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GEOREF RECORD

Tethyan versus Iberian extension during the Cretaceous period in the eastern Iberian Peninsula; insights from magnetic fabrics

C. Garcia-Lasanta, T. Roman-Berdiel, B. Oliva-Urcia, A. M. Casas, I. Gil-Pena, F. Speranza and T. Mochales
Tethyan versus Iberian extension during the Cretaceous period in the eastern Iberian Peninsula; insights from magnetic fabrics
Journal of the Geological Society of London (January 2016) 173 (1): 127-141

Abstract

This work investigates how anisotropy of magnetic susceptibility (AMS) recorded the strain related to the Early Cretaceous extensional processes in synrift sediments of the Maestrat basin (eastern Spain). Forty-two sites, distributed throughout the Lower Cretaceous sequence with dominant gentle dips, were sampled. Minerals contributing to the AMS are mainly phyllosilicates. The parallelism between magnetic and sedimentary foliation seems to indicate that a primary (synsedimentary and early diagenetic) magnetic fabric was preserved at 84% of sites. Consequently, preferred orientations of magnetic lineations are interpreted to record the effect of extensional processes coeval with sedimentation and diagenesis during this period. At these 35 sites, two main magnetic lineation orientations are found, delimiting two large domains: a NE-SW orientation prevailing in the NW sector of the basin (parallel to the extension direction of the Iberian basin), and NW-SE to NNW-SSE orientations to the SE (parallel to the extension direction controlling the western Tethys margin). Directional variability demonstrates that the Maestrat basin is located at the boundary between two domains (Iberian and Tethyan) undergoing different plate-scale extensional processes. The subsequent Cenozoic tectonic inversion affected the synsedimentary magnetic fabrics at only a few sites at the borders of the basin, where compressive features are more developed.


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 173
Serial Issue: 1
Title: Tethyan versus Iberian extension during the Cretaceous period in the eastern Iberian Peninsula; insights from magnetic fabrics
Affiliation: Universidad de Zaragoza, Departamento de Ciencias de la Tierra, Saragossa, Spain
Pages: 127-141
Published: 201601
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 68
Accession Number: 2016-025780
Categories: StratigraphyStructural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. strat. col., 3 tables, geol. sketch maps
N40°19'60" - N40°40'00", W00°19'60" - E00°19'60"
Secondary Affiliation: Universidad Autonoma de Madrid, ESP, SpainInstituto Geologico y Minero de Espana, ESP, SpainIstituto Nazionale di Geofisica e Vulcanologia, ITA, Italy
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201613
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