發(fā)布時間：2018-05-01 22:55

  本文選題：流體包裹體 + 成礦流體�。� 參考：《成都理工大學》2017年碩士論文

【摘要】：丫他金礦床位于我國黔西南卡林型金礦成礦區(qū)內,而黔西南金礦成礦區(qū)又是我國滇黔桂“金三角”卡林型金礦的礦集區(qū),是我國重要的Au、Hg、Sb、As、Pb-Zn、Ag和多種分散元素產地。黔西南卡林型金礦成礦區(qū)大地構造位置處于揚子陸塊西南緣和右江造山帶的交匯部位,兩個大地構造單元的地質、構造成巖—成礦作用的演化歷程決定了該金礦成礦帶的形成。自上世紀70年代來在黔西南發(fā)現我國最早的卡林型金礦(微細浸染型金礦)以來,相繼在該區(qū)發(fā)現金礦床(點)50多個;截止目前,已探明金礦資源儲量超過500多噸,從該區(qū)的地質、構造、地球物理、地球化學、遙感地質特征反映該區(qū)仍有尋找大型金礦資源的潛力。前人對丫他金礦的礦床地質特征、控礦條件、地球化學特征、金的賦存形式及選礦試驗、礦床成因都有過一定的研究,而對丫他金礦床成礦流體方面的研究卻不夠完善,成礦流體又與礦床成因密切相關。因此,本論文以丫他金礦床的流體包裹體作為研究對象,通過對包裹體進行實驗數據的測試、計算和分析,來進一步判斷丫他金礦床的成礦熱液類型及礦床的成因類型。本論文通過對丫他金礦床野外地質調查,進一步了解了該礦床的成礦地質背景和礦床地質特征。論文中從微觀方面入手,對所采樣品磨制的包裹體薄片進行顯微巖相學觀察和研究、均一法測溫,獲取包裹體中流體的均一溫度和冰點溫度,通過計算進一步得出流體的鹽度、密度、壓力等相關參數,結合前人對該礦床的研究資料,對丫他金礦床的成礦流體性質、流體來源、流體遷移和金的沉淀機制等方面進行了討論,進而判斷丫他金礦的礦床成因類型。本論文主要得出以下幾點認識:丫他金礦床的包裹體有三種類型,主要為氣液兩相包裹體,次為純液相包裹體,三相包裹體最少;包裹體的形態(tài)以不規(guī)則狀、次橢圓狀、橢圓狀及負晶形為主,包裹體大小普遍為3~20μm,純液相包裹體較多為不易觀察的小包裹體。論文中主要選取氣液兩相包裹體進行數據的測試,得到包裹體的均一溫度(101.7~293.3℃)、鹽度(0.35~13.61wt%)、密度(0.75~1.06g/cm~3)、成礦壓力(26.5~73.2MPa)、成礦深度(小于3km)等信息,由此推斷,成礦流體介質水主要來源于沉積建造水(油田水)或大氣降水,該礦床具有淺成中低溫熱液礦床流體的特點,因此,本論文認為丫他金礦其礦床類型為淺成中低溫熱液金礦床。
[Abstract]:The Yata gold deposit is located in the Carlin type gold deposit in southwest Guizhou, and the gold deposit in southwest Guizhou is the ore accumulation area of the "golden triangle" Carlin type gold deposit in Yunnan, Guizhou and Guangxi in China. The tectonic position of the Carlin type gold deposit in southwest Guizhou is located at the junction of the southwestern margin of the Yangtze block and the Youjiang orogenic belt. The evolution of the two tectonic units determines the formation of the metallogenic belt. Since the discovery of the earliest Carlin type gold deposits (micro-disseminated gold deposits) in southwest Guizhou in the 1970s, more than 50 gold deposits have been discovered in this area. Up to now, more than 500 tons of gold resources have been proved. From the geological, tectonic, geophysical, geochemical and remote sensing geological features of the area, there is still potential for prospecting for large gold resources in this area. The ore deposit geological characteristics, ore-controlling conditions, geochemical characteristics, gold occurrence forms and ore dressing tests, ore genesis of Yata gold deposit have been studied by predecessors, but the study on ore-forming fluid of Yata gold deposit is not perfect. The ore-forming fluid is closely related to the genesis of the deposit. Therefore, in this paper, the fluid inclusions of Yata gold deposit are taken as the object of study. By testing, calculating and analyzing the experimental data of inclusions, we can further judge the metallogenic hydrothermal types and the genetic types of Yata gold deposits. Based on the field geological investigation of Yata gold deposit, the metallogenic geological background and geological characteristics of the deposit are further understood in this paper. In this paper, from the micro aspect, the microlithofacies observation and study are carried out on the thin sections of the inclusions, the homogeneous method is used to measure the temperature, the homogeneous temperature and the freezing point temperature of the fluid in the inclusion are obtained, and the salinity of the fluid is further obtained by calculating the salinity of the fluid. The related parameters such as density and pressure, combined with the previous research data, discussed the ore-forming fluid properties, fluid source, fluid migration and gold precipitation mechanism of the Yata gold deposit. Then the genetic type of the Yata gold deposit is judged. The main conclusions of this paper are as follows: there are three types of inclusions in Yata gold deposit, mainly gas-liquid two-phase inclusions, secondary pure liquid inclusions, three-phase inclusions are the least, the shape of inclusions is irregular and subellipsoidal, The inclusions are mainly ellipsoidal and negative. The size of inclusions is generally 3 ~ 20 渭 m, and the pure liquid inclusions are mostly small inclusions which are difficult to observe. In this paper, the data of gas-liquid two-phase inclusions are tested, and the homogenization temperature of inclusions is 101.7 ~ 293.3 鈩，

本文編號：1831358