European Geosciences Union (EGU) General Assembly

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Start Date: 
Sunday, April 27, 2014
End Date: 
Friday, May 2, 2014

Location: Austria Center Vienna, Vienna, Austria

Web: http://www.egu2014.eu/home.html

Includes the following sessions:


GMPV20 Granites - Archaean to present

Convenors: Jean-Francois Moyen (jean.francois.moyen@univ-st-etienne.fr), Tracy Rushmer, Michael Brown (mbrown@umd.edu)

Granitoids are the dominant component of the continental crust. This session examines all aspects of granite petrology and geochemistry: the formation and extraction of melts; the processes that control the evolution from melt to granite; the emplacement, cooling and textural development of granites; the ore systems associated. Contributions from the fields of experimental petrology, geochemistry, mineralogy, field studies, etc. are welcome in this session. A particular focus of this session is the long term evolution of granitic magmatism, from the past to the present.


GMPV21/TS7.9 Interplay of magmatism and plate tectonic processes in a complex geodynamic setting - case studies in the Mediterranean and surrounding regions

Convenors: Szabolcs Harangi (szabolcs.harangi@geology.elte.hu), Michele Lustrino (michele.lustrino@uniroma1.it), Prelevic Dejan (prelevic@uni-mainz.de)

Can plate-tectonic concepts explain the origin of the magmas and the style of magmatism? Can our models on magma generation and evolution be used to understand the geodynamic evolution of an area? In the Mediterranean region a wide range of magmas (from strongly silica undersaturated carbonatites, silico-carbonatites and melitilites to strongly silica-oversaturated rhyolites) erupted for the last 50 Myr. They are related to a range of tectonic processes such as continental rifting and drifting, lithospheric boudinage, back-arc basin opening, formation of volcanic arcs and orogens, all of these linked in some way to the convergence between African and Eurasian plates and the associated micro-plates. Although there have been rapidly growing petrologic and tectonic models a number of highly controversial questions still remain. In this session we aim discussing the state-of-art particularly focusing on the origin of the magmas in this complex geodynamic setting.

We encourage the submission of contribution mostly in the following key issues: (1) Origin of magmas with ‘subduction signature’ in a post-collision setting: how such magmas can form without coeval subduction? (2) Origin of the alkaline sodic magmas in orogenic areas following or partly overlapping the calc-alkaline magmatism: are there any common points in the petrogenesis of the alkaline sodic magmas in the Mediterranean area and the western and central Europe rift zones? (3) Structural controls on the magmatism in complex areas: is it plate-tectonic controlled or deep mantle process controlled? (4) Presence of carbonatites and carbonate-rich igneous rocks: are these exotic compositions coming from the deep mantle or are the results of a normal CO2-bearing upper mantle?


GD3.4/GMPV27/SM6.16 Plumes and hotspots: paradigms, models, and implications

Convenors: Carole Cordier (carole.cordier@ujf-grenoble.fr), Nicholas Arndt (nicholas.arndt@ujf-grenoble.fr), Anne Davaille

This session will focus on the origin of magmatism in intraplate tectonic settings. Questions to be discussed include whether such magmas form in mantle plumes or by alternative mechanisms; the nature, composition, temperature and other physical characteristics of the source; the depth of instigation, the structure, and the dynamics of plumes, etc. Contributions from the fields of geochemistry, petrology, volcanology and geodynamics will be welcome.


GMPV33/TS3.5 Physics of volcano plumbing systems

Convenors: Olivier Galland (olivier.galland@fys.uio.no), Steffi Burchardt, Eoghan Holohan (holohan@gfz-potsdam.de), Matthieu Kervyn (makervyn@vub.ac.be), Benoit Taisne

Volcanic systems evolve through the interaction of numerous processes governing the ascent, emplacement and eruption of magma. These highly-dynamic processes operate and interlink on scales of millimetres to kilometres, from the Mantle to the Earth’s surface, and involve complex physics that are challenging to tackle. Understanding the physics of volcanic systems, whether single edifices or volcanic fields, is nonetheless crucial for forecasting the location, style and violence of volcanic eruptions, and for providing accurate hazard and risk assessments.

