Por favor, use este identificador para citar o enlazar a este item:
http://hdl.handle.net/10261/3128
COMPARTIR / EXPORTAR:
SHARE CORE BASE | |
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL | DATACITE | |
Título: | Peralkaline Acid Tendencies in Gran Canaria. (Canary Island) |
Autor: | Araña, Vicente CSIC; Rodríguez Badiola, Eduardo CSIC; Hernán, Francisco | Palabras clave: | Alkaline Peralkaline rocks Phonolitic lavas Ignimbritic trachytes Gran Canaria Canary Islands |
Fecha de publicación: | mar-1973 | Editor: | Springer Nature | Citación: | Contributions to Mineralogy and Petrology, Volume 40, Number 1 / marzo de 1973, pp. 53-62 | Resumen: | The study of a volcanic series from the island of Gran Canaria (Canary Islands) in which alkaline and peralkaline, saturated and undersaturated rocks coexist, is reported here. Materials with high volatile content (ignimbritic trachytes) were first emitted and the series ended with the eruption of phonolitic lavas. The average peralkalinity index in these rocks is typically about 1.0 and, therefore, peralkaline rocks coexist with non-peralkaline ones. However, a maximum in peralkalinity is found in the ignimbritic rocks of the lower part of the series. In spite of the evident acid peralkaline tendencies of these rocks, it does not seem appropriate to classify them as pantellerites or comendites. Nor are they consistent with the genetic processes proposed for rocks of similar composition and oceanic environment. The crystallization of the feldspars controls the variation trends among the different magmas but the fractionation alone does not sufficiently explain the genesis of successive fluids. Various factors seem to point to the important role which a gas-transfer process causing a geochemical stratification inside the magmatic chamber may have played. The occurrence of peralkaline silicics at Gran Canaria, which is located for away from the active Mid-Atlantic ridge, is not related to transitional basalts. These rocks are a deviation from the main undersaturated alkalic trend which characterizes the volcanism of the Canary Islands, their genesis being related to the realization of favourable local volcanic conditions. | Descripción: | The original publication is available at www.springerlink.com | URI: | http://hdl.handle.net/10261/3128 | DOI: | 10.1007/BF00371763 | ISSN: | 0010-7999 |
Aparece en las colecciones: | (MNCN) Artículos |
Mostrar el registro completo
CORE Recommender
SCOPUSTM
Citations
7
checked on 17-abr-2024
WEB OF SCIENCETM
Citations
7
checked on 27-feb-2024
Page view(s)
356
checked on 18-abr-2024
Google ScholarTM
Check
Altmetric
Altmetric
NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.