GP011
Magnetic Anisotropy: Past, Present and Future Frontiers
Session ID#: 77869
Session Description:
Magnetic anisotropy on the scale of a particle originates from the mineral’s composition and crystal structure, can be influenced by crystal defects, particle shape and stress.
For an ensemble of particles (i.e. rock or sediment), magnetic anisotropy reflects the cumulative response of the individual particle anisotropies. It is dictated by the orientation distribution of all minerals present, for induced magnetic anisotropy, or uniquely remanence-bearing particles, for remanent magnetic anisotropy. It can also originate in magnetostatic interactions among strongly magnetic particles with heterogeneous spatial distributions.
This session brings together current research in magnetic anisotropy on all length scales including: anisotropy measurement techniques, effects of anisotropy on remanence acquisition processes (e.g. the recorded field’s direction and intensity), and how to best-account for it, deciphering emplacement mechanisms of igneous rocks, depositional environments and paleo-current directions of sediments and sedimentary rocks, determining deformation and strain, quantifying single crystal properties, and modeling the expected anisotropies.
Index Terms:
1518 Magnetic fabrics and anisotropy [GEOMAGNETISM AND PALEOMAGNETISM]
1527 Paleomagnetism applied to geologic processes [GEOMAGNETISM AND PALEOMAGNETISM]
1540 Rock and mineral magnetism [GEOMAGNETISM AND PALEOMAGNETISM]
1594 Instruments and techniques [GEOMAGNETISM AND PALEOMAGNETISM]
Primary Convener: France Lagroix, Institut de Physique du Globe de Paris, Paris, France
Conveners: Dario Bilardello, University of Minnesota, Institute for Rock Magnetism, Minneapolis, MN, United States and Bjarne Sven Guestav Almqvist, Uppsala University, Earth Sciences, Uppsala, Sweden
Primary Liaison: France Lagroix, Institut de Physique du Globe de Paris, Paris, France
Relative paleointensity estimates from magnetic anisotropy (490644)
Stuart A Gilder, Ludwig Maximilians University of Munich, Munich, Germany, Kuang He, Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China, Michael Richard Wack, Department of Geo- and Environ, Munich, Germany and Josef Jezek, Charles University, Prague, Czech Republic
Magnetosomal Greigite as the Source of Intermediate and Inverse Magnetic Fabrics at IODP Site M0061 (Baltic Sea) (494551)
Ian Snowball1, Bjarne Sven Guestav Almqvist2, Steffen Wiers1, Bryan Lougheed1 and Martin Chadima3,4, (1)Uppsala University, Department of Earth Sciences, Uppsala, Sweden, (2)Uppsala University, Earth Sciences, Uppsala, Sweden, (3)AGICO lnc, Brno, Czech Republic, (4)Institute of Geology of the Czech Academy of Sciences, Prague, Czech Republic, Prague, Czech Republic
Can magnetic fabric indicate overthrust directions? Insights from West Spitsbergen Fold-and-Thrust Belt (497438)
Martin Chadima1,2, Katarzyna Dudzisz3, Josef Jezek4, Frantisek Hrouda4,5, Michael Richard Wack6 and Stuart Gilder6, (1)Institute of Geology of the Czech Academy of Sciences, Prague, Czech Republic, Prague, Czech Republic, (2)AGICO lnc, Brno, Czech Republic, (3)Institute of Geophysics Polish Academy of Sciences, Warsaw, Poland, (4)Charles University, Prague, Czech Republic, (5)AGICO lnc, Brno, 621, Czech Republic, (6)Ludwig Maximilians University of Munich, Munich, Germany
Emplacement Dynamics of the Alkaline Volcanic and Subvolcanic Rocks of Trindade Island, Brazil: an Anisotropy of Magnetic Susceptibility (AMS) Study. (502897)
Natália Gauer Pasqualon1, Jairo F Savian1, Fernando Rodrigues da Luz1, Evandro F de Lima2, Thiago Ribas Moncinhatto3 and Ricardo IF Trindade4, (1)Universidade Federal do Rio Grande do Sul - UFRGS, Porto Alegre, Brazil, (2)Universidade Federal do Rio Grande do Sul - UFRGS, Geociencias, Porto Alegre, Brazil, (3)Universidade de São Paulo - IAG/USP, São Paulo, Brazil, (4)Universidade de São Paulo, Geophysics, São Paulo, Brazil
A 1.1 billion-year-old anisotropy experiment: a study of anorthosite xenoliths within the Beaver River diabase (510589)
Yiming Zhang, University of California Berkeley, Earth and Planetary Science, Berkeley, United States, Nicholas Swanson-Hysell, University of California Berkeley, Earth and Planetary Science, Berkeley, CA, United States and Margaret S Avery, University of California San Diego, La Jolla, CA, United States
Novel Application Of The Anisotropy Of Magnetic Susceptibility (AMS) In Cenozoic Strata Across The Central Italian Apennines As A Paleogeodetic Measure Of Strain And The Eastward March Of Extension Above A Foreland Dipping Detachment (517352)
David J Anastasio, Lehigh University, Earth & Environmental Sciences, Bethlehem, PA, United States, Frank J Pazzaglia, Lehigh Univ, Bethlehem, PA, United States, Josep M Pares, CENIEH, Burgos, Spain, Alessandro Montanari, Osservatorio Geologico di Coldigioco, 62021 Apiro, Italy and Lorraine Kathryn Carnes, Arizona State University, Tempe, AZ, United States
Magnetic fabric characterization of a megathrust shear zone: preliminary results from the Sestola Vidiciatico Tectonic Unit, Northern Appenines (Italy). (541551)
Claudio Robustelli Test1, Elena Zanella1, Andrea Festa1 and Francesca Remitti2, (1)University of Torino, Department of Earth Sciences, Torino, Italy, (2)University of Modena and Reggio Emilia, Department of Chemical and Geological Sciences, Modena, Italy
