發(fā)布時(shí)間：2018-04-30 11:18

  本文選題：核桃坪礦床 + 金廠河礦床�。� 參考：《中國(guó)地質(zhì)大學(xué)(北京)》2017年碩士論文

【摘要】：核桃坪Pb-Zn多金屬礦床和金廠河Fe-Cu-Pb-Zn多金屬礦床位于云南省保山市瓦窯鎮(zhèn)以北,是保山地塊中典型的多金屬矽卡巖型礦床。核桃坪和金廠河礦床主要的富礦巖層為寒武系地層,褶皺和斷裂構(gòu)造較為發(fā)育,巖漿巖出露較少。本文分別在核桃坪礦床的上廠礦段、本部礦段、回子洞礦段和金廠河礦床的1810中段、1750中段、1720中段進(jìn)行了樣品采集,主要采集了金屬硫化物和石英等脈石礦物共生的樣品,并對(duì)主成礦階段的流體包裹體進(jìn)行了詳細(xì)的顯微測(cè)溫、激光拉曼和氫氧同位素分析。核桃坪和金廠河礦床中主成礦期的流體特征相似,包裹體的類型以純液相、純氣相、氣液兩相為主,部分樣品中也可見(jiàn)CO_2三相包裹體,形狀可見(jiàn)似橢圓形、負(fù)晶形、方形、不規(guī)則形等,大小一般集中于5-20μm左右,成群或孤立分布;顯微測(cè)溫實(shí)驗(yàn)結(jié)果表明兩相水鹽體系包裹體的均一溫度和鹽度均較低,核桃坪礦床的均一溫度集中于150-230℃,鹽度集中于1-5 wt%Na Cl.eqv、6-13 wt%NaCl.eqv和14-17 wt%NaCl.eqv三個(gè)區(qū)間。金廠河礦床的均一溫度集中于150-210℃,鹽度集中于1-9 wt%NaCl.eqv和10-14wt%NaCl.eqv;對(duì)石英中的包裹體進(jìn)行了激光拉曼分析,結(jié)果表明核桃坪和金廠河礦床成礦流體的氣相成分都含有N2、CH4、CO_2和H_2O,而液相成分主要為H_2O;由氧同位素地質(zhì)溫度計(jì)和水鹽體系等容線,可得核桃坪礦床的平均成礦溫度為160-210℃,平均成礦壓力為16.23-41.81 MPa。金廠河礦床的平均成礦溫度為184℃,平均成礦壓力為27.87 MPa;金屬硫化物中包裹體的氫氧同位素組成與脈石礦物相比,可以直接指示成礦期流體的來(lái)源,在本文的δD-δ~(18)O關(guān)系圖上可見(jiàn),核桃坪和金廠河礦床硫化物中包裹體的氫氧同位素?cái)?shù)據(jù)點(diǎn)均位于大氣降水線附近,并向巖漿水發(fā)生了氧同位素漂移,表明成礦期流體的來(lái)源主要為大氣降水,同時(shí)也混入有巖漿水。
[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，

本文編號(hào)：1824354