CAJ | 학술논문

甘肃花黑滩钼矿床位于北山造山带南带柳园地区,矿体产在花牛山碱长花岗岩与蓟县系平头山组接触带中。热液成矿过程包括早、晚两个阶段,矿物组合分别以石英-多金属硫化物和石英-(碳酸盐)-黄铁矿为标志,矿石矿物主要沉淀于早阶段。早阶段石英中发育富液二相包裹体、富气二相包裹体、含CO2三相包裹体和纯液相流体包裹体,均一温度范围为583~342℃,盐度范围为16.53%~15.67%NaCl,属高温、中等盐度流体。晚阶段石英中发育富液二相包裹体和纯液相流体包裹体,均一温度范围为306~142℃、盐度范围为15.66%~12.62%NaCl。从早阶段演化到晚阶段,流体温度显著降低,盐度变化不明显。矿石硫化物δ34S值大多为正值(1个样品为负值),范围集中于3.3‰~3.9‰,均一化程度较高,暗示矿石硫主要来自岩浆,有少量地层硫的贡献。围岩成矿元素分析表明,成矿物质主要源于花牛山碱长花岗岩。结合地质特征,认为该矿床属高温岩浆热液矿床,与花牛山碱长花岗岩成因联系密切。
감숙화흑탄목광상위우북산조산대남대류완지구,광체산재화우산감장화강암여계현계평두산조접촉대중。열액성광과정포괄조、만량개계단,광물조합분별이석영-다금속류화물화석영-(탄산염)-황철광위표지,광석광물주요침정우조계단。조계단석영중발육부액이상포과체、부기이상포과체、함CO2삼상포과체화순액상류체포과체,균일온도범위위583~342℃,염도범위위16.53%~15.67%NaCl,속고온、중등염도류체。만계단석영중발육부액이상포과체화순액상류체포과체,균일온도범위위306~142℃、염도범위위15.66%~12.62%NaCl。종조계단연화도만계단,류체온도현저강저,염도변화불명현。광석류화물δ34S치대다위정치(1개양품위부치),범위집중우3.3‰~3.9‰,균일화정도교고,암시광석류주요래자암장,유소량지층류적공헌。위암성광원소분석표명,성광물질주요원우화우산감장화강암。결합지질특정,인위해광상속고온암장열액광상,여화우산감장화강암성인련계밀절。
The Huaheitan hydrothermal molybdenum deposit is located in the Liuyuan region, the southern Beishan area. The orebodies occur in the contact zone between the Huaniushan granite pluton and hornfels of the Mesoproterozoic Stenian Pingtoushan Formaion. The hydrothermal ore-forming process includes the early s quartz-polymetal sulfides stage and the late quartz-pyrite stage. Four main types of fluid inclusions are recognized:(1) two-phase liquid-rich inclusions, (2) two-phase gas-rich inclusions, (3) three-phase CH4-CO2-H2O inclusions, and (4) vapor inclusions. The fluids at the early stage have high temperatures (583 ℃ to 342 ℃) and moderate salinities (16.53%to 15.63%NaCl equivalent), whereas fluids at the late stage have low temperatures of 306 ℃to 142 ℃ and moderate salinities of 15.66% to 12.62% NaCl equivalent. The temperature of the ore-forming fluids decreased obviously, while the salinity nearly unchanged. Most sulfur isotope values of the sulfides give a narrow δ34S interval of +3.3‰ to +3.9‰ (except one sample), indicating a predominant magmatic sulfur origin. The analyses of the ore-forming elements of the wallrocks show that the ore-forming materials are mainly from the Huaniushan granite. We suggest that the Huaheitan Mo mineralization was resulted from the emplacement of the Huaniushan granite.