Palaeomagnetism of the Permian rocks of Lodève (Hérault, France)

Merabet, N.; Guillaume, Alfred

doi:10.1016/0040-1951(88)90312-5

Cited by 25 publications

(13 citation statements)

References 11 publications

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“…Rotation possibly also affected the Brive basin [4,5]. However, no significant rotations have been observed in the neighboring Permian Lodeve basin [6] situated in the south of the Saint-Affrique basin and in the Largentiere basin [7], located on the eastern border of the French Massif Central. The aim of this paleomagnetic study in the Rodez basin, situated on the contrary north of the Saint-Affrique basin, was to search for traces of major rotations in this area, to determine the importance, age and extent of these late Variscan tectonic events in the French Massif Central.…”

Section: Introductionmentioning

confidence: 69%

Paleomagnetic results from the Permian Rodez basin implications: the Late Variscan tectonics in the southern French Massif Central

Diego-Orozco¹,

Chen²,

Henry³

et al. 2002

Geodinamica Acta

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A paleomagnetic study has been carried out on three sedimentary formations of the Permian Rodez basin in the southern France. Two of them yield paleomagnetic poles of Saxonian and Thuringian age showing counterclockwise rotation of moderate amplitude, during or after the Thuringian deposition. For the French Massif Central, contrary to its stable southern (Lodeve basin) and eastern (Largentiere basin) borders, on its southwestern border, in a large area including the Rodez, Saint-Affrique and perhaps Brive basins suffered rotations due to the extensional tectonics during the Late Variscan period.

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Section: Introductionmentioning

confidence: 69%

Paleomagnetic results from the Permian Rodez basin implications: the Late Variscan tectonics in the southern French Massif Central

Diego-Orozco¹,

Chen²,

Henry³

et al. 2002

Geodinamica Acta

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“…The Lodève Basin redbeds have been studied by several authors (Kruseman, 1962;Merabet and Guillaume, 1988;Cogné et al, 1990;Maillol and Evans, 1993;Haldan et al, 2009) who all conclude that the entire sequence carries reversed polarity and thus falls within the PCRS. But Evans (2012) found evidence-from a single sample-of a return to normal polarity at the very top of a section that is stratigraphically higher than all previous studies.…”

Section: Sampling and Laboratory Measurementsmentioning

confidence: 98%

Late Permian paleomagnetic results from the Lodève, Le Luc, and Bas-Argens Basins (southern France): Magnetostratigraphy and geomagnetic field morphology

Evans

Павлов

Veselovsky

et al. 2014

Physics of the Earth and Planetary Interiors

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“…It contains approximately 3000 m of continental, mostly detrital, deposits. Recent studies (Nmila et al 1989) indicate that volcanic relicts are very common in all members of the sequence, which points to a volcanosedimentary origin for the material filling the basin. The structure of the basin is that of a half graben controlled by two major faults in the south and southeast.…”

Section: Geological Settingmentioning

confidence: 98%

“…The Permian sedimentary rocks of the Lod2ve Basin (southern France) are known to carry a stable remanence with characteristic Permian directions (Kruseman 1962;Evans & Maillol 1986;Merabet & Guillaume 1988), but they have never been subject to detailed rock magnetic analysis. The initial goal of our study was to investigate the possibility of extracting palaeosecular variation data from the L o d h e strata in order to study geomagnetic field behaviour during the Permo-carboniferous Reversed Superchron (Kiaman).…”

Section: Introductionmentioning

confidence: 99%

Magnetic intensity variations in red beds of the Lodève Basin (southern France) and their bearing on the magnetization acquisition process

Maillol

Evans

1992

Geophysical Journal International

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An investigation of small-scale variations of magnetization of a red bed sequence in the Permian Lodbve Basin (southern France) has been carried out by means of 512 disc-shaped samples, each 25 mm in diameter and about 6 mm thick. It is found that magnetic intensity variations reaching an order of magnitude can occur over stratigraphic distances of only a few centimetres. These fluctuations show a clear lithostratigraphic control with intensity peaks systematically located at bed tops. Rock magnetic experiments and petrographic observations indicate that intensity variations are not due to changes in the amount or properties of the magnetic material. External causes, such as geomagnetic field fluctuations or superposition of reversed and normal components, can be ruled out. Petrographical evidence suggests that the magnetization is carried by detrital haematite grains and it is proposed that the controlling factor of intensity variations is the efficiency of alignment of these grains along the Earth's magnetic field. The characteristic intensity patterns with peaks near bed tops can be explained by post-depositional alignment of the grains, with the highest efficiency near the exposed surface. Grain mobility can be enhanced by mechanical perturbations (bioturbations, hydraulic phenomena), increased water content and reduced load. All these factors tend to see their effect diminish away from the surface and could therefore produce the observed magnetization pattern. The proposed model points to an early acquisition of the remanence in the Lodbve red beds.

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Palaeomagnetism of the Permian rocks of Lodève (Hérault, France)

Cited by 25 publications

References 11 publications

Paleomagnetic results from the Permian Rodez basin implications: the Late Variscan tectonics in the southern French Massif Central

Paleomagnetic results from the Permian Rodez basin implications: the Late Variscan tectonics in the southern French Massif Central

Late Permian paleomagnetic results from the Lodève, Le Luc, and Bas-Argens Basins (southern France): Magnetostratigraphy and geomagnetic field morphology

Magnetic intensity variations in red beds of the Lodève Basin (southern France) and their bearing on the magnetization acquisition process

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