Somie-Ntem area of the Tikar plain belongs to the western Cameroon Domain.The lithology of the plain has been characterized,and the mineral potential is still unclear despite previous reports on Sn deposit within one of the magmatic complexes.Our results show two groups of granitic rocks displaying oxidized and reduced charac-ter;(1)mesocratic(oxidized)granites including biotite-bearing,hornblende-biotite-bearing,hornblende-epidote-bearing and pyroxene-bearing;(2)leucogranites(reduced)that are generally amphibole-pyroxene bearing.These granitoids are hosted by gneisses and metasedimentary rocks partially covered by rhyolites.Major element com-position shows high-K calc-alkaline to shoshonite affinity,metaluminous to weakly peraluminous Ⅰ-type granites.Mesocratic granites show moderately negative Eu anom-aly,depleted in Nb,P,Ti,and are related to syn-collisional setting.Leucogranites are post-orogenic with strong neg-ative Eu anomaly,depleted in Ba and Sr and enriched in Hf,Nb and Ta.They are fertile in Sn and Zn,enriched through postmagmatic metasomatism and greisenization.Cr-Cu-Ni-V mineralization occurs in hornblende-bearing gneisses and their enrichment suggests a possible Ni-Cu-type PGEs mineralization in this area.Meanwhile,their trace element shows high Ni/Cu,very low Rb/Sr,low LILE and LREE which indicates mantle fractionation at sub-duction.The absence of olivine and pyroxene,and increased SiO2 and Al2O3 in the Cr-Cu-Ni-V-bearing rocks show that the parent magma experienced fractional crystallization and crustal contamination during evolution.Notwithstanding,the high Zr/Rb and K/Rb ratios show that hydrothermal activity was not intense to enhance miner-alization in the area.Variation in the direction of stress during shear deformation inhibited an effective hydrothermal activity and ore deposition in the region.

Mero Yannah;Yaya Fodoué;Maurice Kwékam;Benoit Joseph Mbassa;Juliana Amboh Tifang;Armand Dongmo Kagou;Samuel Ndonwi Ayonghe

Institute of Geological and Mining Research,Yaounde,Cameroon;Department of Earth Sciences,University of Dschang,Dschang,Cameroon;Central Unit for Internal Control and Evaluation,University of Buea,Buea,Cameroon

地球化学学报（英文版）

[1]Mero Yannah;Yaya Fodoué;Maurice Kwékam;Benoit Joseph Mbassa;Juliana Amboh Tifang;Armand Dongmo Kagou;Samuel Ndonwi Ayonghe-.Geochemical evaluation of mineralization potential of the Somie-Ntem area within the Tikar plain,Cameroon:implication on petrogenesis)[J].地球化学学报（英文版）,2022(05):861-886

Somie,Ntem,Tikar,mesocratic,rhyolites,shoshonite,Mesocratic,Leucogranites,postmagmatic,greisenization

Geochemical,evaluation,mineralization,potential,area,within,plain,Cameroon,implication,petrogenesis,belongs,western,Domain,lithology,has,been,characterized,still,unclear,despite,previous,reports,Sn,one,complexes,Our,results,two,groups,granitic,rocks,displaying,oxidized,reduced,including,biotite,bearing,hornblende,epidote,pyroxene,leucogranites,that,generally,amphibole,These,granitoids,hosted,by,gneisses,metasedimentary,partially,covered,Major,element,shows,high,calc,alkaline,affinity,metaluminous,weakly,peraluminous,type,moderately,negative,Eu,depleted,Nb,related,syn,collisional,setting,orogenic,strong,anomaly,Ba,Sr,enriched,Hf,Ta,They,fertile,through,metasomatism,occurs,their,enrichment,suggests,possible,PGEs,this,Meanwhile,trace,very,low,Rb,LILE,LREE,which,indicates,mantle,fractionation,sub,duction,absence,olivine,increased,SiO2,Al2O3,parent,experienced,fractional,crystallization,crustal,contamination,during,evolution,Notwithstanding,Zr,ratios,hydrothermal,activity,was,not,intense,enhance,Variation,direction,stress,shear,deformation,inhibited,effective,ore,deposition,region

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