Zircon chemistry and new laser ablation U–Pb ages for uraniferous granitoids in SW Cameroon

Embui, Victor Fonabe; Suh, Cheo Emmanuel; Cottle, John M.; Étamé, Jacques; Mendes, Júlio Cézar; Agyingi, Christopher M.; Vishiti, Akumbom; Shemang, Elisha; Lehmann, Bernd

doi:10.1007/s11631-019-00337-x

Cited by 8 publications

(20 citation statements)

References 89 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…With the exception of Ce, the concentrations of REEs in zircon grains from Kambélé increase from La to Lu which is concurrent with other plutons within the AYD (Mosoh Bambi et al, 2013;Ateh et al, 2017). Total REEs of the zircon grains that range from 75.1-679.4 ppm (average 355.9 ppm) is consistent with abundances for these same REEs measured in zircon grains from other mineral deposit-related granitoids within the CAFB in Cameroon (Mosoh Bambi et al, 2013;Ateh et al, 2017;Embui et al, 2019). These patterns derived from the normalised values which are consistent with zircon grains from other portions of the CAFB and most especially the AYD (Ateh et al, 2017) can therefore be used as a guide for further planning during mineral exploration ventures.…”

Section: Zircon Grainssupporting

confidence: 70%

“…The absence of inclusions such as garnet and kyanite which are indicative of metamorphic zircons also corroborate the fact that they have simply been affected by hydrothermal fluids without intense metasomatic alteration or growth from typical metamorphic processes. Moreover, other granitoids from other parts of the CAFB that have undergone similar tectonometamorphic and structural evolution have similar ages (e.g., Bouyo Houketchang et al, 2016;Ateh et al, 2017;Li et al, 2017;Embui et al, 2019;Bute et al, 2020). The discriminant diagrams: U versus Th, Y versus U and Yb versus Yb/Sm (Figs.…”

Section: Zircon Grainsmentioning

confidence: 99%

“…Granitoids crystallisation and mineralisation temperature of the Kambélé area. Embui et al, 2019;Bute et al, 2020). Thus, the 589±36 Ma is interpreted as the age of emplacement of the Kambélé pluton.…”

Section: Kambélé Granitoid Age Within the Context Of Felsic Plutonism In Cameroonmentioning

confidence: 99%

See 2 more Smart Citations

Emplacement timing, temperature, and redox conditions of the Kambélé auriferous pluton, Batouri gold District, SE Cameroon

et al. 2022

View full text Add to dashboard Cite

The Kambélé auriferous pluton in south-eastern Cameroon is within the Central African Fold Belt (CAFB). New zircon LA-ICP-MS U-Pb ages, REEs patterns, zircon Ce 4+ / Ce 3+ ratios, and Ti-in-zircon thermometry, have been used to decipher the timing of mineralisation, redox conditions and emplacement temperature of the pluton. Cathodoluminescence images of 12 representative zircon grains from the Kambélé pluton reveal two types of zircon grains: type 1 grains are characterized by dark cores, serrated margins and poorly defined zonation; type 2 grains are euhedral to subhedral, elongated, with core to rim zonation and with darker rims indicative of a pristine magmatic source. The zircon grains are depleted in light rare earth elements. Chondrite-normalised REE patterns show undefined Ce anomalies and negative Eu anomalies indicating moderately oxidised to reduced conditions. Zircon U-Pb age of the granitoid is constrained to Neoproterozoic with a mean age of 589±36 Ma indicating gold mineralisation during the Pan African orogeny. Crystallization temperatures range from 525-1033°C with a mean temperature of ~712°C, concomitant with granitoid emplacement temperatures within the Adamawa Yadé Domain of the CAFB.

show abstract

Section: Zircon Grainssupporting

confidence: 70%

Section: Zircon Grainsmentioning

confidence: 99%

See 1 more Smart Citation

Emplacement timing, temperature, and redox conditions of the Kambélé auriferous pluton, Batouri gold District, SE Cameroon

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The Adamawa-Yadé domain is characterized by widespread syn-to post-collisional granitoids of Neoproterozoic in age ([4] [5] [6]). During the past two decades, these granitoids have been studied in order to better understand the geodynamic evolution of this orogenic belt, which generally involve collision processes between continents ( [7]- [12]) However, except recent works ( [13] [14]), these studies do not integrate the trace element composition of zircon as well as the temperatures of the magma in which these zircons were crystallized.…”

Section: Introductionmentioning

confidence: 99%

Zircon Trace Element Geochemistry and Ti-in-Zircon Thermometry of the Ngazi-Tina Pan-African Post-Collisional Granitoids, Adamawa Cameroon

