本文關(guān)鍵詞： 礦床地質(zhì)特征 地球化學(xué) 礦床成因 建水蘇租-暮陽　出處：《昆明理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：云南建水蘇租-暮陽鉛鋅礦區(qū)位于康滇地軸南段東緣"建水-盤溪古隆起"構(gòu)造帶上。東臨小江斷裂,南臨彌勒-師宗斷裂,總體構(gòu)造線為北北東向。區(qū)內(nèi)現(xiàn)已發(fā)現(xiàn)10余處鉛鋅礦床(點(diǎn))構(gòu)成北東向的礦帶。百里背斜貫穿全境,其中蘇租-暮陽鉛鋅礦床分別位于百里背斜的兩翼。區(qū)內(nèi)地層總體走向北北東,表現(xiàn)為傾向南東的單斜構(gòu)造。該成礦帶的鉛鋅礦床集中產(chǎn)于中泥盆曲靖組的白云巖上。本文選取蘇租-暮陽鉛鋅礦床為研究對象,主要通過礦床地質(zhì)特征、流體包裹體、元素地球化學(xué)、同位素地球化學(xué)特征等方面研究,同時(shí)結(jié)合已有資料進(jìn)行成礦分析,旨在為蘇租-暮陽鉛鋅礦床的成因提供地球化學(xué)方面的依據(jù),本論文取得以下方面的成果和認(rèn)識(shí):1.研究區(qū)鉛鋅礦床主要賦存于中泥盆系曲靖組碳酸鹽巖中。巖性以中至厚層狀白云巖、灰?guī)r、含生物礁灰?guī)r為主,礦體整體呈層狀、似層狀產(chǎn)出。礦體的產(chǎn)出受構(gòu)造和地層控制。2.礦石礦物組成原生金屬硫化礦物主要為方鉛礦和閃鋅礦,次為黃鐵礦及少量黃銅礦、輝銀礦;非金屬礦物主要為白云石、方解石,其次為石英。圍巖蝕變以碳酸鹽化為主。礦石主要結(jié)構(gòu)為細(xì)晶結(jié)構(gòu)、交代溶蝕結(jié)構(gòu)、交代殘留結(jié)構(gòu)、他形粒狀結(jié)構(gòu)。礦石主要構(gòu)造為團(tuán)塊狀構(gòu)造、網(wǎng)脈狀構(gòu)造、星散浸染狀構(gòu)造、斑點(diǎn)狀構(gòu)造。3.流體包裹體地球化學(xué)特征變現(xiàn)出蘇租-暮陽鉛鋅礦床的成礦流體為:中-低溫、低鹽度、低密度的NaCl-H2O體系,地殼淺部環(huán)境成礦。4.蘇租暮陽鉛鋅礦床硫、鉛同位素均表現(xiàn)出多來源特征:硫的主要來自來自賦礦圍巖和各時(shí)代的碳酸鹽巖;鉛同位素來源于下地殼和造山帶,且鉛源參數(shù)特征更接近于造山帶,同時(shí)混合了一定的深部物質(zhì),鉛同位素組成反映出礦床的成礦金屬是多來源的。蘇租-暮陽鉛鋅礦床成礦流體中C-O同位素來自海相碳酸鹽巖經(jīng)溶解作用,在成礦過程中碳酸鹽巖作為金屬元素的載體發(fā)生了溶解-運(yùn)移-再沉積作用。結(jié)合單礦物鍶同位素研究表明,蘇租-暮陽鉛鋅礦床成礦物質(zhì)多來源混合,主要來自各時(shí)代沉積的碳酸鹽巖和流經(jīng)基底巖石。所選礦床的成礦年代大致相當(dāng)于晚印支期-早燕山期之間。5.根據(jù)蘇租-暮陽鉛鋅礦床的地質(zhì)特征、鏡下礦物結(jié)構(gòu)構(gòu)造特征,將該區(qū)成礦期次可以劃分三個(gè)層次即沉積成巖期,熱液成礦期和表生氧化期。再結(jié)合礦床地球化學(xué)特征、流體包裹體特征初步厘定蘇租-暮陽鉛鋅礦床為沉積-混合熱液型鉛鋅礦床。
[Abstract]:Suzhu-Wuyang lead-zinc mine area in Jianshui, Yunnan Province is located in the "Jianshui-Panxi paleouplift" tectonic belt in the eastern margin of the southern section of the Kangdian axis. It is bounded by the Xiaojiang fault to the east and the Maitree-Shizong fault to the south. The overall tectonic line is NNE. More than 10 Pb-Zn deposits (points) have been found in the area to form a NE-trending ore belt. The hundred li anticline runs through the whole area. The Suzhuo-Wuyang Pb-Zn deposit is located on the two flanks of the hundred Li anticline respectively. The lead-zinc deposit in the metallogenic belt is concentrated on dolomite in the Qujing formation of the middle Devonian. The Suzhuang-Wuyang Pb-Zn deposit is selected as the research object in this paper, mainly through the geological characteristics of the deposit, fluid inclusions, Element geochemistry, isotopic geochemical characteristics and metallogenic analysis are carried out in combination with the available data in order to provide geochemical basis for the genesis of the Suzhuang-Wuyang lead-zinc deposit. This paper has obtained the following achievements and understandings: 1. The lead-zinc deposits in the study area are mainly located in carbonate rocks of the Qujing formation of the Middle Devonian system. The lithology of the deposits is meso-thick layered dolomite, limestone, reef bearing limestone, and the whole orebody is stratiform. The ore body is controlled by structure and strata. The ore minerals consist of galena and sphalerite, followed by pyrite and a small amount of chalcopyrite, and the nonmetallic minerals are dolomite and calcite. The main structure of the ore is fine crystal structure, metasomatic solution structure, metasomatic residual structure, heteromorphic granular structure. The geochemical characteristics of fluid inclusions show that the ore-forming fluids of Suzhuang-Wuyang lead-zinc deposit are NaCl-H2O systems of medium-low temperature, low salinity and low density. The sulfur and lead isotopes of the Suzhuangyang lead-zinc deposit are characterized by multiple sources: sulfur mainly comes from host rocks and carbonate rocks of various ages, and lead isotopes are derived from the lower crust and orogenic belts, and lead isotopes are derived from the lower crust and orogenic belts. The characteristics of lead source parameters are closer to the orogenic belt, and some deep materials are mixed. The isotopic composition of lead reflects that the metallogenic metals of the deposit are multi-source. C-O isotopes in the ore-forming fluids of Suzhuang-Wuyang Pb-Zn deposit are derived from the dissolution of marine carbonate rocks. During the process of mineralization, carbonate rocks as the carrier of metal elements have dissolution-migration-redeposition process. Combined with strontium isotope study of single mineral, it is shown that the ore-forming materials of Suzhuang-Wuyang lead-zinc deposit are mixed from multiple sources. The ore-forming age of the selected deposit is approximately equal to that of the late Indosinian and early Yanshanian epoch .5.According to the geological characteristics of the Suzhuang-Wuyang lead-zinc deposit, the structural characteristics of minerals are obtained under microscope. The metallogenic stages in this area can be divided into three levels: sedimentary diagenesis, hydrothermal mineralization and supergene oxidation. The characteristics of fluid inclusions indicate that the Suzhuang-Wuyang Pb-Zn deposit is a sedimentary-mixed hydrothermal Pb-Zn deposit.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P618.4

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