| TAZ-TFG-2022-3425 |
Análisis sedimentológico y secuencial del Muschelkalk superior de Nueno (Huesca, Sierras exteriores)
Scofield Teruel, David
Bádenas Lago, Beatriz (dir.) ; Aurell Cardona, Marcos (dir.)
Universidad de Zaragoza,
CIEN,
2022
Graduado en Geología
Resumen: The upper Muschelkalk exposed North of Nueno (Sierras Exteriores, south Pyrenees) is a Middle Triassic (upper Ladinian) unit comprised of at least 74 m of predominantly muddy limestones and local marls, which have been interpreted as coastal to shallow marine carbonates, including supra-intertidal, protected subtidal, internal bars and open subtidal sub-environments.
The upper Muschelkalk shows a well-defined sequential arrangement composed of multiple 5-10-metre-thick shallowing-upward sequences. The lower part of the unit consists of 45.5 m of well-bedded (m-thick) grey carbonates, and includes 5 (or 6) sequences dominated by subtidal (open to protected) facies. The upper part of the unit is a 26 m-thick succession dominated by thinly bedded (dm-to cm-thick) limestones, marly limestones and marls, arranged in 4 sequences, including subtidal(open, sediment bars, and protected facies) and supra-intertidal facies. Therefore, this evolution suggests a long-term shallowing of the depositional system for the entire upper Muschelkalk unit, that ends with the Keuper facies.
The Muschelkalk facies in the Pyrenean basin have been interpreted as a carbonate ramp deposits, formed in a supratital to subtidal marine environment (Calvet et al., 2004) which is completely coherent with the results presented in this study. Previous studies on the Pyrenean Muschelkalk in the Basque Pyrenees and in the Catalán domain, allowed the identification of three different informal lithological units: “marly dolomites”, “grey limestones”, and “thin-bedded limestones and dolomites” (Calvet et al., 2004; López-Gómez et al., 2019). In the Nueno area, we have correlated the two
identified units with the “Grey limestones”, and with the “thin bedded limestones and dolomites” respectively. The lowermost unit of marly dolomites is probably not exposed in the studied locality.
The overall thickness of the upper Muschelkalk in the Nueno area is slightly larger than in the nearby areas, as the entire Muschelkalk reaches maximum thickness of 70 m in the Basque outcrops, and of 80 m in the Nogueres area (Calvet et al., 2004).
The upper Muschelkalk shows a well-defined sequential arrangement composed of multiple 5-10-metre-thick shallowing-upward sequences. The lower part of the unit consists of 45.5 m of well-bedded (m-thick) grey carbonates, and includes 5 (or 6) sequences dominated by subtidal (open to protected) facies. The upper part of the unit is a 26 m-thick succession dominated by thinly bedded (dm-to cm-thick) limestones, marly limestones and marls, arranged in 4 sequences, including subtidal(open, sediment bars, and protected facies) and supra-intertidal facies. Therefore, this evolution suggests a long-term shallowing of the depositional system for the entire upper Muschelkalk unit, that ends with the Keuper facies.
The Muschelkalk facies in the Pyrenean basin have been interpreted as a carbonate ramp deposits, formed in a supratital to subtidal marine environment (Calvet et al., 2004) which is completely coherent with the results presented in this study. Previous studies on the Pyrenean Muschelkalk in the Basque Pyrenees and in the Catalán domain, allowed the identification of three different informal lithological units: “marly dolomites”, “grey limestones”, and “thin-bedded limestones and dolomites” (Calvet et al., 2004; López-Gómez et al., 2019). In the Nueno area, we have correlated the two
identified units with the “Grey limestones”, and with the “thin bedded limestones and dolomites” respectively. The lowermost unit of marly dolomites is probably not exposed in the studied locality.
The overall thickness of the upper Muschelkalk in the Nueno area is slightly larger than in the nearby areas, as the entire Muschelkalk reaches maximum thickness of 70 m in the Basque outcrops, and of 80 m in the Nogueres area (Calvet et al., 2004).
Tipo de Trabajo Académico: Trabajo Fin de Grado
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Trabajos académicos > Trabajos Académicos por Centro > Facultad de Ciencias
Trabajos académicos > Trabajos fin de grado