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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:20180325T010000
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DTSTART:20181028T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190304T140000
DTEND;TZID=Europe/Paris:20190304T150000
DTSTAMP:20260505T044404
CREATED:20190214T124128Z
LAST-MODIFIED:20190214T124128Z
UID:17296-1551708000-1551711600@lmv.uca.fr
SUMMARY:VolcaPot de Johan (Yoshi) Gilchrist
DESCRIPTION:Sediment waves in multiphase jets: A mechanism for the collapse of Plinian eruption columns \nPlinian eruptions often form stable eruption columns that feed an ash umbrella cloud spreading in the atmosphere. The source conditions at the vent change during the eruption and can cause the eruption column to destabilize\, leading to partial or total column collapse and the formation of Pyroclastic Density Currents (PDCs). Alternating layers\, characterized by tephra fall from the umbrella cloud and PDCs from column collapse\, are commonly observed in vent-proximal Plinian eruption deposits. This layering has been ascribed to abrupt changes in the source conditions at the vent that cause the eruption column to oscillate between stable and unstable regimes. This\, however\, conflicts with correlated medial and distal tephra fall layers\, which imply smooth changes in the source conditions. To investigate the effect of changing source conditions on the stability of eruption columns\, we conduct analogue laboratory experiments injecting sand-laden water jets into a 3D water tank with a linear density stratification. As the momentum flux of the jet decreases\, jet columns destabilize and periodically collapse through the action of sediment waves falling from the top of the jet. Sediment waves change continuously with source conditions\, becoming larger and falling faster as the source momentum flux decreases and jet columns transition from the partial to total collapse regimes. In the partial collapse regime\, a spreading umbrella cloud is continuously fed by the jet column while falling sediment waves periodically collapse to produce gravity currents on the tank floor. We argue that alternating tephra fall and PDC layers in proximal Plinian eruption deposits imply partial collapse of the eruption column through the action of sediment waves. Sediment waves emplace proximal deposits with axisymmetric ring structures\, which may serve as diagnostic features marking the occurrence of periodic column collapse in ancient eruptions.
URL:https://lmv.uca.fr/agenda/volcapot-de-johan-yoshi-gilchrist/
LOCATION:LMV: salle des séminaires
CATEGORIES:VolcaPot
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190305T140000
DTEND;TZID=Europe/Paris:20190305T170000
DTSTAMP:20260505T044404
CREATED:20181005T123801Z
LAST-MODIFIED:20190503T092242Z
UID:16664-1551794400-1551805200@lmv.uca.fr
SUMMARY:Séminaire Olivier Bachman
DESCRIPTION:« Dynamics of transcrustal magmatic systems\, and their consequences on volcanic behaviour”.
URL:https://lmv.uca.fr/agenda/seminaire-olivier-bachman/
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190312T140000
DTEND;TZID=Europe/Paris:20190312T170000
DTSTAMP:20260505T044404
CREATED:20181017T105146Z
LAST-MODIFIED:20190329T120208Z
UID:16713-1552399200-1552410000@lmv.uca.fr
SUMMARY:Séminaire de Renaud Deguen
DESCRIPTION:« Dynamics of core-mantle differentiation and equilibration » \nThe basic structure of the terrestrial planets – an iron-rich metallic core surrounded by a silicate mantle – has been set during the accretion of the planets\, when the high temperature allowed the metal and silicate phases to melt and separate. The amount of transfert of chemical elements and heat between the metal and silicates that occurred during this differentiation process is critical for the composition and initial temperature of the core and mantle. I will present recent results on the dynamics of metal/silicates equilibration during core formation\, with a focus on the physical mechanisms behind metal-silicates equilibration and metal fragmentation.
URL:https://lmv.uca.fr/agenda/seminaire-de-renaud-deguen/
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190315T110000
DTEND;TZID=Europe/Paris:20190315T120000
DTSTAMP:20260505T044404
CREATED:20190315T141834Z
LAST-MODIFIED:20190315T141834Z
UID:17534-1552647600-1552651200@lmv.uca.fr
SUMMARY:X-Pot - Bilan du thème "Magmatisme et Différentiation Planétaire"
DESCRIPTION:X-Pot – Bilan du thème « Magmatisme et Différentiation Planétaire » \nSalle Chaîne des Puys
URL:https://lmv.uca.fr/agenda/x-pot-bilan-du-theme-magmatisme-et-differentiation-planetaire/
END:VEVENT
BEGIN:VEVENT
DTSTART;VALUE=DATE:20190319
DTEND;VALUE=DATE:20190322
DTSTAMP:20260505T044404
CREATED:20190314T092327Z
LAST-MODIFIED:20190314T092327Z
UID:17510-1552953600-1553212799@lmv.uca.fr
SUMMARY:Visite Tohoku University
DESCRIPTION:Afin de mettre en place des collaborations tant au niveau de la recherche que de l'enseignement\, 3 chercheurs de l'Université de Tohoku (dont Yo Fukushima que vous connaissez peut être) nous rendent visite pour 3 jours les 19-20 et 21 mars. Les collaborations qu'ils souhaitent mettre en place pourraient amener à des échanges d'étudiants et de post-doctorants. \nAfin de mieux cerner les interactions scientifiques possibles\, nous organisons un mini workshop sur 1 jours - 1 jour et demi\, le mercredi 20 et jeudi 21 mars.\nLes thèmes de recherches qui sont les plus porteur pour l'université de Tohoku concernent la volcanologie physique\, l'aléas et le risque et enfin les expériences haute pression.
