Basin infill architecture and evolution from magnetostratigraphic cross-basin correlations in the southeastern Pyrenean foreland basin

Taberner, C.; Dinarès-Turell, Jaume; Giménez, J.; Docherty, C.

doi:10.1130/0016-7606(1999)111<1155:biaaef>2.3.co;2

Cited by 47 publications

(43 citation statements)

References 34 publications

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“…AMS residing in magnetite will reflect a preferred grain shape orientation, whereas AMS due to phyllosilicates or hematite will be related to their preferred crystallographic orientation (which may or may not reflect a grain shape orientation). Existing paleomagnetic results on the Igualada Formation indicate that magnetite, and iron sulfides to a much lesser extent, are the main ferromagnetic contributors to the Natural Remanent Magnetization (NRM; Parés et al, 1988;Dinarès-Turell, 1992;Burbank et al, 1992;Taberner et al, 1998). Anhysteretic Remanent Magnetization (ARM) and low-temperature susceptibility experiments on our samples corroborate these results (Fig.…”

Section: Source Of the Magnetic Susceptibilitysupporting

confidence: 76%

“…Moreover, thin section analysis does not reveal significant new growth in the mudstones, nor pressure-solution. Geological evidence shows that the maximum depth of the studied Eocene mudrocks was less than 1000 m (Gimènez-Montsant and Salas, 1997; Taberner et al, 1998) and thus the P -T conditions are limited to diagenesis. At this depth, the sediments could have been only partially lithified when the deformation took place during the Eocene.…”

Section: A Mechanism For Grain-reorientationmentioning

confidence: 99%

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Evolution of magnetic fabrics during incipient deformation of mudrocks (Pyrenees, northern Spain)

1999

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The anisotropy of magnetic susceptibility (AMS) of Eocene mudrocks from the Southern Pyrenean Foreland Basin documents the progressive development of tectonic fabrics in sediments that mesoscopically show no evidence for deformation. Two end members are observed: (1) a strong oblate fabric, with strong clustering of the minimum axes of susceptibility that is characteristic of depositional and compaction processes; and (2) a prolate magnetic ellipsoid with moderate to strong minimum axes girdle that reflects weak cleavage in the mudrocks. Low-temperature experiments and anhysteretic remanent magnetization reveal that the paramagnetic fraction dominates the AMS signal and thus, represent the preferred orientation of phyllosilicates. Characteristic stages of magnetic fabrics in mudrocks can be established and thus the AMS can be used as an indicator of cleavage development and intensity in mudrocks. The three stages of fabric development (early deformation, pencil structure and weak cleavage) reflect a process of increasingly preferred crystallographic orientation of the phyllosilicates that is evidenced by the change of distribution of the minimum susceptibility axes. This is particularly evident in the eigenvalues, which we plot on a Woodcock diagram that describes both shape and fabric strength, and allows different stages of deformation to be distinguished. Because appreciable depth during deformation (elevated temperatures and high confining pressures) can be ruled out, we propose that the sediments were wet and only partly lithified when the phyllosilicates became progressively reoriented. Thus, the observed fabric is explained as a result of the close interaction of deformation and diagenetic processes. Tectonically induced deformational fabrics formed while diagenesis progressed. Although the study area is a foreland basin, it offers a valuable analogue to active accretionary wedges. The application of AMS in these settings, where sediments are progressively dewatered through the development of fabrics, permits a similar quantification of fabric development and, eventually, of deformation. © 1999 Elsevier Science B.V. All rights reserved.

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Section: Source Of the Magnetic Susceptibilitysupporting

confidence: 76%

Section: A Mechanism For Grain-reorientationmentioning

confidence: 99%

Evolution of magnetic fabrics during incipient deformation of mudrocks (Pyrenees, northern Spain)

1999

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“…Flexural modeling by Zoetemeo'er et al [1990] showed that this region could becorrespond to the autochthonous infill in front of the South Pyrenean thrust sheets and mainly consist of north and south sourced deltaic systems [Taberner et al, 1999]. The data obtained from this area have been discussed in detail by Taberner et al The data set is summarized in Tables 1, 2, Figure 2 and the discussion for further details and additional reasons for rejecting fault-related folding).…”

Section: Introductionmentioning

confidence: 99%

Decoupled flexure in the South Pyrenean Foreland

Waltham¹,

Docherty²,

Taberner³

2000

J. Geophys. Res.

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“…We interpret the observed dispersion in declinations after tectonic correction of site-mean directions as being caused by differential vertical-axis rotation of individual sites with respect to the reference direction for the Eocene -Miocene interval for the geographic coordinates of the study area (D ¼ 0048, I ¼ 488, a 95 ¼ 68). This reference direction was calculated from the Eocene, Oligocene and Miocene reference directions from Taberner et al (1999), Barberà et al (1996) and Larrasoaña et al (2006), respectively, relocated to the geographic coordinates of the study area by the pole conversion method (Noël & Batt 1990). Sites AL07 and AL25 therefore show no vertical-axis rotation considering their error intervals and that of the reference direction; sites SA07, SA14 and AL11 (all of them located at the northern sector of the studied area) display an average clockwise rotation of 178; and site AL26, located at the southern sector, displays an anticlockwise rotation of 218 (Fig.…”

Section: Limestones Limestonesmentioning

confidence: 99%

Integration of palaeomagnetic data, basement-cover relationships and theoretical calculations to characterize the obliquity of the Altomira–Loranca structures (central Spain)

Valcárcel

Soto

Beamud

et al. 2015

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The main objective of this work is to characterize the structures belonging to the Altomira Range and Loranca Basin (SW Iberian Chain, Central Spain) in terms of understanding their present-day orientation, highly oblique with respect to the NW-SE orientation of adjacent structures of the Iberian Chain. The Altomira and Loranca fold and thrust belts present a slightly curved geometry with a general north-south orientation at their central sector, and structures oriented NNE-SSW and north-south to NNW-SSE at their northern and southern sectors, respectively. Palaeomagnetic data from Middle Eocene-Lower Miocene rocks (including clays, fine sandstones and limestones) reveal the absence of vertical-axis rotations in the central sector of the studied area, where structures are oriented north-south, and up to 178 of clockwise and 218 of anticlockwise vertical-axis rotations in the northern and southern sectors, respectively. These data are supported by calculations of the theoretical vertical-axis rotations from shortening estimates and basement-cover structural relationships. This approach highlights the importance of integrating different datasets to characterize the obliquity of fold and thrust belts.Supplementary material: Complete information about the paleomagnetic sites and directions is available at

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Basin infill architecture and evolution from magnetostratigraphic cross-basin correlations in the southeastern Pyrenean foreland basin

Cited by 47 publications

References 34 publications

Evolution of magnetic fabrics during incipient deformation of mudrocks (Pyrenees, northern Spain)

Evolution of magnetic fabrics during incipient deformation of mudrocks (Pyrenees, northern Spain)

Decoupled flexure in the South Pyrenean Foreland

Integration of palaeomagnetic data, basement-cover relationships and theoretical calculations to characterize the obliquity of the Altomira–Loranca structures (central Spain)

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