Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/53939
DC FieldValueLanguage
dc.contributor.authorPérez-Torrado, F. J.en_US
dc.contributor.authorMartí, J.en_US
dc.contributor.authorQueralt, I.en_US
dc.contributor.authorMangas, J.en_US
dc.contributor.otherQueralt, Ignasi-
dc.contributor.otherPerez-Torrado, Francisco Jose-
dc.contributor.otherMarti, Joan-
dc.date.accessioned2019-02-04T18:54:42Z-
dc.date.available2019-02-04T18:54:42Z-
dc.date.issued1995en_US
dc.identifier.issn0377-0273en_US
dc.identifier.urihttp://hdl.handle.net/10553/46945-
dc.description.abstractThe non-welded, lithic-rich ignimbrites of Roque Nublo are the most characteristic deposits of the second magmatic cycle (Pliocene in age) on Gran Canaria. They are very heterogeneous, with 35–55% by volume of lithic clasts, 15–30% of moderately vesiculated pumice, 5–7% of crystals and 20–30% of ash matrix. The juvenile components (pumice fragments and ash matrix) are largely altered. The mineral assemblage that originated by the alteration of vitric components consists mainly of zeolites (chabazite, phillipsite and analcime) and subordinate smectites. The alteration does not show any lateral or vertical gradation in the deposits and does not change in intensity with respect to the distance from the emission center. These alteration processes affect only the Roque Nublo ignimbrites; their associated fall and surge deposits remain unaltered. A geo-autoclave mechanism is proposed to explain the alteration processes, which devitrified the juvenile components of the Roque Nublo ignimbrites and gave the rocks their characteristic strong induration. This implies that the eruptions which led to the formation of the Roque Nublo ignimbrites had an important phreatomagmatic component, and that the resulting pyroclastic flows were too dense and too poorly expanded to permit the water vapour to be separated from the vitric fragments during transport. The alteration took place in situ and immediately after the deposition of the deposits when they were still hot, by the reaction between the vitric components and the condensed vapour, and cannot be attributed to late diagenesis or weathering.en_US
dc.languageengen_US
dc.publisher0377-0273-
dc.relation.ispartofJournal of Volcanology and Geothermal Researchen_US
dc.sourceJournal Of Volcanology And Geothermal Research [ISSN 0377-0273], v. 65 (3-4), p. 191-204en_US
dc.subject250621 Vulcanologíaen_US
dc.subject.otherRoque Nublo ignimbritesen_US
dc.subject.otherGran Canaria (Islas Canarias)en_US
dc.titleAlteration processes of the Roque Nublo ignimbrites (Gran Canaria, Canary Islands)en_US
dc.typeinfo:eu-repo/semantics/Articleen_US
dc.typeArticleen_US
dc.identifier.doi10.1016/0377-0273(94)00115-Wen_US
dc.identifier.scopus0028808506-
dc.identifier.isiA1995RE36800003-
dcterms.isPartOfJournal Of Volcanology And Geothermal Research-
dcterms.sourceJournal Of Volcanology And Geothermal Research[ISSN 0377-0273],v. 65 (3-4), p. 191-204-
dc.contributor.authorscopusid6602207526-
dc.contributor.authorscopusid7202923564-
dc.contributor.authorscopusid6601995575-
dc.contributor.authorscopusid56114334400-
dc.description.lastpage204-
dc.identifier.issue3-4-
dc.description.firstpage191-
dc.relation.volume65-
dc.investigacionCienciasen_US
dc.type2Artículoen_US
dc.contributor.daisngid1111499-
dc.contributor.daisngid159261-
dc.contributor.daisngid368255-
dc.contributor.daisngid1765426-
dc.identifier.investigatorRIDF-5693-2014-
dc.identifier.investigatorRIDN-9727-2018-
dc.identifier.investigatorRIDL-4203-2014-
dc.utils.revisionen_US
dc.contributor.wosstandardWOS:PEREZTORRADO, FJ
dc.contributor.wosstandardWOS:MARTI, J
dc.contributor.wosstandardWOS:QUERALT, I
dc.contributor.wosstandardWOS:MANGAS, J
dc.date.coverdateMayo 1995
dc.identifier.ulpgces
dc.description.scieSCIE
item.fulltextSin texto completo-
item.grantfulltextnone-
crisitem.author.deptGIR IUNAT: Geología de Terrenos Volcánicos-
crisitem.author.deptIU de Estudios Ambientales y Recursos Naturales-
crisitem.author.deptDepartamento de Física-
crisitem.author.deptGIR IOCAG: Geología Aplicada y Regional-
crisitem.author.deptIU de Oceanografía y Cambio Global-
crisitem.author.deptDepartamento de Física-
crisitem.author.orcid0000-0002-4644-0875-
crisitem.author.orcid0000-0002-3286-743X-
crisitem.author.parentorgIU de Estudios Ambientales y Recursos Naturales-
crisitem.author.parentorgIU de Oceanografía y Cambio Global-
crisitem.author.fullNamePérez Torrado, Francisco José-
crisitem.author.fullNameMangas Viñuela, José-
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