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Alternating field-impressed AMS in rocks

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  • معلومة اضافية
    • Contributors:
      Institut de Physique du Globe de Paris (IPGP); Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Université de La Réunion (UR)-Institut de Physique du Globe de Paris (IPG Paris)-Centre National de la Recherche Scientifique (CNRS); Geophysical Institute; Bulg. Acad. Sci.; Centre de Physique du Globe B 5670 Dourbes (viroinval) Belgium (CENTRE DE PHYSIQUE DU GLOBE DE DOURBES); centre de Physique du globe de Dourbes (Belgique); Laboratoire Magmas et Volcans (LMV); Observatoire de Physique du Globe de Clermont-Ferrand (OPGC); Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS); National Institute of Polar Research Tokyo (NiPR); Department of Geology and Geography; Sofia University "St. Kliment Ohridski"
    • بيانات النشر:
      HAL CCSD
      Oxford University Press (OUP)
    • الموضوع:
      2007
    • Collection:
      HAL Clermont Auvergne (Université Blaise Pascal Clermont-Ferrand / Université d'Auvergne)
    • نبذة مختصرة :
      International audience ; We studied the evolution of anisotropy of magnetic susceptibility (AMS) during stepwise alternating fields (AF) demagnetization on various kinds of rock samples (loess and palaeosols, diorite, granite, gneiss) with very different degree of magnetic anisotropy. The variation of the magnetic fabric appears to be related to both the magnetic fabric before AF demagnetization and to the direction of AF application. The anisotropy change is mainly controlled by the initial magnetic fabric. The more anisotropic is the initial magnetic fabric, the less is the effect of the direction of field application. This can be clearly shown by determination of the difference of the susceptibility ellipsoids after and before AF application. Even for rocks with weak magnetic anisotropy, the effect of the initial AMS is significant. The difference ellipsoids allow in particular cases to point out that the initial magnetic fabric is composite.
    • Relation:
      hal-00153109; https://hal.science/hal-00153109; https://hal.science/hal-00153109/document; https://hal.science/hal-00153109/file/168-2-533.pdf
    • الرقم المعرف:
      10.1111/j.1365-246X.2006.03235.x
    • Rights:
      info:eu-repo/semantics/OpenAccess
    • الرقم المعرف:
      edsbas.C4522FF3