Extreme source heterogeneity and complex contamination patterns along the Cameroon Volcanic Line: New geochemical data from the Bamoun plateau

Bidias, Luc Achille Ziem à; Chazot, Gilles; Moundi, Amidou; Nonnotte, Philippe

doi:10.1016/j.crte.2017.11.004

Cited by 22 publications

(4 citation statements)

References 35 publications

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“…(2018), Ziem à Bidias et al. (2018, 2021), and Asaah et al. (2015, 2021) report that CVL lavas originate from an enriched mantle source with a high‐μ signature, thereby providing evidence for a deep mantle contribution.…”

Section: Discussion and Interpretationmentioning

confidence: 99%

Deep Mantle Influence on the Cameroon Volcanic Line

Saeidi

Hansen

Nyblade

2023

Geochem Geophys Geosyst

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Section: Discussion and Interpretationmentioning

confidence: 99%

Deep Mantle Influence on the Cameroon Volcanic Line

Saeidi

Hansen

Nyblade

2023

Geochem Geophys Geosyst

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“…It has been established that contributions from both the SCLM and asthenosphere characterized CVL magmatism involving three types of the mantle, namely DMM with EM1 and EM2 (Asaah et al, 2015, 2020; Kamgang et al, 2013; Yokoyama et al, 2007; Ziem à Bidias et al, 2018). Trace elements or the proportion of isotopic data also fluctuated in the source of the dykes with the magmatism of CVL.…”

Section: Discussionmentioning

confidence: 99%

“…at superficial levels compared to samples of DPB with high Ce/Yb values (D5: 38.56 and D1: 39.14) illustrating the deep origin of this magma. Taking into account the literature data, we note that for the majority of cases, the magma responsible for the formation of the samples of the Cretaceous sedimentary basin (DCSB and FGG) have a less deep origin compared to the DPB samples in the Sm/Yb versus La/Sm diagram (Figure 13d).5.5 | Nature of the source componentsIt has been established that contributions from both the SCLM and asthenosphere characterized CVL magmatism involving three types of the mantle, namely DMM with EM1 and EM2(Asaah et al, 2015(Asaah et al, , 2020Kamgang et al, 2013;Yokoyama et al, 2007;Ziem à Bidias et al, 2018). Trace elements or the proportion of isotopic data also fluctuated in the source of the dykes with the magmatism of CVL.…”

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confidence: 97%

Major, trace elements and Sr–Nd–Pb isotopes systematics of mafic dykes from the Figuil (northern Cameroon) and Léré (southwestern Chad) areas

Gountié Dedzo,

Klamadji,

Zangmo Tefogoum

et al. 2023

Geological Journal

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In this study, field descriptions of the dolerite dykes cross‐cutting the Pan‐African basement (DPB) and the dolerite and gabbroic dykes cross‐cutting the Cretaceous sedimentary basin (DGCSB) are used together with petrographic, bulk‐rock geochemistry, as well as Sr–Nd–Pb isotopic data to constrain the geodynamic setting and origin of these mafic (basanite, basalt and basaltic andesite in composition) rocks that outcrop in the Figuil–Léré area. The DPB dykes are alkaline with SiO2 of 46.63–49.03 wt% and MgO of 3.93–7.11 wt%. In contrast, the DGCSB dykes are subalkaline with SiO2 ranging between 50.24 and 53.16 wt% and MgO fluctuating between 5.22 and 7.90 wt%, comparable to dykes described in other regions of the Cameroon Line (CL). The rocks studied belong to the tholeiitic series and were emplaced in within‐plate basalts (WPB) and mid‐ocean ridge basalts (MORBs) setting. The variations in major and trace elements from the basanite to basaltic andesite compositions are dependable with fractional crystallization (FC) of different mineral phases such as opaque minerals, olivine, clinopyroxene, amphibole and alkali feldspar. Most samples exhibit negative Nb–Ta and positive Sr anomalies, which together with the negative correlation between MgO and 87Sr/86Sr, and isotopic ratio of 206Pb/204Pb <19.5 (18.27–19.49) suggests interactions of crustal components. Nevertheless, this contamination seems limited because there is a positive correlation between SiO2 and 143Nd/144Nd plot and low Ba contents (72–210 ppm) of the samples compared to the mid‐continental crust (259–628 ppm). Trace element modelling proposes a derivation of the Figuil–Léré dykes from parental melts generated by 4%–15% partial melting of a source containing garnet peridotite in the mixed lithospheric–asthenospheric mantle. The isotopic data of the dykes studied with hybrid magma composition are characterized by more radiogenic 87Sr/86Sr, 143Nd/144Nd and 206Pb/204Pb isotopic ratios with a dominant mixing of depleted MORB mantle (DMM)–enriched mantle 1 (EM1)–enriched mantle 2 (EM2), like those of other mafic dykes of the CL.

