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PRODID:-//Laboratoire Magmas et Volcans - ECPv6.15.20//NONSGML v1.0//EN
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X-ORIGINAL-URL:https://lmv.uca.fr
X-WR-CALDESC:Évènements pour Laboratoire Magmas et Volcans
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DTSTART:20170326T010000
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20180301T090000
DTEND;TZID=Europe/Paris:20180301T110000
DTSTAMP:20260530T045137
CREATED:20180228T133522Z
LAST-MODIFIED:20180228T133522Z
UID:15278-1519894800-1519902000@lmv.uca.fr
SUMMARY:Comité de direction
DESCRIPTION:
URL:https://lmv.uca.fr/agenda/comite-de-direction-5/
LOCATION:LMV Salle Chaine des Puys
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20180301T130000
DTEND;TZID=Europe/Paris:20180301T140000
DTSTAMP:20260530T045137
CREATED:20180223T100039Z
LAST-MODIFIED:20180223T100039Z
UID:15228-1519909200-1519912800@lmv.uca.fr
SUMMARY:Petro-Pot Ken Koga
DESCRIPTION:Fractionation of fluorine and chlorine during subduction zone metamorphism and arc magma composition \nAbstract: Fluorine and chlorine are found in magmatic gas/fluid phases in trace quantity along with H2O\, CO2\, and SO2. Because of halogens’ sluggish volatility\, compared to H2O and CO2\, fluorine and chlorine are ideal geochemical tracers of the magmatic volatile component for the subduction zone magmas. Using these element\, it is possible to investigate the role of volatile component in arc magma genesis\, from subduction of the slab\, metamorphism-metasomatism\, to partial melting. One of key unknown of the fluorine-chlorine geochemical cycle in the subduction zone is the subduction input; the quantity of these elements added to the arc mantle through the subduction. In Western Alps\, pieces of Mesozoic Ligurian-Piemonte oceanic lithosphere are found today. These rock bodies have recorded range of maximum pressure conditions from the essentially surface to eclogite facies. Conveniently\, it is possible to sample the same oceanic slab that is exposed to the different stages of the subduction depth. This presentation reports the results of the studies of these ophiolites\, identifying the geochemical evolution of descending slab\, and subsequent introduction of fluorine and chlorine to the arc mantle.
URL:https://lmv.uca.fr/agenda/petro-pot-ken-koga/
LOCATION:LMV Salle Chaine des Puys
CATEGORIES:Séminaire
ATTACH;FMTTYPE=image/jpeg:https://lmv.uca.fr/wp-content/uploads/2018/02/1168891_840811029279584_411464004_n.jpg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20180305T140000
DTEND;TZID=Europe/Paris:20180305T150000
DTSTAMP:20260530T045137
CREATED:20180216T124525Z
LAST-MODIFIED:20180216T124613Z
UID:14955-1520258400-1520262000@lmv.uca.fr
SUMMARY:VolcaPot: Sara Di Salvo et Yannick Le Moigne
DESCRIPTION:VolcaPot 5 Mars 2018 à 14h: deux présentations. \n\nSara Di Salvo:\n\nUnravel magmatic system dynamics through in situ isotopic micro-analyses: insights into the Campanian Ignimbrite activity (Campi Flegrei\, Italy) \nLarge compositional variations in ignimbrites reflect significant zoning in shallow magma reservoirs and represent an excellent source of information on magma storage conditions and volcanic evolutionary processes. Configuration of these magma chambers is still not clear\, so its knowledge represents an important task to better understand how emptying dynamics work during large explosive eruptions. \n The Campanian Ignimbrite (CI) eruption\, from Campi Flegrei volcanic field\, Italy\, represents a typical example of such events\, producing a voluminous pyroclastic sequence of trachytic to phonolitic magma around 39 ka ago. Great whole-rock geochemical variations are reported in literature and considerable isotopic dataset exists for products from medial CI outcrops\, suggesting Sr-isotope disequilibria. Nevertheless\, less is known about the isotopic variations in stratigraphic sections of CI from proximal outcrops\, despite its more detailed sequences in the field and the more remarkable heterogeneity