Latest Jurassic-Early Cretaceous synrift evolution of the Torrelapaja Subbasin (Cameros Basin) : implications for Northeast Iberia palaeogeography
Aurell, Marcos (Universidad de Zaragoza. Departamento de Ciencias de la Tierra. Grupo Aragosaurus-IUCA)
Bádenas, Beatriz (Universidad de Zaragoza. Departamento de Ciencias de la Tierra. Grupo Aragosaurus-IUCA)
Castanera, Diego (Institut Català de Paleontologia Miquel Crusafont)
Gasca, José M. (Universidad de Zaragoza. Departamento de Ciencias de la Tierra. Grupo Aragosaurus-IUCA)
Canudo, José Ignacio (Universidad de Zaragoza. Departamento de Ciencias de la Tierra. Grupo Aragosaurus-IUCA)
Laita, Elisa (Universidad de Zaragoza. Departamento de Ciencias de la Tierra. Grupo Aragosaurus-IUCA)
Liesa, Carlos L. (Universidad de Zaragoza. Departamento de Ciencias de la Tierra. Grupo Geotransfer)

Date:	2021
Abstract:	The reconstruction of the latest Jurassic-Early Cretaceous evolution of the Torrelapaja Subbasin (Cameros Basin, Spain) resulted in the characterization of three synrift sequences (SS-1, SS-2 and SS-3) bounded by major unconformities. Three major NW-SE normal faults combined with smaller scale faults of variable direction (around NE-SW) controlled the sedimentation. The complex geometry of the Torrelapaja Subbasin indicates a main extension direction of NE-SW, and a secondary NW-SE extension. Sedimentation of the Tithonian-middle Berriasian SS-1 occurred in alluvial fan systems, grading upwards to carbonate palustrine-lacustrine environments. A new vertebrate site with large size sauropod bones has been found in the middle part of SS-1. The lower boundary of the uppermost Hauterivian-lower Barremian SS-2 is locally a palaeokarst, with sedimentary infill including three new fossil sites with remains of ornithopod, sauropod and theropod dinosaurs. Sedimentation of SS-2 encompasses distal alluvial terrigenous facies with local palaeosoils and palustrine-lacustrine limestones grading upwards to middle-distal alluvial facies. After a late Barremian-early Albian stratigraphic gap, sedimentation resumed in coastal flat environments represented by the mudstones with intercalated skeletal (oyster-rich) sandy limestones with carbonaceous plant remains of the SS-3. A middle-late Albian age assignment of SS-3 based on regional correlation is supported by strontium isotopic data. This unit marks the first Early Cretaceous marine incursion in the area from the northern Atlantic realm. This is a notable change of the previous palaeogeographical reconstructions which established that the first marine encroachment occurred in the early Aptian and was sourced from Tethysian domains.
Grants:	Ministerio de Economía y Competitividad CGL2017-85038-P Ministerio de Ciencia e Innovación PID2019-108705GB-I00 Agència de Gestió d'Ajuts Universitaris i de Recerca BP2017-00195
Rights:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Lower Cretaceous ; Continental sedimentation ; Extensional tectonics ; Dinosaurs ; Palaeogeography ; Northeast Iberia
Published in:	Cretaceous research, Vol. 128 (December 2021) , art. 104997, ISSN 1095-998X

DOI: 10.1016/j.cretres.2021.104997

Postprint 65 p, 6.6 MB

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Research literature > UAB research groups literature > Research Centres and Groups (research output) > Experimental sciences > Institut Català de Paleontologia Miquel Crusafont (ICP)
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