Transition from extensional to compressional magnetic fabrics in the Cretaceous Cabuérniga basin (North Spain)

Oliva‐Urcia, Belén; Román‐Berdiel, Teresa; Sáinz, Antonio María Casas; Bógalo, María Felicidad; Osácar, María Cinta; García‐Lasanta, Cristina

doi:10.1016/j.jsg.2012.09.001

Cited by 36 publications

(25 citation statements)

References 48 publications

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“…Therefore, for this site, together with the neighbouring sites BE5 and BE7, magnetic fabrics are interpreted as modified by the compressional stage (see discussion below). This interpretation agrees with previous results in the Cabuérniga basin (Oliva-Urcia et al 2013), where even in absence of clear structural markers of compressional deformation (no cleavage is present), a 'modified extensional magnetic fabric' can be interpreted between extensional (inherited from the extensional stage) and compressional (clearly defined when cleavage is present and resulting from the modification during inversion) magnetic fabrics. Northwards of BE5, BE6 and BE7, the two sites located in the eastern flank of the Bobalar anticline (MO15 and MO19) do not show a girdle containing k int and k min , but their magnetic lineations are oriented approximately parallel to the fold trend.…”

Section: Magnetic Fabric Originsupporting

confidence: 92%

“…Hirt & Gehring 1991;Lüneburg et al 1999) and measured in the KLY-3S Kappabridge susceptometer. This technique gives repeatable results (Oliva-Urcia et al 2010a,b, 2013García-Lasanta et al 2014). By determining the LT/RT susceptibility ratio, as well as by comparing the orientation results of LT and RT magnetic ellipsoids, we can understand the influence of different mineral phases in the magnetic fabric orientation.…”

Section: Amsmentioning

confidence: 99%

“…The use of indirect techniques such as magnetic fabric analysis becomes essential when a complex deformation history makes difficult the direct characterization of consecutive deformation events (e.g. Soto et al 2007Soto et al , 2008Oliva-Urcia et al 2010a,b, 2013García-Lasanta et al 2014).…”

mentioning

confidence: 99%

“…These parameters include magnetic mineralogy, sedimentary conditions and tectonic overprinting of subsequent tectonic stages on the primary fabric (e.g. Parés et al 1999;Soto et al 2007Soto et al , 2008Oliva-Urcia et al 2013).…”

mentioning

confidence: 99%

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

García‐Lasanta

Román‐Berdiel

Oliva‐Urcia

et al. 2015

JGS

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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. Received

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Section: Magnetic Fabric Originsupporting

confidence: 92%

Section: Amsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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

García‐Lasanta

Román‐Berdiel

Oliva‐Urcia

et al. 2015

JGS

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“…Borradaile and Jackson, 2004), except in particular cases when shear deformation is associated with thrust sheets and a mixture of magnetic susceptibility carriers (Frizon de Lamotte, 2002;Oliva-Urcia et al, 2009). Deformational processes due to subsequent tectonic stages may occasionally mask or even completely modify the primary fabric, whereby the degree of this distortion is related directly to the amount of the subsequent deformation and its P-T conditions (Mattei et al, 1997;Oliva-Urcia et al, 2013;Parés et al, 1999;Soto et al, 2007Soto et al, , 2008.…”

Section: Introductionmentioning

confidence: 99%

Evidence for the Permo-Triassic transtensional rifting in the Iberian Range (NE Spain) according to magnetic fabrics results

et al. 2015

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Anisotropy of magnetic susceptibility (AMS) techniques are applied to Permo-Triassic red beds from the Castilian Branch (Iberian Range, NE Spain) that were deposited in an extensional basin inverted during Cenozoic times. The main goal of this work is to characterize the tectonic evolution of the basinal stage by differentiating synsedimentary to early diagenetic magnetic fabrics from the secondary tectonic fabrics related to compression, which are scarcely developed because no penetrative structures related to compression have been recognized. Oblate magnetic fabrics, with k(min) axes perpendicular to bedding,are observed in most cases. Magnetic lineations are variable, showing a dominant ENE-WSW maximum, which fits with a dextral transtensional regime acting on NW-SE master faults during the Triassic. We propose that variations in the orientation of the magnetic lineation are associated with transfer faults which fragment the basin and trigger strain partitioning in different areas. Magnetic fabrics are locally modified by Cenozoic compression, with intermediate and minimum axes distributed along girdles perpendicular to fold axes. Comparing all these results with macrostructures and mesostructural kinematic indicators, we conclude that the fine-grained hematite-bearing rocks carry a consistent magnetic fabric which can be used to reconstruct the basin history. (C) 2015 Elsevier B.V. All rights reserved

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Improving the method of low‐temperature anisotropy of magnetic susceptibility (LT‐AMS) measurements in air

Issachar

Levi

Lyakhovsky

et al. 2016

Geochem Geophys Geosyst

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This study examines the limitations of the method of low‐temperature anisotropy of magnetic susceptibility (LT‐AMS) measurements in air and presents technical improvements that significantly reduce the instrumental drift and measurement errors. We analyzed the temperature profile of porous chalk core after cooling in liquid nitrogen and found that the average temperature of the sample during the LT‐AMS measurement in air is higher than 77K and close to 92K. This analysis indicates that the susceptibility of the paramagnetic minerals are amplified by a factor ∼3.2 relative to that of room temperature AMS (RT‐AMS). In addition, it was found that liquid nitrogen was absorbed in the samples during immersing and contributed diamagnetic component of ∼−9 × 10−6 SI to the total mean susceptibility. We showed that silicone sheet placed around and at the bottom of the measuring coil is an effective thermal protection, preventing instrument drift by the cold sample. In this way, the measuring errors of LT‐AMS reduced to the level of RT‐AMS, allowing accurate comparison with standard AMS measurements. We examined the applicability of the LT‐AMS measurements on chalk samples that consist <5% (weight) of paramagnetic minerals and showed that it helps to efficiently enhance the paramagnetic fabric. The present study offers a practical approach, which can be applied to various types of rocks to better delineate the paramagnetic phase using conventional equipment.

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Transition from extensional to compressional magnetic fabrics in the Cretaceous Cabuérniga basin (North Spain)

Cited by 36 publications

References 48 publications

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

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

Evidence for the Permo-Triassic transtensional rifting in the Iberian Range (NE Spain) according to magnetic fabrics results

Improving the method of low‐temperature anisotropy of magnetic susceptibility (LT‐AMS) measurements in air

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