of its components. In order to provide a complete picture of the compositional variability within the proximal CI sequences\, we have performed geochemical and isotopic micro-analyses on matrix glasses of all juvenile components of the proximal CI. Samples were collected along six different proximal CI outcrops from all the six stratigraphic units recognised for the proximal CI sequence. Our major and trace element data on matrix glasses and Sr-Nd isotopes point out a much larger geochemical heterogeneity than that already displayed by whole-rock data. \n Moreover\, our detailed micro-analytical data show a compositional complexity even at the micro-scale\, possibly revealing the presence of multiple magma components in the CI system interacting in a complex magmatic network. Recent hypotheses have suggested that the CI magma reservoir evolved by incremental addition of deeper recharge into a high-crystallinity region (i.e. crystal mush)\, from which crystal-poor melts were extracted. In this light\, the present work also contributes to better understand crystal mush systems linked to highly explosive eruptions\, through a detailed in situ isotopic micro-analytical study. \n  \n\nYannick Le Moigne\n\nInvestigating Canada’s deadliest volcanic eruption and mitigating future hazards \nTseax volcano is a small scoria cone associated with a 32 km-long basanite/hawaiite lava flow in NW British Columbia (Canada) and the site of one the youngest and deadliest volcanic eruptions in Canada. An eruption on the mid-1700s killed an estimated 2000 people of the Nisga’a Nation living in two villages near the volcano. A rich oral history has preserved detailed observational accounts of the eruption\, however\, the exact cause of the fatalities remains unclear. Moreover\, only a limited number of scientific studies exist for Tseax\, and thus many questions still need to be addressed.\n Field observations and petrophysical data are characteristics of a very low viscous lava flow and suggest a rapid expension of the flow. Our models show that a large volume and a low viscosity lava emitted during a short period of time could effectively reach the location of the two ancient Nisga’a villages and thus cause fatalities.\n The aim is to establish the sequence and duration of the volcanic events responsible for one Canada’s worst natural disasters through chemical and physical modelling of the eruption. \n 
URL:https://lmv.uca.fr/agenda/volcapot-sara-di-salvo-et-yannick-le-moigne/
CATEGORIES:VolcaPot
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20180306T140000
DTEND;TZID=Europe/Paris:20180306T160000
DTSTAMP:20260530T045137
CREATED:20180108T135219Z
LAST-MODIFIED:20180307T082538Z
UID:14404-1520344800-1520352000@lmv.uca.fr
SUMMARY:Séminaire de Roberto Agrusta
DESCRIPTION:Le mardi 6 Mars à 14h dans l’amphi du LMV\, Roberto Agrusta (LGTPE Lyon) présentera ses travaux sur : \nSlab-transition zone interaction: what drives and resists plate sinking through the transition zone \nIn the present-day Earth\, as subducting plates reach the base of the upper mantle\, some appear to flatten and stagnate\, while others seemingly go through unimpeded into the lower mantle. This variable resistance to slab sinking has been proposed to affect long-term thermal and chemical mantle circulation. Several constraints and dynamic models highlight that neither the increase in viscosity between upper and lower mantle nor the coincident endothermic phase transition in the main mantle silicates suffice to stagnate slabs. However\, together the two provide enough resistance to stagnate subducting plates\, if they subduct accompanied by significant trench retreat. Slab models with plate-like rheology lead to similar styles of morphologies as those revealed by seismic tomography\, where strong slabs and mobile plate boundaries favouring stagnation for old and penetration for young slabs. However\, such transition zone iterations do not seem a permanent feature\, for example none of the current transition-zone slabs seem to have stagnated there more than 60 m.y\, and since modeled slab destabilization takes more than 100 m.y.\, lower-mantle entry is apparently usually triggered (e.g.\, by changes in plate buoyancy). Moreover\, in a few hundred degree hotter early Earth\, models predict slabs would have penetrated into the lower mantle more easily in the past\, when a weaker asthenosphere and decreased plate density and strength resulted in subduction almost without trench retreat. So heat and material transport in the Earth’s mantle might have been more (rather than less) efficient in the past. \n 
