| 周栋,赵太平,赵鹏彬,张晓团.豫西康山金银铅锌矿床绿泥石电子探针成分特征及其地质意义[J].矿产勘查,2018,9(5):803-824 |
| 豫西康山金银铅锌矿床绿泥石电子探针成分特征及其地质意义 |
| Chlorite EPMA characteristic and its geological significance of the Kangshan Au-Ag-Pb-Zn deposit in west of Henan |
| 投稿时间：2018-01-04 |
| DOI： |
| 中文关键词: 绿泥石 电子探针 地质意义 康山金银铅锌矿床 豫西 |
| 英文关键词: chlorite,EPMA,geological significance,Kangshan Au-Ag-Pb-Zn deposit,western Henan |
| 基金项目:国家自然科学基金(编号:41402047)和陕西省公益性地质调查项目(编号:20170102、20180310)联合资助。 |
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| 中文摘要: |
| 康山构造蚀变岩型和石英脉型金银铅锌矿床绿泥石电子探针成分分析显示,矿床中的绿泥石有两种成因类型:① 围岩中铁镁矿物发生交代形成(围岩中的绿泥石)；② 直接从热水溶液中沉淀(与成矿有关的绿泥石)。其中,围岩中的绿泥石呈细小的放射状、菊花状,与成矿有关的绿泥石呈鳞片状、团块状。围岩中的绿泥石和与成矿有关的绿泥石的Fe/(Fe+Mg)比值和AlⅣ含量分别变化于0.53~0.67和0.65~0.71,2.21~2.75和1.89~2.69,暗示形成绿泥石的流体来源具有多源性。绿泥石的地质温度计显示,围岩中的绿泥石和与成矿有关的绿泥石的温度分别变化于250℃~310℃和220℃~310℃,暗示从围岩到矿化带温度逐渐升高。综合前人同位素研究成果,文章认为康山矿床成矿流体有岩浆热液、太华岩群和官道口群物质的贡献,成矿热液可能来源于区域上的岩浆热液和地层物质脱碳脱水的混合。该脱碳脱水作用可能由区域隐伏岩体的侵位及马超营断裂带的活动引起。 |
| 英文摘要: |
| The structural alteration type and the electronic probe component analysis of chlorites in Kangshan Au-Ag-Pb-Zn deposit show that the chlorites formed in two possible modes:1) By replacing the ferromagnesian minerals in the host rock(chlorites in host rock; 2) Precipitated directly from hydrothermal fluids(chlorites related to mineralization). Among them, the chlorites in the host rock appeared as fine radial and chrysanthemum shape, and the chlorites relating to the mineralization show scale-like and massive shape. Fe/(Fe + Mg) ratios and the Al IV content in the chlorites of host rock vary in the ranges of 0.53~0.67and 0.65~0.71 respectively, and in the chlorites relating to the mineralization vary in the ranges of 2.21~2.75 and 1.89~2.69 separately, suggesting that the formation of chlorite fluid has more than one source. Geological thermometer of chlorites shows that the formation temperatures of chlorites in host rock increased gradually from 220C to 310°C, and the temperatures of chlorites relating to the mineralization increased from 250 to 310°C. Both of the chlorite EPMA characteristics and previous C-H-O-S-Pb isotopes studies demonstrate that the ore-forming fluids and materials of the Kangshan Au-Ag-Pb-Zn deposit were derived from the magmatic fluids, with the involvement of the materials coming from Taihua group and Guandaokou group, the ore-forming hydrothermal fluid may be derived from the mixing of magmatic hydrothermal fluid and stratum material decarburization and dehydration in the region. The dehydration may be caused by the emplacement of regional concealed rock and the activities of Maochaoying fault zone. |
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