Geochemical characteristics of the Mamelles banded iron formations in Southwest Cameroon
The Mamelles iron ore deposit is located approximately 20 km southeast of the Kribi area at the north-western edge of the Congo Craton in southern Cameroon.The deposit comprises massive high-grade magnetite orebodies hosted by banded iron formations(BIFs)of the Nyong Complex.The BIFs in this deposit are associated with amphibolites and gneisses.Within the framework of detailed field investigation,we report whole-rock geo-chemical data of the BIFs to constrain their sources and depositional settings.Weak positive Eu anomalies(6Eu=2.14-3.55)indicate the contribution of high-temperature hydrothermal fluids to the Mamelles BIFs derived via submarine alteration of volcanics,with slightly detrital input.The absence of true Ce anomalies indicates that the BIFs were likely deposited in anoxic deep seawater.Deposition of the Mamelles BIF sequence occurred in volcanic arc or back-arc settings.
Congo CratonCameroonMamelles iron depositBIFgeochemistry
SOH TAMEHE Landry、GANNO Sylvestre、陈祖兴、ROSIèRE Carlos Alberto
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中国有色桂林矿产地质研究院有限公司,广西 桂林 541004
Department of Earth Sciences,University of Yaounde Ⅰ,812 Yaounde,Cameroon
中国科学院海洋研究所,山东 青岛 266071
Department of Geology,Universidade Federal de Minas Gerais,31270-901 Belo Horizonte,Minas Gerais,Brazil
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