Geochemistry of S, Cu, Ni, Cr and Au-PGE in the garnet amphibolites from the Akom II area in the Archaean Congo Craton, Southern Cameroon

Aye, Beyanu Anehumbu; Sababa, Elisé; Ndjigui, Paul‐Désiré

doi:10.1016/j.chemer.2017.01.009

Cited by 20 publications

(12 citation statements)

References 53 publications

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“…In the Ntem complex, the indices having Fe-Au (Iron Oxides-Gold; IOG) affiliation are mainly found out of greenstones in TTG, granodiorites and granitoids; they tend to confirm the existence of porphyry and/or IOCG deposits, despite the absence of Cu index in the study area. [112] while confirming the Cu depletion in Akom II southwest of the study area, rather revealed a S, Ni, and Au-PGE enrichment. Regarding the geodynamical, Figure 10.…”

Section: Hydrothermal Alteration Mapping and Mining Implicationssupporting

confidence: 69%

+-Evidence of Porphyry Deposits in the Ntem Complex: A Case Study from Structural and Hydrothermal Alteration Zones Mapping through Landsat-8 OLI, Aeromagnetic and Geological Data Integration in the Yaounde-Sangmelima Region (Southern Cameroon)

Assembe¹,

Mbarga²,

Nyam³

et al. 2020

ARS

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A semi-regional study was carried out in the Yaounde-Sangmelima area, a densely vegetated tropical region of southern Cameroon located in the Central Africa Fold Belt (CAFB)/Congo Craton (CC) transition zone. Towards structural lineaments and predictive hydrothermal porphyry deposits mapping, an integrated analysis of Landsat-8 OLI data, aeromagnetic, geological and mineral indices maps was performed. The Remote sensing using False colour composite images involving bands combinations and Crosta method (features oriented principal components analysis) enabled the mapping of the gneisses and schists domains without a clear differentiation between the Yaounde and Mbalmayo schists; despite the reflectance anomalies evidenced NW of Akonolinga, hydrothermal alterations in the study area failed to be detected. Besides, aeromagnetics depicted a moderately fractured northern zone (the CAFB

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Section: Hydrothermal Alteration Mapping and Mining Implicationssupporting

confidence: 69%

+-Evidence of Porphyry Deposits in the Ntem Complex: A Case Study from Structural and Hydrothermal Alteration Zones Mapping through Landsat-8 OLI, Aeromagnetic and Geological Data Integration in the Yaounde-Sangmelima Region (Southern Cameroon)

Assembe¹,

Mbarga²,

Nyam³

et al. 2020

ARS

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“…It lies on the Congo Craton as an Eburnian formation (Toteu et al, 1994;Feybesse et al, 1998). This series is a reactivated portion of the Ntem complex in Cameroon which consists of a Meta-sedimentary rock unit (garnet-bearing mica schist, mica schist and schist), the Meta-igneous rock unit (pyroxene-rich gneiss, garnet-rich charnockitic gneiss, charnockitic gneiss, amphibolite biotite-rich gneiss, and garnet-rich amphibolite) and the syn-to late-tectonic syenites and granitoids (Pouclet et al, 2007;Mbongue et al, 2014;Ngo Bidjeck, 2004;Aye et al, 2017;Bouyo et al, 2019;Fuanya et al, 2019). The Nyong unit is characterized by a D1-D3 polyphasic deformation (Binam Mandeng et al, 2018;Kankeu et al, 2018).…”

Section: Geographical Setting Of the Abiete-toko Gold Districtmentioning

confidence: 99%

“…The Nyong Series, to which belongs the Abiete-Toko gold district, is a supercrustal formation that was emplaced during the Paleoproterozoic, metamorphosed at 2050 Ma during the Eburnean orogeny and later overprinted by Pan-African events (Lerouge et al, 2006;Ako et al, 2015;Moudioh et al, 2020). The Nyong series, affected by polyphasic deformation and dissected by the greenstone belt, consists of three rock units, which include: meta-sedimentary, meta-igneous and the syn-to late-tectonic granitoids and syenites (Aye et al, 2017;Binam Mandeng et al, 2018;Kankeu et al, 2018;Bouyo et al, 2019;Fuanya et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Gold deposit type and implication for exploration in the Abiete-Toko Gold District, South Cameroon: constraint from morphology and microchemistry of alluvial gold grains