This session aims to bring together those who address the physical and temporal development of sub-volcanic and volcanic phenomena by using field or geophysical observations, theoretical or analytical solutions,, and experimental or numerical models . This session includes, but is not restricted to, the following topics:

  • Physics of melt segregation in magmatic sources;
  • Fluid mechanics of crystal-bearing melts;
  • Fracture mechanics in rocks related to dyke, sill and cone sheet emplacement;
  • Deformation of both magma and host rock related to pluton and laccolith emplacement;
  • Effects of regional-tectonics on intrusions, edifices and volcanic fields;
  • Prediction of volcanic vent location and distribution;
  • Fragmentation of the magma and the host rock during magmatic and phreatomagmatic explosions;
  • Dynamics of volcanic jets and plumes;
  • Depositional processes in turbulent flows.

 

This session is process-oriented, and it aims to trigger cross-disciplinary interactions. We therefore strongly encourage comparisons and validation of modelling results with field and/or geophysical observations, as this is a crucial step toward fully unravelling the complex processes beneath, within and upon volcanoes.


GMPV41/SSP4.8 Mass extinctions and rapid global warming in deep time

Convenors: Sverre Planke (planke@vbpr.no), Wolfram Kuerschner (w.m.kuerschner@geo.uio.no), Richard Ernst (richard.ernst@ernstgeosciences.com), Henrik Svensen

Mass extinction and global warming events in Earth history are often temporarily associated with the eruption of Large igneous provinces (LIPS), e.g. the end-Permian, the end-Triassic, and the Paleocene-Eocene Thermal Maximum (PETM) events. Currently, LIPS and their effects on ancient crises are hot research topics. In this session, we invite a broad range of contributions on Earth crises in the Phanerozoic times. We envision a session where experts from different fields can meet and share new ideas and data that may shed new light on some of the biggest extinction and climate events in Earth history. Session topics include igneous intrusive and extrusive rates and processes, formation and faith of volcanic and metamorphic gases, proxy data from sedimentary sequences, the fossil extinction records, and climate modeling.


GMPV42/ERE3.2/TS3.7 Ore deposits: origin, exploration and mining

Convenors: Nicholas Arndt (nicholas.arndt@ujf-grenoble.fr), Mei-Fu Zhou, John Ludden (jludden@bgs.ac.uk), Christina Wang (wyanang@hotmail.com)

This session will deal with theories of origin of all types of ore deposits as well as techniques used to find and mine them. The emphasis will be on deposits in Europe but contributions on deposits in other regions will be welcome. Issues related to the environmental impact of mining and the "social licence to mine" could also be discussed. Of particular interest is the relationship between mineral deposits and supercontinental cycles. It is well known that some mineralization events were related to assembly and breakup of supercontinents, and deposits in certain regions may be comparable to those in previously adjacent blocks. We welcome contributions about mineral deposits whose formation is linked with either the breakup or assemblage of superconitnents, including Columbia, Rodinia and Gondawanaland. These deposits include stratiform sediment-hosted copper deposits formed in the great oxidization events during the assemble of Columbia, Proterozoic iron-oxide copper gold (IOCG) deposits, orogenic gold deposits, and super plume related magmatic ore deposits.


GMPV48 Mantle roots of deep seated magmas. Origin and evolution of layered mantle lithosphere in different geodynamic settings

Convenors: Igor Ashchepkov (igor.ashchepkov@igm.nsc.ru), Evgenii Sharkov (sharkov@igem.ru), Yana Fedorchuk

Possible topics:

Mantle roots of deep seated magmas. Mntle inclusions in different types of the magmas in intraplate, arc and oceanic island magmatism containing major information about composition, structure and processes of mantle evolution in different tectonic settings. Magmas are sampling mainly their way to the surface and allow to reconstruct the polybaric conduit and chamber systems and wall rocks. The mechanisms of melt mantle magmas transformation during their rise.

Intraplate magmatism allows to judge about composition and thermal conditions and heterogeneity of the mantle and it modification by plume and subduction related melts. Magma compositions depend on structure of magmatic systems, and changing their primary features due to differentiation, mixing and contamination by country rocks.

