IAGA in Toulouse - Division I Symposium

IDI01 The geodynamo: theory, models, observation and experiment (Divisions I and V)

This two-day symposium will cover all aspects of studies on the geodynamo. Theoretical studies addressing different aspects of the geodynamo have been responsible for the main advances in the understanding of the geodynamo. Recent advances in computer technology have enabled researchers to refine models of the geodynamo and to extend their parameter range in their numerical simulations. It is still difficult to obtain convergent convection driven dynamos for low Prandtl numbers, and experimental studies, particularly on low Prandtl number fluids, are used to study this range of Prandtl number dynamics. Observational studies on the whole range of timescales represent an important aspect of dynamo theory and provide comparative studies with theory and experiment. The symposium should provide a stimulating interaction between workers in these four areas of study. There will be invited speakers in the four main areas and contributions in all four areas are welcome. Contributions can either be presented orally or as posters

Convener: I.A. Eltayeb Department of Mathematics and Statistics, Sultan Qaboos University, P.O. Box 36, Muscat 123, Sultanate of Oman. Tel. (968) 515427; Fax (968) 513109: email: ieltayeb@squ.edu.om; or ieltayeb@omantel.net.om
Co-conveners: Gauthier Hulot, IPGP, Département de Géomagnétisme et Paléomagnétisme, Paris, France: Philippe Cardin, (2003-2007) LGIT/ Observatoire de Grenoble, France; R. Holme, Department of Earth and Ocean Sciences, University of Liverpool, UK.

IDI02 Investgation of the deep mantle using long period EM data from observatories, cables, long period MT and satellites (Divisions I and V)

The symposium is dedicated to the deep earth electrical structure derived from geomagnetic and geolectric data obtained at the planet surface and/or from satellite. The increasing number of long period induction data at the regional and global scale provide a new and unique insight of the tri-dimensional structure of the earth mantle. New approaches for processing, analysing and interpretating land and seafloor observatories, submarine cables and satellite data are necessary. A challenge is in the combination of all these data in a single processing and interpretation scheme. The global induction study of the Earth is now entering in a new era. We seek papers illustrating the current state and progress in this domain.

Convener: P. Tarits, UBO - IUEM, UMR "Domaines Océaniques", Place Nicolas Copernic, 29280 Plouzane, France; tel +33 2 98 49 87 63; fax +33 2 98 49 87 60; e-mail: tarits@univ-brest.fr
Co-conveners: H. Utada, Ocean Hemisphere Research Center, Earthquake Research Institute, University of Tokyo, Japan; N. Olsen, Center for Planetary Science / Danish Space Research Institute, Denmark

IDI03 Magneto-petrology and magnetic anomalies (Divisions I and V)

Magnetic petrology integrates rock magnetism and conventional petrology, and characterises composition, abundance, microstructure and assemblages of magnetic minerals. Based on these data it is possible to assess the processes that create, alter and destroy them. A correlation of magnetic mineralogy, bulk magnetic properties and petrology to observed magnetic anomalies contributes to a better understanding of the geological factors that control magnetic signatures on Earth and may be important for the interpretation of extraterrestrial anomalies. We welcome studies that contribute to these topics including new results on low-temperature magnetometry as well as applications in mineral exploration.

Convener: A. Kontny , Geologisch-Palaeontologisches Institut, University of Heidelberg, Im Neuenheimer Feld 234, D-69120 Heidelberg, Germany; tel +49 6221 546053; fax +49 6221 545503, email: agnes.kontny@urz.uni-heidelberg.de
Co-convener: S. McEnroe, Trondheim, Norway

GAI01 Monitoring earthquakes and volcanic activity by magnetic, electric and electromagnetic methods

Investigations of electromagnetic (EM) effects generated by the earthquake failure process and by volcanic activity are now currently carried out in many different countries. Self-consistent observations from carefully installed networks have lead to the identification of signals clearly related to volcanic and earthquakes activity. The objectives of the session is to provide a forum for discussion and integration of results from multi-disciplinary monitoring of EM transient phenomena in volcanic and tectonic regimes.

Contributions along the following lines are encouraged:

  • Integrated EM monitoring of active faults and volcanoes
  • Cross-correlation between EM phenomena and other geophysical phenomena
  • Coordinated satellite and ground-based EM experiments
  • The role of fluids in the EM signal generation
  • Constraints given by laboratory experiments and EM modelling of various physical processes.

