[1] Heidelberg Univ, D-69120 Heidelberg, Germany
[2] GeoForschungsZentrum Potsdam, Expt Geochem & Mineral Phys, D-14473 Potsdam, Germany
[3] Forschungszentrum Dresden Rossendorf, Hochfeld Magnetlab Dresden HLD, D-01314 Dresden, Germany
[4] Univ Bayreuth, Phys Inst, D-95440 Bayreuth, Germany
[5] Univ Bayreuth, Bayer Geoinst, D-95440 Bayreuth, Germany