Geochemistry of lavas from maar-bearing volcanoes in the Oku Volcanic Group of the Cameroon Volcanic Line

Asaah, Asobo Nkengmatia Elvis; Yokoyama, T.; Aka, Festus Tongwa; Usui, Tomohiro; Kuritani, Takeshi; Wirmvem, Mengnjo Jude; Iwamori, Hikaru; Fozing, Eric Martial; Tamen, Jules; Mofor, Gilbert Zechia; Ohba, Takayoshi; Tanyileke, Gregory; Hell, Joseph Victor

doi:10.1016/j.chemgeo.2015.03.030

Cited by 31 publications

(16 citation statements)

References 55 publications

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“…The metasomatism affected the SCLM, inducing hydrous minerals like amphibole and phlogopite that are not stable in the asthenosphere. Asaah et al (2015) suggest that the metasomatic fluids crystallized as small pockets or veins in the SCLM. An ultimate source of CO 2 in the Nyos magma may derive from the decarbonation of such crystallized metasomatic fluids.…”

Section: -4 Volatiles In Magmamentioning

confidence: 99%

“…The ultimate source of CO 2 in the Nyos magma may derive from the decarbonation of crystallized metasomatic fluids in the (Holloway and Blank, 1994;Shinohara, 2003). (Holloway and Blank, 1994;Shinohara, 2003 subcontinental lithosphere Asaah et al, 2015). The permanent supply of such CO 2 is likely to be responsible for the high concentration of CO 2 gas in the fluids feeding into Lakes Nyos and Monoun.…”

Section: -4 Volatiles In Magmamentioning

confidence: 99%

“…The project went well in terms of scientific achievement. Many scientific papers were published, e.g., Issa et al (2013Issa et al ( , 2014aIssa et al ( , 2014b, Asaah et al (2014Asaah et al ( , 2015, Chako , Fouépé et al (2013), Fantong et al (2013Fantong et al ( , 2015, Tiodjio et al (2014Tiodjio et al ( , 2015Tiodjio et al ( , 2016, Kamtchueng et al (2014Kamtchueng et al ( , 2015aKamtchueng et al ( , 2015b, , Ohba et al (2016), Kozono et al (2016), and Saiki et al (2016).…”

Section: Satreps-nymo: a Project To Reduce The Risk Of Another Limnicmentioning

confidence: 99%

“…Instead, based on major and trace elements systematics, proposed that the Nyos basalts formed by a small degree (1~2%) of partial melting of the primitive mantle to which amphibole and phlogopite had been added by carbonatitic fluids, and that decarbonation reactions of the carbonatitic metasomatism are responsible for producing the magmatic CO 2 . However, based on the geochemical data of the Nyos volcanic rocks, Asaah et al (2015) suggest that CVL magmatism is predominantly of an asthenospheric source with little contribution from the subcontinental lithospheric mantle (SCLM). The lavas show evidence of enrichment by metasomatic fluids probably in the Mesozoic (e.g., Halliday et al, 1990;Asaah et al, 2015).…”

Section: -4 Volatiles In Magmamentioning

confidence: 99%

“…However, based on the geochemical data of the Nyos volcanic rocks, Asaah et al (2015) suggest that CVL magmatism is predominantly of an asthenospheric source with little contribution from the subcontinental lithospheric mantle (SCLM). The lavas show evidence of enrichment by metasomatic fluids probably in the Mesozoic (e.g., Halliday et al, 1990;Asaah et al, 2015). The metasomatism affected the SCLM, inducing hydrous minerals like amphibole and phlogopite that are not stable in the asthenosphere.…”

Section: -4 Volatiles In Magmamentioning

confidence: 99%

See 4 more Smart Citations

Lakes Nyos and Monoun Gas Disasters (Cameroon)—Limnic Eruptions Caused by Excessive Accumulation of Magmatic CO<sub>2</sub> in Crater Lakes

Kusakabe¹

2017

GEochem. Monogr. Ser.

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Section: -4 Volatiles In Magmamentioning

confidence: 99%

Section: -4 Volatiles In Magmamentioning

confidence: 99%

Section: Satreps-nymo: a Project To Reduce The Risk Of Another Limnicmentioning

confidence: 99%

Section: -4 Volatiles In Magmamentioning

confidence: 99%

Section: -4 Volatiles In Magmamentioning

confidence: 99%

See 3 more Smart Citations

Lakes Nyos and Monoun Gas Disasters (Cameroon)—Limnic Eruptions Caused by Excessive Accumulation of Magmatic CO<sub>2</sub> in Crater Lakes

Kusakabe¹

2017

GEochem. Monogr. Ser.

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Lithospheric mantle refertilization by DMM-derived melts beneath the Cameroon Volcanic Line—a case study of the Befang xenolith suite (Oku Volcanic Group, Cameroon)

Tedonkenfack

Puziewicz

Aulbach

et al. 2021

Contrib Mineral Petrol

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The origin and evolution of subcontinental lithospheric mantle (SCLM) are important issues of Earth’s chemical and physical evolution. Here, we report detailed textural and chemical analyses on a mantle xenolith suite from Befang (Oku Volcanic Group, Cameroon Volcanic Line), which represents a major tectono-magmatic structure of the African plate. The samples are sourced from spinel-facies mantle and are dominated by lherzolites. Their texture is cataclastic to porphyroclastic, and foliation defined by grain-size variation and alignment of spinel occurs in part of peridotites. Spinel is interstitial and has amoeboidal shape. Clinopyroxene REE patterns are similar to those of Depleted MORB Mantle (DMM) except LREEs, which vary from depleted to enriched. The A-type olivine fabric occurs in the subset of one harzburgite and 7 lherzolites studied by EBSD. Orthopyroxene shows deformation consistent with olivine. The fabric of LREE-enriched clinopyroxene is equivalent to those of orthopyroxene and olivine, whereas spinel and LREE-depleted clinopyroxene are oriented independently of host rock fabric. The textural, chemical and thermobarometric constraints indicate that the Befang mantle section was refertilised by MORB-like melt at pressures of 1.0–1.4 GPa and temperatures slightly above 1200–1275 °C. The olivine-orthopyroxene framework and LREE-enriched clinopyroxene preserve the protolith fabric. In contrast, the LREE-depleted clinopyroxene, showing discordant deformation relative to the olivine-orthopyroxene protolith framework, and amoeboidal spinel crystallized from the infiltrating melt. The major element and REEs composition of minerals forming the Befang peridotites indicate subsequent reequilibration at temperatures 930–1000 °C. This was followed by the formation of websterite veins in the lithospheric mantle, which can be linked to Cenozoic volcanism in the Cameroon Volcanic Line that also brought the xenoliths to the surface. This study therefore supports the origin of fertile SCLM via refertilization rather than by extraction of small melt fractions, and further emphasizes the involvement of depleted melts in this process.

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

et al. 2019

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Geochemistry of lavas from maar-bearing volcanoes in the Oku Volcanic Group of the Cameroon Volcanic Line

Cited by 31 publications

References 55 publications

Lakes Nyos and Monoun Gas Disasters (Cameroon)—Limnic Eruptions Caused by Excessive Accumulation of Magmatic CO<sub>2</sub> in Crater Lakes

Lakes Nyos and Monoun Gas Disasters (Cameroon)—Limnic Eruptions Caused by Excessive Accumulation of Magmatic CO<sub>2</sub> in Crater Lakes

Lithospheric mantle refertilization by DMM-derived melts beneath the Cameroon Volcanic Line—a case study of the Befang xenolith suite (Oku Volcanic Group, Cameroon)

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

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