Convenor: J. Zlotnicki , Observatoire de Physique du Globe de Clermont-Ferrand, Campus des Cézeaux, 24 av des Landais, 63177 Aubière cedex , France; fax +33 - (0)4 73 40 78 85; e-mail: jacques.zlotnicki@opgc.univ-bpclermont.fr
Co-convenors: M. Johnston , U.S. Geological Survey, USA; Y. Sasai, The Disaster Prevention, Tokyo Metropolitan Government, Japan

GAI02 EM imaging of volcanoes and active faults

The identification of fluids within volcanoes and fault structures has a crucial bearing on the understanding of long term volcanic and seismic activity. Contributions are therefore invited on both theoretical and experimental studies which use electromagnetic techniques to image the internal electrical resistivity structure of volcanoes and active faults, and which correlate the electrical structure to the presence and movement of fluids.

Convener: M. Ingham, School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington, New Zealand; tel +64-4-463-5216; fax+64-4-463-5237;
e-mail: malcolm.ingham@vuw.ac.nz
Co-convener: Y. Ogawa, Volcanic Fluid Research Center, Tokyo Institute of Technology, Japan

GAI03 EM modelling and inversion with applications

Magnetotelluric measurements provide a unique view of the Earth because of the sensitivity of electrical conductivity to temperature, fluids, ore minerals, and lithologic variations. This sensitivity is key in monitoring environmental problems, exploring for energy and mineral occurrences, investigating regions of potential natural hazards (seismic and volcanic), and studying the interior structure of the Earth. The magnetotelluric method allows obtaining the electrical properties of the subsurface at different scales, from near-surface up to lithospheric scale studies. During the last years, the development of new equipments and the progress in numerical 2-D and 3-D methods for interpretation has result in an increase of the application of the magnetotelluric method. This session solicits abstracts concerning the application of the magnetotelluric method at different earth scales. Works presenting a comparison or integration of electrical conductivity with other physical, chemical and/or geological properties are welcome.

Convener: Juanjo Ledo, Departament de Geodinamica i Geofisica, Universitat de
Barcelona, Marti i Franques s/n, Barcelona 08028, Spain; tel +34-934035911; fax +34-934021340; e-mail: jledo@ub.edu
Co-convener: Sophie Hautot, U. Edinburgh, UK

GAI04 The electric continental lithosphere: geodynamical implications

The spatial distribution of the electrical conductivity within the continental lithosphere reflects some of its petrophysical and structural properties. Highly conducting features may give hints for the existence of graphite, saline water or partial melt which determine some fundamental rheological properties. Therefore it is necessary to know theoretical resp. empirical relations between the conductivity of rocks and some petrophysical and chemical properties. Thus large scale conductivity structures, e.g. above plumes, shear zones, etc., which are derived from geomagnetic and magnetotelluric soundings will constrain geodynamic modelling.

Contributions within this context are welcome from laboratory experiments, EM field studies and geodynamic modelling.

Convener: O.Ritter, GeoForschungsZentrum, Division 2.3 Telegrafenberg, D-14473 Potsdam, Germany
Tel: +49 331 2881257; Fax: +49 331 2881235; e-mail: oritter@gfz-potsdam.de

Co-convener: A.Junge, Dept. of Geoscience, Geophysics Section, Johann Wolfgang Goethe University, Feldberfstrasse 47, D-60323 Frankfurt am Main, Germany; tel +49-69 798-24899; fax +49-69-798-23280; e-mail: junge@geophysik.uni-frankfurt.de

GAI05 EM studies of intraplate collisional zones

Electromagnetic (EM) studies throughout the world have shown that elongated crustal conductivity structures are parallel to, and approximately collocated with, collisional orogenic belts. These bodies provide an interesting view of the compressional tectonic processes implicated in their formation. Yet a compelling dynamical paradigm in which to explain the correlation between enhanced conductivity and compressional orogenesis has been lacking.

The purpose of this session is to test further the association between orogenic conductors and structural features at collisional belts. By doing so, the aim is to identifysyn-tectonic (or post-tectonic) processes responsible for the geophysical anomalies and to interpret the depth extent (from shallow sedimentary basins to whole crust or even upper mantlestructures) and lateral distribution of these processes. By associating conductivity anomalies with one or more particular phases of the orogenic process that resulted in the genesis of the conductor, EM methods present an attractive means to map the internal structure of preserved orogens.

