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Petrogenesis of the Mayo-Darley tin formations,anorogenic complex of the Cameroon Line:implication for tin deposit

Acta Geochimica 2023年第4期42卷 704-725页

作者： ndema mbongué jean lavenir Ndongfong Edson Fuh Emmanuel Eseya Mengu Junior Department of Geology Faculty of SciencesUniversity of BueaP.O.Box 63BueaCameroon Department of Earth Sciences Faculty of SciencesUniversity of Yaounde IP.O.Box 812YaoundéCameroon

The Mayo-Darley massif is an anorogenic complex of the Cameroon Line that has a mantle ***-bearing rocks were analyzed by ICP-AES and INAA analytical *** purpose of this work was to provide new geochemical data for the Mayo-Darley tin formation and to understand its petrogenesis and the origin of tin *** Mayo-Darley tin deposit is made up of tin-granite,and tin-greisen,greisenification was developed on the borders of quartz *** rocks belong to the alkaline series and were classified into acid(SiO2-=61.6%–73.8%;65.4%–98%respectively)and basic(42.9%–47%SiO_(2))*** showed enrichment in HSFE,LILE,Ga/Al and chondrite normalized REE patterns indicating LREE enrichment relative to HREE with a negative Eu anomaly,only sample SB8 of tin-granite showed Eu/Eu*=*** display metaluminous,peralkaline,peraluminous,ferroan,high-K calc-alkaline to shoshonitic,alkalic to calcic affinity,and crystallized at800°*** chemistry of this deposit reflects the primary composition of granite,quartz monzonite,gabbro,and foid *** complex experienced multi-stage sub-solidus hydrothermal fluid reactions and shows variable alteration of feldspars alkali *** rocks are classified as A1-type granite,overlap with the OIB field,and were derived from a within-plate setting,similar to mantle non plumederived *** origin of tin mineralization in MayoDarley has a complex evolution,tin mineralization was derived from hydrothermal and hydrogenous metal-rich deposits and shows Sn–Hf–Zr and Sn–Tl–Nb *** new data confirm the complexity of the Mayo-Darley tin complex and elucidate the origin of tin mineralization.

关键词： Mayo-Darley Massif Cameroon Line Tingranite Tin-bearing greisen A1-type granite Sn–Hf–Zr Sn–Tl–Nb

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Geochemical constraints on the origin and tectonic setting of the serpentinized peridotites from the Paleoproterozoic Nyong series,Eseka area,SW Cameroon

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Acta Geochimica 2020年第3期39卷 404-422页

作者： Philomene Nga Essomba Tsoungui Sylvestre Ganno Evine Laure Tanko Njiosseu jean lavenir ndema mbongue Brice Kamguia Woguia Landry Soh Tamehe Jonas Didero Takodjou Wambo jean Paul Nzenti Department of Earth Sciences University of Yaounde IP.O.Box 3412MessaYaoundeCameroon Department of Earth Sciences University of DschangP.O.Box.67DschangCameroon Key Laboratory of CBM Resources and Reservoir Formation Process Chinese Ministry of EducationChina University of Mining and TechnologyXuzhou 221116JiangsuChina

Serpentinized rocks closely associated with Paleoproterozoic eclogitic metabasites were recently discovered at Eseka area in the northwestern edge of the Congo craton in southern ***,we present new field data,petrography,and first comprehensible wholerock geochemistry data and discuss the protolith and tectonic significance of these serpentinites in the *** studied rock samples are characterized by pseudomorphic textures,including mesh microstructure formed by serpentine intergrowths with cores of olivine,bastites after *** constitutes almost the whole bulk of the rocks and is associated(to the less amount)with tremolite,talc,spinel,and ***-rock chemistry of the Eseka serpentinites led to the distinction of two *** 1 has high MgO(>40 wt%)content and high Mg#values(88.80)whereas Type 2 serpentinite samples display relatively low MgO concentration and Mg#values(50 ppm).This similarity,associated with the high Cr contents,spinel-peridotite protolith compositions and Mg/Si and Al/Si ratios imply that the studied serpentinites were formed in a subductionrelated *** U-shaped chondrite normalizedREE patterns of serpentinized peridotites,coupled with similar enrichments in LREE and HFSE,suggest the refertilized nature due to melt/rock interaction prior to *** on the results,we suggest that the Eseka serpentinized peridotites are mantle residues that suffered a high degree of partial melting in a subductionrelated environment,especially in Supra Subduction Zone *** new findings suggest that the Nyong series in Cameroon rep

关键词： Serpentinites Mantle peridotites Melt/rock interaction Paleoproterozoic suture zone Eseka area Nyong series Congo/Sao Francisco cratons

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