本文選題：西藏 + 岡底斯成礦帶��； 參考：《成都理工大學》2017年碩士論文

【摘要】：西藏岡底斯成礦帶是我國三大重要斑巖成礦帶之一,甲瑪銅多金屬礦床是西藏岡底斯中段東部的超大型斑巖-矽卡巖礦床,探明矽卡巖型礦體銅鉬鉛鋅金銀均達大型以上規(guī)模,具有重要的經(jīng)濟意義和研究意義。前人對礦床的研究已取得大量成果,現(xiàn)已查明區(qū)域地質背景、礦床地質特征、成礦元素分帶特征、矽卡巖礦物蝕變與分帶、成巖成礦年代學、流體演化等,并提出了“四位一體”礦床成礦模式與勘查模型。然而甲瑪?shù)V床還有一些問題尚未得到解決,例如銅山-南坑地區(qū)由于構造復雜,歷來少有此區(qū)域研究資料,前人尚未對銅山南坑地區(qū)銅富礦體及其與侵入巖體的關系進行深入系統(tǒng)地研究。故本文在充分收集礦區(qū)資料的基礎上系統(tǒng)總結甲瑪斑巖成礦系統(tǒng)特征,全面、系統(tǒng)地研究和分析銅山南坑銅富礦體特征及其與侵入巖體的關系,以期查明銅富礦體控礦機制。岡底斯成礦帶目前已發(fā)現(xiàn)并評價包括甲瑪-驅龍-邦浦礦集區(qū)的5個重要礦集區(qū)。前人建立的甲瑪“四位一體”成礦模式產(chǎn)于斑巖中的銅鉬礦體、角巖中的銅鉬(金銀)礦體、矽卡巖中的銅多金屬礦體以及外圍的獨立金礦體。礦區(qū)地層主要出露形成于中生代的上侏羅統(tǒng)多底溝組(J3d)、下白堊統(tǒng)林布宗組(K1l)與第四系沉積物。區(qū)內(nèi)主要構造線為北西西向,發(fā)育復式褶皺體系,其中尤以銅山滑覆構造和甲瑪-卡軍果推覆構造系最為重要。巖漿巖主要由6期基-中酸性侵入巖體構成�；诘V床最新的勘查資料和研究成果,根據(jù)礦區(qū)工業(yè)推薦指標Cu1%圈定銅富礦體,系統(tǒng)地統(tǒng)計分析了富銅礦體在平面和剖面上的分布特征和產(chǎn)出狀態(tài)。探礦工程研究表明礦區(qū)存在3個銅富礦體濃集中心:由19-23-27線剖面控制的北西部牛馬塘地區(qū)、由主要由0-4-8-12-16線剖面控制的中部隱伏斑巖體接觸帶附近與由38-52-54-58線剖面控制的銅山南坑地區(qū)。富礦體礦石礦物主要為組合斑銅礦+黃銅礦+黝銅礦±方鉛礦+閃鋅礦,脈石礦物以矽卡巖礦物為主。與富銅礦石有關的蝕變主要為硅化、碳酸鹽化以及矽卡巖的退化蝕變。電子探針分析表明斑巖接觸帶附近銅富礦體與銅山南坑銅富礦體相比,含銅礦物Fe、Ag含量更高,Cu、Co值較低。經(jīng)充分分析研究表明甲瑪?shù)V區(qū)銅富礦體控礦因素主要分為:斑巖接觸帶控礦、背斜控礦和滑覆體控礦。與世界上其他manto型礦床(體)對比研究,認為銅山滑覆體內(nèi)的富礦體為斑巖成礦系統(tǒng)外圍的manto型礦體。深部隱伏斑巖體接觸帶、銅山南坑Manto型礦體南西向外圍、碳酸鹽地層中褶皺核是甲瑪?shù)V床富礦體下一步找礦的關鍵部位。
[Abstract]:The Gangdis metallogenic belt in Tibet is one of the three important porphyry metallogenic belts in China. The Jiama copper polymetallic deposit is a very large porphyry skarn deposit in the eastern part of Gangdis, Tibet. The copper, molybdenum, lead, zinc, gold and silver ore bodies of the skarn type have all reached a large scale. Has the important economic significance and the research significance. A great deal of achievements have been made in the study of ore deposits by predecessors. The regional geological background, the geological characteristics of ore deposits, the zoning characteristics of metallogenic elements, the alteration and zoning of skarn minerals, the diagenesis and metallogenic chronology, the fluid evolution, etc., have been identified. The metallogenic model and exploration model of the "four-in-one" deposit are put forward. However, there are still some unsolved problems in the Jiama deposit. For example, the Tongshan-Nankeng area, because of its complicated structure, has always been a rare regional research material. The relationship between copper rich orebody and intrusive rock mass in Nankeng area of Tongshan has not been studied systematically. Therefore, this paper systematically summarizes the ore-forming system characteristics of Jiama porphyry on the basis of fully collecting the data of mining area, studies and analyzes systematically the ore-rich orebody characteristics of Tongshan Nankeng copper orebody and its relation with intrusive rock mass, in order to find out the ore-controlling mechanism of copper ore-rich ore body. The Gangdis metallogenic belt has found and evaluated five important ore accumulation areas including the Jiama-Dulong-Bangpu ore accumulation area. The "four-in-one" metallogenic model of Jiama was established in the copper-molybdenum ore body in porphyry, the copper-molybdenum (gold-silver) orebody in hornstone, the copper-polymetallic ore body in skarn and the independent gold ore body in the periphery. The strata of the mining area are mainly exposed from the upper Jurassic Dodegou formation of the Upper Jurassic and the Lower Cretaceous Linbuzong formation K1l) and the Quaternary sediments. The main tectonic lines in the area are NW trending, and the complex fold system is developed, especially the Tongshan slip structure and the Jiarma-Kagunguo nappe system. Magmatic rock is mainly composed of 6-stage-intermediate-acid intrusive rock mass. Based on the latest exploration data and research results, the distribution characteristics and occurrence state of copper rich ore bodies in plane and profile are analyzed systematically according to the industrial recommendation index Cu 1% for delineating copper rich ore bodies. Prospecting engineering research shows that there are three concentration centers of copper rich ore bodies in the mining area: Niumatang area in the north and west, controlled by the section of the 19-23-27 line. Near the contact zone of the central occult rock mass controlled by the section of line 0-4-8-8-12-16 and the Nankeng area of Tongshan by the section of line 38-52-54-58. The ore-rich ore minerals are mainly composed of chalcopyrite, chalcopyrite and sphalerite, and skarn minerals are the main gangue minerals. The alteration related to copper-rich ore is mainly silicification, carbonization and degenerative alteration of skarn. The electron probe analysis shows that the copper-rich ore body near the porphyry contact zone is lower than the copper rich orebody in Tongshan Nankeng. The results show that the ore-controlling factors of copper rich ore body in Jiama mine are mainly divided into porphyry contact zone ore-controlling anticline ore-controlling and sliding ore-controlling. Compared with other manto type deposits in the world, it is considered that the ore-rich body in Tongshan slip body is manto type orebody outside porphyry metallogenic system. The deep concealed porphyry contact zone, the south west periphery of the Manto type orebody in Tongshan Nankeng, and the fold core in carbonate formation are the key points for the next prospecting of the ore-rich body in Jiama deposit.
【學位授予單位】：成都理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：P618.2

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