| 新疆乔尕山和粤西河台韧性剪切带金矿床中熔融包裹体的发现及矿床成因 |
| 点此下载全文 |
| 引用本文：.2001.The Discovery of Melt Inclusions in Hetai and Qiaogashan Ductile Shear Zone Gold Deposits and the Genetic Study of Their Deposits[J].Mineral Deposits,20(3):208~215 |
| Hits: 2382 |
| Download times: 1975 |
|
| 基金项目:国家自然科学基金（编号：4987301S、49703043）、高等学校博士学科点号项研究基金（编号：98055807）和广东省自然科学基金(编号：001255) |
|
| 中文摘要:乔尕山和河台金矿床属典型韧性剪切带金矿床，分别产丁志留泥盆系及震旦系云开群地层中。在2个矿床含金石英脉及糜棱岩中首次发现了熔融包裹体及流体-熔融包裹体，对解决此类型矿床成因具重大意义。乔尕山金矿床包裹体均一温度：熔融包裹体为900~ 1100℃，液相包裹体为285~ 390℃：河台金矿包裹体均一温度：熔融包裹体为870℃，不混熔液相包裹体为530℃，液相包裹体为180~ 350℃。前者流体性质属Na+-K+- Ca2+-SO42--HCO3--Cl-体系；后者流体性质属K+-Ca2+-Mg2+-Na+-SO42--HCO3--Cl-体系。运用电子显微镜能谱对熔融包裹体子矿物进行分析，鉴定出石英、钾长石、硅灰石及铝硅酸盐等9种子矿物，它们分别组成不同矿物组合，为熔融包裹体在矿脉中存在提供了重要的实验依据。在变质深熔作用及强烈动力变质作用下，沉积变质岩可以形成铝硅酸盐熔融体，具烙体-流体性质，成矿与多阶段铝硅酸盐熔体及流体作用相关。 |
| 中文关键词:韧性剪切带 金矿床 熔融包裹体 成矿流体 矿床成因 |
| |
| The Discovery of Melt Inclusions in Hetai and Qiaogashan Ductile Shear Zone Gold Deposits and the Genetic Study of Their Deposits |
|
|
| Abstract:The Qiaogashan gold deposit and the Hetai gold deposit are two typical ductile shear gold deposits, which are hosted in Silurian- Devonian strata and Sinian Yunkai Group respectively . In this research, the authors have discovered for the first time melt inclusions and fluid melt inclusions in ore- bearing quartz and mylonites of these two deposits , which is of great significance in solving the genetic problem of this type of gold deposits. The homogenization temperatures of melt inclusions and liquid inclusions in the Qiaogashan gold deposit are 900 ~ 1100℃ and 285 ~ 390℃ respectively. The ore-forming fluids are of Na+-K+- Ca2+-SO42--HCO3--Cl- system. The homogenization te mperatures of melt inclusions , unmixed liquid inclusions and liquid inclusions in the Hetai gold deposit are 870℃, 530℃ and 180 ~ 350℃ respectively. The ore-forming fluids belong to K+-Ca2+-Mg2+-Na+-SO42--HCO3--Cl- system. The daughter minerals of melt inclusions were analyzed by means of SEM. Quartz, orthoclase, wollastonite, sialicate and other five minerals were identified, which respectively formed unique mineral asse mblages. This analysis has further proved the existence of melt inclusions in ore veins. Sedimentary metamorphic rocks could form sialicate melt characterized by melt to fluid features under the condition of metamorphic anatexis and severe dynamic metamorphism. The ore-forming process was related to multi-stage sialicate melt and fluid actions. |
| keywords:ductile shear zone , gold deposit, melt inclusion, ore-forming fluid, ore genesis |
| View Full Text View/Add Comment Download reader |
