Estratigrafía y tectónica del Triásico Sudibérico al sureste de Calasparra (Murcia)

Abstract

This paper shows the stratigraphy and tectonics of the epicontinental Triassic rocks outcropping to the southeast of Calasparra (Murcia). These sediments were deposited during the Triassic on the southern continental margin of the Iberian plate (Triásico Sudibérico). Fieldwork has enabled the characterization of various lithostratigraphic units in this area. Buntsandstein (Lower Detritic Unit), Muschelkalk and Keuper facies (K1, K2, K3 Y K4-K5 Units) have been identified, as well as carbonates of the Zamoranos Formation (Norian). Keuper facies units have been correlated with those defined by Pérez-López (1991) in the central sector of the Betic Cordillera, of Carnian age. The Muschelkalk facies unit, which has Ladinian fossils, has been correlated with the Majanillos Formation from the central sector of the Cordillera. A clayed gypsum unit (gypsum unit) has been identified in which diapiric facies (brecciated gypsums) are mixed with facies redeposited during the Miocene (megabreccia). The tectonics of the Triassic rocks constituting the outcrop have been studied, as well as the relations between these rocks and the Cretaceous and Tertiary rocks outcropping nearby. This study shows that both halokinesis and resedimentation mechanisms have influenced the present-day geological structure of the outcrop. These two processes have produced diapiric and olistostromic facies, which have brought about the Gypsum Unit composed of brecciated gypsums and megabreccia.