• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nature >Gold concentrations of magmatic brines and the metal budget of porphyry copper deposits
【24h】

Gold concentrations of magmatic brines and the metal budget of porphyry copper deposits

机译：岩浆盐水的金浓度和斑岩铜矿床的金属预算

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

Porphyry copper-molybdenum-gold deposits are the most important metal resources formed by hydrothermal processes associated with magmatism. It remains controversial, however, whether the metal content of porphyry-style and other mag-matic-hydrothermal deposits is dominantly controlled by metal partitioning between magma and an exsolving magmatic fluid phase or by scavenging of metals from solid upper-crustal rocks by surface-derived fluids. It also remains unknown to what degree the metal content in such deposits is affected by selective mineral precipitation from the ore fluid. Extremely saline fluids4, precipitating quartz and ore minerals in veins have been inferred to have a significant magma-derived component, on the basis of geological, isotopic and experimental evidence. Here we report gold and copper concentrations of single fluid inclusions in quartz, determined by laser-ablation inductively coupled plasma mass spectrometry. The results show that the Au/Cu ratio of primary high-temperature brines is identical to the bulk Au/Cu ratio in two of the world's largest copper-gold ore bodies. This indicates that the bulk metal budget of such deposits is primarily controlled by the composition of the incoming fluid, which is, in turn, likely to be controlled by the crystallization process in an underlying magma chamber.
机译：斑岩铜-钼-金矿床是与岩浆作用有关的热液作用形成的最重要的金属资源。然而，斑岩型和其他岩浆热液矿床的金属含量是主要控制是由岩浆和溶蚀的岩浆流体相之间的金属分配还是通过表面固结上地壳岩石中的金属清除来控制？衍生流体。还不清楚这种矿床中金属含量受矿石流体选择性矿物沉淀影响的程度。根据地质，同位素和实验证据，已经推断出盐分极高的流体4会沉淀出静脉中的石英和矿石矿物，具有重要的岩浆来源成分。在这里，我们报告了通过激光烧蚀电感耦合等离子体质谱法测定的石英中单个流体夹杂物的金和铜浓度。结果表明，在两个世界最大的铜金矿体中，一次高温盐水的Au / Cu比值与总Au / Cu比值相同。这表明这种沉积物的大块金属收支主要由进入流体的组成控制，而流入流体的组成又可能受下伏岩浆室中的结晶过程控制。

著录项

  • 来源
    《Nature》 |1999年第6737期|p.676-679|共4页
  • 作者

    T. Ulrich; D. Guenther; C. A. Heinrich;

  • 作者单位
  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
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