本文選題：礦床地質(zhì)特征 + 礦床地球化學(xué)��； 參考：《昆明理工大學(xué)》2016年碩士論文

【摘要】：滇中前震旦系主要位于揚(yáng)子地塊西南緣,元謀—綠汁江斷裂以東、普渡河—滇池?cái)嗔岩晕?巖漿活動(dòng)強(qiáng)烈導(dǎo)致該區(qū)地殼結(jié)構(gòu)復(fù)雜,具有“多層結(jié)構(gòu)”的特點(diǎn)。據(jù)統(tǒng)計(jì)賦存在昆陽(yáng)群中的鉛鋅礦床(點(diǎn))有近二十余處,其賦礦地層主要為：大龍口組(Pt2d)、黑山頭組(Pt2hst)、鵝頭廠組(Pt2e)。本次研究工作在導(dǎo)師的指導(dǎo)下選定賦存于昆陽(yáng)群中的典型礦床：大笑、熱水塘鉛鋅礦床,深入實(shí)地進(jìn)行了嚴(yán)謹(jǐn)?shù)囊巴獾刭|(zhì)調(diào)查工作,通過(guò)典型礦床的成礦地質(zhì)背景、礦床地質(zhì)特征、流體包裹體特征、同位素地球化學(xué)、同位素年代學(xué)等方面的研究,并結(jié)合前人地質(zhì)資料以及本次所測(cè)數(shù)據(jù),總結(jié)出滇中前震旦紀(jì)鉛鋅成礦域內(nèi)鉛鋅礦床(點(diǎn))的空間分布、賦礦層位、賦礦巖性、成礦物質(zhì)來(lái)源和成礦年代。本論文取得了以下主要結(jié)論：1.滇中前震旦紀(jì)地質(zhì)構(gòu)造、巖漿活動(dòng)較為活躍,變質(zhì)作用十分復(fù)雜,礦區(qū)鉛鋅礦體主要賦存在黑山頭組(Pt2hst)、鵝頭廠組(Pt2e)碳酸鹽巖中,所選典型礦床礦體均呈現(xiàn)出似層狀、脈狀、透鏡狀產(chǎn)出的特點(diǎn)。2.所采集礦石中的礦物組分較簡(jiǎn)單,主要礦物為方鉛礦、閃鋅礦、黃鐵礦、黃銅礦,次生礦物有：褐鐵礦、鉛礬、白鉛礦等。經(jīng)鑒定礦區(qū)內(nèi)礦石的結(jié)構(gòu)以自形、半自形、他形粒狀結(jié)構(gòu),溶蝕殘余結(jié)構(gòu),交代殘余交叉結(jié)構(gòu),乳濁狀結(jié)構(gòu)為主；局部可見(jiàn)葉片狀結(jié)構(gòu),變晶結(jié)構(gòu),壓碎結(jié)構(gòu),填隙結(jié)構(gòu),固溶體分解結(jié)構(gòu)；網(wǎng)狀結(jié)構(gòu)；偶見(jiàn)揉皺結(jié)構(gòu),膠結(jié)狀結(jié)構(gòu),交代殘余結(jié)構(gòu),嵌晶結(jié)構(gòu)-交代溶蝕結(jié)構(gòu),包含結(jié)構(gòu)。3.圍巖蝕變主要以硅化、黃鐵礦化和碳酸鹽化為主,局部可見(jiàn)重晶石化和白云石化。4.大笑鉛鋅礦床與熱水塘鉛鋅礦床硫、鉛同位素均表現(xiàn)出多來(lái)源的特征：大笑礦石鉛來(lái)源于地幔與造山帶、熱水塘礦石鉛來(lái)源于上地殼與造山帶,結(jié)合單礦物鍶、釹同位素的研究表明,大笑、熱水塘鉛鋅礦床成礦物質(zhì)可能主要源自賦礦圍巖的碳酸鹽巖中或基底地層之中,而且有數(shù)據(jù)表明有深部的流體參與成礦。其所選典型礦床成礦年代大致相當(dāng)于印支晚期—燕山早期之間。5.流體包裹體地球化學(xué)特征則表現(xiàn)出所選滇中前震旦紀(jì)鉛鋅礦床成礦流體為：中—低溫、低鹽度、中—低密度、地表淺層的特點(diǎn)。6.滇中地區(qū)鉛鋅礦床具有多期次、成礦物質(zhì)多來(lái)源的特點(diǎn),在印支期構(gòu)造活動(dòng)強(qiáng)烈作用下,使深部巖漿上侵,巖漿熱液沿早期構(gòu)造形成的裂隙運(yùn)移,并對(duì)地層內(nèi)的成礦物質(zhì)進(jìn)行萃取,在有利部位聚集成礦。
[Abstract]:The preSinian system in central Yunnan is mainly located in the southwestern margin of Yangtze block, east of Yuanmou-Luzhujiang fault and west of Puduhe-Dianchi fault. Magmatic activity strongly causes the crustal structure in this area to be complicated and has the characteristics of "multi-layer structure". According to statistics, there are more than 20 Pb-Zn deposits (points) in Kunyang Group. The main ore-bearing strata are: Pt2dPt2DU in Dalong mouth formation, Pt2hsti in Heshantou formation and Pt2etein in Yetouchang formation. Under the guidance of my tutor, this study selected typical deposits in Kunyang group: laughter, hot water pond lead-zinc deposit, and carried out rigorous field geological survey in the field, through the metallogenic geological background of typical deposits. Geological characteristics of ore deposits, characteristics of fluid inclusions, isotopic geochemistry, isotopic chronology and so on. The spatial distribution, ore-bearing horizon, ore-bearing rock, ore-forming material source and metallogenic age of lead-zinc deposits in the