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首页> 外文期刊>Journal of African Earth Sciences >Application of lithogeochemistry to exploration for Ni-Cu sulfide deposits in the Kabanga area, NW Tanzania
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Application of lithogeochemistry to exploration for Ni-Cu sulfide deposits in the Kabanga area, NW Tanzania

机译：岩石地球化学在坦桑尼亚西北部卡班加地区镍-铜硫化物矿床勘探中的应用

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The Kabanga Ni-Cu sulfide deposits and the Luhuma Ni-Cu sulfide prospect are located in NW Tanzania roughly 200 km SW of Lake Victoria. Both areas are within the Meso-Proterozoic Karagwe-Ankolean tectonic domain, which consists of medium grade metasedimentary rocks, that are intruded by mafic to ultramafic intrusions, late syn- and post-orogenic granites. The two Ni-Cu sulfide deposits found in the Kabanga area are Kabanga Main and Kabanga North deposits; both of these deposits are associated with ultramafic rocks. The ore zones are classified into (1) those located within ultramafic rocks, (2) those detached from ultramafic rocks and located within metasedimentary rocks and (3) those located at the contact between ultramafic rocks and metasedimentary rocks. This paper focuses on the identification of element ratios (or lithogeochemical vectors) which could be used for target generation and prediction of mineralized zone(s) from the surface in order to avoid missing of ore targets due to complexities of leaching and trace element mobilization in soils. To do this, drill cores from Kabanga North and from Kabanga Main Ni-Cu sulfide ores were sampled. Core samples from the drill holes were selected in such a way that, at least each ore interval and associated lithologic units (ultramafic/metasedimentary rocks) were well represented. Core sampling was also undertaken in the Luhuma prospect. Soil sample lines were established in proximity of the sampled drill cores from Kabanga ore deposits and Luhuma prospect. Soil samples were taken and analyzed for trace elements. The most useful element ratios are (Pd/V) x 1000 and [(Pd/V)/(Cu/Cr)] × 100; V, Cr and Cu are in ppm and Pd is in ppb. These ratios were derived based on element variations in detached and contact ores. The results were corroborated by the Principal Component analytical data, which groups elements into clusters reflecting their host minerals, e.g. (1) Cr, V and Mo for oxides, (2) Ni, Cu and Pb for sulfides, etc.
机译：Kabanga镍-铜硫化物矿床和Luhuma镍-铜硫化物矿床位于坦桑尼亚西北部维多利亚湖西南约200公里处。这两个地区都在中元古代的卡拉格威-安科林构造域内，由中等品位的准沉积岩组成，这些基岩由镁铁质侵入到超镁铁质侵入体，晚同生和造山后花岗岩。在卡班加地区发现的两个镍铜硫化物矿床是卡班加主矿和卡班加北矿。这两个矿床都与超镁铁质岩石有关。矿带分为（1）位于超镁铁质岩内，（2）与超镁铁质岩分离，位于准沉积岩内和（3）位于超镁铁质岩与准沉积岩之间的接触区。本文着重于识别元素比率（或岩性化学载体），这些比率可用于目标生成和从地表预测矿化带，以避免因淋洗和微量元素动员的复杂性而丢失矿石目标。土壤。为此，对来自Kabanga North和Kabanga Main Ni-Cu硫化铜矿石的岩心进行了采样。选择钻孔中的岩心样品，使得至少每个矿石间隔和相关的岩性单元（超音速/沉积岩）都能得到很好的表示。 Luhuma勘探区也进行了岩心取样。在Kabanga矿床和Luhuma矿床的采样钻芯附近建立了土壤采样线。采集土壤样品并分析其微量元素。最有用的元素比率是（Pd / V）x 1000和[（Pd / V）/（Cu / Cr）]×100； V，Cr和Cu以ppm为单位，Pd以ppb为单位。这些比率是根据分离矿石和接触矿石中元素的变化得出的。主成分分析数据证实了该结果，该数据将元素分组为反映其宿主矿物（例如矿物）的簇。 （1）氧化物的Cr，V和Mo，（2）硫化物的Ni，Cu和Pb等。

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