BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Laboratoire Chrono-environnement - ECPv6.15.17.1//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Laboratoire Chrono-environnement
X-ORIGINAL-URL:https://chrono-environnement.univ-fcomte.fr
X-WR-CALDESC:Évènements pour Laboratoire Chrono-environnement
REFRESH-INTERVAL;VALUE=DURATION:PT1H
X-Robots-Tag:noindex
X-PUBLISHED-TTL:PT1H
BEGIN:VTIMEZONE
TZID:Europe/Paris
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20240331T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20241027T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20250330T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20251026T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20260329T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20261025T010000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20251218T140000
DTEND;TZID=Europe/Paris:20251218T170000
DTSTAMP:20260405T070644
CREATED:20251202T104705Z
LAST-MODIFIED:20260108T154518Z
UID:24085-1766066400-1766077200@chrono-environnement.univ-fcomte.fr
SUMMARY:Soutenance de thèse d'Alban Cheviet
DESCRIPTION:Alban Cheviet a le plaisir de vous inviter à sa soutenance de thèse intitulée Impact of magmatic activity and magma-sediment-fluid interactions on the transfer and sequestration of volatiles\, réalisée sous la direction de Martine Buatier\, Wolfgang Bach\, Flavien Choulet et Christophe Galerne\, en cotutelle entre l’Université Marie et Louis Pasteur et l’Université de Brême. \nLa soutenance aura lieu le jeudi 18 décembre 2025 à 14h\, dans l’amphithéâtre B\, bâtiment Métrologie\, situé au 16 route de Gray à Besançon. Il sera également possible d’assister à la soutenance en visioconférence sous réserve d’un contact préalable à l’adresse suivante : alban.cheviet@univ-fcomte.fr \nComposition du jury\n \nChavagnac Valérie\, Directrice de recherche CNRS\, GET Univ. Toulouse\, Rapportrice\nDebret Baptiste\, Chargé de recherche CNRS\, IPGP Univ. Paris Cité\, Rapporteur\nIacono-Marziano Giada\, Chargée de recherche ISTO Univ. Orléans\, Examinatrice\nChazot Gilles\, Professeur\, Univ. Bretagne Occidentale\, Examinateur\nBuatier Martine\, Professeure\, Chrono-environnement UMLP\, Directrice de thèse\nBach Wolfgang\, Professeur\, Marum Univ. Brême\, Codirecteur de thèse\nChoulet Flavien\, Maître de conférences\, Chrono-environnement UMLP\, Co-encadrant\nGalerne Christophe\, Chercheur\, Marum Univ. Brême\, Co-encadrant \nRésumé \nVolcanic basins play a central role in the exchange of volatiles between the lithosphere\, hydrosphere\, atmosphere and biosphere. The intrusion of magmas into sedimentary basins induces complex interactions between magma\, sediments and fluids\, profoundly modifying the biogeochemical cycles of carbon and sulphur. These phenomena are known to have contributed to major climatic and biological crises throughout Earth’s history\, but the mechanisms by which volatiles are partially trapped are still poorly understood.\nThis thesis studies the magma-sediment-fluid interaction processes and their consequences for the mobilisation and sequestration of carbon and sulphur in the Guaymas Basin (Gulf of California)\, a young system where basaltic sills were emplaced in unconsolidated sediments rich in organic matter and pore water. Three levels of interaction have been identified: (1) contact metamorphism\, which causes dehydration and decarbonation of the sediments. (2) magmatic contamination\, where hydration of the magma by metamorphic fluids and contamination by fluids from the sediments disrupt magma crystallisation (3) late hydrothermal circulation.\nTaken together\, these processes allow several hundred thousand tonnes of sulphur and large quantities of carbon to be stored locally. On a basin-wide scale\, these interactions make the sills veritable volatile traps\, modifying the global balance of greenhouse gases emitted during magmatic intrusions.\nThis study shows that\, contrary to the classic paradigm of complete degassing into the atmosphere\, a significant proportion of volatiles can be sequestered in magmatic and metamorphic rocks over the long term. \n 
URL:https://chrono-environnement.univ-fcomte.fr/agenda/soutenance-de-these-dalban-cheviet/
LOCATION:Amphi B\, 16 Route de Gray\, Besançon\, 25000\, France
CATEGORIES:Soutenance
ATTACH;FMTTYPE=image/jpeg:https://chrono-environnement.univ-fcomte.fr/wp-content/uploads/2025/12/gabarit_Soutenance_Cheviet_1008-400.jpg
END:VEVENT
END:VCALENDAR