Diachronous evolution of volcano-sedimentary basins north of the Congo craton: Insights from U–Pb ion microprobe dating of zircons from the Poli, Lom and Yaoundé Groups (Cameroon)

Toteu, S.F.; Pénaye, Joseph; Deloule, Étienne; Schmus, W. R. Van; Tchameni, Rigobert

doi:10.1016/j.jafrearsci.2005.11.011

Cited by 207 publications

(117 citation statements)

References 27 publications

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“…The RBGB is made of mafic to intermediate and felsic metavolcanic rocks; and by metasedimentary rocks all metamorphosed under low grade at 600 Ma [28,29]. The RBGB is actually considered as remnants of back arc basin [30,31] related to the TBSZ. The mylonitic hornblende-biotite gneiss of Mbé quarry which have been dated at 580 ± 11 Ma (U-Pb titanite age) was interpreted as dating the minimum age of sinistral deformation event in this area [25].…”

Section: Geological Settingmentioning

confidence: 99%

“…These rocks are dominantly migmatitic and transformed under high-pressure granulitic metamorphism dated at 600 Ma [39,40]; (b) Neoproterozoic metavolcano-sedimentary rocks belonging to the Lom series, and recrystallized under low-to medium-grade metamorphic conditions during the Pan-African orogeny [1,31,41]; and (c) syn-to late-orogenic, weakly deformed granites emplaced at ca. 600 Ma [42,43], showing calc-alkaline to shoshonitic affinity [18,19,37], and considered to be of crustal or mixed origin [41,43].…”

Section: Geological Settingmentioning

confidence: 99%

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Polyphase deformation in the Mbé - Sassa-Bersi area: Implications on the tectono-magmatic history of the area and the tectonic evolution of the Tcholliré-Banyo and Central Cameroon Shear Zones (Central North Cameroon)

Nicaise¹,

Tchameni²,

Emmanuel³

et al. 2018

JGG

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Section: Geological Settingmentioning

confidence: 99%

Section: Geological Settingmentioning

confidence: 99%

Polyphase deformation in the Mbé - Sassa-Bersi area: Implications on the tectono-magmatic history of the area and the tectonic evolution of the Tcholliré-Banyo and Central Cameroon Shear Zones (Central North Cameroon)

Nicaise¹,

Tchameni²,

Emmanuel³

et al. 2018

JGG

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“…In a geological context, the Lom Basin is a post-collisional basin dominated by younger volcaniclastic schists, metasedimentary rocks and ubiquitous S-type granitoids which intrude the Pan-African basement (Soba et al 1991;Toteu et al 2001Toteu et al , 2006Ngako et al 2003). The tectonic evolution of this pull-apart basin and hydrothermal alteration around the plutons account for the widespread sulphide-bearing quartz vein gold deposits (Toteu et al 2004).…”

Section: Study Areamentioning

confidence: 99%

Seasonal Hydrological Inputs of Major Ions and Trace Metal Composition in Streams Draining the Mineralized Lom Basin, East Cameroon: Basis for Environmental Studies

et al. 2017

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Purpose The aim of this study is to assess the seasonal variation in major ion distribution patterns and identify the origin and geochemical behavior of some trace metals of streamwaters bathing the mineralized Lom Basin. Methods Eighty-one water samples were collected during the dry and wet seasons and analyzed for major ions using AAS and 12 trace metals (Fe, Mn, V, Cr, Co, Ni, Cu, Zn, As, Cd, Pb, Hg) by ICP-MS. Results All physicochemical parameters besides pH and Cl -varied narrowly between both seasons. No seasonal variability was observed for Cl -given its conservative nature, while NO 3 -levels decreased in the wet period due to the dilution effect. Similarly, SO 4 2-concentrations were low for both seasons reflecting the dissolution of low sulphide minerals associated with gold deposits. In contrast, the concentration of Ca 2? , Mg 2? , Na ? , K ? and HCO 3 -slightly increased during the wet season as they are flushed from the soil layers by rain. Water samples had very low concentrations (\ 1 lg/l) of V, Cr, Co, Cu, Zn, Cd, Pb and significant concentrations of Fe and Mn.Conclusions The seasonal regime of streamwater chemistry is controlled by groundwater supply of major cations and HCO 3 -from chemical weathering, leaching of ions from surface soil layers during precipitation and dilution of nitrate by surface runoff during the wet season. In this tropical basin, low acidity and trace metal loadings revealed lateritic weathering of sulphides, entrapment of trace metals in Fe and Mn oxides and leaching into deep groundwater. Although the streams have not been impacted, these findings may guide policymakers for water chemistry evaluation in Cameroon.

