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X-WR-CALDESC:Évènements pour Laboratoire Magmas et Volcans
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DTSTART:20180325T010000
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DTSTART:20190331T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190912T110000
DTEND;TZID=Europe/Paris:20190912T120000
DTSTAMP:20260504T152919
CREATED:20190904T132304Z
LAST-MODIFIED:20190904T132304Z
UID:20094-1568286000-1568289600@lmv.uca.fr
SUMMARY:X-Pot Diego NARVAEZ
DESCRIPTION:Study of primitive olivine-hosted melt inclusions from the Ecuadorian segment of Northern Volcanic Zone \n  \nThe contribution of the different geochemical reservoirs (slab-mantle-crust) to arc magma genesis is a long-lasting discussion in the scientific community. The nature of the initial slab component triggering the melting of the mantle wedge is difficult to constrain since arc magmas undergo compositional changes during their crustal residence before eruption. The adakite-signature and high Th/Nb and Th/La of magmas from Ecuador are thought to beinherited from a hydrous siliceous melt slab component or from a lower- to mid-crustal process of mantle melts. \nWe present new analysis of major\, trace and volatile elements of a group of relatively rare melt inclusion (MI) hosted in primitive olivines (Fo_80-90 ) from 5 Ecuadorian volcanoes that sit upon a ~50 km-thick crust. These MIs come from Cotacachi\, Cubilche and Sangay volcanoes\, as well as Tulabug and Cono de la Virgen (CLV) cones. These MIs display ultrabasic to basic compositions (42.0-51.8 wt.%. SiO_2 ) and fall_in the field of basalts\, trackybasalts and tephrite basanites in the TAS diagram. On the basis of trace elements\, we recognize two different slab components added to the mantle wedge below the Ecuadorian arc. One that is rich in fluid-mobile (Ba/La: 30-110 and Pb/Ce: 0.1-0.5\, B/Nb: up to 22) and poor in fluid-immobile elements (La/Nb: 2.2-4\, Th/Nb: up to 0.7) observed everywhere\, except for MIs coming from CLV. The other that is relatively enriched in fluid-immobile elements (La/Nb:7.2-15.5\, Th/Nb: up to 3.2) and has low fluid-mobile elements contents (Ba/La: 15-36 and Pb/Ce: 0.02-0.1\, B/Nb: up to 4.4). Using arc basalt simulator 3 (Kimura et al. 2010)\, we found that one group of MI (from Cotacachi\, Cubilche\, Tulabug and Sangay) compositions are consistent with the addition to the mantle wedge of 2-5% of an aqueous fluid-like slab component and a second group (CLV) with the addition of 10-20% of a hydrous siliceous melt. This work reveals that high (La/Yb)_N\, Th/Nb and Th/La is a characteristic of some primitive magmas before any crustal interaction affects their composition.
URL:https://lmv.uca.fr/agenda/x-pot-diego-narvaez/
CATEGORIES:PetroPot
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190917T140000
DTEND;TZID=Europe/Paris:20190917T170000
DTSTAMP:20260504T152919
CREATED:20190719T142242Z
LAST-MODIFIED:20190827T091422Z
UID:19703-1568728800-1568739600@lmv.uca.fr
SUMMARY:Séminaire Marion Garçon
DESCRIPTION:Et si les continents Archéens ressemblaient aux continents modernes
URL:https://lmv.uca.fr/agenda/marion-garcon/
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190920T140000
DTEND;TZID=Europe/Paris:20190920T150000
DTSTAMP:20260504T152919
CREATED:20190917T070217Z
LAST-MODIFIED:20190917T101416Z
UID:20443-1568988000-1568991600@lmv.uca.fr
SUMMARY:Géoch'Pot en salle des séminaires le vendredi 20 septembre à 14h
DESCRIPTION:Bonjour à tous\, \nC’est la rentrée du Géoch’Pot et pour fêter ça nous allons recevoir Matthew Jerram qui est en fin de thèse avec Pierre Bonnand. Il nous parlera du comportement du chrome pendant la cristallisation des coulées de komatiites. \nRendez-vous donc le 20 septembre à 14h en salle des séminaires. Venez nombreux ! \nMartin \n  \n 
URL:https://lmv.uca.fr/agenda/geochpot-en-salle-des-seminaires-le-vendredi-20-septembre-a-14h/
LOCATION:LMV: salle des séminaires
CATEGORIES:Géoch’Pot
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190924T110000
DTEND;TZID=Europe/Paris:20190924T120000
DTSTAMP:20260504T152919
CREATED:20190903T131021Z
LAST-MODIFIED:20190903T131021Z
UID:20078-1569322800-1569326400@lmv.uca.fr
SUMMARY:Séminaire de Mariana Jacome Paz
DESCRIPTION:Titre: « Beyond social vulnerability in the Zoque community\, Chichón volcano\, México. Geoconservation as a risk mitigation approach »
URL:https://lmv.uca.fr/agenda/seminaire-de-mariana-jacome-paz/
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190925T110000
DTEND;TZID=Europe/Paris:20190925T120000
DTSTAMP:20260504T152919
CREATED:20190903T131120Z
LAST-MODIFIED:20190903T131120Z
UID:20080-1569409200-1569412800@lmv.uca.fr
SUMMARY:Séminaire de Guillaume Boudoire
DESCRIPTION:Titre: « Contraindre les systèmes magmatiques et les dynamiques associées via les espèces gazeuses de faible solubilité: le cas du Piton de la Fournaise (La Réunion\, France) »
URL:https://lmv.uca.fr/agenda/seminaire-de-guillaume-boudoire/
CATEGORIES:Séminaire
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20190926T110000
DTEND;TZID=Europe/Paris:20190926T120000
DTSTAMP:20260504T152919
CREATED:20190903T131208Z
LAST-MODIFIED:20190914T080205Z
UID:20082-1569495600-1569499200@lmv.uca.fr
SUMMARY:Séminaire de Damien Gaudin
DESCRIPTION:Titre: »Quantifier l’activité volcanique: zones fumerolliennes\, activité Strombolienne et foudre volcanique à l’heure du Big Data. »
URL:https://lmv.uca.fr/agenda/seminaire-de-damien-gaudin/
CATEGORIES:Séminaire
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