Volcanism and Evolution of the African Lithosphere

Mineralogical and geochemical fingerprints of mantle metasomatism beneath Nyos volcano (Cameroon volcanic line)
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Published:June 01, 2011
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CiteCitation
M.I. Teitchou, M. Grégoire, R. Temdjim, R.T. Ghogomu, C. Ngwa, F.T. Aka, 2011. "Mineralogical and geochemical fingerprints of mantle metasomatism beneath Nyos volcano (Cameroon volcanic line)", Volcanism and Evolution of the African Lithosphere, Luigi Beccaluva, Gianluca Bianchini, Marjorie Wilson
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Basaltic lavas of Nyos volcano (Cameroon) mostly contain mantle peridotite xenoliths consisting of spinel-bearing lherzolites and harzburgites. Based on the trace-element patterns, especially rare earth element (REE) patterns, two groups of samples have been distinguished: group 1 samples are characterized by spoon-shaped REE patterns, and group 2 samples show light (L) REE–enriched patterns. Mineralogical characteristics together with major- and trace-element compositions point to a low degree of partial melting (less than 5%) and metasomatic processes. The latter mechanism explains in particular the LREE content of bulk rocks and clinopyroxenes and the occurrence of hydrous minerals in some samples. All the...
- Africa
- alkalic composition
- basaltic composition
- Cameroon
- Cameroon Line
- Cenozoic
- chemical composition
- crystal chemistry
- electron probe data
- harzburgite
- ICP mass spectra
- igneous rocks
- inclusions
- Lake Nyos
- lava
- lava flows
- lherzolite
- lithosphere
- magmatism
- major elements
- mantle
- mass spectra
- melts
- metals
- metasomatism
- mineral composition
- Oligocene
- Paleogene
- partial melting
- patterns
- peridotites
- plutonic rocks
- rare earths
- spectra
- spinel peridotite
- Tertiary
- thermal anomalies
- trace elements
- ultramafics
- volcanoes
- West Africa
- X-ray fluorescence spectra
- xenoliths
- northwestern Cameroon