Key questions are:

  1. Subdivision from the xenoliths sets primary varieties and melt modified types in the different levels of mantle columns. Reconstruction of primary mantle layering and position of the fusion zones primary host rock composition, PTXFO2 conditions, degree of hydration and accounting the chemistry and the physics of intruding melts and deriving fluids.
  2. Dynamics of the developing of melt conduits accounting mantle layering.
  3. Role and mechanism of presiding metasomatism in the transformation of mantle melts.

 

The questions for xenoliths in alkali basalts: (1) depth of the generation of mantle diapirs and mechanism of the emplacement and divergence of the mantle material during uplift, what was the reason of rising of structure of mantle diapirs and possible role of the plumes (or fluid flows) in their generation. The key questions for xenoliths from the cratonic lithosphere are: (1) signs and methods of mantle layering detection changes of mantle and variations of lithology in space in time using petrological, geochemical and geophysical techniques; (2) growth mechanisms of the continental lithosphere accounting the melting of submerging slabs and possible interaction with plums and rising melts; (3) types of mantle metasomatism and their relationship to tectonic setting; (4) mechanisms of melt migration through the lithosphere, etc.

The special interest is also spatial and compositional distribution of magmatic system within large igneous provinces (LIPs); (5) evolution of LIPs in time and its reasons.


GD6.1/GMPV54/SM6.5/TS8.4 The African continent - large-scale crust and mantle geodynamic processes

Convenors: Manel Fernandez (mfernandez@ictja.csic.es), Susan Webb, Jorg Ebbing (joerg.ebbing@ngu.no), Dominique Frizon De Lamotte

The African continent covers a very wide range of tectonothermal ages; it is affected by well-known deep geodynamic processes such as mantle plumes, continental rifting, and Alpine compression; and has recently been the target of regional and global geological and geophysical studies. The aim of this topical session is to bring together the main results of these recently finalized or still ongoing projects/studies to have a multidisciplinary approach on the large-scale geodynamic processes affecting the African continent. Therefore, a wide range of contributions are welcome (geodynamics, tectonophysics, tectonics, geochemistry, numerical and analogue modeling, seismics, seismology, potential fields, geomorphology, etc.) with the only condition that deal with large-scale regions/processes in Africa.

Invited speakers:
Carla Bratenberg
Ray Durrheim
Stewart Fishwick
Francois Guillocheau
Nick White


PS2.6 Volcanism, tectonics, impacts and other geological processes across the solar system

Convenors: Thomas Platz (thomas.platz@fu-berlin.de), Alexander Deutsch (deutsca@uni-muenster.de), Harald Hiesinger, Fred Jourdan (f.jourdan@curtin.edu.au), Matteo Massironi (matteo.massironi@unipd.it), Pascal Allemand (pascal.allemand@univ-lyon1.fr), Stephanie Werner, Paul Bryne (pbyrne@dtm.ciw.edu)

Geological processes such as volcanism, tectonics, and impacts are fundamental to the formation and evolution of the planets, moons, asteroids and comets of our Solar System. These processes are the primary agents responsible for the shaping of planetary surfaces, each of them in different ways and at different rates. For example, asteroids and comets have played a critical role during planetary evolution, by delivering the primary constituents of planetary bodies and by promoting resurfacing via impacts. Volcanic and tectonic processes are efficient mechanisms to reshape planetary surfaces and provide valuable information about planetary interiors and evolution. The study of geological processes in the Solar System is at the crossroad of many scientific disciplines using either in-situ sampling and analysis, remotely sensed data, or experimental and numerical modelling.

This session aims to compile all facets of volcanism, tectonism, impact cratering, and their associated interactions with other geological processes observed in our Solar System. By providing a forum for a broad range of discussions, these observations and interpretations will be investigated and (re)viewed in the light of our current understanding of related processes on Earth. Comparative studies on volcanic/tectonic systems, impact structures, and other processes on Earth using multi-instrumental, remotely sensed, experimental, computational, or field data are particularly welcome.

City: 
Vienna, Austria