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“…Northwards and beyond this unit the so-called "East Saharan Block" (ESB), almost entirely masked by the Chad basin, is located (Figure 1). The geology of the northern margin of the CAFB in Cameroon is known through the well exposed Poli Group that represents an early Neoproterozoic back-arc basin formed between 830 and 665 Ma ( [14][15][16].…”

Section: Regional Geologymentioning

confidence: 99%

Na-Metasomatism and Uranium Mineralization during a Two-Stage Albitization at Kitongo, Northern Cameroon: Structural and Geochemical Evidence

Kouske¹,

Suh²,

Ghogomu³

et al. 2012

IJG

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Mapping and documentation of lithological varieties and their corresponding geochemistry at the Kitongo uranium mineralization were concerned. The Kitongo U occurrence is hosted by granitic rocks that include interleaved sequences of metasedimentary and metavolcanic rocks of the collectively termed Poli Group. U-mineralization and Na-metasomatism are related and structurally controlled. The most promising uraniferous bodies are intimately related to intersecttions between the ductile ENE-trending faults and the brittle conjugate R' faults postdating the shearing event. The concentration of uranium at fault intersections rather than along individual faults suggests that these zones that are dilatational in nature were also highly permeable and therefore the hydrothermal fluids ponded there could readily precipitate U therein. A two-stage albitization has altered the foliated granitic host rock and the second albitization that has overprinted the first one is more effective at fault intersections. Whole rock geochemistry was performed by using ICP-MS and ICP-AES respectively for major oxides, trace and REE. The U-bearing rock suite exhibits restricted range in SiO 2 concentration (62.89% -70.91%) and Al 2 O 3 (13.16% -18.59%) and it is poor in MgO (0.02% -1.03%), CaO (0.24% -1.88%) and K 2 O (0.08% -5.32%). The mineralized rocks are however comparatively richer in Na 2 O (4.33% -10.92%) compared to their barren counterparts. The host granite and associated granodioritic rocks in the area are weakly metaluminous, peralkaline, and are calc-alkaline. They are moderately to strongly fractionated and have tholeiitic and shoshonitic affinities with moderate to high HFSE (high field strength elements) and LILE (large ion lithophile elements) enrichment. The Rb/Sr, Rb/Ba and Sr/Ba ratios are 0.31, 0.14 and 1.48, respectively. U content in the mineralized granite is up to 651 ppm while the non-mineralized rock has only 2.4 ppm U. The REE patterns of the granite show LREE enrichment and strong Eu negative anomalies (Eu/Eu* = 0.03 to 0.48). The main mineralization stage characterized by local U, Na, Pb, Zn, Ga, Hf, Sr, Fe, Al, P and Zr enrichments is related to the second albitization event and could probably be associated in time with the calcite-uranium stage. The identification of fault segments favorable for uranium mineralization in northern Cameroon (Poli area) is important for understanding the genesis of hydrothermal ore deposits within continental strike-slip faults and therefore has great implications for exploration strategies.

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Diachronous evolution of volcano-sedimentary basins north of the Congo craton: Insights from U–Pb ion microprobe dating of zircons from the Poli, Lom and Yaoundé Groups (Cameroon)

Cited by 207 publications

References 27 publications

Polyphase deformation in the Mbé - Sassa-Bersi area: Implications on the tectono-magmatic history of the area and the tectonic evolution of the Tcholliré-Banyo and Central Cameroon Shear Zones (Central North Cameroon)

Polyphase deformation in the Mbé - Sassa-Bersi area: Implications on the tectono-magmatic history of the area and the tectonic evolution of the Tcholliré-Banyo and Central Cameroon Shear Zones (Central North Cameroon)

Seasonal Hydrological Inputs of Major Ions and Trace Metal Composition in Streams Draining the Mineralized Lom Basin, East Cameroon: Basis for Environmental Studies

Na-Metasomatism and Uranium Mineralization during a Two-Stage Albitization at Kitongo, Northern Cameroon: Structural and Geochemical Evidence

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