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首页> 外文期刊>Journal of African Earth Sciences >Petrography and perovskite U-Pb age of the Katuba kimberlite, Kundelungu Plateau (D.R. Congo): Implications for regional tectonism and mineralisation
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Petrography and perovskite U-Pb age of the Katuba kimberlite, Kundelungu Plateau (D.R. Congo): Implications for regional tectonism and mineralisation

机译：昆德拉伦古高原（刚果民主共和国）卡图巴金伯利岩的岩相学和钙钛矿U-Pb年龄：对区域构造和成矿的影响

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摘要

The Kundelungu Plateau in the southeast of the Democratic Republic of the Congo (DRC) hosts numerous kimberlites, but up to now, only 34 bodies have been mapped. Locating these occurrences is hampered by the presence of sand cover on the plateau, a few tens of meters thick. Thus, most of the known pipes occur at the edge of the plateau where erosion has removed most of the sand cover. We report here on the Katuba kimberlite, a volcaniclastic kimberlite typical of a diatreme environment, with xenoliths of peridotite, carbonate, sandstone and shale, and lapilli-like microstructures. U-Pb analysis of perovskites from the Katuba kimberlite provides an age of 23 +/- 1.8 Ma for the intrusion. Considering the age of 33 +/- 4 Ma for perovskites from the Msipashi kimberlite pipe (also located on the same plateau), this new age suggests that the kimberlite magmatism in the Kundelungu Plateau lasted at least for 10 myr. The emplacement of these kimberlites is coeval with the opening of the Mweru graben, which is part of the East African Rift System (EARS), with structures oriented generally NW-SE and NE-SW. Some copper mineralisations inside the Katanga copperbelt, including those at Dikulushi and Kipushi, are located in similar structures, suggesting that the fluids responsible for the remobilisation of the mineralisation may be related to the kimberlite magmatism. Alternatively, the trigger for both the remobilisation of the mineralisation and the kimberlite magmatism is the tectonism that lead to the opening of the EARS. The upwelling of the asthenosphere or the mantle plume associated with the kimberlite magmatism may have supplied sufficient heat for fluid generation or contributed to the remobilisation of fluids. The location of the Katuba kimberlite along the NW-SE structures that were reactivated during the rifting inducing the opening of the Mweru graben, and which themselves are crosscut by the Luizi impact structure, provides another constraint on the relative age of the Luizi structure, which must be younger than the NW-SE structures and older than the emplacement of the Katuba kimberlite.
机译：刚果民主共和国（DRC）东南部的昆德拉伦古高原（Kundelungu Plateau）拥有大量金伯利岩，但到目前为止，仅绘制了34具尸体。高原上几十米厚的沙层阻碍了这些事件的定位。因此，大多数已知的管道出现在高原的边缘，那里的侵蚀已消除了大部分的沙层。我们在这里报告卡图巴金伯利岩，这是一种在极端环境下典型的火山碎屑金伯利岩，具有橄榄岩，碳酸盐，砂岩和页岩的异质岩，以及类似lapilli的微结构。卡图巴金伯利岩中钙钛矿的U-Pb分析显示侵入年龄为23 +/- 1.8 Ma。考虑到Msipashi金伯利岩管（也位于同一高原）中钙钛矿的年龄为33 +/- 4 Ma，这个新纪元表明，昆德伦古高原的金伯利岩岩浆作用至少持续了10迈尔。这些金伯利岩的位置与东非大裂谷系统（EARS）的一部分Mweru抓斗的开放同时发生，其构造通常面向NW-SE和NE-SW。加丹加铜矿带内的一些铜矿化，包括在迪库鲁什和基普什的铜矿化，都位于相似的结构中，这表明负责矿化迁移的流体可能与金伯利岩岩浆作用有关。或者，动员矿化和金伯利岩岩浆作用的触发因素是导致EARS开放的构造运动。与金伯利岩岩浆作用相关的软流圈或地幔柱上升流可能已经为生成流体提供了足够的热量，或者有助于流体的流动。卡图巴金伯利岩沿NW-SE结构的位置在裂谷过程中被重新激活，从而导致Mweru en片的打开，而它们本身被Luizi冲击结构横切，这对Luizi结构的相对年龄提供了另一个限制，即必须比NW-SE结构要年轻，并且比Katuba金伯利岩的定位要老。

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  • 来源
    《Journal of African Earth Sciences》 |2019年第8期|35-43|共9页
  • 作者

    Batumike Jacques M.; Belousova Elena; Griffin William L.; Lubala Toto R. F.; Chabu Mumba; Kaseti Pierre K.; Djuma Byadunia A.; Ferriere Ludovic;

  • 作者单位

    Macquarie Univ, ARC Ctr Excellence Core Crust Fluid Syst CCFS, N Ryde, NSW 2109, Australia|Macquarie Univ, GEMOC, Dept Earth & Planetary Sci, N Ryde, NSW 2109, Australia|Univ Officielle Bukavu, Dept Geol, Fac Sci & Sci Appl, Karhale, Bukavu, DEM REP CONGO;

    Macquarie Univ, ARC Ctr Excellence Core Crust Fluid Syst CCFS, N Ryde, NSW 2109, Australia|Macquarie Univ, GEMOC, Dept Earth & Planetary Sci, N Ryde, NSW 2109, Australia;

    Macquarie Univ, ARC Ctr Excellence Core Crust Fluid Syst CCFS, N Ryde, NSW 2109, Australia|Macquarie Univ, GEMOC, Dept Earth & Planetary Sci, N Ryde, NSW 2109, Australia;

    Univ Lubumbashi, Dept Geol, Route Kasapa, Lubumbashi, Haut Katanga, DEM REP CONGO;

    Univ Lubumbashi, Dept Geol, Route Kasapa, Lubumbashi, Haut Katanga, DEM REP CONGO;

    Univ Lubumbashi, Dept Geol, Route Kasapa, Lubumbashi, Haut Katanga, DEM REP CONGO;

    Univ Lubumbashi, Dept Geol, Route Kasapa, Lubumbashi, Haut Katanga, DEM REP CONGO;

    Nat Hist Museum, Burgring 7, A-1010 Vienna, Austria;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    Kundelungu Plateau; Kimberlites; U-Pb dating; Perovskite; East African rift system; Katanga copperbelt;

    机译：昆德伦古高原;金伯利岩岩;U-Pb年代;钙钛矿;东非裂谷系统;加丹加铜带;

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