Title
A comparison of the Iberian and Ebro Basins during the Permian and Triassic, eastern Spain: A quantitative subsidence modelling approach
Author
Vargas, H.
Gaspar-Escribano, J.M.
López-Gómez, J.
van Wees, J.-D.
Cloetingh, S.
de la Horra, R.
Arche, A.
Publication year
2009
Abstract
The Permian-Triassic sediments of the Iberian Plate are a well studied case of classical Buntsandstein-Muschelkalk-Keuper facies, with good sedimentological interpretations and precise datings based on pollen and spore assemblages, ammonoids and foraminifera. Synrift-postrift cycles are recorded in these facies, but there are only a few studies of quantitative subsidence analysis (backstripping method) and only a previous one using forward modelling for the quantification of synrift-postrift phases of this period. Here we present the results obtained by the quantitative analysis of fourteen field sections and oil-well electric log records in the Iberian and Ebro Basins, Spain. Backstripping analysis showed five synrift phases of 1 to 3 million years duration followed by postrift periods for the Permian-Triassic interval. The duration, however, shows lateral variations and some of them are absent in the Ebro Basin. The forward modelling analysis, assuming local isostatic compensation, has been applied to each observation point using one-layer and two-layer lithospheric configurations. The second one shows a better fit between observation and model prediction in a systematic way, so a two layer configuration is assumed for the sedimentary basin filling analysis. Lithospheric stretching factors β and δ obtained in the forward modelling analysis are never higher than 1.2, but sometimes β < 1 and simultaneously δ > 1 in the same section. If surficial extension is compensated by deep compression either at the roots of the rift basins or in far-away zones is not yet clear, but this anomaly can be explained using a simple shear extensional model for the Iberian and Ebro basins. © 2008 Elsevier B.V. All rights reserved.
Subject
Backstripping
Extensional basins
Forward modeling
Subsidence analysis
Ammonoids
Backstripping
Ebro basin
Extensional basins
Forward modeling
Forward modelling
Isostatic compensation
Lateral variations
Lithospheric
Model prediction
Observation point
Permian
Quantitative analysis
Rift basin
Sedimentary basin
Sedimentological interpretations
Simple shear
Syn-rift
Triassic
Triassic sediments
Two layers
Oil wells
Sedimentology
Sediments
Subsidence
comparative study
compression
extensional tectonics
facies analysis
forward modeling
isostasy
Permian
quantitative analysis
rifting
sedimentary basin
sedimentary sequence
sedimentology
subsidence
Triassic
Ebro Basin
Eurasia
Europe
Iberian Basin
Iberian Peninsula
Southern Europe
Spain
Ammonoidea
Foraminifera
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http://resolver.tudelft.nl/uuid:68dc32c6-07b2-4cba-88af-aef9e087e19c
DOI
https://doi.org/10.1016/j.tecto.2008.06.005
TNO identifier
241724
ISSN
0040-1951
Source
Tectonophysics, 474 (1-2), 160-183
Document type
article