CAJ | 학술논문

荷花坪锡多金属矿床是湘南地区新发现的一大型矿床,主要由印支期矽卡岩型矿石和燕山期蚀变碎裂岩型矿石所组成,且以前者为主体。本文在详细的野外调查和岩相学观察基础上,将区内印支期成矿分为三个成矿阶段(I-含锡矽卡岩阶段； II-硫化物阶段； III-石英-方解石阶段),燕山期成矿分为两个阶段(I-锡石-硫化物阶段；II-方解石阶段)。对不同期石英、绿柱石、方解石等矿物中流体包裹体的研究表明,荷花坪矿床包裹体类型主要为 H2O-NaCl 型、H2O-NaCl-CO2型和少量纯 CO2型。显微实验结果显示,印支期成矿流体主要为低盐度(ω(NaCleq)=3%~10%)的H2O-NaCl和H2O-NaCl-CO2以及少量富CO2流体。三个成矿阶段的完全均一温度分别为290~390℃、190~260℃和140~180℃。成矿早阶段流体中含较多 CO2,晚阶段 CO2含量减少,主要为H2O-NaCl,且Ca2+、Mg2+含量增高。燕山期成矿流体亦为低盐度(ω(NaCleq)=2%~10%)H2O-NaCl和H2O-NaCl-CO2,二个成矿阶段的完全均一温度分别为190~340℃和130~170℃,成矿早阶段流体中含较多CO2,晚阶段CO2含量减少,主要为NaCl-H2O。两期成矿从早到晚都呈现出盐度降低、密度增大的变化趋势。区内成矿流体主要来自岩浆和地下水热液,成矿早阶段以岩浆流体为主,晚阶段以地下水为主。区内锡成矿主要与含CO2的流体以及流体的沸腾作用有关,铅锌矿化主要与盐-H2O溶液流体作用关系密切。
하화평석다금속광상시상남지구신발현적일대형광상,주요유인지기석잡암형광석화연산기식변쇄렬암형광석소조성,차이전자위주체。본문재상세적야외조사화암상학관찰기출상,장구내인지기성광분위삼개성광계단(I-함석석잡암계단； II-류화물계단； III-석영-방해석계단),연산기성광분위량개계단(I-석석-류화물계단；II-방해석계단)。대불동기석영、록주석、방해석등광물중류체포과체적연구표명,하화평광상포과체류형주요위 H2O-NaCl 형、H2O-NaCl-CO2형화소량순 CO2형。현미실험결과현시,인지기성광류체주요위저염도(ω(NaCleq)=3%~10%)적H2O-NaCl화H2O-NaCl-CO2이급소량부CO2류체。삼개성광계단적완전균일온도분별위290~390℃、190~260℃화140~180℃。성광조계단류체중함교다 CO2,만계단 CO2함량감소,주요위H2O-NaCl,차Ca2+、Mg2+함량증고。연산기성광류체역위저염도(ω(NaCleq)=2%~10%)H2O-NaCl화H2O-NaCl-CO2,이개성광계단적완전균일온도분별위190~340℃화130~170℃,성광조계단류체중함교다CO2,만계단CO2함량감소,주요위NaCl-H2O。량기성광종조도만도정현출염도강저、밀도증대적변화추세。구내성광류체주요래자암장화지하수열액,성광조계단이암장류체위주,만계단이지하수위주。구내석성광주요여함CO2적류체이급류체적비등작용유관,연자광화주요여염-H2O용액류체작용관계밀절。
The Hehuaping tin-polymetallic deposit is a large-size tin-polymetallic orefield newly discovered in southern Hunan Province. It consists of Indosinian skarn-type ores and Yanshanian altered-cataclastite-type ores. Four ore bodies have been explored, which are located in the southeast portion of the Wangxianling Indosinian granite pluton and hosted in granite, granite porphyry, and Devonian limestone, dolomitite and sandstone, respectively. Based on detailed field investigation and petrographic observation, the authors carried out microthermometric studies of fluid inclusions in quartz, berylite and calcite in different types of ores. Three stages of Indosinian skarn-type ores have been distinguished, i.e., Stage I-cassiterite and skarn stage, StageⅡ-sulfide stage, and StageⅢ-quartz and calcite stage. Fluid inclusions in the skarn-type ores can be divided into three types:H2O-NaCl type, H2O-NaCl-CO2 type, and minor pure CO2 type. Experimental results show that the homogenization temperatures are from 290℃to 390 ,℃ from 190 to 260 and℃ ℃ from 140 to 180 for℃ ℃ Stage I, II and III, respectively. The fluid inclusions at Stage I are enriched in CO2, whereas those at the late stage (Stage II, Stage III) are enriched in NaCl-H2O, with minor amounts of Ca2+, Mg2+ions. In addition, the two major stages of Yanshanian altered cataclastite-type ores have been distinguished: Stage I-cassiterite-sulfide stage, and Stage II-calcite stage. Yanshanian fluid inclusions can be divided into H2O-NaCl type and H2O-NaCl-CO2 type. The homogenization temperatures are from 190 to 340 and℃ ℃ from 130 to 170 for℃ ℃ Stage I and II, respectively. The composition of the fluid inclusions at Stage I are enriched in CO2, whereas those at Stage II are enriched in NaCl-H2O. The characteristics of fluid inclusions in the Hehuaping deposit indicate that the fluid was derived from granites and groundwater. At the early stage the fluid was mainly magmatic fluid, but at later stages the fluid was dominated by groundwater. The fluid that was enriched in CO2 and the fluid that boiled at the early stage possibly led to cassiterite precipitation, and the mineralization of lead and zinc was related to NaCl-H2O fluid.