URL:https://lmv.uca.fr/agenda/seminaire-de-roberto-agrusta/
ATTACH;FMTTYPE=image/jpeg:https://lmv.uca.fr/wp-content/uploads/2018/01/portrait_mini.jpeg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20180313T140000
DTEND;TZID=Europe/Paris:20180313T160000
DTSTAMP:20260530T045137
CREATED:20180108T135613Z
LAST-MODIFIED:20180404T071416Z
UID:14407-1520949600-1520956800@lmv.uca.fr
SUMMARY:Séminaire de Frederic Moynier
DESCRIPTION:Le mardi 13 Mars à 14h dans l’amphi du LMV\, Frédéric Moynier (IPGParis) présentera ses travaux sur : \nTracing Earth’s late accretion with HSE stable isotopes \n 
URL:https://lmv.uca.fr/agenda/seminaire-de-frederic-moynier/
ATTACH;FMTTYPE=image/jpeg:https://lmv.uca.fr/wp-content/uploads/2018/01/300pxmoynier.jpg
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BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20180322T090000
DTEND;TZID=Europe/Paris:20180322T120000
DTSTAMP:20260530T045137
CREATED:20180228T133644Z
LAST-MODIFIED:20180228T133644Z
UID:15280-1521709200-1521720000@lmv.uca.fr
SUMMARY:Conseil de laboratoire
DESCRIPTION:
URL:https://lmv.uca.fr/agenda/conseil-de-laboratoire-3/
LOCATION:LMV Salle Chaine des Puys
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20180326T140000
DTEND;TZID=Europe/Paris:20180326T150000
DTSTAMP:20260530T045137
CREATED:20180216T124839Z
LAST-MODIFIED:20180216T124839Z
UID:14960-1522072800-1522076400@lmv.uca.fr
SUMMARY:VolcaPot: Alessandro Tadini
DESCRIPTION:VolcaPot du Lundi 26 Mars 2018 à 14h: Alessandro Tadini \nVent Opening Probability map and Pyroclastic Density Currents hazard assessment at Somma-Vesuvio through a multidisciplinary approach based on physical volcanology and numerical modeling \nSomma-Vesuvio (SV) is one of the most dangerous volcanoes in the world. Its surroundings are very densely inhabited with more than 600\,000 people living within 6 km of the present crater. Moreover\, SV eruptive styles are significantly variable\, ranging from relatively gentle lava effusions to devastating Plinian eruptions\, while the spatial variability in vent locations has been moderate but had significant effects on volcanic products dispersal area. Despite the fact that numerous field data have been collected and lots of studies have been done\, the problem of Pyroclastic Density Currents (PDCs) hazard assessment at SV has not been fully addressed\, and a PDC probabilistic invasion map is still lacking. \nThis presentation would like to provide an overview of my Ph.D. project\, which was focused on the following objectives: a) implementation of a database with the most significant volcanological data useful for the development of a vent opening probability map within the SV caldera; b) development of probability density maps for each volcanological dataset defined in a) and linear combination of such maps (each of them with appropriate weights assigned after an expert elicitation procedure) to obtain a first vent opening probability map with specific focus on explosive volcanism; c) field and laboratory studies of selected deposits of PDCs at SV for better characterizing Total-Grain Size Distributions\, invasion areas and total volumes of such PDCs; d) application and partial validation of simplified physical models and numerical simulation of PDC formation and propagation using the new parameters defined in c); e) volcanic hazard assessment at SV in the case of a future reactivation of the volcano through a preliminary PDC probabilistic invasion map.
