• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文学位 >Fluid characteristics and evolution of porphyry Cu-Au-Mo and Mo systems, Yukon-British Columbia, Canada.
【24h】

Fluid characteristics and evolution of porphyry Cu-Au-Mo and Mo systems, Yukon-British Columbia, Canada.

机译：加拿大育空-不列颠哥伦比亚省斑岩型铜-金-钼和钼系统的流体特征和演化。

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

Geochemical techniques (isotopic, major, trace, and rare earth elements, fluid inclusion, solute chemistry) have been used to investigate porphyry mineralization of the Canadian Cordillera. Specifically, the Endako porphyry Mo deposit, central British Columbia, and the Casino, Cash, and Mt. Nansen Cu-Au-Mo occurrences of the Yukon were studied with the objective of characterizing the hydrothermal fluids associated with alteration and mineralization and subsequently to produce a more comprehensive understanding of these systems. The crystalline rocks neighboring the porphyry occurrences in the Yukon were also studied with the objective of understanding their protoliths and tectonic setting during formation.;The low fluorine Endako porphyry Mo deposit is characterized by early quartz +/- molydenite stockwork veins, with K-feldspar-bearing selvages and paragenetically later quartz-molybdenite ribbon veins, with sericite-bearing selvages. Oxygen isotope, fluid inclusion and solute chemistry studies indicate the involvement of hydrothermal fluids, exsolved from a crystallizing melt, in the formation of the Endako molybdenum deposit. However, hydrogen isotope compositions suggest the early involvement of meteoric water in the ore forming fluids and ore genesis.;The geochemical characteristics of the Devonian-Mississippian rocks of west-central Yukon indicate that the Yukon was a land mass outboard of North America representing a continental arc during Devonian-Mississippian times. The mid-Cretaceous Dawson Range batholith represents magmas crustally derived of the Precambrian basement of the Yukon. Whereas, the late Cretaceous plutons, genetically related to porphyry Cu mineralization, are associated with magmas that were derived from a mantle source contemporaneous with subduction.;Biotites in granitic rocks altered by mineralizing fluids of the Casino occurrence possess elemental compositions distinct from biotites in neighboring unaltered granitic rocks. The observed chemical trends are similar to those reported from other porphyry Cu deposits; however, the absolute elemental contents are variable between porphyry Cu deposits. Calculated fugacity ratios of the hydrothermal fluids of porphyry Cu deposits suggest that log fH2O/fHCl and log fHF/ fHCl are similar; whereas, log fH2O/ fHF values are variable.;Isotopic compositions (H, Sr, Pb, Ar) of primary mineralizing fluids associated with porphyry Cu-Au-Mo mineralization of the west-central Yukon indicate that fluids are composed of mixed non-magmatic and magmatic fluids. This hypothesis is atypical to the generally accepted thinking of fluid origin of porphyry Cu systems.
机译：地球化学技术（同位素，主要，痕量和稀土元素，流体包裹体，溶质化学）已用于调查加拿大山脉的斑岩矿化作用。特别是Endako斑岩钼矿床，不列颠哥伦比亚省中部以及Casino，Cash和Mt.研究了育空地区南森铜金钼矿的发生，其目的是表征与蚀变和矿化有关的热液，然后对这些系统有更全面的了解。还研究了育空地区斑岩附近的结晶岩，目的是了解它们在形成过程中的原生岩和构造环境。低氟Endako斑岩型钼矿床的特征是早期的石英+/-辉钼矿储层脉和钾长石。 -含绢布的边沿和方解石学之后的石英-辉钼矿带状脉带和绢云母。氧同位素，流体包裹体和溶质化学研究表明，从结晶熔体中溶解出来的热液参与了Endako钼矿床的形成。然而，氢同位素组成表明，流水很早就参与了成矿流体和成因过程中;育空地区中西部的泥盆纪-密西西比岩的地球化学特征表明，育空地区是北美的一块陆地。泥盆纪-密西西比时期的大陆弧。白垩纪中段的道森山脉岩基代表了育空前寒武纪基底地壳。而与斑岩型铜矿化有遗传关系的晚白垩纪岩体与源自俯冲的地幔源岩浆有关。赌场中矿化流体改变了花岗岩岩石中的黑云母，其元素组成与附近的黑云母不同。未变的花岗质岩石。观察到的化学趋势与其他斑岩型铜矿床报道的相似。然而，斑岩铜矿床之间的绝对元素含量是可变的。斑岩型铜矿床水热流体的逸度比值表明log fH2O / fHCl和log fHF / fHCl相似。育空地区中西部斑岩型Cu-Au-Mo矿化伴生的主要矿化流体的同位素组成（H，Sr，Pb，Ar）的同位素组成（H，Sr，Pb，Ar）表明该流体是由非岩浆和岩浆流体。该假设与斑岩型铜系统流体成因的普遍接受的思想是非典型的。

著录项

  • 作者

    Selby, David.;

  • 作者单位

    University of Alberta (Canada).;

  • 授予单位 University of Alberta (Canada).;
  • 学科 Geochemistry.;Geology.
  • 学位 Ph.D.
  • 年度 1999
  • 页码 208 p.
  • 总页数 208
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 老年病学;
  • 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