El complejo intrusivo diorítico-gabroico de Susqueda (Macizo del Montseny–Guilleries, Cataluña): unidades litológicas y características petrográficas
The intrusive complex of Susqueda constitutes the biggest association of plutonic mafic rocks of the Catalonian Coastal Ranges. It is located in the contact between the large calc-alkaline granitoid intrusions and the Paleozoic country rocks affected by Hercynian regional metamorphism. Intrusive rel...
| Autores: | , , , , , |
|---|---|
| Formato: | artículo |
| Fecha de publicación: | 2016 |
| País: | España |
| Recursos: | Universidad de Huelva (UHU) |
| Repositorio: | Arias Montano. Repositorio Institucional de la Universidad de Huelva |
| Idioma: | español |
| OAI Identifier: | oai:ariasmontano.uhu.es:10272/13604 |
| Acesso em linha: | http://hdl.handle.net/10272/13604 |
| Access Level: | acceso abierto |
| Palavra-chave: | Susqueda intrusion Hornblende gabbro Olivine hornblendite Diorite Hercynian Intrusión de Susqueda Gabro hornbléndico Hornblendita olivínica Diorita Herciniano |
| Resumo: | The intrusive complex of Susqueda constitutes the biggest association of plutonic mafic rocks of the Catalonian Coastal Ranges. It is located in the contact between the large calc-alkaline granitoid intrusions and the Paleozoic country rocks affected by Hercynian regional metamorphism. Intrusive relationships denote contemporaneity of basic magmas and, at least, an acid magma intrusion. A significant part of the outcrop consists of a heterogeneous mixing zone between the two magmas (mingling). The intrusion is made up of two oval-shaped outcrops about 3 km long, elongated in the N–S direction and separated by a NW–SE fault. In these units, the compositions of the plutonic rocks range from quartz diorites and tonalites (in the mixing zones) up to olivine hornblendites. Even though its distribution is quite heterogeneous, a preliminary cartography was made including the different petrographic types in three main groups: 1) hornblende gabbros and olivine hornblendites; 2) biotite-hornblende diorites; and 3) heterogeneous mixing zone between hornblende-biotite quartz diorite, granodiorite, and tonalite. The predominant mineral composition consists of plagioclase and amphibole, typical of dioritic rocks. Nevertheless, in a great part of the outcrop the plagioclase widely exceeds the 50% in An, typical of gabbroic rocks |
|---|