Publication: Pórfidos y diques básicos asociados en la Sierra de Guadarrama
Loading...
Official URL
Full text at PDC
Publication Date
1985
Authors
Advisors (or tutors)
Editors
Journal Title
Journal ISSN
Volume Title
Publisher
Seminario de Estudos Galegos. Area de Xeoloxía e Minería ; Instituto Universitario de Xeoloxía "Isidro Parga Pondal"
Citations
Exportar
Abstract
En el dominio central de la Sierra de Guadarrama aparecen diques de rocas porfídicas que se disponen formando enjambres de algo más de media docena de diques subparalelos. Los aspectos cartográficos y petrográficos de estos haces filonianos permiten establecer dos grandes grupos de rocas porfídicas:
1.- Diques de direcci6n predominantemente E-W o N-S y composiciones que varian desde términos dioríticos a tipos graníticos s.s. Estas rocas aparecen dispuestas en cuatro haces principales. Petrográficamente definen una cierta se cuencia calcoalcalina granodiorítica, aunque hasta el momento no se puede asegurar si existe algún tipo de relación cogenética entre los términos más extremos.
2.- Diques de direcci6n NE-SW constante y de composición cuarzodiorítica a cuarzomonzonítica. Afloran exclusivamente en el sector central del área estudiada y su emplazamiento es más moderno que el sistema filoniano anteriormente descrito, al cual cortan en diversos puntos
Porphyry dykes are widespread in the central part of the Sierra de Guadarrama (Spanish Central System). They form long distance swarms, consisting as a rule of sorne half dozen subparallel in dividuals. Two groups can be distinguished on cartographic and petrographic grounds: 1.- Dykes with prevailing E-W and N-S directions and compositions ranging from diorite to granite s.s. Petrographic compositions plot close to a grano dioritic calcalkaline trend. Howeverwith the data avalaible today, cogenetism between end member types cannot be undoubtly established. Four principal swarms have been distinguished. 2.- Dykes of constant NE-SW direction, quartzdioritic to quartzmonzonitic in composition. They are only found in the central part of the studied area and are younger that the formez group. Cross-cutting relationships between both groups have been found at several places
Porphyry dykes are widespread in the central part of the Sierra de Guadarrama (Spanish Central System). They form long distance swarms, consisting as a rule of sorne half dozen subparallel in dividuals. Two groups can be distinguished on cartographic and petrographic grounds: 1.- Dykes with prevailing E-W and N-S directions and compositions ranging from diorite to granite s.s. Petrographic compositions plot close to a grano dioritic calcalkaline trend. Howeverwith the data avalaible today, cogenetism between end member types cannot be undoubtly established. Four principal swarms have been distinguished. 2.- Dykes of constant NE-SW direction, quartzdioritic to quartzmonzonitic in composition. They are only found in the central part of the studied area and are younger that the formez group. Cross-cutting relationships between both groups have been found at several places