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首页> 外文学位 >Hydrothermal Iron-Carbonate Alteration Associated with Volcanogenic Massive Sulfide (VMS) Deposits in Cycle IV of the Noranda Mining Camp, Rouyn-Noranda, Quebec.
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Hydrothermal Iron-Carbonate Alteration Associated with Volcanogenic Massive Sulfide (VMS) Deposits in Cycle IV of the Noranda Mining Camp, Rouyn-Noranda, Quebec.

机译：魁北克鲁昂-诺兰达的Noranda采矿营地IV循环中的热液状碳酸铁蚀变与火山成团的大规模硫化物（VMS）矿床。

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摘要

Massive sulfide deposits in the Noranda mining camp, northwestern Québec, are mainly associated with extensive footwall alteration defined by intense chloritization and sericitization. However, Fe-carbonate alteration also occurs in proximity to some deposits. To test the exploration significance of carbonate alteration in the camp, two areas of intense carbonate alteration were examined, around the small Delbridge deposit and near the new Pinkos occurrence in the Cyprus Rhyolite. Between 1969 and 1971, the Delbridge deposit produced 370,000 t of ore grading 9.6% Zn, 0.61% Cu, 110 g/t Ag, and 2.1 g/t Au. Recent drilling at the new Pinkos occurrence intersected 2.64 m of massive to semi-massive sulfides grading 8.1% Zn and 18.2 g/t Ag. Alteration mapping has shown that the distribution of Fe-carbonates can be used to identify vertically extensive zones of hydrothermal upflow at both properties. At Delbridge, intense Fe-carbonate alteration in brecciated rhyolite defines a pipe-like upflow zone that extends vertically for up to 300 m within the stratigraphic footwall of the massive sulfides and 100 m into the hanging wall. The location of known massive sulfide mineralization coincides with the intersection of the alteration pipe and a favorable horizon marked by the occurrence of fine-grained volcaniclastic rocks. At Pinkos, a similar zone of Fe-carbonate alteration occurs in outcrops of coherent rhyolite. Fe-carbonate alteration is most intensely developed along polygonal cooling fractures in massive rhyolite and decreases in intensity towards the centers of the columns. Fe-carbonate stringers and locally abundant matrix carbonate occur in fragmental rocks at the stratigraphic top of the coherent rhyolite flows and are most intense at the location of sulfide-bearing outcrops that mark the known mineralized horizon.;Whereas Fe-carbonate alteration defines the central part of the hydrothermal upflow zones at both properties, disseminated pyrite occurs at the margins and is widespread outside the main upflow zones. This may indicate that Fe-carbonate in the main upflow zones formed at the expense of earlier disseminated sulfides. Replacement of pyrite by synvolcanic Fe-carbonate alteration at Delbridge and Pinkos can probably be attributed to a relatively high concentration of dissolved CO2, possibly of magmatic origin, in the main-stage ore-forming fluids.
机译：魁北克西北部诺兰达采矿营地中大量的硫化物矿床，主要与剧烈的氯化作用和绢云母化作用引起的大规模下盘蚀变化有关。但是，碳酸盐铁的蚀变也发生在某些矿床附近。为了测试营地中碳酸盐岩蚀变的勘探意义，研究了两个剧烈的碳酸盐岩蚀变区，分别在小德尔布里奇矿床附近和塞浦路斯流纹岩中新的Pinkos矿床附近。在1969年至1971年之间​​，德尔布里奇矿床生产了370,000吨矿石，品位为9.6％锌，0.61％铜，110克/吨银和2.1克/吨金。最近在新的Pinkos矿山进行​​的钻探发现了2.64 m的块状至半块状硫化物，锌含量为8.1％，Ag含量为18.2 g / t。蚀变图表明，铁碳酸盐的分布可用于识别两种性质的热液上流的垂直扩展区域。在德尔布里奇（Delbridge），角砾岩流纹岩中强烈的铁碳酸盐蚀变定义了一个管状的上流区，该区在块状硫化物的地层下盘壁内垂直延伸达300 m，并向悬壁延伸100 m。已知块状硫化物矿化的位置与蚀变管的交点和以细粒火山碎屑岩的出现为标志的有利地层相吻合。在Pinkos，相干流纹岩的露头出现了类似的碳酸盐碳酸盐蚀变带。块状流纹岩中的多边形冷却裂缝中，铁碳酸盐蚀变最为强烈，并且向柱中心的强度降低。碳铁纵梁和局部富集的碳酸盐碳酸盐存在于相干流纹岩流地层顶部的碎屑岩中，并且在标志着已知矿化层的含硫化物露头的位置最为强烈；而铁碳酸盐蚀变则定义了中心在这两个性质的热液上流区的一部分，散布的黄铁矿出现在边缘，并在主要上流区外广泛分布。这可能表明，在主要的上流带中形成了碳酸铁盐，其代价是较早地散布了硫化物。在德尔布里奇和平科斯，通过火山岩-碳酸铁蚀变替代黄铁矿，可能归因于成矿流体主要阶段中溶解的CO2浓度较高，可能是岩浆成因。

著录项

  • 作者

    Wilson, Ryan.;

  • 作者单位

    University of Ottawa (Canada).;

  • 授予单位 University of Ottawa (Canada).;
  • 学科 Geochemistry.
  • 学位 M.Sc.
  • 年度 2012
  • 页码 329 p.
  • 总页数 329
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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