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Palaeomagnetic and AMS study of the Tarfaya coastal basin, Morocco: an early Turonian palaeopole for the African plate

Vicente Carlos Ruiz-Martínez, Alicia Palencia-Ortas, Juan José Villalaín, Gregg McIntosh and Fátima Martín-Hernández
Geological Society, London, Special Publications, 357, 211-227, 13 October 2011, https://doi.org/10.1144/SP357.11
Vicente Carlos Ruiz-Martínez
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Alicia Palencia-Ortas
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Juan José Villalaín
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Gregg McIntosh
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Fátima Martín-Hernández
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Abstract

An early Turonian (c. 93 Ma) anoxic, cyclic marine deposition is registered in the unfolded outcrops from the Tarfaya coastal basin, where very high sedimentation rates enable the investigation of past geomagnetic field record at high temporal resolution. One hundred and fourteen samples have been sampled along a 10.5 m vertical profile (c. 200–500 ka) of orbital-scale forced sedimentation. Rock magnetic investigations reveal mineralogy principally controlled by diamagnetic and paramagnetic behaviour, along with very low concentrations of low-coercivity ferromagnetic material which is probably magnetite. A well-defined magnetic fabric can be seen with the minimum susceptibility axis perpendicular to the foliation plane, and magnetic lineation compatible with NW African palaeostress since sedimentation times and/or the palaeocurrent associated with upwelling system deposition. Magnetic signature has the potential for performing reliability checks of reversed tiny wiggles, which were found in four samples not considered for the tectonic analysis. Alternating field demagnetization shows a single, stable, low-coercivity directional component. The new palaeopole (N=88; PLat=64.3°, PLon=256.3°, A95=2.5°; K=38.7), obtained after moderate (f=0.8) inclination flattening correction, is the first early Turonian palaeopole for the NW African Craton. It can contribute to the 90 Ma-centred sliding window of the different proposed synthetic Apparent Polar Wander Paths.

  • © The Geological Society of London 2011

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Geological Society, London, Special Publications: 357 (1)
Geological Society, London, Special Publications
Volume 357
2011
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Palaeomagnetic and AMS study of the Tarfaya coastal basin, Morocco: an early Turonian palaeopole for the African plate

Vicente Carlos Ruiz-Martínez, Alicia Palencia-Ortas, Juan José Villalaín, Gregg McIntosh and Fátima Martín-Hernández
Geological Society, London, Special Publications, 357, 211-227, 13 October 2011, https://doi.org/10.1144/SP357.11
Vicente Carlos Ruiz-Martínez
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Alicia Palencia-Ortas
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Juan José Villalaín
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Gregg McIntosh
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Fátima Martín-Hernández
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Palaeomagnetic and AMS study of the Tarfaya coastal basin, Morocco: an early Turonian palaeopole for the African plate

Vicente Carlos Ruiz-Martínez, Alicia Palencia-Ortas, Juan José Villalaín, Gregg McIntosh and Fátima Martín-Hernández
Geological Society, London, Special Publications, 357, 211-227, 13 October 2011, https://doi.org/10.1144/SP357.11
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  • Article
    • Abstract
    • Studied section and sampling
    • Rock magnetic properties
    • Anisotropy of magnetic susceptibility
    • Natural remanence demagnetization and magnetostratigraphic column
    • Testing inclination flattening and secular variation estimates
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