INTRODUCTION The studied lamprophyric magmatism is present in the Subbetic Zone of the Betic Cordilleras (Fig. 1). This zone is characterized by different tectonic units mainly made up of sedimentary series (Triassic to Quaternary), which overlie the basement of the Spanish Central System. The Mesozoic Subbetic series is mainly comprised of sedimentary rocks and numerous submarine basaltic flows plus small subvolcanic dolerite bodies (Fig. 1). This magmatism changed from tholeiitic at the beginning of the Upper Triassic to transitional and alkaline sodic throughout the Jurassic, continuing intermittently until the Upper Cretaceous (Puga et al., 1988, 1989; Portugal Ferreira et al., 1995; Morata et al., 1997; Molina et al. 1998). Within this context, a small subvolcanic body of lamprohyric rocks (star in Fig. 1) was found within the Antequera Trias unit. As far as we know, this is the only example of this rock type in the whole Subbetic Zone and throughout the entire Betic Cordillera. The aims of this study are: 1) to characterize the lamprophyres from a petrological ang geochemical point rocks are more similar to the Permian alkaline lamprophyres in the Spanish Central System than to the Mesozoic dolerites and basalts widespread throughout the Subbetic Zone. We propose that the Cerro Prieto subvolcanic event represents the onset of a widespread magmatic phase induced by the post-Hercynian extensional tectonic activity that also affected the whole South-Iberian Paleomargin, within a geodynamic context that ultimately led to the opening of the Atlantic and the Neotethys oceans, accompanied by intrusion of basic magmas along their continental margins.

First evidence of lamprophyric magmatism within the Subbetic Zone (Southern Spain)

BECCALUVA, Luigi;BIANCHINI, Gianluca;
2010

Abstract

INTRODUCTION The studied lamprophyric magmatism is present in the Subbetic Zone of the Betic Cordilleras (Fig. 1). This zone is characterized by different tectonic units mainly made up of sedimentary series (Triassic to Quaternary), which overlie the basement of the Spanish Central System. The Mesozoic Subbetic series is mainly comprised of sedimentary rocks and numerous submarine basaltic flows plus small subvolcanic dolerite bodies (Fig. 1). This magmatism changed from tholeiitic at the beginning of the Upper Triassic to transitional and alkaline sodic throughout the Jurassic, continuing intermittently until the Upper Cretaceous (Puga et al., 1988, 1989; Portugal Ferreira et al., 1995; Morata et al., 1997; Molina et al. 1998). Within this context, a small subvolcanic body of lamprohyric rocks (star in Fig. 1) was found within the Antequera Trias unit. As far as we know, this is the only example of this rock type in the whole Subbetic Zone and throughout the entire Betic Cordillera. The aims of this study are: 1) to characterize the lamprophyres from a petrological ang geochemical point rocks are more similar to the Permian alkaline lamprophyres in the Spanish Central System than to the Mesozoic dolerites and basalts widespread throughout the Subbetic Zone. We propose that the Cerro Prieto subvolcanic event represents the onset of a widespread magmatic phase induced by the post-Hercynian extensional tectonic activity that also affected the whole South-Iberian Paleomargin, within a geodynamic context that ultimately led to the opening of the Atlantic and the Neotethys oceans, accompanied by intrusion of basic magmas along their continental margins.
2010
Puga, E.; Beccaluva, Luigi; Bianchini, Gianluca; Díaz De Federico, A.; Díaz Puga, M. A.; Alvarez Valero, A.; Galindo Zaldívar, J.; Wijbrans, J. R.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1377675
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