發(fā)布時(shí)間：2018-05-04 02:08

  本文選題：流體包裹體 + 成礦過程　； 參考：《長安大學(xué)》2017年碩士論文

【摘要】：湘西李梅鉛鋅礦位于上揚(yáng)子地塊與江南地塊間過渡地帶的武陵山弱變形帶上,是湘西-鄂西鉛鋅成礦帶北部的花垣礦集區(qū)中一個(gè)十分重要的MVT型鉛鋅礦床。礦區(qū)主要出露中、上寒武統(tǒng)婁山關(guān)組(?2-3l)、中寒武統(tǒng)高臺(tái)組(?2g)和下寒武統(tǒng)清虛洞組(?1q)地層,鉛鋅礦產(chǎn)于寒武統(tǒng)清虛洞組灰?guī)r層中,受構(gòu)造巖相控制特征明顯。選擇《湘西李梅鉛鋅礦床流體特征及其成礦過程分析》作為學(xué)位論文題目,具有重要的地質(zhì)科學(xué)研究意義和地質(zhì)找礦參考價(jià)值。依托《湘西張家界花垣整裝勘查區(qū)礦田地質(zhì)研究和找礦》項(xiàng)目,在野外地質(zhì)勘察和構(gòu)造測(cè)量的基礎(chǔ)上,系統(tǒng)的開展室內(nèi)鏡下鑒定和測(cè)試分析綜合研究,以礦區(qū)構(gòu)造和巖石特征為主要研究目標(biāo),按時(shí)提交了研究課題報(bào)告和學(xué)位論文。研究主要取得如下進(jìn)展:1.將李梅鉛鋅礦成礦過程劃分為四個(gè)階段:根據(jù)野外觀察到的不同類型礦化穿插關(guān)系和分布特征、顯微鏡下詳細(xì)的礦石結(jié)構(gòu)構(gòu)造、礦物結(jié)晶狀態(tài)和組合特征,將該礦床的成礦過程劃分為以下四個(gè)階段。閃鋅礦沿縫合線晶出階段:該階段形成的礦石主要為稀疏浸染狀礦石,形成于早期階段。閃鋅礦-方鉛礦沿裂隙、孔隙交代充填階段:該階段成礦作用較強(qiáng),成礦物質(zhì)集中。金屬礦物主要為閃鋅礦,其次為方鉛礦和黃鐵礦。脈石礦物主要為方解石,次為重晶石、螢石等。該階段形成的礦石主要為網(wǎng)脈狀、斑脈狀礦石,形成于主要成礦階段。方鉛礦-方解石充填階段:該成礦階段礦物組合簡(jiǎn)單,金屬礦物只有方鉛礦和少量閃鋅礦,脈石礦物僅見方解石。熱液方解石脈沿裂隙侵入階段:該階段為后期熱液方解石脈侵入到裂隙、孔隙等中結(jié)晶。對(duì)成礦起到破壞的作用。2.完成了李梅成礦階段流體特征的分析:本次所采樣品中都有一定數(shù)量流體包裹體發(fā)育,主要為氣液兩相共存的包裹體。閃鋅礦-方鉛礦沿裂隙、孔隙交代充填階段,氣液兩相包裹體鹽度介于1.1%-23.1%Na Cleqv.,均一溫度介于78-342℃,成礦流體流體的密度為0.70-1.14g/cm3,成礦壓力介于194.30-960.19bar。方鉛礦-方解石充填階段,氣液兩相包裹體鹽度介于1.4%-23.1%Na Cleqv.,均一溫度介于68-259℃,成礦流體流體的密度為0.88-1.15g/cm3,成礦壓力介于190.99-727.13bar。熱液方解石脈沿裂隙侵入階段,氣液兩相包裹體鹽度介于3.71%-23.18%Na Cleqv.,均一溫度介于76-227℃,成礦流體流體的密度為0.91-1.12g/cm3,成礦壓力介于199.46-637.29bar。包裹體研究表明,李梅礦床成礦過程中流體包裹體均一溫度有所降低,鹽度均值變化較弱,其鹽度峰值均出現(xiàn)在21.0%-23.0%區(qū)間。3.指出了李梅MVT型鉛鋅礦區(qū)沉積環(huán)境特征:以李梅鉛鋅礦區(qū)外圍清虛洞組和高臺(tái)組不同層位的碳酸鹽巖為研究對(duì)象,主要采用巖石主量、微量元素地球化學(xué)分析,得出了李梅鉛鋅礦區(qū)清虛洞期到高臺(tái)期碳酸鹽巖沉積特征表現(xiàn)為海水逐漸退去的趨勢(shì)。在清虛洞期-高臺(tái)期研究區(qū)碳酸鹽巖沉積受陸源碎屑和成巖作用影響有限,古海洋環(huán)境為氧化環(huán)境、古海水為暖水環(huán)境、古氣候由潮濕向干旱轉(zhuǎn)換的變化,也正是由于這樣的海水環(huán)境導(dǎo)致了大量藻類生物的繁殖,從而沉積形成藻灰?guī)r,成為主要賦礦巖石。4.編制了花垣礦田礦體等高線圖,分析了李梅鉛鋅礦床成礦過程:以巖心鉆孔數(shù)據(jù)為依據(jù)制圖,深化了深部礦床的展布特征及構(gòu)造演化成礦的認(rèn)識(shí)。李梅MVT型鉛鋅礦床容礦圍巖以藻灰?guī)r為主,產(chǎn)在雪峰期-加里東期構(gòu)造運(yùn)動(dòng)形成的北東-北北東向平緩褶皺、斷裂構(gòu)造帶中。含礦熱液從下伏地層在熱力大的驅(qū)動(dòng)下,沿?cái)嗔褞�向上運(yùn)移,在含有裂縫、孔隙的藻灰?guī)r中反生還原反應(yīng),置換出鉛鋅等元素,使其富集成礦。礦床具有明顯后生特征。
[Abstract]:Xiangxi Li Mei lead zinc mine is located in the weak deformation zone of the Wuling Mountain in the transition zone between the upper Yangtze block and the Jiangnan massif. It is a very important MVT type lead-zinc deposit in the Huayuan ore collection area in the northern part of the Xiangxi - Western Hubei lead zinc metallogenic belt. The mining area is mainly exposed, the upper Cambrian Lou Shan Guan formation (? 2-3l), the Middle Cambrian Gao Tai formation (? 2G) and the lower Cambrian deficiency In the formation (? 1q) formation, the lead and zinc minerals are in the limestone strata of the Qingxu formation in the Cambrian system and are controlled by the tectonic lithofacies. The selection of the fluid characteristics and the metallogenic process analysis of the Xiangxi Li Mei lead-zinc deposit, as the title of the dissertation, has important geological scientific research significance and geological prospecting reference value. Relying on the Huayuan rectification exploration in Zhangjiajie, Xiangxi On the basis of field geological survey and structural survey, the comprehensive research on identification and test analysis in the field is carried out on the basis of field geological survey and structural survey. The main research targets are the structure and rock characteristics of the mining area. The research project report and the dissertation are submitted on time. The main achievements are as follows: 1. Li Meiqian The mineralization process of zinc deposits is divided into four stages: according to the different types of mineralization and distribution characteristics observed in the field, the detailed ore structure structure, mineral crystallization state and combination characteristics under the