We are looking for contributions both from (i) ongoing collisions such as Alpine-Himalaya, (ii) younger Phanerozoic (e.g. Caledonian/Appalachian) and (iii) older Proterozoic collisional zones (e.g. those in shield areas). Integrative contributions, i.e. those using EM data and other geophysical and geological data, are especially welcome.

Convener: T. Korja, Division of Geophysics, Department of Geosciences, University of Oulu, POB 3000, FIN-90014 Oulun Yliopisto, Finland; tel +358 - (0)8 - 553- 1415; fax +358 - (0)8 - 553 1484; e-mail: toivo.korja@oulu.fi
Co-convener: I. Varentsov, Geoelectromagnetic Research Institute, Russia

GAI06 NRM - reliability, stability and geodynamic applications

The Natural Remanent Magnetisation (NRM) of rocks provides first order constraints on the drift histories of the continental and oceanic crust on a plate-scale, in addition to providing information on the tectonic evolution of the crust on more regional and local scales. In order to provide such first-order constraints studies need to have an understanding of the process(es) by which the studied rocks have recorded the Earth's magnetic field, and they need to provide evidence for the stability of this record through time. A number of processes can have an effect on the reliability of this record. These processes can include inclination flattening, the filtering effect of the various recording mechanisms in rocks (chemical-, thermal-, or detrital remanent magnetisation), deformation of the rocks, and at times, the wholesale remagnetisation of the studied units. Determining the timing of magnetisation is typically done using relative estimates of the timing of magnetisation, such as the application of fold-, contact- and conglomerate-tests, whereas detection of physical or chemical changes of the magnetic mineralogy of the rocks is often attempted using rock magnetic techniques. We solicit contributions on geodynamic applications of paleomagnetic studies, on global, regional and local scales, especially those where there are good constraints on the timing and mode of origin of magnetization. We are also interested in contributions that provide novel methodologies, or new applications of old methodologies, for assessing the stability and reliability of the magnetic signal recorded in the rock record.

Convener: C. Aubourg, Tectonique 7072, Dept. Earth Sciences, U. Cergy Pontoise, 8, Le Campus, 95031 Cergy, France; tel +33-1-3425-4981; fax +33-1-3425-4904, e-mail: charly.aubourg@geol.u-cergy.fr
Co-conveners: C. MacNiocaill, Oxford Univ., UK; A.B. Weil, Univ. Michigan, USA

GAI07 Magnetic Anisotropy: problems and answers?

Magnetic anisotropy and in general the analysis of magnetic fabrics has become a well-known technique in the analysis of mineral fabric. It is used in many geological and geodynamical contexts as a useful tool to address a large variety of geological and paleomagnetic problems. However, the interpretation is not straightforward and many techniques and measurement routines have been developed. We invite our colleagues to report original magnetic anisotropy case studies that would help solve geological or methodological problems. We encourage contributions that would improve magnetic fabric interpretation using magnetic mineralogy considerations. Particularly welcome are any contributions presenting new analytical techniques (separation of subfabrics, microwave demagnetization in anisotropy measurements, partial remanence anisotropies, measurements at low temperature, …) or interpretations of magnetic anisotropy at the transition between different deformation states (weakly deformed sediments, mantle rocks, lava flows, shear zones, etc). Mathematical methods interpreting the orientation of magnetic minerals and/or their correlations with minerals fabrics are also welcome.

Convener: J. L. Bouchez, Université Paul-Sabatier / OMP, Laboratoire des Mécanismes de Transfert en Géologie, UMR CNRS 5563 / Equipe de Géodynamique (Pétrophysique), 38 rue des 36-Ponts, 31400 Toulouse, France; tel +33 5 61 55 64 40; fax +33 5 61 52 05 44; e-mail: bouchez@lmtg.obs-mip.fr
Co-conveners: F. Martín Hernández, Paleomagnetic Laboratory "Fort Hoofddijk", Utrecht, The Netherlands; Prof. K. Kodama, Department of Earth and Environmental Sciences, Lehigh University, USA

GAI08 Magnetic dating

With greater frequency, near- bottom magnetic surveys of sea floor, properties of the natural remanence of rocks and archeomagnetic materials (such as direction, intensity, or geomagnetic polarity), and magnetic properties (such as susceptibility) are used as chronological tools for correlation, absolute or relative dating, time scale calibration, and/or estimation of sedimentation or accumulation rates. These applications range from well established to experimental. Both, innovative and case history type contributions to the broad application of magnetic dating are invited to this symposium.

