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

Ngoniri, Alexis Hamdja; Djomo, Habib Dadjo; Ngnotue, Timoléon; Kenné, Patrick Ayonta; Mbianya, Ghislain Ngassam; Ganno, Sylvestre; Nzenti, Jean Paul

doi:10.4236/ijg.2021.124017

Cited by 11 publications

(1 citation statement)

References 60 publications

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“…Petrologic and isotopic data collected along these major shear zones in Cameroon have been used to subdivide this mobile belt in Cameroon into the following lithotectonic domains: (1) the Yaoundé Domain (YD), (2) the Adamawa-Yadé Domain (AYD), and (3) the North Western Cameroon Domain (NWCD), to which the present study area belongs (Fig. 1b, Toteu et al, 2004;Kankeu et al, 2009;Ngoniri et al, 2021).…”

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Mining of alluvial cassiterite and its compositional diversity at the Mayo Darlé area, northern Cameron

Njiganga

Tebogo²,

Ngatcha³

et al. 2023

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Cassiterite mineralization occurs in both the rock and the alluvial system in the Mayo-Darlé area of northern Cameroon. This study focuses on the morphology, mineral inclusions, and composition of alluvial cassiterite derived from Bambol and Mayo Seni localities, where active alluvial mining by artisans constitutes the most important rural economic activity. The cassiterite grains were primarily analyzed by backscattered electron (BSE) images to investigate their morphological characteristics and mineral inclusions. The composition was examined through electron microprobe analysis (EMPA). The cassiterite grains have an irregular to sub-rounded morphology, indicating proximity to the source, although most of the cassiterite grains display evidence of mechanical transport and abrasion. EMPA results show mainly high SnO2 content (93–103 wt. %), highlighting the predominance of cassiterite minerals in the humid tropical region. Among the Sn substituting elements, only Fe, Ta, and Mn were detected at very low concentrations (Fe = 0.02 to 0.3 FeO, Mn = 0 to 0.04 MnO, and Ta = 0 to 0.2 Ta2O5) all in wt. % respectively, suggesting little variation in the alluvial cassiterite compositions. This high SnO2 content indicates the purity of cassiterite in the area. Binary plots of compositional variation have similar trends, suggesting that cassiterite was derived from a single bedrock source, despite having a mixed signature of pegmatite- and hydrothermal-derived cassiterite. Mineral inclusions include quartz, hematite, and columbite group minerals (CGMs), which were similar in all the samples, suggesting a homogeneous source. The quartz inclusions highlight quartz veins associated with the mineralization and potential felsic plutonic bedrocks. The chemical signatures of the studied cassiterite grains are useful tools to explore the environment of an unknown primary source that can greatly help in mineral exploration in northern Cameroon.

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Mining of alluvial cassiterite and its compositional diversity at the Mayo Darlé area, northern Cameron

Njiganga

Tebogo²,

Ngatcha³

et al. 2023

Preprint

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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

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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.

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Searching gold origin through litho-structural analysis and morphological characterization of alluvial gold nuggets in the Guiwa-Yangamo area (Batouri goldfield, Eastern Cameroon)

et al. 2021

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

Cited by 11 publications

References 60 publications

Mining of alluvial cassiterite and its compositional diversity at the Mayo Darlé area, northern Cameron

Mining of alluvial cassiterite and its compositional diversity at the Mayo Darlé area, northern Cameron

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

Searching gold origin through litho-structural analysis and morphological characterization of alluvial gold nuggets in the Guiwa-Yangamo area (Batouri goldfield, Eastern Cameroon)

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