Publication: Diques lamprofíricos norteados con facies brechoidales eruptivas en la región de La Paramera de Ávila (Sistema Central Español)
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1982
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Seminario de Estudos Galegos. Area de Xeoloxía e Minería ; Instituto Universitario de Xeoloxía "Isidro Parga Pondal"
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Abstract
Según direcciones N-S afloran diques diabásicos y lamprof1ricos en los sectores centrales del Sistema Central, estos últimos, muy localmente (Sierra de La Paramera), presentan facies brechoidales eruptivas que podrían explicarse como fenómenos de tipo diatrema, generados en un proceso de fluidización del magma lamprofírico. Los lamprófiros pueden considerarse términos alcalinos, en cuyas facies brechoidales engloban gran cantidad de xenolitos, tanto de las rocas encajantes (granitos, pórfidos graníticos, aplopegmatitas, ...), como de rocas esquistosas y granulíticas varias (charnockitas, granoblastitas de granate y rutilo, ... ), de niveles más profundos.
In the central part of the Sistema Central the lamprophyre dikes of N-S direction locally show (Sierra de La Paramera) an eruptive breccia facies that we explain by a fluidization process similar to diatreme types. This lamprophyres, alkaline in composition, contain a lot of xenoliths in that breccia facies. They are not also wall rocks xenoliths (granites, microgranites, aplopegmatites, ... ) but schistose and granulitic types (foliated or massives with charnockitic character, granoblastites with garnet and rutile, ...), from deeper levels.
In the central part of the Sistema Central the lamprophyre dikes of N-S direction locally show (Sierra de La Paramera) an eruptive breccia facies that we explain by a fluidization process similar to diatreme types. This lamprophyres, alkaline in composition, contain a lot of xenoliths in that breccia facies. They are not also wall rocks xenoliths (granites, microgranites, aplopegmatites, ... ) but schistose and granulitic types (foliated or massives with charnockitic character, granoblastites with garnet and rutile, ...), from deeper levels.