URL:https://lmv.uca.fr/agenda/visite-tohoku-university/
ATTACH;FMTTYPE=image/jpeg:https://lmv.uca.fr/wp-content/uploads/2019/03/images.jpeg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190322T104500
DTEND;TZID=Europe/Paris:20190322T124500
DTSTAMP:20260505T044404
CREATED:20190315T141442Z
LAST-MODIFIED:20190315T141442Z
UID:17532-1553251500-1553258700@lmv.uca.fr
SUMMARY:X-Pot - Bilan du thème "Volatils"
DESCRIPTION:X-Pot – Bilan du thème « Volatils » \nSalle des Séminaires
URL:https://lmv.uca.fr/agenda/x-pot-bilan-du-theme-volatils/
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190322T140000
DTEND;TZID=Europe/Paris:20190322T150000
DTSTAMP:20260505T044404
CREATED:20190315T153811Z
LAST-MODIFIED:20190315T153859Z
UID:17537-1553263200-1553266800@lmv.uca.fr
SUMMARY:VolcaPot Giliann Sauret et Mohamed Bouafas
DESCRIPTION:Réalité virtuelle pour la prévention des risques géologiques \nDans le cadre du projet européen 3DTeLC pour l’enseignement\, l’apprentissage et la communication des risques naturels\, Giliann Sauret et Mohamed Bouafas présenterons le projet de reconstruction et de visualisation des modèles du Lemptegy et du Dallol en réalité virtuelle au moyen du moteur 3D Unity.
URL:https://lmv.uca.fr/agenda/volcapot-giliann-sauret-et-mohamed-bouafas/
LOCATION:LMV: salle des séminaires
CATEGORIES:VolcaPot
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190326T140000
DTEND;TZID=Europe/Paris:20190326T170000
DTSTAMP:20260505T044404
CREATED:20181129T080708Z
LAST-MODIFIED:20190502T080506Z
UID:16879-1553608800-1553619600@lmv.uca.fr
SUMMARY:Séminaire de Karen Fontijn
DESCRIPTION:Regional Tephrostratigraphic Frameworks: Applications and Challenges \n  \n \nDetailed stratigraphic studies of pyroclastic deposits form arguably the best tool to estimate the frequency and magnitude of explosive eruptions at volcanoes where limited or no historical records exist. As such tephrostratigraphy forms a first-order assessment of potential future eruptive behavior at poorly known volcanoes. Alternations of soils and pyroclastic deposits at proximal to medial distances of the volcano however typically only allow reconstructing eruptive behavior within the Holocene. Moreover\, they only tend to preserve relatively large explosive eruptions\, of magnitude 3-4 and above\, and therefore almost invariably form a biased view of the frequency-magnitude relationships at a particular volcano. Long lacustrine records in medial to distal regions offer significant potential to obtain a more complete view of the explosive eruptive record as they often preserve thin fine-grained tephra deposits representing either small-scale explosive eruptions not preserved on land\, or distal ash deposits from large explosive eruptions. Furthermore\, these sedimentary records often contain material that can be dated to establish a detailed age-depth model that can be used to date the eruptions and estimate the tempo of activity. \nIn settings where volcanoes and lakes closely co-exist\, integrating terrestrial and lacustrine data therefore allows the development of regional-scale tephrostratigraphic frameworks. Such frameworks provide a view of temporal trends in volcanic activity and mid/long-term eruptive rates on a regional scale rather than at the level of an individual volcano\, i.e. in interaction with regional tectonic stress regimes. They also highlight the spatial distribution of deposits from large explosive eruptions\, allowing improved estimates of magnitudes of individual eruptions as well as of frequency of impact by volcanic ash in specific regions. Provided such tephra horizons are well characterized and dated they can be used as age marker horizons and help fine-tune age models for palaeoenvironmental studies. In this presentation I will highlight a few key examples of both local and regional-scale tephrostratigraphic frameworks in Indonesia\, Chile and Ethiopia\, and discuss the multidisciplinary applications as well as challenges posed by data acquisition.
URL:https://lmv.uca.fr/agenda/seminaire-de-karen-fontijn/
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190328T110000
DTEND;TZID=Europe/Paris:20190328T123000
DTSTAMP:20260505T044404
CREATED:20190207T110010Z
LAST-MODIFIED:20190207T110010Z
UID:17206-1553770800-1553776200@lmv.uca.fr
SUMMARY:X-Pot le jeudi 28 mars 2019 - Laura Creon - IMPMC - Paris
DESCRIPTION:« New approach for mantle-CO2 quantification in magmatic processes »
URL:https://lmv.uca.fr/agenda/x-pot-le-jeudi-28-mars-2019-laura-creon-impmc-paris/
LOCATION:LMV Salle Chaine des Puys
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