Pseudopaleosecular variation due to remanence anisotropy in a pyroclastic flow succession

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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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Gattacceca, J., & Rochette, P. (2002). Pseudopaleosecular variation due to remanence anisotropy in a pyroclastic flow succession. Geophysical Research Letters, 29(8). https://doi.org/10.1029/2002GL014697

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