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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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