Evolution of parental magmas of Miocene shield basalts of Gran Canaria (Canary Islands): constraints from crystal, melt and fluid inclusions in minerals

Article Abstract:

Detailed mineralogical and geochemical studies of melt, crystal and fluid inclusions in phenocrysts from the Miocene shield basalts on Gran Canaria, Canary Islands, facilitate the characterization of the parental magma composition and their evolutionary conditions. Microthermometry indicates primary magma composition in equilibrium with olivine Fo(sub 90-92). Major element studies suggest that the primary magmas originated over the temperature range 1500-1600 degrees celsius at more than 30 kbar pressure. Mantle melting processes and the subsequent magma migration are discussed.

Usage, Temperature measurements, Temperature measurement

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Mixing of rhyolite, trachyte and basalt magma erupted from a vertically and laterally zoned reservoir, composite flow P1, Gran Canaria

Article Abstract:

An analysis of volcanic materials found on the 14.1 Ma composite in Gran Canaria is presented. The ignimbrite P1 is composed of 4 magma parts which are mixed in vertically varying proportions. The mixing process covered an initial stage where trachytic and rhyolitic magma mixes wereformed, a secondary stage where mixing was accompanied by magma withdrawal fromvolcanic chambers and a final stage where fragmentation and particulate vent transport accompanied eruptive pulses while pyroclastic flows influenced additional mixing.

Volcanic ash, tuff, etc., Volcanic rocks, Rhyolite

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Multi-stage magma ascent beneath the Canary Islands: evidence from fluid inclusions

Article Abstract:

A study was conducted on fluid inclusions in olivine phenocrysts and in several xenoliths found in basaltic rocks from the Canary Islands to examine the magma plumbing system beneath it. Results show a bimodal density distribution with the lower-density maximum consisting of both texturally early and late inclusions. Results also suggest that magma accumulation beneath the Canary Islands involved several tectonic stages.

Natural history, Olivine, Canary Islands, Porphyry

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