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X-WR-CALNAME:Laboratoire Magmas et Volcans
X-ORIGINAL-URL:https://lmv.uca.fr
X-WR-CALDESC:Évènements pour Laboratoire Magmas et Volcans
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TZID:Europe/Paris
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DTSTART:20170326T010000
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DTSTART:20191027T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20181002T140000
DTEND;TZID=Europe/Paris:20181002T170000
DTSTAMP:20260505T190806
CREATED:20180713T063049Z
LAST-MODIFIED:20181116T123050Z
UID:16269-1538488800-1538499600@lmv.uca.fr
SUMMARY:Séminaire James Farquhar
DESCRIPTION:TITRE:  Application of multiple sulfur isotopes in geochemistry. \nRésumé:  \nThe analysis of all four sulfur isotopes has the potential to provide information about reaction pathways that differentiate equilibrium from kinetic effects as well as provide information that can be used as tracers of geochemical processes.  This talk will review the basic principles that control the nature of sulfur isotope variability in terrestrial environments extending from the modern atmosphere to the ancient atmosphere\, sediments in deep geological time\, and recycling of material from ancient sediments to solid-Earth reservoirs.
URL:https://lmv.uca.fr/agenda/seminaire-james-farquhar/
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20181005T090000
DTEND;TZID=Europe/Paris:20181005T120000
DTSTAMP:20260505T190806
CREATED:20180228T134528Z
LAST-MODIFIED:20180917T114801Z
UID:15290-1538730000-1538740800@lmv.uca.fr
SUMMARY:Conseil de Laboratoire
DESCRIPTION:
URL:https://lmv.uca.fr/agenda/conseil-de-laboratoire-5/
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20181008T140000
DTEND;TZID=Europe/Paris:20181008T170000
DTSTAMP:20260505T190806
CREATED:20180712T093500Z
LAST-MODIFIED:20180921T071445Z
UID:16262-1539007200-1539018000@lmv.uca.fr
SUMMARY:Séminaire George Bergantz
DESCRIPTION:Title : The Magic of Magma (Mush) \nAbstract: \nMagmatic systems are now understood be dominated by crystal-rich mushy conditions\, yet the kinematics and dynamics of magma mush are poorly understood. They are not generally elastic media\, nor a sponge\, nor a dirty fluid\, nor amenable to treatment as a simply-connected continuum. It is a loose endoskeleton\, sitting in a pool of silicic melt\, and both contribute to the unique behaviors that are recorded in natural examples. In this presentation we will review the unique and fascinating physics of hydrogranular systems and apply those to geological examples of mush unlocking\, mixing\, shear zone formation\, magmatic fabrics and so on. The key piece of physical logic is the notion of a granular force chain\, and we will explore how this allows for a new understanding of how failure is defined and propagates as a cascade through the granular network from the micro to the macro scale.
URL:https://lmv.uca.fr/agenda/seminaire-george-bergantz/
CATEGORIES:Séminaire
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BEGIN:VEVENT
DTSTART;VALUE=DATE:20181011
DTEND;VALUE=DATE:20181012
DTSTAMP:20260505T190806
CREATED:20180629T075717Z
LAST-MODIFIED:20180629T075717Z
UID:16179-1539216000-1539302399@lmv.uca.fr
SUMMARY:Fête de la Science
DESCRIPTION:
URL:https://lmv.uca.fr/agenda/fete-de-la-science/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20181016T140000
DTEND;TZID=Europe/Paris:20181016T170000
DTSTAMP:20260505T190806
CREATED:20180913T150632Z
LAST-MODIFIED:20181106T094809Z
UID:16476-1539698400-1539709200@lmv.uca.fr
SUMMARY:Séminaire de Antonin Laurent
DESCRIPTION:Titre: Metamorphism at extreme conditions\, what information can be gathered from monazite and zircon behaviour? \n  \n \n  \nRésumé: \nUltrahigh-temperature (UHT) and ultrahigh-pressure (UHP) metamorphic rocks have been recognized in a variety of geodynamic setting and are considered to play an important role in deciphering lithosphere evolution. Unravelling the evolution of such terrains in terms of melting duration\, fluid-flow and ore genesis usually requires the use of the U–(Th)–Pb chronometers in zircon and monazite. Both minerals show complex chemical zoning at the µm- to nm-scale that can be used to identify growth processes and link them to monazite and zircon crystallization environment like mineral paragenesis and P–T–fluids conditions. However\, the wide diversity of internal texture observed in zircon and monazite also largely reveals modification of pre-existing structures during metamorphism without changing the external shape of the grain. This presentation will highlight some complexities where chemical zoning do not always coincide with age zoning derived from U-Th-Pb isotopes. In a first part\, we compare in detail the mineralogical and U–Pb isotopic response of zircon and monazite during repeated granulite facies events reaching ultra-high temperature in the Rogaland basement (South Norway). In a second part\, this presentation will discuss the potential for S-bearing monazite to record the redox condition of its crystalizing medium through time and to probe the presence of sulfur in geological fluids at UHT and UHP.
URL:https://lmv.uca.fr/agenda/seminaire-de-antonin-laurent/
CATEGORIES:Séminaire
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