Publication: El Jurásico Medio de la Cuenca Catalana : unidades litoestratigráficas y elementos paleogeográficos
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Publication Date
1996
Authors
Aurell, Marcos
Henriques, Maria Helena Paiva
Meléndez, Guillermo
Suárez Vega, Luis Carlos
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Sociedad Española de Paleontología
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Abstract
Se reconstruyen las variaciones de facies y la configuración paleogeográfica de la Cuenca Catalana durante el Jurásico Medio, a partir de los datos obtenidos en afloramientos y sondeos. Se propone un nuevo sistema de unidades litoestratigráficas, válido para la Cuenca Catalana, y se analizan sus equivalencias con las unidades identificadas en la Cordillera Ibérica y en Mallorca. Un sistema de fallas arqueadas, con trazado lístrico y con sentido descendente hacia el Mediterráneo, debió contribuir a la diferenciación de la Plataforma subsidente de Tortosa. Desde el punto de vista paleobiogeográfico destacan las semejanzas taxonómicas que muestran las asociaciones registradas de ammonites y braquiópodos en la Plataforma de Tortosa respecto a
las de otras cuencas epicontinentales europeas. La Cuenca Catalana y Mallorca debieron ser dos dominios geográficamente separados y aislados uno de otro, con vías de dispersión biogeográfica y tafonómica diferentes, durante el Jurásico Medio. En la Cuenca Catalana se desarrollaron secciones expandidas en facies de plataforma abierta durante el Biocrón Garantiana (Bajociense Superior), cuando la cuenca alcanzó los valores batimétricos máximos y actuó como un área de expansión biogeográfica para algunos grupos taxonómicos característicos del Tethys occidental.
The palaeogeography and facies distribution of the Catalan Basin during the Middle Jurassic are reconstructed, on the basis of outcrops and logs data. A new lithostratigraphic classification valid for the Catalan Basin is defined and its equivalence with the correlative units in the lberian Basin and Majorca is discussed. A system of arched, listric-shaped faults dipping towards the Mediterranean sea was a major factor determining the differentiation of the subsident Platform of Tortosa. From a palaeobiogeographical point of view, the ammonite and brachiopod recorded associations from the Platform of Tortosa are taxonornically similar to the associations of the epicontinental European basins. The Catalan Basin and Majorca were two geographically separate areas, maintaining separate biogeographical and taphonomic dispersal ways in the Middle Jurassic. Yet in the Catalan Basin expanded, outer shelf sections were developed during the Garantiana Biochron (Upper Bajocian). During this episode the basin reached the maximum bathymetric values and acted as a biogeographical dispersal area for some taxonomic groups characteristic of the West-Tethys.
The palaeogeography and facies distribution of the Catalan Basin during the Middle Jurassic are reconstructed, on the basis of outcrops and logs data. A new lithostratigraphic classification valid for the Catalan Basin is defined and its equivalence with the correlative units in the lberian Basin and Majorca is discussed. A system of arched, listric-shaped faults dipping towards the Mediterranean sea was a major factor determining the differentiation of the subsident Platform of Tortosa. From a palaeobiogeographical point of view, the ammonite and brachiopod recorded associations from the Platform of Tortosa are taxonornically similar to the associations of the epicontinental European basins. The Catalan Basin and Majorca were two geographically separate areas, maintaining separate biogeographical and taphonomic dispersal ways in the Middle Jurassic. Yet in the Catalan Basin expanded, outer shelf sections were developed during the Garantiana Biochron (Upper Bajocian). During this episode the basin reached the maximum bathymetric values and acted as a biogeographical dispersal area for some taxonomic groups characteristic of the West-Tethys.