Nono

Bongsiysi

Tamfuh

et al. 2021

Heliyon

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The morphology and quantitative chemical analyses of fifty alluvial gold grains from fourteen studied sites were used to constraint gold deposit type and its implications to exploration in the Abiete-Toko Gold District in South Cameroon. The main results revealed that the gold grains show a core-rim zonation marked by Ag depleted rims as a result of leaching during transportation. The fineness of grains ranges from 826 to 1000 and their composition is almost binary gold-silver. Gold fineness refers to the relative amounts of Ag and Au present, given as a number out of 1000 and defined by Au/(Ag þ Au)*1000. The chemical composition of the gold grains are range as thus: 83.40-100 wt.% Au, 0.07-17.45 wt.% Ag, 0-0.96 wt.% Cu, 0-0.01 wt.% As, 0-0.02 wt.% Ni, 0-0.02 wt.% Co, 0-0.01 wt.% Se, 0-0.08 wt.% Hg and 0.003-0.03 wt.% S. The high sulphur concentrations of the gold grains probably imply primary deposition of gold by sulphidation; The ranges of Ni and Co concentrations suggest an interaction with greenstones. Such findings indicate that the Abiete-Toko area hosts a mesothermal-orogenic gold deposit. Exploration operations must target fractures and contact zones between ironstones, felsic gneiss and greenstones. Soil sampling is not recommended in this orogenic gold district due to the very thick and transported nature of the weathering mantle. Detailed mapping coupled to geophysical surveys are the recommended key exploration methods prior to drilling program.

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“…The Ako'ozam-Njabilobe area (Fig. 1b) is characterized by gneisses intruded by amphibolites, and metadolerites [13,14]. Four deformation phases were observed within the area.…”

Section: Geological Settingmentioning

confidence: 99%

“…3 Average Akom II amphibolite [37] 4 Average Nyabitande amphibolite [38] 5 Average Ngovayang pyroxenite [38] 6 Eseka amphibolite […”

Section: Petrogenesismentioning

confidence: 99%

Geochemical characteristics and petrogenesis of basic rocks in the Ako’ozam–Njabilobe area, Southwestern Cameroon: implications for Au genesis

et al. 2019

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Greenstone belts are known to host important gold mineralization across the globe. Greenstone rocks outcrop within the gneissic basement of the Ako'ozam-Njabilobe area, in the Paleoproterozoic Nyong unit, Southwestern Cameroon, known to host significant placer gold mineralization. Major, trace and rare-earth elements of amphibolites and metadolerites in the Ako'ozam-Njabilobe area were examined to ascertain their petrogenesis and their role in gold mineralization. The rocks are of tholeiitic affinity, enriched in LILE and base metals notably Cu and Zn. The basic rocks were sourced from basalts and emplaced in continental settings. The low Rb/Sr ratio (0.08 to 0.13), high Ba/Rb and Nb/Ta ratios (8.04 to 10.0 and 7.27 to 11.557 respectively), suggest that the basaltic magma was sourced from the lithospheric mantle. The mineral inclusion chemistry (Fe-rich biotite, Fe-oxide, and rutile) of placer gold in the Ako'ozam-Njabilobe area suggests that the mineralizing fluids interacted with the mafic rocks in the area. It is suggested that a gold-bearing magmatic rock was metamorphosed into amphibolite and metadolerite with the subsequent partitioning of Fe-oxide, rutile and Fe-rich biotite in the gold grains during mobilization of gold from the basic rocks by hydrothermal fluids.

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Geochemistry of S, Cu, Ni, Cr and Au-PGE in the garnet amphibolites from the Akom II area in the Archaean Congo Craton, Southern Cameroon

Cited by 20 publications

References 53 publications

+-Evidence of Porphyry Deposits in the Ntem Complex: A Case Study from Structural and Hydrothermal Alteration Zones Mapping through Landsat-8 OLI, Aeromagnetic and Geological Data Integration in the Yaounde-Sangmelima Region (Southern Cameroon)

+-Evidence of Porphyry Deposits in the Ntem Complex: A Case Study from Structural and Hydrothermal Alteration Zones Mapping through Landsat-8 OLI, Aeromagnetic and Geological Data Integration in the Yaounde-Sangmelima Region (Southern Cameroon)

Gold deposit type and implication for exploration in the Abiete-Toko Gold District, South Cameroon: constraint from morphology and microchemistry of alluvial gold grains

Geochemical characteristics and petrogenesis of basic rocks in the Ako’ozam–Njabilobe area, Southwestern Cameroon: implications for Au genesis

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