Convener: R. S. Molina Garza, Centro de Geociencias, Campus Juriquilla UNAM, Carretera, San Luis Potosí km 13, Queretaro, Mexico 76230; tel +52-442-2381104 ext. 126; fax +52-442-2381100; e-mail: rmolina@geociencias.unam.mx
Co-conveners: A. Chauvin, University of Rennes, France; R. Zhu, Beijing, China

GAI09 Rock magnetism applied to environmental problems

Rock magnetic methods can be successfully applied to a wide range of environmental problems. This symposium aims to bring together different areas of applicability of rock magnetic investigations. We welcome contributions dealing with all aspects of environmental studies, including palaeoclimate and palaeoenvironmental reconstructions derived from terrestrial and marine sediment records; sediment provenance studies; rock magnetic signatures of different types of soils; and magnetic records of recent and historical anthropogenic pollution. We especially encourage contributions involving novel and/or multi-disciplinary approaches (combining magnetic and non-magnetic methods) for solving environmental issues. Studies that can demonstrate the use of rock magnetic parameters as proxies for environmental processes (e.g., soil erosion, anthropogenic pollution, etc.) will be highly appreciated.

Convener: Neli Jordanova, Sofia, Bulgaria, Acad. Bonchev str., bl.3, 1113 Sofia; tel. ++359 2 979 39 58; fax: ++359 2 971 3005; email:vanedi@geophys.bas.bg
Co-conveners: A.P. Roberts, Southampton, U.K; .J. Orgeira, Buenos Aires, Argentina

GAI10 Theories, models and experiments in rock magnetism

Rock magnetism is the physical foundation of many diverse topics discussed in Division I symposia. Paleomagnetism , magnetic anisotropy, magnetic dating , environmental magnetism and paleointensity determination, they all depend on often detailed knowledge of the involved magnetic minerals and their properties and each subject leads to its own specific rock magnetic problems. Yet, basic theoretical questions and experimental procedures are common to all applications. New experimental possibilities in the last years considerably enlarged the rock magnetictool box, but also created a large need for theoretical investigation and calibration by models or measurements. We invite presentations focussing on such fundamental themes as physical theories of magnetic parameters in dependence of grain size or mineralogical variation, micromagnetic or phenomenological modelling of magnetization processes or new experimental techniques of wide applicability in rock magnetism.

Convener: Karl Fabian, FB Geowissenschaften, Universitaet Bremen, Postfach 330440, 28334 Bremen, Germany, tel and fax: +49 421 218 7008, e-mail kfabian@zfn.uni-bremen.de
Co-conveners: A. Newell, Santa Barbara, USA; P. Rochette, Aix-en-Provence, France

GAI11 Paleointensities - techniques and observations

This session invites contributions dealing with paleointensity investigations of the geomagnetic field at all geological timescales. We welcome abstracts focused on relative and absolute paleointensity records on both archaeological and geological time scales, and studies involving paleointensity determinations across geomagnetic reversals and excursions. Contributions dealing with methodological aspects and new techniques are particularly welcomed.

Convener: Mireille Perrin, Laboratoire Tectonophysique, UMR CNRS-UM2 5568, Université Montpellier II CC49, 34095 Montpellier Cedex 05, FRANCE; tel +33 4 67 14 39 32; fax +33 4 67 14 36 03; e-mail perrin@dstu.univ-montp2.fr
Co-conveners: M. Hill, Liverpool University, UK; Y. Yamamoto, Geological Survey of Japan, Tsukuba, Japan

GAI12 Open poster session on paleo-, rock and environmental magnetism

This open session, which will be organized solely as a poster session, is intended to bring together not only the presentations which do not fit to any other magnetic session, but mainly to provide space to results which are in certain way provoking, puzzling, ambiguous or challenging in the general sense of the word. Therefore, revise your drawers and folders and presnt your results which deserve more thorough international discussion. For instance, presentations dealing with novel interpretations of hotspots, resolved magnetic dating, intriguing paleoclimatic events, less known minerals as carriers of magnetic signal, applications to extraterrestrial bodies, etc., are mostly welcome. Besides that, we are looking for contributions presenting an integral, multidisciplinary approach to the problems that we are facing in paleo, rock and environmental magnetism.

Convener: E. Petrovsky, Geophysical Institute, Bocni II/1401, 141 31 Prague 4, Czech Republic; tel +420-2-67 103 333; fax +420-2-67 103 332; e-mail edp@ig.cas.cz
Co-convener: D. Rey, University of Vigo, Spain and H. Oda, University of Utrecht, Netherlands.

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