The upper mantle under La Palma, Canary Islands: formation of Si-K-Na-rich melt and its importance as a metasomatic agent
Article Abstract:
Mantle xenoliths of the Historic Volcan de San Antonio, La Palma, Canary Islands, comprise spinel harzburgites, spinel dunites and lherzolites. They show an enrichment in the strongly incompatible trace elements and a depletion in the moderately incompatible ones. The veined xenoliths exhibit a compositional gradation, from alkaline to highly silicic compositions. Petrographic studies suggest that reactions between basaltic melts and the peridotite wall-rock gave rise to highly Si-Na-K rich melts which were responsible for pervasive metasomatism in the upper mantle under La Palma.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1996
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K-rich glass-bearing wehrlite xenoliths from Yitong, northeastern China: petrological and chemical evidence for mantle metasomatism
Article Abstract:
The reaction between an infiltrating metasomatic melt and the lherzolite mantle has produced the wehrlite xenoliths in Yitong, northeastern China. The melt replaced the Cr-diopside, primary spinel and enstatite to form secondary clinopyroxene, olivine, chromite and feldspar. The wehrlites are porphyroclastic with large olivine grains present in a fine-grained matrix. The wehrlite xenoliths contain a large amount of glass. The intrusion of mantle metasomatic melts formed from partial melting of peridotites has produced the glass.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1996
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Metasomatism in mantle xenoliths from Gees, West Eifel, Germany: evidence for the genesis of calc-alkaline glasses and metasomatic Ca-enrichment
Article Abstract:
Metasomatism in the mantle xenoliths from Gees, West Eifel, Germany, occurs by silicate melts and the carbonatite metasomatism is almost absent. The silicate glass is present in almost all stages of transformations during metasomatism. The remnants of the upper mantle hybrid melts generate the Si-Al-enriched glasses of the xenoliths metasomatized by silicate melts. Ca-enrichment of the xenoliths may be due to low activities of silica.
Publication Name: Contributions to Mineralogy and Petrology
Subject: Earth sciences
ISSN: 0010-7999
Year: 1995
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