• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Ore Geology Reviews: Journal for Comprehensive Studies of Ore Genesis and Ore Exploration >Geology and geochemistry of Gunung Subang gold deposit, Tanggeung, Cianjur, West Java, Indonesia
【24h】

Geology and geochemistry of Gunung Subang gold deposit, Tanggeung, Cianjur, West Java, Indonesia

机译：亚阳金矿山，唐刚，锡安尔，西爪哇，印度尼西亚地质和地球化学

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The Gunung Subang gold deposit is located in the Sunda arc volcanic belt in West Java, Indonesia. The ore bodies are associated with volcanic rocks from the Miocene Koleberes and Bentang Formation. To constrain the significance of the ore genesis and mineralization, this study was carried out with the aim of examining the deposit using methods such as detailed field observation, petrography, petrochemistry, zircon U-Pb dating, Hf isotope, fluid inclusion analysis, and sulfur and in-situ Pb isotope analyses. The results suggest the following. (1) The volcanic rocks in Gunung Subang belong to the basalt-andesite group, with 48.66-79.17% (average 61.04%) SiO2. The trace element patterns of the volcanic rocks exhibit relatively low HREE content, flat HREE patterns, and weak negative or positive Eu anomalies, which are similar to those of typical arc magmatic rocks. (2) Most zircons selected from the volcanic rocks are magmatic, and only a few are inherited. The magmatic zircons have a weighted mean U-Pb age of 17.0 +/- 0.4 Ma, and the inherited zircons are from the Precambrian, dated at 887-2379 Ma. The magmatic zircons have epsilon(Hf)(t) values ranging from -1.24 to 13.59, indicating that the magmatism may be contaminated, predominantly with juvenile crust but also with a small percentage of ancient crust. (3) The sulfur isotopic compositions are fairly uniform, and the delta S-34 values of pyrite, galena, and sphalerite range from 0.53 to 2.97 parts per thousand, suggesting a magmatic origin. (4) The Pb isotopic compositions of pyrite and galena are clustered, and some include relatively high amounts of radiogenic lead. The mean ratios of Pb-206/Pb-204, Pb-207/Pb-204, and Pb-208/Pb-204 are 18.59 +/- 0.007, 15.65 +/- 0.007 and 38.89 +/- 0.017, respectively, indicating that the ore-forming material is highly related to Miocene to Pliocene volcanic rocks. (5) Fluid inclusions in the quartz from the ores are liquid and vapor-liquid phases, with components of the NaCl-H2O system with homogenization temperatures of 240-320 degrees C and salinities of 0.2-6.2 wt% NaCl. The coexistence of vapor and liquid-rich fluid inclusions suggests that boiling occurred throughout the deposition of the ore. (6) The results of Electron Probe Microanalysis (EPMA) indicate that pyrite is the major Au-bearing mineral. Combined with the observation of scanning electron microscope (SEM), gold is primarily present as Au-Ag-telluride minerals, and there may also be native gold (Au-0). Finally, we consider the Gunung Subang is an epithermal gold deposit related to the Mid-Miocene magmatism.
机译：Gunung Subang金矿床位于印度尼西亚西爪哇省Sunda弧火山腰带。矿体与来自中新世牛油和Bentang形成的火山岩有关。为了限制矿石创世纪和矿化的重要性，本研究采用了使用详细的田间观察，岩化，石化，锆石U-Pb约会，HF同位素，流体包容性分析和硫磺的方法来检查沉积物和原位Pb同位素分析。结果表明以下内容。 （1）Gunung Subang的火山岩属于玄武岩群体，48.66-79.17％（平均61.04％）SiO2。火山岩的痕量元素图案表现出相对较低的HREE含量，平坦的HREE模式和弱负面或正欧盟异常，其类似于典型的弧形岩石岩石。 （2）从火山岩中选择的大多数锆石都是岩浆，只有少数人遗传。岩浆锆锆的加权平均值U-PB年龄为17.0 +/- 0.4 mA，并且继承的锆石来自Precambrian，日期为887-2379 mA。岩浆氧化锆具有从-1.24至13.59的epsilon（hf）（t）值，表明岩浆术可能被污染，主要是少年地壳，但也具有一小部分古代地壳。 （3）硫同位素组合物是相当均匀的，达钛矿，高级硫化纳和斯巴尔的ΔS-34值范围为0.53至2.97份，表明岩浆起源。 （4）聚集黄铁矿和加勒纳的Pb同位素组合物，其中一些包括相对大量的辐射铅。 PB-206 / PB-204，PB-207 / PB-204和PB-208 / PB-204的平均比例分别为18.59 +/- 0.007,15.65 +/- 0.007和38.89 +/- 0.017，表明形成矿石材料与西烯至全茂火山岩岩石的高度相关。 （5）从矿石中石英中的流体夹杂物是液体和蒸汽液相，其中NaCl-H2O系统的组分，均匀化温度为240-320℃，盐度为0.2-6.2wt％NaCl。蒸汽和富液体流体夹杂物的共存表明在整个矿石沉积中发生沸腾。 （6）电子探针微透析（EPMA）的结果表明黄铁矿是主要的携带矿物。结合扫描电子显微镜（SEM）的观察，黄金主要作为Au-Ag-碲化物矿物存在，并且也可能存在天然金（Au-0）。最后，我们认为Gunung Subang是与中间岩岩岩岩有关的卵形金矿床。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号