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首页> 外文学位 >Geology and paragenesis of the Boseto Copper Deposits, Kalahari Copperbelt, Northwest Botswana.
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Geology and paragenesis of the Boseto Copper Deposits, Kalahari Copperbelt, Northwest Botswana.

机译：博茨瓦纳西北部卡拉哈里铜矿带Boseto铜矿床的地质和共生作用。

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摘要

Detailed lithostratigraphic, structural, and petrographic studies coupled with fluid inclusion and stable isotopic analyses and geochronological studies indicate that the Boseto copper deposits formed initially during diagenesis as metalliferous brines ascended along basin faults and moved along a stratigraphic redox boundary between continental red beds and an overlying reduced marine siliciclastic sequence. The hanging wall rocks to copper-silver ore zones comprise comprises a series of at least three stacked coarsening upwards cycles deposited in a deltaic depositional setting. Early copper mineralization may have been accompanied by regionally extensive albitization. Later multiple pulses of faulting and hydrothermal fluid flow associated with a southeast-vergent folding event in the Ghanzi-Chobe belt resulted in extensive networks of bedding-parallel and discordant quartz-carbonate-(Cu-Fe-sulfide) veins. This contractional deformation-related vein and shear system was responsible for significant remobilization of pre-existing vertically and laterally zoned copper sulfide minerals into high-grade zones by hot (250-300°C), syn-orogenic, metamorphic-derived hydrothermal fluids.;Orientation analysis indicates that the mineralized veins probably formed in association with a flexural slip folding processes. Mineralized vein systems display intense carbonate-chlorite-Cu-Fe-sulfide replacement of wall rock slivers within veins and clasts within shear zones, potassic alteration of the surrounding wall rock, and significant remobilization of early diagenetic disseminated copper sulfide minerals. Sulfur isotopic analyses indicate copper sulfides were probably both mechanically and chemically remobilized.
机译：详细的岩石地层学，结构学和岩相学研究以及流体包裹体研究，稳定的同位素分析和地质年代学研究表明，成矿作用最初形成的Boseto铜矿床是含金属的盐水沿着盆地断层上升，并沿着大陆红层和上覆岩层之间的地层氧化还原边界移动。减少了海洋硅质碎屑层序。到铜-银矿带的悬挂壁岩石包括一系列至少三个堆叠的，沿三角洲沉积环境沉积的向上粗化循环。早期的铜矿化可能伴随着区域广泛的阿尔比特化。后来，与甘孜-乔布带东南偏折事件相关的断层和热液流体的多个脉冲导致了层状平行且不一致的石英-碳酸盐-（铜-铁-硫化物）脉网。这种与收缩变形有关的静脉和剪切系统负责通过高温（250-300°C），同造山带，变质衍生的热液将先前存在的垂直和横向分区的硫化铜矿物大量迁移到高等级区域。方向分析表明矿化的脉可能与弯曲滑动折叠过程有关。矿化矿脉系统显示出剪切带内的矿脉和碎屑中强烈的碳酸盐-亚氯酸盐-铜-铁-硫化物替代壁岩碎屑，周围壁岩的钾化蚀变以及早期成岩的弥散性硫化铜矿物的大量迁移。硫同位素分析表明，硫化铜可能同时进行了机械和化学固定。

著录项

  • 作者

    Hall, Wesley S.;

  • 作者单位

    Colorado School of Mines.;

  • 授予单位 Colorado School of Mines.;
  • 学科 Geology.
  • 学位 M.S.
  • 年度 2013
  • 页码 157 p.
  • 总页数 157
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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