Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/53937
Title: Phonolitic origin of Roque-Nublo ignimbrites of Gran-Canaria (Canary-Islands, Spain) from clinopyroxene melt inclusion studies
Authors: Mangas, J 
Pereztorrado, Fj 
Massare, D
Clocchiatti, R
Keywords: Melt inclusions
Clinopyroxenes
Phonolites
Roque Nublo ignimbrites
Gran Canaria, et al
Issue Date: 1993
Publisher: 0935-1221
Journal: European Journal of Mineralogy 
Abstract: The Roque Nublo non-welded ignimbrites - which are Pliocene in age (5-3.5 Ma.) - are characteristic deposits of the second magmatic cycle on Gran Canaria. They are very heterogeneous, with 30-50 % volume lithic fragments, 15-20 % mildly vesiculated pumice, 5-10 % phenocrysts and 30-40 % ash matrix. The juvenile materials (pumice fragments and ash matrix) are largely altered to zeolites. A melt inclusion study using microthermometric and electron-microprobe analyses was carried out on clinopyroxenes from Roque Nublo ignimbrites. The chemical composition of melt inclusions indicates that the original melt prior to the eruptions that formed the ignimbritic Roque Nublo deposits was phonolitic in composition.
URI: http://hdl.handle.net/10553/53937
ISSN: 0935-1221
DOI: 10.1127/ejm/5/1/0097
Source: European Journal Of Mineralogy [ISSN 0935-1221], v. 5 (1), p. 97-106
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