BEGIN:VCALENDAR VERSION:2.0 PRODID:-//ISTO Institut des Sciences de la Terre d'Orléans - ECPv4.6.1//NONSGML v1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH X-WR-CALNAME:ISTO Institut des Sciences de la Terre d'Orléans X-ORIGINAL-URL:https://www.isto-orleans.fr X-WR-CALDESC:Events for ISTO Institut des Sciences de la Terre d'Orléans BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20260428T133000 DTEND;TZID=Europe/Paris:20260428T143000 DTSTAMP:20260507T012428 CREATED:20260420T061611Z LAST-MODIFIED:20260420T061838Z UID:28430-1777383000-1777386600@www.isto-orleans.fr SUMMARY:Seminar Johnny ZhangZhou DESCRIPTION: \nMachine Learning for Earth’s Redox: From Minerals to Proteins\nTuesday\, April 28\n13:30\nE001\n  \n\nVisio \nIn this talk\, I will present three related themes. First\, I will discuss when AI can lead to scientific discovery and when it is likely to be misleading\, with an emphasis on the complementary relationship between machine learning and thermodynamics. Second\, I will present a petrological case study on sub‑arc mantle oxygen fugacity\, using machine learning to distinguish arc from non‑arc samples and to extend this framework to older samples with less certain tectonic settings. Third\, I will introduce recent work on structural similarities between minerals and protein active sites using AlphaFold‑derived structures\, and discuss possible temporal parallels between mineral evolution and the emergence of biological metal‑binding sites\, particularly around major transitions such as the last universal common ancestor and the Great Oxidation Event. \n URL:https://www.isto-orleans.fr/2026/04/20/seminar-johnny-zhangzhou-2/ ATTACH;FMTTYPE=image/jpeg:https://www.isto-orleans.fr/wp-content/uploads/2026/04/ZhangZhou-J-Image-scaled.jpg END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20260430T140000 DTEND;TZID=Europe/Paris:20260430T150000 DTSTAMP:20260507T012428 CREATED:20260423T150228Z LAST-MODIFIED:20260423T150424Z UID:28470-1777557600-1777561200@www.isto-orleans.fr SUMMARY:Seminar Sanjana Kamath DESCRIPTION: \nCooperative unclogging of hydrogel particles in porous media\n\n Thur\, April 30\n \n\n 14:00\n \n\n E001\n \n \n \n\n \n Visio \n \nWe use event-driven pore network modeling to study the transport of dense suspensions of hydrogel particles through porous mediau--a process that underlies diverse applications\, from geothermal energy to drug delivery. In the dilute regime\, our simulations uncovered a surprising cooperative effect: adding more particles enables them to penetrate deeper into the medium. This phenomenon arises because individual particles redirect fluid to adjacent throats\, forcing nearby particles through tight pores that they would otherwise clog. Moving from the dilute to dense regime\, we hypothesized that the local concentration of particles must play a key role in dictating suspension transport. Indeed\, we observe that an increase in the local concentration leads to an increase in the velocity of mobile gels and unclogging probability as well as a decrease in clogging probability. \n URL:https://www.isto-orleans.fr/2026/04/23/seminar-sanjana-kamath-2/ ATTACH;FMTTYPE=image/jpeg:https://www.isto-orleans.fr/wp-content/uploads/2026/04/San-pic.jpg END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20260505T133000 DTEND;TZID=Europe/Paris:20260505T143000 DTSTAMP:20260507T012428 CREATED:20260428T083942Z LAST-MODIFIED:20260428T084738Z UID:28500-1777987800-1777991400@www.isto-orleans.fr SUMMARY:Seminar Patrick Ledru DESCRIPTION: \nRôle des événements transitoires dans la stimulation de la perméabilité des socles : le cas d'étude des gisements d'uranium de discordance de l'Athabasca (Canada)\nTuesday\, May 5\n13:30\nE001\n  \n\nVisio \nLes gisements d'uranium localisés à la discordance entre le socle orogénique Trans-Hudsonien (1.8 Ga) du Craton de Hearne et le bassin Paleo à Mésoprotérozoïque de l'Athabasca (Saskatchewan\, Canada) témoignent d'une circulation de saumures de bassin exceptionnelle en volume et en teneur métallique\, le long de la discordance et dans les structures du socle et leur extension dans le bassin. La nature transitoire ou progressive de la mise en place des minéralisations est une question scientifique de premier ordre qui a des implications majeures en termes de stratégie d'exploration de nouveaux gisements. Cette question est abordée dans une approche systémique\, en rapport avec le concept de fenêtre critique de coïncidence de plusieurs paramètres géologiques favorable à l'accumulation d'éléments métalliques. \nLes empreintes des événements transitoires sont recherchées à différentes échelles par les méthodes d'analyse géologique et pétrophysique à partir des coupes et modèles géologiques et des carottes de forage. L'une des empreintes majeure est la coïncidence entre la réactivation des structures du socle\, principalement lors d'un rejeu en faille inverse qui affecte la discordance et qui se traduit par une propagation des failles dans le bassin\, et la circulation des fluides. La modélisation numérique permet d'autre part de contraindre les conditions aux limites de formation de gisements d'échelle économique. \nLes systèmes géothermiques améliorés offrent un retour d'expérience exceptionnel sur la circulation des fluides et la stimulation de la perméabilité des structures de socle et de bassin. L'application de cette connaissance à la formation des gisements de discordance fournit des clés de compréhension de l'évolution de ce système métallogénique et ouvre de nouveaux sujets de recherche. \n URL:https://www.isto-orleans.fr/2026/04/28/seminar-patrick-ledru/ ATTACH;FMTTYPE=image/jpeg:https://www.isto-orleans.fr/wp-content/uploads/2026/04/Picture1.jpg END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Paris:20260512T133000 DTEND;TZID=Europe/Paris:20260512T143000 DTSTAMP:20260507T012428 CREATED:20260504T112111Z LAST-MODIFIED:20260504T112155Z UID:28582-1778592600-1778596200@www.isto-orleans.fr SUMMARY:Seminar Giada Iacono-Marziano DESCRIPTION: \nThe Mineral System of magmatic Ni-Cu-PGE sulfide deposits revisited by an experimental petrologist\nTuesday\, May 12\n13:30\nE001\n  \n\nVisio \nThe mineral system approach interprets the formation of ore deposits in terms of source\, pathway\, and sink processes\, with the aim of improving ore exploration. Magmatic Ni–Cu–PGE sulfide deposits form by the segregation and accumulation of immiscible sulfide melts from mafic or ultramafic magmas. The mineral system approach for these deposits mainly investigates (i) the geodynamic setting\, (ii) sources and compositions of ore-forming magmas\, (iii) the magma migration pathway at crustal scale\, (iv) magma focusing and emplacement mechanisms at deposit scale\, (v) chemical and physical mechanisms for ore precipitation. Here we discuss these points using recent experimental studies that shed light on previously neglected processes\, using the Noril'sk-Talnakh province in Russia and the Central Lapland Greenstone Belt in Finland as case studies. The implications of the experimental works are also presented in terms of ore exploration at the province\, camp and deposit scales. \n URL:https://www.isto-orleans.fr/2026/05/04/seminar-giada-iacono-marziano-2/ ATTACH;FMTTYPE=image/webp:https://www.isto-orleans.fr/wp-content/uploads/2026/05/giada_jpeg.webp END:VEVENT END:VCALENDAR