本文選題：辛莊金礦 + 成因礦物學(xué)��； 參考：《中國地質(zhì)大學(xué)(北京)》2015年碩士論文

【摘要】：山西繁峙縣辛莊金礦床位于華北克拉通中間帶北部,燕山沉降帶西南緣與山西陸臺(tái)五臺(tái)隆起西北側(cè)兩大構(gòu)造單元相互嵌接的中生代構(gòu)造巖漿活動(dòng)帶上。本文系統(tǒng)總結(jié)了辛莊金礦床的區(qū)域地質(zhì)背景、礦床地質(zhì)特征,尤其對(duì)礦石特征進(jìn)行了比較細(xì)致的研究,在此基礎(chǔ)上,以金礦床成因理論為依據(jù),劃分了辛莊金礦的成礦期次與成礦階段,開展了電子探針分析測(cè)試、流體包裹體測(cè)溫以及激光拉曼測(cè)試等工作,探討了礦床成因,并對(duì)典型的金屬硫化物礦物礦物學(xué)特征進(jìn)行了分析。辛莊金礦床劃分為2個(gè)成礦期:ⅰ是巖漿熱液期;ⅱ是表生期,其中巖漿熱液期可以進(jìn)一步劃分為五個(gè)成礦階段:依次是Ⅰ氧化階段、Ⅱ1黃鐵礦-石英階段、Ⅱ2石英-黃鐵礦階段、Ⅲ石英-多金屬硫化物階段和Ⅳ碳酸鹽階段。黃鐵礦電子探針分析:Fe、S虧損卻富Co、Ni,且對(duì)Co/Ni、Au/Ag、S/Se比值計(jì)算;綜合Fe、S特點(diǎn)與三個(gè)特殊元素比值對(duì)特點(diǎn)均表明黃鐵礦屬于巖漿熱液成因。本區(qū)黃鐵礦中富含As元素,As在黃鐵礦中的含量及Fe/S+As值具有很重要的標(biāo)型性,本區(qū)黃鐵礦Fe/S+As均值為0.867。據(jù)此可知,辛莊礦區(qū)的黃鐵礦形成于中偏淺成環(huán)境。對(duì)Co、Ni、As投點(diǎn),從Co頂點(diǎn)區(qū)到As頂點(diǎn)區(qū)均有分布,暗示了成礦早期巖漿水占主要地位而成礦晚期有大氣水的加入。黃鐵礦、黃銅礦、石英是Au的主要載體,且金賦存狀態(tài)有包體金、粒間金、裂隙金三種。根據(jù)包裹體在室溫下的相態(tài)可以將其分為5類:包括Ⅰ富液相包裹體、Ⅱ富氣相包裹體、Ⅲ含子晶包裹體、Ⅳ純氣相包裹體、ⅤCO2三相包裹體,流體包裹體氣相成分為CO2,子礦物鏡下特點(diǎn)呈無色透明、立方體形態(tài),極可能是石鹽。包裹體均一溫度介于127.2℃~407.5℃,溫度、鹽度直方圖中可以得出,溫度范圍260℃~280℃、200℃~240℃,鹽度7%~8%、3%~5%,分別對(duì)應(yīng)Ⅱ2石英-黃鐵階段、Ⅲ石英-多金屬階段這兩大主成礦階段。碳酸鹽階段的均一溫度127.2℃~190.3℃、鹽度介于0.3%~4.2%,總體而言屬于中低溫、低鹽度成礦流體,整個(gè)巖漿熱液期流體密度范圍0.568g/cm3~0.963g/cm3,均值0.818g/cm3,屬于中等密度流體,成礦壓力范圍28.73MPa~201.89MPa,主成礦階段成礦深度集中于3.1Km~5.3Km,屬于淺成成礦環(huán)境。綜述,山西繁峙縣辛莊金礦為一中等密度、低鹽度、淺成中低溫巖漿熱液石英脈型金礦床。
[Abstract]:The Xinzhuang gold deposit in Fanshi County Shanxi Province is located in the northern part of the North China Craton intermediate belt the southwestern margin of the Yanshanian subsidence belt and the Mesozoic tectonic magmatic active belt interwoven with the two tectonic units in the west and north of the Wutai uplift of Shanxi Lutai. In this paper, the regional geological background and geological characteristics of the Xinzhuang gold deposit, especially the ore characteristics, are systematically summarized. On this basis, the genetic theory of the gold deposit is taken as the basis. The metallogenic epoch and metallogenic stage of Xinzhuang gold deposit are divided. The authors have carried out the work of electron probe analysis, fluid inclusion temperature measurement and laser Raman measurement, and discussed the genesis of the deposit. The mineralogical characteristics of typical metallic sulphide minerals are also analyzed. The Xinzhuang gold deposit can be divided into two metallogenic periods: I is the magmatic hydrothermal period, II is the epigenetic period, among which the magmatic hydrothermal period can be further divided into five metallogenic stages: I oxidation stage, 鈪，

本文編號(hào)：1825456