Tectonic evolution of Neoproterozoic rocks, eastern Cameroon: Implication for gold mineralization in the Bétaré Oya and Woumbou–Colomine–Kette districts

Ndonfack, Kevin Igor Azeuda; Xie, Yuling; Zhong, Richen; Yomeun, Bovari Syprien; Cui, Kai; Shan, Xiaoyu

doi:10.1016/j.precamres.2021.106475

Cited by 17 publications

(3 citation statements)

References 73 publications

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“…Magmatic-hydrothermal fluids enriched in isotopically heavy boron probably dominated the formation of tourmaline [75]. Although the possibility of an external boron-enriched fluid leached from the widespread metamorphic basement rock may not be totally ruled out [52,56] as inferred from the sulfur isotope data in the area, our B isotope data points firmly to a dominant granite derived ore-bearing fluid. Hydrothermal tourmaline can therefore be used as a suitable exploration tool for primary orogenic gold deposits.…”

Section: The Tourmaline-primary Gold Link and Ore-forming Fluidmentioning

confidence: 59%

“…655 and 585 Ma, implying that the metavolcanic-metasedimentary rocks of the belt were deposited prior to 655 Ma, then metamorphosed and deformed between ca. 655 and 585 Ma [56]. This event equally resulted in the development of a low-pressure garnet-andalusite-staurolite regional metamorphic mineral assemblage (greenschist-facies) [46].…”

Section: Local Geology Of the Lom Basinmentioning

confidence: 99%

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Tourmaline occurrence and gold mineralization at a granitoid-metasediment contact in the Upper Lom Basin, east Cameroon

et al. 2023

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Gold mineralization of the Upper Lom Basin in the eastern Cameroon goldfield is spatially associated with tourmaline. The goldfield belongs to the Adamawa-Yadé Domain of the Central African Fold Belt and is characterized by eluvial, alluvial and lode gold deposits of Pan-African age. This paper examines the chemistry and morphology of saprock gold and its link with tourmaline in the host rock. Tourmaline chemistry was obtained using the electron microprobe analysis (EMPA) technique while gold grains were examined for morphology and microchemistry using the EMPA equipped with scanning electron microscopy and energy dispersive spectrum instruments. The tourmaline compositional data plot in the dravite field, and belongs to the alkali group showing major element variations that are typical of tourmaline associated with granite-related orogenic gold deposits common along shear zones. Gold alloy composition (Ag, Cu) suggests multiple gold precipitation events due to episodic fluid influx, with a range of 572–1000 gold fineness. We infer that tourmaline development and gold deposition were coeval within the aureole around the pluton and involved reduced hydrothermal fluids with low salinity. The high δ11B in the tourmaline also points to fluid derivation from the Pan African granitic basement widely recognized to be fertile in gold in eastern Cameroon. Tourmaline textural-chemical features such as low Na content and gold microchemistry point to granite-related hydrothermal style of primary gold mineralization, and has implications for exploration as tourmaline-rich rocks in the vicinity of the felsic plutons in the Lom Basin would be optimal target areas for future exploration.

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Section: The Tourmaline-primary Gold Link and Ore-forming Fluidmentioning

confidence: 59%

Section: Local Geology Of the Lom Basinmentioning

confidence: 99%

Tourmaline occurrence and gold mineralization at a granitoid-metasediment contact in the Upper Lom Basin, east Cameroon

et al. 2023

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“…The gold grades within the granite alteration halo vary from 2 ppm to 103 ppm [8,9,13,14,35,36]. The granites are subduction-related and 640-620 Ma old [10], similar to those farther afield in the AYD [30,31,34,35,37] and southern Chad [38]. This class of granite-related gold deposits contributes to about 32% of the world's gold reserve [39][40][41][42][43].…”

Section: Regional and Local Geologymentioning

confidence: 99%

Soil Geochemistry Combined with Particulate Gold Microchemistry Provides Evidence of Eluvial Gold Genesis and Anthropogenic Hg Use in Eastern Cameroon Goldfields

Vishiti,

Suh,

Ngatcha

et al. 2024

Minerals

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The identification of trace element anomalies in soils has been proven to assist semi-mechanized small-scale gold operations. This study employs soil geochemistry combined with the microchemical signature of particulate gold from the Batouri goldfield to (1) vector possible gold-endowed lithologies introducing particulate gold into the overlying regolith, and (2) assess anthropogenic Hg used in purification of both primary and alluvial/eluvial gold by artisans. The soil geochemistry shows irregularly distributed anomalies of elevated Cu especially in the saprolite soil layer. Whereas in the lateritic soil layer, a Au-Ag-Hg metal association is reported for the first time in this gold district and could be linked to anthropogenic Hg used in gold recovery. Particulate gold recovered from the soil varies in shape from euhedral and irregular to sub-rounded, indicating a proximal lode source. The gold grains range in size from nano-particles to >300 µm and are Au-Ag alloys. The gold particles reveal inclusions such as quartz, silicate, zircon and ilmenite suggesting that the grains were dislodged from quartz veins within the granitic basement. Systematic variation in the microchemical signature of the gold grains is suggestive of spatial and temporal evolution of the mineralizing fluid. These results are consistent with investigations from similar geologic settings worldwide and validate the combined utility of gold fingerprinting and pathfinder elements in soil to examine deposit genesis in other gold districts globally.

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Mapping Gold Mineralization Targets Using Geological Field and Magnetic Ground Data in the Yopa Area, Adamawa-Cameroon

Maurice

Meying

Moustapha

et al. 2023

Pure Appl. Geophys.

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Tectonic evolution of Neoproterozoic rocks, eastern Cameroon: Implication for gold mineralization in the Bétaré Oya and Woumbou–Colomine–Kette districts

Cited by 17 publications

References 73 publications

Tourmaline occurrence and gold mineralization at a granitoid-metasediment contact in the Upper Lom Basin, east Cameroon

Tourmaline occurrence and gold mineralization at a granitoid-metasediment contact in the Upper Lom Basin, east Cameroon

Soil Geochemistry Combined with Particulate Gold Microchemistry Provides Evidence of Eluvial Gold Genesis and Anthropogenic Hg Use in Eastern Cameroon Goldfields

Mapping Gold Mineralization Targets Using Geological Field and Magnetic Ground Data in the Yopa Area, Adamawa-Cameroon

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