Olivine chemistry from Cameroon: evidence of carbonate metasomatism along the ocean-continental boundary of the Cameroon volcanic line

Ngwa, Caroline Neh; Shu, Bless N.; Mbassa, Benoît Joseph; Aka, Festus Tongwa; Wokwenmendam, Pauline Nguet

doi:10.1007/s00710-019-00689-5

Cited by 4 publications

(4 citation statements)

References 79 publications

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“…This would indicate the absence of any contamination. This has already been discussed by [11,30] . It can therefore be concluded that the composition of the liquids trapped as melt inclusions in the most magnesian olivines of Mount Cameroon is not affected by the assimilation in the magmatic chamber.…”

Section: Crustal Contaminationsupporting

confidence: 59%

“…The studies carried out so far on Mount Cameroon show that the basaltic lavas of this volcano evolved essentially through the processes of fractional crystallization, partial melting, magma mixing and metasomatism. [9][10][11] . Previous work on lava flows from Mount Cameroon focus on mineralogical [11] , petrological [12,13] , geochemical, volcanological [14,15] and even geochronological studies [10] with very little attention paid to melt inclusions, which are very useful in modern petrology of magmatic rocks and whose study would provide us with crucial information that cannot be obtained with previous approaches.…”

mentioning

confidence: 99%

“…[9][10][11] . Previous work on lava flows from Mount Cameroon focus on mineralogical [11] , petrological [12,13] , geochemical, volcanological [14,15] and even geochronological studies [10] with very little attention paid to melt inclusions, which are very useful in modern petrology of magmatic rocks and whose study would provide us with crucial information that cannot be obtained with previous approaches. It is therefore clear that there is a scarcity of research on primitive magmas as such and their contribution to the understanding of the magmatism of the Mount Cameroon [16] in particular and the Cameroon Volcanic Line (CVL) in general.…”

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confidence: 99%

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New Data on the Genesis and Evolution of the Primitive Magmas of Mount Cameroon: Contribution of Melt Inclusions

et al. 2020

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Mount Cameroon is a Plio-Quaternary volcanic massif, without a central crater, made up ofmore than 140 pyroclastic cones. It is one of the active volcanoes of the Cameroon Line. Mount Cameroon magmatic inclusions are found in microdroplets trapped in the early minerals (olivines) from the pyroclastic products. The analysis of these magmatic inclusions allowed us to find primitive liquids compared to lavas. Major elements study of the magmatic inclusions, trapped in the most magnesian olivines (Mg#84-86) of Mount Cameroon revealed "primitive" liquids of basanite and alkaline basalt type with variable composition compared to the much more uniform basalts of the magmatic series of Mount Cameroon. The study of these trapped liquids shows that: (i)- the original primitive lavas did not undergo the process of evolution by FC, but rather underwent fundamentally (or exclusively) the process of partial melting; (ii) the emitted lavas, evolved essentially by FC; (iii) the variations in the trace element contents of the primitive liquids directly reflect a variation in the rate of partial melting of a homogeneous mantelic source. The very high La/Yb ratios of the Mount Cameroon inclusions (> 20) characterize a garnet lherzolite source. Spectra of the magmatic inclusions show a negative anomaly or depletion in K, Rb and Ba as those of HIMU. The "primitive" liquids and lavas of Mount Cameroon represent a co-genetic sequence formed by varying degrees of partial melting of a source considered as homogeneous.

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Section: Crustal Contaminationsupporting

confidence: 59%

mentioning

confidence: 99%

mentioning

confidence: 99%

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New Data on the Genesis and Evolution of the Primitive Magmas of Mount Cameroon: Contribution of Melt Inclusions

et al. 2020

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“…Magmas of intermediate or felsic composition have two main formation processes which are fractional crystallisation and assimilation. They can also be formed by the interaction of felsic and contemporary mafic magmas as suggested by Tchop et al (2020); or partial melting of crustal material (Nkouandou et al, 2008;Ngwa et al, 2019), or partial melting of the metasomatised mantle wedge. The absence of mafic enclaves or mafic-felsic mixtures in the study area excludes the hypothesis of interaction of felsic and contemporary mafic magmas.…”

Section: Petrogenesis and Origin Of Magmasmentioning

confidence: 99%

Magmatism of the Beka Volcanic Massifs (Cameroon Volcanic Line, West-Central Africa): New Petrographical and Mineralogical Data

Dili-Rake¹,

Abdoulaye²,

Tchop³

et al. 2022

GEP

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The Beka volcanic massifs are located northeast of Ngaoundere region, within the Adamawa plateau. It consists mainly of basanites, trachytes and phonolites. The petrographic study shows that all the basanite lavas have porphyritic microlitic textures with a more pronounced magmatic fluidity than the felsic lavas displaying trachytic textures. The lavas are composed of phenocrysts, microlites and microphenocrysts of olivine, clinopyroxene, plagioclase and iron-titanium oxides for the basanites and of greenish clinopyroxene, alkali feldspar, and titanomagnetite for the felsic lavas. Chemical microprobe analysis indicates that the olivine crystals are magnesian (Fo 73-78 ). Clinopyroxene crystals have a composition of diopside (Wo 47-) in the basaltic lavas and diopside near the hedenbergite pole in the trachytes phonoliths and titanomagnetite (TiO 2 : 21.13% -22.36% and FeO: 68% -68%). Chemical analyses on whole rocks show that all the lavas belong to the same series and the felsic lavas come from the differentiation of basanite lavas by fractional crystallization of the minerals therein. The basanites originate from a low rate of partial melting of an OIB-type mantle. Contamination and mixing processes are suspected. Lavas of similar composition are found in other volcanic centres of the Adamawa plateau and the continental and oceanic sectors of the Cameroon Volcanic Line, in particular the Kapsiki plateau, Mounts Cameroon and Bamenda.

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Olivine in lamprophyres of the Kola Alkaline Province and the magmatic evolution of olivine in carbonate melts

Vozniak

Kopylova

Peresetskaya

et al. 2023

Lithos

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Olivine chemistry from Cameroon: evidence of carbonate metasomatism along the ocean-continental boundary of the Cameroon volcanic line

Cited by 4 publications

References 79 publications

New Data on the Genesis and Evolution of the Primitive Magmas of Mount Cameroon: Contribution of Melt Inclusions

New Data on the Genesis and Evolution of the Primitive Magmas of Mount Cameroon: Contribution of Melt Inclusions

Magmatism of the Beka Volcanic Massifs (Cameroon Volcanic Line, West-Central Africa): New Petrographical and Mineralogical Data

Olivine in lamprophyres of the Kola Alkaline Province and the magmatic evolution of olivine in carbonate melts

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