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Pseudopaleosecular variation due to remanence anisotropy in a pyroclastic flow succession

Abstract : In order to check the reliability of a paleosecular variation record in a sequence of pyroclastic rocks (Miocene, Sardinia), we measured various types of anisotropy: magnetic susceptibility (AMS), anhysteretic remanent magnetization (AARM) and thermoremanent magnetization (ATRM). The main magnetic carrier is pseudo-single domain titanomagnetite. No general relation appears between the degrees of AMS and AARM, while the degrees of AARM and ATRM are almost identical. Measuring the AARM thus provides a fast and reliable method to correct paleomagnetic deviation in volcanic rocks. Once corrected for anisotropy deviation the apparent scatter of the paleomagnetic directions, mostly on inclination, is drastically reduced.
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https://hal.archives-ouvertes.fr/hal-03036447
Contributor : Jerome Gattacceca <>
Submitted on : Wednesday, January 27, 2021 - 10:16:04 AM
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J. Gattacceca, Pierre Rochette. Pseudopaleosecular variation due to remanence anisotropy in a pyroclastic flow succession. Geophysical Research Letters, American Geophysical Union, 2002, 29 (8), pp.127-1-127-4. ⟨10.1029/2002GL014697⟩. ⟨hal-03036447⟩

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