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Petrographic and geochemical characterization of weathered materials developed on BIF from the Mamelles iron ore deposit in the Nyong unit, South-West Cameroon

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Acta Geochimica 2021年第2期40卷 163-175页

作者： Tessontsap Teutsong Jean Pierre Temga Armelle Ayissi Enyegue Nicodeme Noel Feuwo Dieudonne Bitom Department of Earth Sciences University of Yaounde IP.O.Box 812YaoundeCameroon Ministry of Mines Industry and Technological DevelopmentYaoundeCameroon University of Dschang P.O.Box 96Dschang.Cameroon

Iron ore deposits hosted by Precambrian banded iron formation(BIF)are the most important source of mineable *** Cameroon,they are located in the southern part of the *** study reports the petrological and geochemical data of iron ores collected from a weathering profile in the Mamelles BIF deposit,SW *** profile is composed of three levels which are from the bottom to the top:the saprock,the ferruginous horizon,and the loose *** representative iron ore samples(rock fragments and loose clayey material)were collected along the profile and were subjected to petrographic and geochemical *** mineralogy consists of martite,goethite,quartz,and lesser amounts of hematite,magnetite,kaolinite,and *** presence of minerals such as kaolinite and goethite in the Mamelles iron ores suggests their supergene ***,the saprock is characterized by high iron content(70.25 wt%Fe_(2)O_(3) t),and low silica(26.38 wt%SiO_(2))and alumina(1.14 wt%Al_(2) O_(3)).The rock fragments collected from the ferruginous horizon display higher Fe2 O3 t(72-76.40 wt%),Al_(2) O_(3)(2.80-5.43 wt%),and lower SiO_(2)(16.70-18.35 wt%)contents,suggesting the leaching of silica during the enrichment *** loose clayey samples collected from both the ferruginous horizon and the upper loose horizon show lower iron and higher silica *** normalized to the underlying BIF saprock,both rock fragments and loose clayey ores display LREE enrichment,suggesting that they formed through supergene ***,most of the Mamelles iron ores are classified as medium-grade ores and a few display acceptable contents in ***,this petrological and geochemical study of the Mamelles iron ores revealed encouraging *** its strategic location near the deep seaport,the deposit should be investigated in more detail for its mining potential.

关键词： Mamelles BIF Medium-grade iron ore supergene origin Nyong unit Cameroon

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