Rasgos sedimentarios indicadores de inestabilidad causada por actividad tectónica sismogenética. Las cuencas neógenas de las minas de Hellín y Cenajo (Prebético Externo, SE de España)
- José P. Calvo 1
- Miguel A. Rodríguez-Pascua 2
- David Gómez-Gras 3
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1
Universidad Complutense de Madrid
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2
Instituto Geológico y Minero de España
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3
Universitat Autònoma de Barcelona
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ISSN: 0214-2708
Any de publicació: 2014
Volum: 27
Número: 1
Pàgines: 205-222
Tipus: Article
Altres publicacions en: Revista de la Sociedad Geológica de España
Resum
The sedimentary infilling of the Neogene basins of Las Minas de Hellín and Cenajo, in the External Prebetic Zone (SE Spain), shows a variety of features indicative of instability that resulted from seismogenetic tectonic activity. Soft-sediment deformation structures such as sand dikes, pillows, mushroom structures, mixed layers, disturbed varved lamination, and others are commonly recognised in the Neogene deposits and are interpreted as resulting from episodic seismic events (seismites). Redeposited beds reaching up meters to tens of meters in size are also recognised and interpreted as indicative of seismic shocks that affected the sedimentary infill of the basins. An additional feature deals with local occurrence of carbonate mounds interbedded with the sedimentary deposits of the Las Minas de Hellín Basin. The mounds consist mainly of highly lithified, strongly folded and fractured and locally replaced by silica carbonate beds that occur closely related to the main faults of the basin.