URL:https://lmv.uca.fr/agenda/volcapot-alessandro-tadini/
CATEGORIES:VolcaPot
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20180327T140000
DTEND;TZID=Europe/Paris:20180327T160000
DTSTAMP:20260530T045137
CREATED:20180110T083811Z
LAST-MODIFIED:20180404T072335Z
UID:14453-1522159200-1522166400@lmv.uca.fr
SUMMARY:Séminaire de Vincent Thiéry
DESCRIPTION:Mardi 27 Mars à 14h dans la salle des séminaires\, Vincent Thiéry (IMT Lille-Douai) présentera ses travaux sur : \nLes terrils en combustion\, des volcans (presque) comme les autres \nsuivi de \nQuelques mots sur les microdiamants métamorphiques de la série du Chavanon (Massif Central français) \n  \nLes terrils\, parfois encore orthographiés terris\, sont intimement liés à l’extraction du charbon. Il s’agit de tas de roches\, stériles et de déchets variés. En France\, ils sont les vestiges localement classés d’un passé minier révolu\, mais dans certains pays (Russie…) ils sont toujours en cours d’édification. Toutefois\, il existe d’autres types de terrils (encore dénommés crassiers) correspondant à d’autres substances : résidus de distillation de schistes bitumineux\, résidus métallurgiques… \nLe phénomène de combustion des terrils\, se manifeste sous la forme d’une élévation importante de température au sein du terril (plus de 1000°C\, voire 1500°C). Il est dû à la dégradation de la matière organique\, l’oxydation de la pyrite ou voire des causes extérieures comme la foudre ou des incendies accidentels. Les transformations minéralogiques associées à l’élévation de température au coeur des terrils se déroulent pratiquement à pression ambiante (ou tout du moins négligeable par rapport à celles qui caractérisent les phénomènes géologique plus communs). On parle de pyrométamorphisme\, ou encore de pyrométamorphisme anthropogénique voire de métamorphisme de combustion. Outre la recristallisation des argilites\, grès… et autres roches associées au charbon\, les températures extrêmes (1000-1500°C) peuvent être à l’origine de la fusion partielle des roches contenues dans le terril\, donnant naissance à des « roches » similaires aux laves\, d’où leur dénomination de « paralava »\, voire de « parabasalte ». Des phénomènes de type fusion partielle\, ségrégation du liquide silicaté et cristallisation de restites ont été décrits en Pologne. En surface des terrils en combustion\, outre des températures pouvant être relativement élevées (60-80°C)\, des émanations gazeuses déposent diverses phases et minéraux dont certains sont très rares : soufre\, sélénium natif\, réalgar… Dans un contexte complètement différent \, cet exposé sera l’occasion de revenir sommairement sur la découverte récente de microdiamants métamorphiques dans l’unité parautochtone de la série du Chavanon\, rattachée à l’unité parautochtone de l’édifice de nappes du Massif Central. Cette découverte dans des terrains où un tel métamorphisme de ultra-haute pression n’était pas soupçonnée amène un certain nombre d’interrogations\, tant sur la nature du métamorphisme que sur le(s) modèle(s) permettant de l’expliquer. En effet\, la présence de tels marqueurs indique des pressions de l’ordre de 3 GPa\, correspondant à un enfouissement d’environ 100 km. \n 
URL:https://lmv.uca.fr/agenda/seminaire-de-vincent-thierry/
ATTACH;FMTTYPE=image/jpeg:https://lmv.uca.fr/wp-content/uploads/2018/01/Vincent_Thiery2.png.jpeg
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20180329T130000
DTEND;TZID=Europe/Paris:20180329T140000
DTSTAMP:20260530T045137
CREATED:20180319T143142Z
LAST-MODIFIED:20180319T143142Z
UID:15443-1522328400-1522332000@lmv.uca.fr
SUMMARY:Petro-Pot Muriel Laubier
DESCRIPTION:Linking the redox state of magmas to that of their mantle source
URL:https://lmv.uca.fr/agenda/petro-pot-muriel-laubier/
LOCATION:LMV Salle Chaine des Puys
CATEGORIES:Séminaire
ATTACH;FMTTYPE=image/jpeg:https://lmv.uca.fr/wp-content/uploads/2015/12/Muriel_siteweb.jpg
END:VEVENT
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