GP21A:
The Geomagnetic Field on Long Timescales: Characterization and Linkages with Evolution of the Core and Mantle I


Session ID#: 8299

Session Description:
We solicit contributions on the characterization of the geomagnetic field (paleo-directions and paleointensity) on time scales of hundreds of thousands of years to billions of years. Topics of interest include, but are not restricted to, the morphology of the field, the frequency of reversals, potential mantle control on the geodynamo, the timing of inner core growth, and the onset and persistence of a strong geomagnetic field. The session is planned to promote dialogue between experimental and theoretical aspects of the subject, so we welcome contributions ranging from paleomagnetic field investigations, numerical dynamo simulations, and theoretical studies.
Primary Convener:  John Anthony Tarduno, University of Rochester, Department of Physics and Astronomy, Rochester, NY, United States
Conveners:  Aleksey V Smirnov, Michigan Technological University, Department of Geological and Mining Engineering and Sciences, Houghton, United States and Michael Edwin Evans, Univ of Alberta, Edmonton, AB, Canada
Chairs:  John Anthony Tarduno, University of Rochester, Department of Physics and Astronomy, Rochester, NY, United States and Aleksey V Smirnov, Michigan Technological University, Department of Geological and Mining Engineering and Sciences, Houghton, United States
OSPA Liaison:  Aleksey V Smirnov, Michigan Technological University, Department of Geological and Mining Engineering and Sciences, Houghton, United States

Cross-Listed:
  • DI - Study of the Earth's Deep Interior
Index Terms:

1507 Core processes [GEOMAGNETISM AND PALEOMAGNETISM]
1521 Paleointensity [GEOMAGNETISM AND PALEOMAGNETISM]
1522 Paleomagnetic secular variation [GEOMAGNETISM AND PALEOMAGNETISM]
1535 Reversals: process, timescale, magnetostratigraphy [GEOMAGNETISM AND PALEOMAGNETISM]

Abstracts Submitted to this Session:

Electrical conductivity in the mantle and core and implications for the geodynamo (Invited) (67186)
Ronald E Cohen, Ludwig Maximilians University of Munich, Department for Earth and Enviromental Sciences, Munich, Germany; Carnegie Institution for Science, Earth and Planets Laboratory, Washington, United States, Peng Zhang, Xi'an Jiaotong University, Department of Physics, Xian, China and Kristjan Haule, Rutgers University, Department of Physics, Piscataway, United States
Geomagnetic Intensity Record from the 1.43 Ga Laramie Anorthosite Complex (85002)
Jeffrey S Gee, University of California San Diego, La Jolla, CA, United States, Peter A Selkin, U Washington, Tacoma, Tacoma, WA, United States and William P Meurer, Exxon Mobil Upstream Research, Houston, TX, United States
Geomagnetic field behaviour preceding a Superchron: new evidence for a weak Devonian geomagnetic field (66969)
Louise Hawkins1, Taslima Anwar2, Valentina Scherbakova3, Andrew John Biggin4, Vadim A Kravchinsky2, Andrei Shatsillo5, James Holt6 and Vladimir Pavlov7, (1)University of Liverpool, Liverpool, United Kingdom, (2)University of Alberta, Edmonton, AB, Canada, (3)Borok Geophysical Observatory, IPE RAS, Borok, Russia, (4)University of Liverpool, Liverpool, L69, United Kingdom, (5)Schmidt Institute of Physics of the Earth RAS, Moscow, Russia, (6)University of Liverpool, Institute for Risk and Uncertainty, Liverpool, United Kingdom, (7)Institute of Physics of the Earth RAS, Moscow, Russia
Geomagnetic superchrons and time variations in the cooling rate of the core (Invited) (58547)
Peter Olson, Johns Hopkins University, Department of Earth & Planetary Sciences, Baltimore, MD, United States
Low-dimensional analysis of geomagnetic reversals (65872)
Alexandre Fournier, Université de Paris, Institut de Physique du Globe de Paris, CNRS, Paris, France, Matthias Morzfeld, University of California Berkeley, Berkeley, CA, United States and Gauthier Hulot, Université Paris Cité, Institut de physique du globe de Paris, CNRS, Paris, France
Further Evaluation of Geomagnetic Dipole Asymmetry in Growth and Decay (75902)
Margaret S Avery1, Catherine Constable2 and Jeffrey S Gee1, (1)University of California San Diego, La Jolla, CA, United States, (2)University of California San Diego, Scripps Institution of Oceanography, IGPP, La Jolla, CA, United States

See more of: Geomagnetism and Paleomagnetism