云南三江地区核桃坪、金厂河矿床成矿流体研究

发布时间：2018-04-30 11:18

  本文选题：核桃坪矿床 + 金厂河矿床　； 参考：《中国地质大学(北京)》2017年硕士论文

【摘要】：核桃坪Pb-Zn多金属矿床和金厂河Fe-Cu-Pb-Zn多金属矿床位于云南省保山市瓦窑镇以北,是保山地块中典型的多金属矽卡岩型矿床。核桃坪和金厂河矿床主要的富矿岩层为寒武系地层,褶皱和断裂构造较为发育,岩浆岩出露较少。本文分别在核桃坪矿床的上厂矿段、本部矿段、回子洞矿段和金厂河矿床的1810中段、1750中段、1720中段进行了样品采集,主要采集了金属硫化物和石英等脉石矿物共生的样品,并对主成矿阶段的流体包裹体进行了详细的显微测温、激光拉曼和氢氧同位素分析。核桃坪和金厂河矿床中主成矿期的流体特征相似,包裹体的类型以纯液相、纯气相、气液两相为主,部分样品中也可见CO_2三相包裹体,形状可见似椭圆形、负晶形、方形、不规则形等,大小一般集中于5-20μm左右,成群或孤立分布;显微测温实验结果表明两相水盐体系包裹体的均一温度和盐度均较低,核桃坪矿床的均一温度集中于150-230℃,盐度集中于1-5 wt%Na Cl.eqv、6-13 wt%NaCl.eqv和14-17 wt%NaCl.eqv三个区间。金厂河矿床的均一温度集中于150-210℃,盐度集中于1-9 wt%NaCl.eqv和10-14wt%NaCl.eqv;对石英中的包裹体进行了激光拉曼分析,结果表明核桃坪和金厂河矿床成矿流体的气相成分都含有N2、CH4、CO_2和H_2O,而液相成分主要为H_2O;由氧同位素地质温度计和水盐体系等容线,可得核桃坪矿床的平均成矿温度为160-210℃,平均成矿压力为16.23-41.81 MPa。金厂河矿床的平均成矿温度为184℃,平均成矿压力为27.87 MPa;金属硫化物中包裹体的氢氧同位素组成与脉石矿物相比,可以直接指示成矿期流体的来源,在本文的δD-δ~(18)O关系图上可见,核桃坪和金厂河矿床硫化物中包裹体的氢氧同位素数据点均位于大气降水线附近,并向岩浆水发生了氧同位素漂移,表明成矿期流体的来源主要为大气降水,同时也混入有岩浆水。
[Abstract]:The Juzuping Pb-Zn polymetallic deposit and the Jinchanghe Fe-Cu-Pb-Zn polymetallic deposit are typical polymetallic skarn deposits in Baoshan massif, located north of Wayao Town, Baoshan City, Yunnan Province. The main ore-rich strata in the Juuping and Jinchanghe deposits are Cambrian strata, the fold and fault structures are relatively developed, and the magmatic rocks are less exposed. In this paper, samples were collected from Shangchang, Huizidong, Huizidong and Huizhihe ore deposits, respectively. The samples of gangue minerals such as metallic sulphide and quartz were collected. Detailed microthermometry, laser Raman and hydrogen-oxygen isotopic analysis of fluid inclusions in the main metallogenic stage were carried out. The fluid characteristics of the main metallogenic epoch in the Juzuping and Jinchanghe deposits are similar. The inclusions are mainly composed of pure liquid phase, pure gas phase and gas-liquid phase. The CO_2 three-phase inclusions can also be seen in some samples, with a shape of ellipse, negative crystal shape and square shape. The results of microscopic temperature measurement show that the inclusions of the two-phase water-salt system have lower homogenization temperature and salinity, and the homogenization temperature of the walnut flat deposit is concentrated at 150-230 鈩，

本文编号：1824354