Precinian lead-zinc metallogenic region in central Yunnan are summarized. In this paper, the main conclusions are as follows: 1. The Precinian geological structure of central Yunnan is characterized by active magmatic activity and complex metamorphism. The lead-zinc orebodies in the mining area are mainly located in the carbonate rocks of the Keshantou formation (Pt2hsthe) and the Yetouchang formation (Pt2e). The orebodies of the selected typical deposits are laminar and vein-like. Characteristics of lenticular production. The main minerals are galena sphalerite pyrite chalcopyrite and secondary minerals such as limonite lead alum and white lead ore. The ore structures in the mining area are identified as self-shape, semi-automorphism, heteromorphic granular structure, dissolved residual structure, metasomatic residual cross structure, opacifying structure, locally visible vane structure, metamorphic structure, crushing structure, filling structure, etc. Solid solution decomposition structure; network structure; occasional crinkle structure, cemented structure, metasomatic residual structure, embedded crystal structure-metasomatic solution structure, including structure. 3. The main alteration of surrounding rock is silicification, pyrite and carbonization, barite and dolomitization. 4. The sulfur and lead isotopes of the Kuai lead-zinc deposit and the Yuantang lead-zinc deposit both show the characteristics of multiple sources: lead from the mantle and orogenic belt, and lead from the upper crust and orogenic belt from the Huantang ore, combined with strontium, a single mineral. The study of neodymium isotopes shows that the ore-forming material of the Yuantang lead-zinc deposit may originate mainly from carbonate rocks or basement strata of ore-bearing surrounding rock, and there are some data indicating that deep fluids are involved in mineralization. The metallogenic age of the typical deposit is approximately equal to that of the late Indosinian to the early Yanshanian. The geochemical characteristics of fluid inclusions show that the ore-forming fluids of the Precinian lead-zinc deposits in central Yunnan are: moderate-low temperature, low salinity, medium-low density, and shallow surface features .6. The Pb-Zn deposits in central Yunnan are characterized by multiple stages and multiple sources of ore-forming materials. Under the strong action of Indosinian tectonic activities, the deep magma is invaded and magmatic hydrothermal fluid migrates along the cracks formed by the early tectonics. The ore-forming materials in the strata are extracted and formed in favorable areas.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類(lèi)號(hào)】：P618.4

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