Secular variation in Permian red beds from Dôme de Barrot, SE France

P.P. Kruiver; M.J. Dekkers; C.G. Langereis

doi:10.1016/S0012-821X(00)00104-7

Secular variation in Permian red beds from Dôme de Barrot, SE France

P.P. Kruiver, M.J. Dekkers, C.G. Langereis

Research output: Contribution to journal › Article › Academic › peer-review

Abstract

The Dôme de Barrot red beds (SE France) were deposited during the Permo–Carboniferous Reversed Superchron (PCRS), near the palaeo-equator. The natural remanent magnetisation (NRM) resides in detrital hematite, which is very resistant against thermal demagnetisation. Microprobe analyses reveal the presence of titanium in hematite grains, indicating the volcanic and thus detrital origin. Therefore, the NRM is a detrital remanent magnetisation and NRM variations reflect changes in the geomagnetic field. Tuning of the proxy parameter magnetic susceptibility to periods of the Earth orbit during Permian times provides relative time control. The inferred average sedimentation rate is 11.8 cm 1000 yr−1. The variation in NRM directions is similar to present-day secular variation (SV). This suggests that SV was not suppressed during (at least part of) the PCRS.

Original language	English
Pages (from-to)	205-217
Number of pages	13
Journal	Earth and Planetary Science Letters
Volume	179
Issue number	1
DOIs	https://doi.org/10.1016/S0012-821X(00)00104-7
Publication status	Published - 2000

Keywords

paleomagnetism
Milankovitch theory
Hematite
depositional remanent magnetisation
secular variation
Permian

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10.1016/S0012-821X(00)00104-7

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title = "Secular variation in Permian red beds from D{\^o}me de Barrot, SE France",

abstract = "The D{\^o}me de Barrot red beds (SE France) were deposited during the Permo–Carboniferous Reversed Superchron (PCRS), near the palaeo-equator. The natural remanent magnetisation (NRM) resides in detrital hematite, which is very resistant against thermal demagnetisation. Microprobe analyses reveal the presence of titanium in hematite grains, indicating the volcanic and thus detrital origin. Therefore, the NRM is a detrital remanent magnetisation and NRM variations reflect changes in the geomagnetic field. Tuning of the proxy parameter magnetic susceptibility to periods of the Earth orbit during Permian times provides relative time control. The inferred average sedimentation rate is 11.8 cm 1000 yr−1. The variation in NRM directions is similar to present-day secular variation (SV). This suggests that SV was not suppressed during (at least part of) the PCRS.",

keywords = "paleomagnetism, Milankovitch theory, Hematite, depositional remanent magnetisation, secular variation, Permian",

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doi = "10.1016/S0012-821X(00)00104-7",

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TY - JOUR

T1 - Secular variation in Permian red beds from Dôme de Barrot, SE France

AU - Kruiver, P.P.

AU - Dekkers, M.J.

AU - Langereis, C.G.

PY - 2000

Y1 - 2000

N2 - The Dôme de Barrot red beds (SE France) were deposited during the Permo–Carboniferous Reversed Superchron (PCRS), near the palaeo-equator. The natural remanent magnetisation (NRM) resides in detrital hematite, which is very resistant against thermal demagnetisation. Microprobe analyses reveal the presence of titanium in hematite grains, indicating the volcanic and thus detrital origin. Therefore, the NRM is a detrital remanent magnetisation and NRM variations reflect changes in the geomagnetic field. Tuning of the proxy parameter magnetic susceptibility to periods of the Earth orbit during Permian times provides relative time control. The inferred average sedimentation rate is 11.8 cm 1000 yr−1. The variation in NRM directions is similar to present-day secular variation (SV). This suggests that SV was not suppressed during (at least part of) the PCRS.

AB - The Dôme de Barrot red beds (SE France) were deposited during the Permo–Carboniferous Reversed Superchron (PCRS), near the palaeo-equator. The natural remanent magnetisation (NRM) resides in detrital hematite, which is very resistant against thermal demagnetisation. Microprobe analyses reveal the presence of titanium in hematite grains, indicating the volcanic and thus detrital origin. Therefore, the NRM is a detrital remanent magnetisation and NRM variations reflect changes in the geomagnetic field. Tuning of the proxy parameter magnetic susceptibility to periods of the Earth orbit during Permian times provides relative time control. The inferred average sedimentation rate is 11.8 cm 1000 yr−1. The variation in NRM directions is similar to present-day secular variation (SV). This suggests that SV was not suppressed during (at least part of) the PCRS.

KW - paleomagnetism

KW - Milankovitch theory

KW - Hematite

KW - depositional remanent magnetisation

KW - secular variation

KW - Permian

U2 - 10.1016/S0012-821X(00)00104-7

DO - 10.1016/S0012-821X(00)00104-7

M3 - Article

SN - 0012-821X

VL - 179

SP - 205

EP - 217

JO - Earth and Planetary Science Letters

JF - Earth and Planetary Science Letters

IS - 1

ER -

Secular variation in Permian red beds from Dôme de Barrot, SE France

Abstract

Keywords

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