic sulphide quartz phase, and III quartz - carbonate stage. Through the analysis of alteration types and distribution rules, there are a variety of wall rock alteration, such as silicification, in the Vera stow lead zinc deposit. Green mud petrochemistry, sericite and KAOLINIZATION are closely related to the formation of silicification and chlorinization. According to the study of fluid inclusions, the type of fluid inclusions from the early to late stages of the Vilas bearing deposit are mainly rich in liquid inclusions, including rich CH4 inclusions and CH4-CO2 inclusions, and homogenization temperature and salinity. Gradually decreasing and showing that the metallogenic fluid has the characteristics of medium temperature, low salinity and low density, the complete homogenization temperature of the.I phase inclusions is 243.1 ~398.5 C, the salinity is 4.8~12%NaCleqv, the homogenization temperature of the inclusions in the II phase is 190.0~331.1, the salinity is 3.5~9.1%NaCleqv, the homogeneous temperature of the inclusions in the III phase is 180.0~240.0 C, and the salinity is 3.7~6.7%NaCleqv. The composition of the inclusions is mainly CO2, CH4 and H2O. hydrogen. The results of oxygen isotope analysis show that the ore-forming fluid of the Vilas lead zinc deposit has a mixture of magmatic water and atmospheric precipitation. The analysis of sulphur, lead and carbon isotopes of metal sulfide in the ore shows that the value of Vilas Delta 34S is concentrated near the 0 value, which conforms to this. The characteristics of the magma sulfur, therefore, think that the metallogenic material has the characteristics of deep source; the lead isotope projection points of the Vilas bearing ore are all on the orogenic belt growth line or below it. This trend line is considered to be a characteristic of the orogenic model and that the ore lead is derived from the mantle or lower crust, with the characteristics of mixed sources. The value of the delta 13CPDB in the ore is in the middle of the ore. In this paper, the carbon isotopes in the fluid are considered to have the characteristics of water rock reaction and magma mixing. The Vilas lead and zinc deposit is a typical medium temperature hydrothermal vein type deposit, combined with the early Cretaceous evolution history of the southern part of Greater Khingan Range, which is considered to be in the environment of orogenic extension. In this area, the mantle (lower crust) magmatic hydrothermal fluids constantly react with the surrounding rock during the fracture process of fracture tectonic fractures to form ore bearing hydrothermal fluids. In the later period, there is a water and rock reaction and the formation of CH4 and other organic matter, with the participation of precipitation in the later period, and the mineralization elements in the ore bearing hydrothermal fluid eventually are in the favorable part of the mineralization with the change of the external conditions such as temperature and pressure. Rich integrated ore.
【學位授予單位】：吉林大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P618.4

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