本文選題：大渡河 + 地質(zhì)特征�。� 參考：《成都理工大學(xué)》2015年碩士論文

【摘要】：大渡河流域金成礦帶是我國西南地區(qū)發(fā)現(xiàn)的一條重要的金成礦集中區(qū)。礦區(qū)位于揚(yáng)子地臺(tái)西緣康滇地軸北端,龍門山褶皺帶和巴顏喀拉造山帶相接處。已發(fā)現(xiàn)多處巖金礦床,構(gòu)成了著名的康定大渡河“金谷”。大渡河金成礦帶處于多組大斷裂交匯部位,自震旦紀(jì)以來直至當(dāng)今地質(zhì)構(gòu)造活動(dòng)依然活躍。經(jīng)歷多階段多期次的巖漿活動(dòng),構(gòu)造運(yùn)動(dòng),成礦條件十分優(yōu)越,找礦潛力巨大。黃金坪金礦床地處大渡河流域金成礦帶中段,為區(qū)內(nèi)產(chǎn)于基底中的典型金礦床。區(qū)內(nèi)巖漿活動(dòng)頻繁,皺褶、斷裂十分發(fā)育。該礦床發(fā)現(xiàn)較早(1983年),并一直都在開采中。但因?yàn)槭軞夂�、地理位置等自然條件限制,近年來較少有專家學(xué)者對(duì)該礦床的成礦地質(zhì)背景,成礦條件、成礦物質(zhì)來源及礦床地球化學(xué)特征研究。因此本人結(jié)合礦物巖石學(xué)、地球化學(xué)等相關(guān)專業(yè)知識(shí),在前人已總結(jié)的成果基礎(chǔ)之上,較系統(tǒng)地研究了礦床的地質(zhì)地球化學(xué)特征,探討了成礦物質(zhì)的來源及其成礦條件。黃金坪金礦床成礦流體在早期受擠壓后期拉張貫入斷裂或者裂隙中,屬典型的石英脈型金礦床。含金石英脈在空間上與輝綠巖巖脈密切相伴,并捕獲了大量輝綠巖或者硅質(zhì)巖,時(shí)而捕獲,時(shí)而相互平行。金屬礦物主要為黃鐵礦,毒砂、方鉛礦、閃鋅礦,含有少量磁鐵礦。結(jié)合野外地質(zhì)觀察及室內(nèi)鑒定對(duì)黃金坪石英閃長巖挑選鋯石U-Pb測(cè)年,獲得成巖年齡723Ma左右,與金成礦年齡相差甚遠(yuǎn)。含金石英脈ESR測(cè)得的年齡分別為50.5±5.0Ma、16.7±1.6Ma、4.9±0.4Ma。其中16.7±1.6Ma的含金石英脈為主要含金石英脈,石英閃長巖與金成礦年齡相差甚遠(yuǎn)。結(jié)合野外地質(zhì)觀察及室內(nèi)鑒定,對(duì)黃金坪金礦床的巖石學(xué)特征、常量元素地球化學(xué)特征、稀土元素和微量元素地球化學(xué)特征、同位素地球化學(xué)特征進(jìn)行的研究表明,金成礦形成于造山環(huán)境。石英流體包裹體表明礦床成礦流體溫度屬于中低溫,黃鐵礦S同位素分析獲得成礦流體中的S來自地幔。
[Abstract]:The Dadu River Basin gold metallogenic belt is an important gold mineralization concentration area discovered in southwest China. The mining area is located at the northern end of the Kangdian axis on the western margin of the Yangtze platform, where the Longmenshan fold belt meets the Bayan Kara orogenic belt. A number of rock gold deposits have been discovered, forming the famous "Golden Valley" of the Dadu River in Kangding. The Daduhe gold metallogenic belt is located at the intersection of many large faults and has been active in geological tectonics since the Sinian. It has experienced multi-stage and multi-stage magmatism, tectonic movement, excellent metallogenic conditions and great prospecting potential. The Jinping gold deposit is located in the middle section of the gold metallogenic belt in the Dadu River basin and is a typical gold deposit occurring in the basement. Magmatic activity in the area is frequent, folds and faults are well developed. The deposit was discovered earlier (1983) and has been under exploitation. However, due to the limitation of climate, geographical location and other natural conditions, few experts and scholars have studied the metallogenic geological background, metallogenic conditions, ore-forming source and geochemical characteristics of the deposit in recent years. Therefore, based on the related knowledge of mineral petrology and geochemistry, and on the basis of the previous achievements, I have systematically studied the geological and geochemical characteristics of the deposit, and discussed the source of the ore-forming material and its metallogenic conditions. The ore-forming fluid of the Jinping gold deposit is a typical quartz vein type gold deposit. The auriferous quartz vein is closely associated with the diabase vein in space and captures a large number of diabase or siliceous rocks which are sometimes captured and sometimes parallel to each other. Metal minerals are mainly pyrite, arsenopyrite, galena, sphalerite, containing a small amount of magnetite. Combined with field geological observation and laboratory identification, the U-Pb dating of zircon selected from Jinping quartz diorite shows that the diagenetic age is about 723Ma, which is far from gold mineralization age. The age of gold-bearing quartz vein determined by ESR is 50.5 鹵5.0 Ma, 16.7 鹵1.6 Ma, 4.9 鹵0.4 Ma, respectively. Among them, 16.7 鹵1.6Ma gold-bearing quartz vein is the main gold-bearing quartz vein, and the age of quartz diorite and gold mineralization is very different. Combined with field geological observation and laboratory identification, the petrological characteristics, geochemical characteristics of major elements, geochemical characteristics of rare earth elements and trace elements, and isotopic geochemical characteristics of the Jinping gold deposit are studied. Gold mineralization was formed in orogenic environment. The quartz fluid inclusions indicate that the ore-forming fluid temperature of the deposit belongs to the middle and low temperature, and the S of the ore-forming fluid derived from the mantle is obtained by S isotope analysis of pyrite.
【學(xué)位授予單位】：成都理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：P618.51

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本文編號(hào)：1964184