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“…It is responsible for a large compositional variability in rock suites as well as for triggering volcanic eruptions (e.g., Tomiya et al, 2013). On their way to the surface or during residence in magma chambers, andesitic and dacitic melts may easily be in contact with granitic crustal materials (e.g., Eichelberger, 1974;Bidias et al, 2018;Chen et al, 2020). The extent of the chemical interaction between these materials remains a topic of debate, particularly among petrologists and volcanologists.…”

Section: Introductionmentioning

confidence: 99%

The contribution of chaotic dynamics on the genesis of Chapecó silicic rocks from Paraná-Etendeka Magmatic Province: an experimental approach

Vicentini

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As pessoas que fazem parte desta longa jornada são muitas. Em primeiro lugar agradeço a Deus por ter chegado até aqui. Agradeço imensamente à minha amada esposa pelo apoio, esforço, companheirismo, carinho e a paciência. Sem você, Maria Julia, tudo seria pesado demais. Agradeço ao Ícaro, que participou tanto quanto nós deste processo, e que junto com Luiz e Clara alegram muito a nossa vida. Agradeço muitíssimo aos meus pais e ao Pedro, de quem nunca faltaram apoio e encorajamento. Vocês me ensinaram a valorizar o estudo e a dedicação no aprendizado. Muito obrigado, família! Eu agradeço muito à Prof. Dra. Leila Marques, que sempre me orientou, apoiou e buscou aperfeiçoar em mim o olhar crítico-científico através de muitas discussões. Igualmente, agradeço à Prof. Dra. Cristina de Campos, que esteve conosco desde a concepção do projeto, e que me acolheu como um filho durante o estágio em Munique. Muito obrigado! Também agradeço àqueles que contribuíram em cada etapa deste projeto: ao Prof. Dr. Antonio Nardy pelas discussões e viagem de campo; Carol, Júlio, Zanon e Limeira, que me ajudaram na coleta de amostras; agradeço a todos os professores do IAG, mas em especial, aos professores Carlos Mendonça e Victor Sacek, que contribuíram com aulas, opiniões e discussões; todo os funcionários do IAG, em especial à Sonia; e ao Prof. Dr. Valdecir Janasi, que viabilizou o meu período de estágio na LMU. Agradeço às agências de fomento CAPES e CNPq pelas bolsas de estudo (CAPES: processos 88882.332947/2019-01, 88887.363370/2019-00 e 88887.650486/2021-00), diárias de campo e análises (CNPq processo: 303139/2017-0). I would like to thank Professor Dr. Don Dingwell for the supervision during my time at LMU, and for extending it during COVID pandemic. Thank you for all support! I am very grateful for the LMU staff that patiently helped me. In especial, I thank Dr.Werner Ingrisch who performed all experiments with me. I also thank Kai Hess,

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Extreme source heterogeneity and complex contamination patterns along the Cameroon Volcanic Line: New geochemical data from the Bamoun plateau

Cited by 22 publications

References 35 publications

Deep Mantle Influence on the Cameroon Volcanic Line

Deep Mantle Influence on the Cameroon Volcanic Line

Major, trace elements and Sr–Nd–Pb isotopes systematics of mafic dykes from the Figuil (northern Cameroon) and Léré (southwestern Chad) areas

The contribution of chaotic dynamics on the genesis of Chapecó silicic rocks from Paraná-Etendeka Magmatic Province: an experimental approach

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