microscope, the mineralization process of the deposit is divided into the following four stages. It is mainly sparse and disseminated ore, formed in the early stage. The sphalerite galena along the fissure and pore metasomatism filling stage: the mineralization is strong and the metallogenic material is concentrated. The metal minerals are mainly sphalerite, followed by galena and pyrite. The gangue minerals are mainly calcite, second is barite, fluorite and so on. Ore formed in this stage. The main metallogenic phase, speckled ore, formed in the main metallogenic stage. The galena calcite filling stage: the mineral assemblage of the metallogenic stage is simple, the metal minerals are only galena and a small amount of sphalerite, and the gangue minerals are only calcite. .2. has completed the analysis of the fluid characteristics of the Li Meicheng ore stage: the fluid inclusions in a certain number of samples were developed in this sample, mainly as inclusions of gas-liquid two phases. Sphalerite galena along fissures, pore metasomatism and filling stage, and the salinity of gas-liquid inclusions in 1.1%-23.1%Na Cleqv., the homogenization temperature is 78-342 C, the density of fluid fluid is 0.70-1.14g/cm3, and the metallogenic pressure is between 194.30-960.19bar. galena and calcite filling stage. The salinity of the gas-liquid inclusions is between 1.4%-23.1%Na Cleqv., the homogeneous temperature is at 68-259, the density of the fluid body of the ore-forming fluid is 0.88-1.15g/cm3, and the metallogenic pressure is in 190.99-7. The 27.13bar. hydrothermal calcite veins are in the stage of fracture invasion. The salinity of the gas-liquid inclusions is between 3.71%-23.18%Na Cleqv., the homogeneous temperature is between 76-227 and 0.91-1.12g/cm3, and the density of the fluid fluid is 0.91-1.12g/cm3. The metallogenic pressure is in the 199.46-637.29bar. inclusions study. The homogeneous temperature of fluid inclusions in the Li Meikuang bed mineralization process has been reduced. The change of the average salinity is weak, and the peak salinity of its salinity is in the 21.0%-23.0% interval.3. points out the sedimentary environment characteristics of the Li Mei MVT type lead zinc mine area: the carbonate rocks in the Qingxu hole group and the high platform group in the periphery of the Li Mei lead-zinc mining area are the research objects, and the major rock mass and trace element geochemical analysis are mainly used to obtain the Li Mei lead and zinc. The sedimentary characteristics of carbonate rocks in the Qingxu hole period and the high stage of the mining area show the trend of the gradual retreat of the sea water. In the Qingxu cave period - high stage, the carbonate deposits are limited by the terrigenous clastic and diagenesis, the paleoceanic environment is the oxidizing environment, the ancient sea water is warm water environment, the paleo climate changes from damp to drought, and it is also the change of the paleo climate. In this sea water environment, a large number of algal organisms are propagated and formed into algal limestone, and the main ore bearing rock.4. has compiled the contour map of the ore body of the Huayuan ore field. The metallogenic process of the Li Mei lead-zinc deposit is analyzed. The characteristics of the deep deposits and the understanding of the tectonic evolution mineralization are deepened. The host rock of the Li Mei type MVT type lead-zinc deposit is dominated by algal limestone, which is produced in the north-east to north to North East to gentle fold and fault tectonic zone formed by the snow peak period - Caledonian tectonic movement. Lead zinc and other elements enrich and mineralized the deposits.

【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：P618.4

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