BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//Laboratoire Magmas et Volcans - ECPv6.15.20//NONSGML v1.0//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
X-WR-CALNAME:Laboratoire Magmas et Volcans
X-ORIGINAL-URL:https://lmv.uca.fr
X-WR-CALDESC:Évènements pour Laboratoire Magmas et Volcans
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:20170326T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20171029T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20180325T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20181028T010000
END:STANDARD
BEGIN:DAYLIGHT
TZOFFSETFROM:+0100
TZOFFSETTO:+0200
TZNAME:CEST
DTSTART:20190331T010000
END:DAYLIGHT
BEGIN:STANDARD
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
TZNAME:CET
DTSTART:20191027T010000
END:STANDARD
END:VTIMEZONE
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20181016T140000
DTEND;TZID=Europe/Paris:20181016T170000
DTSTAMP:20260505T203435
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
END:VEVENT
END:VCALENDAR