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    李水平, 袁杨森, 司建涛, 荆鹏, 孙进, 张雷. 坦桑尼亚姆瓦莫拉金矿综合找矿模式[J]. 中国地质, 2016, 43(4): 1409-1419. DOI: 10.12029/gc20160424
    引用本文: 李水平, 袁杨森, 司建涛, 荆鹏, 孙进, 张雷. 坦桑尼亚姆瓦莫拉金矿综合找矿模式[J]. 中国地质, 2016, 43(4): 1409-1419. DOI: 10.12029/gc20160424
    LI Shui-ping, YUAN Yang-sen, SI Jian-tao, JING Peng, SUN Jin, ZHANG Lei. An integrated ore prospecting model for the Mwamola gold deposit, Tanzania[J]. GEOLOGY IN CHINA, 2016, 43(4): 1409-1419. DOI: 10.12029/gc20160424
    Citation: LI Shui-ping, YUAN Yang-sen, SI Jian-tao, JING Peng, SUN Jin, ZHANG Lei. An integrated ore prospecting model for the Mwamola gold deposit, Tanzania[J]. GEOLOGY IN CHINA, 2016, 43(4): 1409-1419. DOI: 10.12029/gc20160424

    坦桑尼亚姆瓦莫拉金矿综合找矿模式

    An integrated ore prospecting model for the Mwamola gold deposit, Tanzania

    • 摘要: 坦桑尼亚Mwamola金矿位于坦桑尼亚环维多利亚湖区域的太古宙卡哈马(Kahama)绿岩带,是典型的铁建造(BIF)型金矿,为一大型隐伏矿床,因此建立Mwamola金矿床综合找矿模式,对寻找同类型矿床具有重要意义。太古宙卡哈马绿岩带是坦桑尼亚重要的成矿带,已发现金矿床和矿点多处,Mwamola金矿是代表性矿床之一,矿体呈层状、似层状,受地层和剪切带双重控制,矿化作用局限于条带状铁建造地层和岩性单元。地面高精度磁测高强度负异常能有效地识别控矿地层-条带状含铁建造带或矿化带,激发极化测深显示的“低阻高极化”异常可对条带状含铁建造和金矿体进行空间定位。岩石地球化学测量表明矿体上Au、As、Sb具强富集特性,且Au与As、Sb具有明显的相关性。本文根据地质、地球物理和地球化学信息,建立了Mwamola金矿地质、物化探综合找矿模式,提出了一套有效的找矿方法组合,为该绿岩带铁建造型金矿的勘查和评价提供指导。

       

      Abstract: Located along Kahama Archean greenstone belt around Victoria Lake area in Tanzania, the Mwamola gold deposit is a concealed large iron formation (BIF) type gold deposit closely related to the banded iron formation. The establishment of an oreprospecting model is very important in the search for the same type of deposits. The Mwamola gold deposit is the representative one among many gold deposits in the Archean Kahama greenstone belt of Tanzania. Orebodies are commonly stratiform and stratoid in form, controlled jointly by shear zone and strata, and mineralization is confined to the banded iron formation stratigraphic and lithologic units. The△T negative anomalies of ground high-precision magnetic survey can be used as a geophysical prospecting indicator because they can accurately identify ore-controlling strata (banded iron formation) or ore-bearing faults. The induced polarization depth measurement shows that "low resistance and high polarization" anomaly characteristics can serve as an indicator for the spatial orientation of the banded iron formation and gold orebody. The rock geochemical survey shows that Au, As, Sb have the feature of strong enrichment, and Au and As, Sb have significant correlation. Combined with geological, geophysical, geochemical prospecting information, the authors built a model of the Mwamola gold deposit, and establiehed a set of optimum combination prospecting methods and processes. The results obtained by the authors can play a certain guiding role in the exploration and evaluation of the greenstone belt banded iron form (BIF) type gold deposits.

       

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