CAJ | 학술논문

陕西省华县金堆城钼矿床位于东秦岭钼矿带西部,形成于燕山期大陆碰撞体制.矿体产出于金堆城花岗斑岩体内部及其内外接触带.流体成矿过程包括早、中、晚3个阶段,分别以石英-钾长石组合、石英-(钾长石)-多金属硫化物-(碳酸盐)组合和石英-碳酸盐组合为标志,矿石矿物主要沉淀于中阶段.早、中阶段石英中可见纯CO_2包裹体(PC型)、CO_2-H_2O型包裹体(C型)、水溶液包裹体(W型)和含子晶多相包裹体(S型),但晚阶段只发育水溶液包裹体(W型).早阶段C型和W型包裹体均一温度集中于280～370℃,盐度为5.68～11.05 wt%NaCl.eqv;中阶段C型和W型流体包裹体均一温度集中于170～270℃,盐度为5.14～12.63 wt%NaCl.eqv.早、中阶段石英中见S型包裹体,加热过程中子矿物不溶.晚阶段流体包裹体均一温度集中于110～1900C,盐度介于7.17%～11.22 wt%NaCl.eqv之间.估算的早、中阶段流体捕获压力分别为143～243MPa和22～115MPa,推测成矿深度约为2.2～8.1km.金堆城钼矿的成矿流体以富CO_2、贫Cl~-为特征.
합서성화현금퇴성목광상위우동진령목광대서부,형성우연산기대륙팽당체제.광체산출우금퇴성화강반암체내부급기내외접촉대.류체성광과정포괄조、중、만3개계단,분별이석영-갑장석조합、석영-(갑장석)-다금속류화물-(탄산염)조합화석영-탄산염조합위표지,광석광물주요침정우중계단.조、중계단석영중가견순CO_2포과체(PC형)、CO_2-H_2O형포과체(C형)、수용액포과체(W형)화함자정다상포과체(S형),단만계단지발육수용액포과체(W형).조계단C형화W형포과체균일온도집중우280～370℃,염도위5.68～11.05 wt%NaCl.eqv;중계단C형화W형류체포과체균일온도집중우170～270℃,염도위5.14～12.63 wt%NaCl.eqv.조、중계단석영중견S형포과체,가열과정중자광물불용.만계단류체포과체균일온도집중우110～1900C,염도개우7.17%～11.22 wt%NaCl.eqv지간.고산적조、중계단류체포획압력분별위143～243MPa화22～115MPa,추측성광심도약위2.2～8.1km.금퇴성목광적성광류체이부CO_2、빈Cl~-위특정.
The Jinduicheng Mo deposit,Hua County,Shaanxi Province is a giant porphyry Mo deposit formed in the Yanshanian continental collision regime in the west part of the East Qinling molybdenum belt.The ore-body occurs in the Jinduicheng granite porphyry and its inner and outer contact,and the ores are characterized by disseminated multistage stockworks.The hydrothermal oreforming process includes the early,middle and late stages,characterized by mineral assemblages of quartz-potassic feldspar,quartz(potassic feldspar)-polymetal-(carbonate)and quartz-carbonate,respectively.Ore minerals were mainly precipitated in the middle stage.The hydrothermal quartz formed in the early and middle stages contain four types of fluid inclusions(FIs),i.e.pure CO_2 (PC-type),NaCl-H_2O(W-type),CO_2-H_2O(C-type)and daughter mineral-bearing(S-type)fluid inclusions;while the late-stage minerals contain only NaCl-H_2O fluid inclusions(W-type).The homogeneous temperatures of the C-type and W-type FIs in the early stage are mainly 280～370℃,with salinities of ranging from 5.68 to 11.05 wt% NaCl.eqv.The C-type and W-type FIs yield homogeneous temperatures of 170～270℃ and salinities of 5.14～12.63 wt% NaCl.eqv in the middle stage.Daughter minerals in the S-type FIs from the early and middle stage do not melt during heating.FIs of the late stage are homogenized mainly at temperatures of 110 to 190℃,yielding salinities of 7.17 to 11.22 wt% NaCl.eqv.The estimated pressures range from 143～243 MPa in the early stage to 22～115 MPa in the middle stage,respectively,corresponding to depth of 2.2～8.1 km.In a word,the ore-fomring fluids in the Jinduicheng Mo deposit are characterized by high CO2 and low Cl~-.