People at Fort Hoofddijk

Fatima Martin
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Dr. F. Martín-Hernández
Postdoc 2005-2007
EU Marie Curie fellowships

Now at:
Dept. Physics of the Earth, Astronomy and Astrophysics, Faculty of Physics
Universidad Complutense de Madrid
Madrid, SPAIN
Tel. +34 913 945 007



Research of Fatima Martin

Separation of magnetic anisotropy components
of different magnetic mineral types. 

Measurements of the low-field anisotropy of magnetic susceptibility reflect mainly the magnetic fabric of the ferromagnetic minerals because their magnetization is higher. In many natural rocks, however, the anisotropy of magnetic susceptibility (AMS) is in part determined - and sometimes even dominated - by the paramagnetic minerals that form the rock-matrix.  Therefore, a proper interpretation of the magnetic fabric requires the separation of the magnetic subfabrics, because the minerals could have been formed in different periods of the rock history, or they might have undergone different deformation paths. 
In particular, I am interested in the separation of magnetic fabrics in samples rich in hematite and pyrrhotite. These two minerals have a crystalline anisotropy that forces the magnetisation to lie in the basal plane. Since the magnetisation is constrained within this basal plane, the study of the natural remanent magnetisation (NRM) carried by these two minerals can be affected by anisotropy and deflected from the original paleomagnetic direction.

Figure 1 from Martín et al. (2001)

I am also interested in numerical modelling of the AMS for a complete interpretation of the deformation events recorded by the rocks. A proper simulation of the measured AMS can be used for interpretation of strain-AMS correlation in the absence of strain markers.

Figure 9 from Martín et al. (2003)

publications Publications of Fatima Martin
  • Martín-Hernández, F., Dekkers, M.J., Bominaar-Silkens, I.M.A. and Maan, J.C. (2008). Magnetic anisotropy behaviour of pyrrhotite as determined by low- and high-field experiments, Geophys. J. Int., doi: 10.1111/j.1365-246X.2008.03793.x 
  • Martín-Hernández, F. and Ferré, E.C.(2007). Separation of paramagnetic and ferrimagnetic anisotropies, J. Geophys. Res., 112(B3), doi: 10.1029 / 2006JB004340 
  • Schmidt, V., Hirt, A.M., Rosselli, P. and Martín-Hernández, F. (2007). Separation of diamagnetic and paramagnetic anisotropy by high-field, low-temperature torque measurements, Geophys. J. Int., 168, 40-47 


  • Martín-Hernández, F., Bominaar-Silkens, I. ,Dekkers, M.J. and Maan, J.K. (2006). High-field cantilever torque magnetomery as a tool for single crystal magnetocrystalline anisotropy determinations, Tectonophysics, 418, 21-30. 
  • Martín-Hernández, F., Kunze, K., Julivert, M., and Hirt A.M. (2005). Mathematical simulation of magnetic susceptibility on composite fabrics, J. Geophys. Res., 110, B06102, doi: 10.1029/2004JB003505, 2005 
  • Ferré, E. C., Martín-Hernández, F., Teyssier, C. & Jackson, M. (2004). Paramagnetic and ferromagnetic anisotropy of magnetic susceptibility in migmatites: measurements in high and low fields and kinematic implications. Geophys. J. Int., 157, 1119-1129 
  • Just, J., Kontny, A., de Wall, H., Hirt, A.M, and Martín-Hernández, F. (2004). Development of magnetic fabrics during hydrothermal alteration in the Soultz-sous-Forêts granite from the EPS-1 drilling, Upper Rhine Graben, In: Martín-Hernández, F., Luneburg, C.M., Aubourg, C. and Jackson, M.  (Eds.), Magnetic Fabric: Methods and Applications. Geological Society, London, Special publications, 238,  509-526.
  • Martín-Hernández, F. & Hirt, A. M. (2004). A method for the separation of paramagnetic, ferrimagnetic and haematite magnetic subfabrics using high-field torque magnetometry. Geophys. J. Int., 157, 117-127 
  • Martín-Hernández, F., Luneburg, C.M., Aubourg, C. and Jackson, M. (2004). Magnetic fabric: methods and applications-an introduction. In: Martín-Hernández, F., Luneburg, C.M., Aubourg, C. and Jackson, M  (Eds.), Magnetic Fabric: Methods and Applications. Geological Society, London, Special publications, 238, 1-7.
  • Muttoni, G., Kent, D.V., Olsen, P.E., Di Stefano, P., Lowrie, W., Bernasconi, S.M., Martín-Hernández, F. (2004). Tethyan magnetostratigraphy from Pizzo Mondello (Sicily) and correlation to the Late Triassic Newark astrochronological polarity time scale. GSA Bull., 116(9), 1043-1058. 
  • Martín-Hernández, F. & Hirt, A. M., 2003. The anisotropy of magnetic susceptibility in biotite, muscovite and chlorite single crystals. Tectonophysics, 367, 13-28
  • Martin-Hernandez, F. (2002). Determination of fundamental magnetic anisotropy parameters in rock-forming minerals and their contributions to the magnetic fabric of rocks (Ph.D Thesis, ETH-Zurich), 183 pp. 
  • Martín-Hernández, F. and Hirt, A.M. (2001). Separation of ferrimagnetic and paramagnetic anisotropies using a high-field torsion magnetometer. Tectonophysics, 337, 209-221. 
  • Osete, M.L., Martín-Hernández, F., Osete, C., Villalaín, J.J., Nuñez, J.I., Martín-Atienza, B. and García-Dueñas, V. (1998). Estudio Paleomagnético de las Peridotitas del complejo ultrabásico de Ronda, 1ª Asamblea Hispano-Portuguesa de Geodesia y Geofísica, Aguadulce (Almeria).