| 祁雨沟地区金矿床稳定同位素研究 |
| 点此下载全文 |
| 引用本文：.1994.Stable isotope studies of gold deposlts in Qiyugou area, Henan province[J].Mineral Deposits,13(4):354~362 |
| Hits: 2855 |
| Download times: 1835 |
|
| 基金项目:中国科学院矿床地球化学开放研究实验室资助项目 |
|
| 中文摘要:对河南嵩县祁雨沟地区角砾岩型金矿床和蚀变岩型金矿床稳定同位素研究表明．两类矿床具有同一成矿流体来源——岩浆水，在早期一主期成矿阶段成矿流体以岩浆水为主，晚期矿化流体加入了相当数量的大气水。铅同位素组成表明金矿床的成矿物质与区内钙碱性花岗岩成岩物质皆主要来自上地幔，混合铅的存在指示了上地壳成矿物质加入岩浆热液中，参与了金矿床的成矿作用。 |
| 中文关键词:稳定同位素 金矿床 河南祁雨沟 |
| |
| Stable isotope studies of gold deposlts in Qiyugou area, Henan province |
|
|
| Abstract:In Qiyugou area of Henan Province there are cryptoexplosive breccias type and structurally shattered altered rock type gold deposits, which are closely related to the distribution of the Middle-Late Yanshanian calc-alka-line granitoids. Recent studies show that the two types of gold deposits were formed at the same time and have similar hydrothernal alteration-mineralization characteristics, and that their whole mineralization process might be divided temporally into “fore”, “main” and “late” alteration-mineralization phases. The two types of gold deposits are extremely similar to each other in stable isotope features, suggesting the cognate nature of these deposits, Hydrogen, oxygen, canbon and sulfur isotopic studies imply the magmatic water nature of the ore-forming fluid at the main metallogenic phase and the addition of considerable amounts of meteoric water to the ore-forming fluid at the late metallogenic phase. The high degree of sulfur isotope homogenization and the similar lead isotope composition between the granite complexes and the gold deposits demonstrate that ore materials of the gold deposits and rock-forming materials of the calc-alkaline granitoids were all derived from the upper mantle, with the entry of small amounts of upper crust lead into the ore-forming fluid. The breccias type gold deposits are somewhat different from the altered rock type gold deposits in sulfur and carbon isotopic composition, which accounts for the fact that the breccia body served as the center of the ore-forming fluid activity, and outwards, the composition of the ore-forming fluid varied to some extent. |
| keywords:stable isotope, gold deposit, Qiyugou of Henan |
| View Full Text View/Add Comment Download reader |
|
|
|