Ngoniri¹,

Djomo²,

Ngnotue³

et al. 2021

IJG

View full text Add to dashboard Cite

In Cameroon, the Ngazi-Tina region belongs to the Adamawa-Yade domain of the Pan-African Central African Fold Belt (CAFB). It is composed of two petrographic types: quartz-monzonites (majority) and nepheline syenites. Two morphological types, prismatic and pyramidal, were recognized in the zircon grains samples. These zircon types display internal structures typical of magmatic zircons. Zircons separated from the Ngazi-Tina samples contain higher abundances of Hf (close to 8000 ppm) and moderate trace elements (Y, Th, U, Nb, Ta) and REE contents, suggesting a variable degree of magmatic evolution. The chondrite-normalized REE patterns of zircons are characterized by LREE depletion relative to HREE with positive Ce and negative Eu anomalies, typical of magmatic zircons. The high Hf content together with high Ce/Ce*, Th/U, Zr/Hf ratios suggest magma crystallization under variable oxidation and oxygen fugacity. The application of Ti-in-zircon thermometer reveals crystallization temperatures ranging from 678˚C to 811˚C and 658˚C to 768˚C for quartz monzonites and nepheline syenites respectively. These features indicate probably a partial melting of continental crust as the source of these zircons grains and emplacement in the magmatic-arc setting.

show abstract

“…These studies have improved our understanding of the magma sources, petrogenetic processes, and involvement of juvenile and/or recycled material, emplacement ages, and tectonic settings of the CAFB. However, despite the large occurrence in these rocks of zircons and despite the petrogenetic importance of the trace elements geochemistry of these minerals, very few studies (e.g., Embui et al, 2019, Hamdja Ngoniri et al, 2021) dealing with the petrogenesis and tectonic setting of the CAFB Pan‐African granitoids have utilized zircon trace elements' composition. As such, the magma conditions in which zircons were crystallized and the relation between magma temperatures and tectonic setting are still unclear.…”

Section: Introductionmentioning

confidence: 99%

Zircon trace element geochemistry and Ti‐in‐zircon thermometry of the Linté Pan‐African granitoids, Central Cameroon: Constraints on the genesis of host magma and tectonic implications

et al. 2021

View full text Add to dashboard Cite

The Linté area belongs to the central part of the Adamawa‐Yadé Domain (AYD) within the Pan‐African Central African Fold Belt (CAFB) in Cameroon. This area is dominated by Neoproterozoic high‐K calc‐alkaline syenite and monzonite intruding Archean to Palaeoproterozoic gneisses. In this contribution, trace element compositions of zircon obtained using laser ablation inductively coupled plasma mass spectrometry are used to constrain the petrogenesis and tectonic setting of Linté area. The analysed zircon grains display restricted ranges of Hf contents with an average of 8,197 ppm in syenite, 8,220 ppm in alkali‐feldspar syenite, and 9,026 ppm in monzonite. They display high Th/U ratios (>0.5) typical of magmatic zircons. The monzonite zircons have a higher ∑REE content (483.42 ppm) than the syenite zircons (237.70 ppm). The chondrite‐normalized rare‐earth element (REE) diagram of Linté samples shows very similar patterns, characterized by a steeply rising slope due to important heavy rare‐earth element enrichment relative to light rare‐earth element, with distinctive positive Ce and negative Eu anomalies. The application of the Ti‐in‐zircon thermometer reveals a wide range of crystallization temperatures (574–1,137°C for syenites and 713–1,008°C for monzonite), implying a deep level of melting, likely within the lower continental crust of the CAFB. The integration of geochemical behaviours of some trace elements (U, Hf, Zr, Ce, Th, and Nb), together with discrimination diagrams, suggests the crystallization of a continental crust‐derived magma under variable oxidation states and emplacement in a magmatic‐arc setting. This finding represents and adds on to the N‐S geodynamic convergence model between the AYD and the northern border of the Congo Craton.

show abstract

Zircon chemistry and new laser ablation U–Pb ages for uraniferous granitoids in SW Cameroon

Cited by 8 publications

References 89 publications

Emplacement timing, temperature, and redox conditions of the Kambélé auriferous pluton, Batouri gold District, SE Cameroon

Emplacement timing, temperature, and redox conditions of the Kambélé auriferous pluton, Batouri gold District, SE Cameroon

Zircon Trace Element Geochemistry and Ti-in-Zircon Thermometry of the Ngazi-Tina Pan-African Post-Collisional Granitoids, Adamawa Cameroon

Zircon trace element geochemistry and Ti‐in‐zircon thermometry of the Linté Pan‐African granitoids, Central Cameroon: Constraints on the genesis of host magma and tectonic implications

Contact Info

Product

Resources

About