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DTSTAMP:20260206T131439
DTSTART;TZID=America/Detroit:20260225T100000
DTEND;TZID=America/Detroit:20260225T110000
SUMMARY:Fair / Festival:LSA@Play: Mystery Book Match
DESCRIPTION:Take a chance and discover your next great read! Choose a wrapped book from a wide variety of genres\, each labeled with just four words/phrases as your only hint. Select a book\, unwrap your surprise\, and enjoy. It’s yours to keep. \n\nBooks will be restocked daily and are available while supplies last.\n\nIn partnership with LSA Student Government.\n__________\nFor LSA undergrads only. Join us for LSA@Play\, a vibrant series of events designed to welcome and support LSA students! Gatherings and activities offer an opportunity for students to prioritize well-being\, inclusivity\, and community. Plus\, get free food and LSA swag! Visit the LSA@Play webpage: lsa.umich.edu/play for more details\, subscribe to receive text/email updates\, and check for additional events being added soon! Events are first-come\, first-served\, and while supplies last. One swag item per student\, and you must be present with an MCard to receive it.\n\nThe University of Michigan College of Literature\, Science\, and the Arts (LSA) greatly values inclusion and access for all. We are pleased to provide reasonable accommodations to enable your full participation in this event. Please email lsaatplay@umich.edu if you would like to request disability accommodations or have any questions or concerns. We ask that you provide advance notice to ensure sufficient time to meet the requested accommodations.
UID:145175-21896764@events.umich.edu
URL:https://events.umich.edu/event/145175
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Free,Literature,Undergraduate Students,Well-being
LOCATION:LSA Building - 1040 Multipurpose Room
CONTACT:
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DTSTAMP:20260209T131526
DTSTART;TZID=America/Detroit:20260225T100000
DTEND;TZID=America/Detroit:20260225T110000
SUMMARY:Lecture / Discussion:Yiruo Xu Dissertation Defense
DESCRIPTION:Understanding Earth’s tectonic processes is contingent on constraining their rates and durations. The timescale of metamorphism (i.e.\, for how long a rock is subjected to high pressure and temperature) is indicative of how heat and mass transfer during a tectonic event. During metamorphism\, compositional gradients form in minerals and are modified by chemical diffusion. Forward modeling of the extent of diffusion quantifies the time involved in the production and preservation of these gradients\, and thus proves to be a powerful tool for constraining metamorphic timescales (“diffusion chronometry”). However\, tectonic settings of different types and ages have not been evenly targeted for rigorous diffusion studies.\nThis thesis applies diffusion chronometry in garnet to various terranes and demonstrates its potential in addressing critical questions about Earth’s tectonics.\n\nThe first chapter reviews the significance of timescale constraints in the study of tectonics and introduces the fundamental principles of chemical diffusion in garnet. Chapters 2 and 3 evaluate the secular change of global metamorphic cooling rates over Earth’s history using two case studies of an Archean craton\, the Superior Province of North America. The Minnesota River Valley Subprovince is characterized by two neighboring crustal blocks that were metamorphosed contemporaneously to different grades by an advective heating event. They record strikingly different cooling rates that suggest greater complexities in the cooling histories of Precambrian orogens than commonly assumed. A comprehensive study of the Quetico\nSubprovince that contrasts diffusion chronometry with radiometric dating (“thermochronology”) further demonstrates the uncertainty and variability of Archean metamorphic cooling rates. The suggestion that the apparent increase in cooling rates globally\, since the Archean eon\, reflects fundamental tectonic changes should be evaluated with caution\, given the inherent limitations and biases of existing data. Chapter 4 presents the first application of\ndiffusion chronometry to constrain the timescales of material cycling deep in a subduction zone using complexly zoned garnet crystals from Jurassic subduction m´elanges of Cedros Island\, Baja California\, Mexico. The pressure–temperature–time evolution of the subducted blocks cannot be explained by large-scale distributed flow in the subduction channel\, as proposed in some numerical models. Instead\, the subducted materials experienced more complex circulation and rapid exhumation via focused return flow.
UID:145267-21896962@events.umich.edu
URL:https://events.umich.edu/event/145267
CLASS:PUBLIC
STATUS:CONFIRMED
CATEGORIES:Earth And Environmental Sciences
LOCATION:1100 North University Building - 2540
CONTACT:
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