BEGIN:VCALENDAR VERSION:2.0 METHOD:PUBLISH PRODID:-//Missouri State University/Calendar of Events//EN CALSCALE:GREGORIAN X-WR-TIMEZONE:America/Chicago BEGIN:VTIMEZONE TZID:America/Chicago BEGIN:DAYLIGHT TZOFFSETFROM:-0600 TZOFFSETTO:-0500 DTSTART:20070311T020000 RRULE:FREQ=YEARLY;BYMONTH=3;BYDAY=2SU TZNAME:CDT END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:-0500 TZOFFSETTO:-0600 DTSTART:20071104T020000 RRULE:FREQ=YEARLY;BYMONTH=11;BYDAY=1SU TZNAME:CST END:STANDARD END:VTIMEZONE BEGIN:VEVENT UID:91eab9a5-523f-48ce-b0da-3d80beb4f30f.227964@calendar.missouristate.edu CREATED:20230424T195012Z LAST-MODIFIED:20230424T195012Z LOCATION:Roy Blunt Hall 345 SUMMARY:GGP Seminar: Micah Mayle - "Potential lithosphere and asthenospher e melt sources of early syn-rift magmatism: Insights from 1D geodynamic m odels" DESCRIPTION:Micah Mayle is currently a PhD candidate at Colorado State Uni versity. He is an alumnus of Missouri State University - Geology\, BS\, 2 014.\n\n\nThis presentation will talk about geochemical and isotopic sign atures of magmatism from many continental rifts such as the East African Rift System\, the Rio Grand Rift\, and West Antarctic Rift System. All su ggest that potential sources of syn-rift magmatism vary with time. The ea rliest magmas erupted during nascent rifting and are likely produced by t he melting of fertile lithologies in the lithosphere or asthenosphere. La ter magmatism\, occurring in mature rifts\, are the result of less fertil e asthenosphere-derived melts. Potential fertile sources in the mantle (p yroxenite-\, eclogite-\, and amphibole-bearing source rocks\, as well as wet Iherzolite) responsible for the geochemical signatures\, have been pr oposed to result from previous metasomatization\, magmatism\, or subducti on.\n\n\nWe test the viability of a multi-lithology model consisting of f ertile sources (pyroxenite\, eclogite\, or wet Iherzolite) in the ambient mantle (dry Ihersolite) using a new 1D (one-dimensional) geodynamic mode l. This model can be run with or without latent heat of melting and calcu lates the pressure-temperature conditions for an extending lithosphere an d vertically ascending underlying asthenosphere through time. Results sho w that if a multi-lithology mantel is rifted\, there will be a distinct p attern of magmatism. Latent heat absorbed during early syn-rift melting o f the most fusible lithologies may reduce the temperature in the upper ma ntle sufficiently to inhibit a later melting of less fertile components t hat might be present. Thus\, early syn-rift magmatism may delay\, inhibit \, or prevent later syn-rift melt production from fertile components in t he mantle. Rift models that do not consider the latent heat of melting ov erestimate mantle temperatures and thus melt. They also underestimate the amount of extension required before melting begins and before peak melt production rates are achieved. \n\n\nMicah obtained his master's degree i n geophysics from Oklahoma State University in 2018. His current research utilizes 1D and 2D geodynamic models to better understand the sources an d effects of syn-rift magmatism. Micah enjoys hiking and exploring Colora do in his spare time. X-ALT-DESC;FMTTYPE=text/html:<html><head><title></title></head><body><p>Mi cah Mayle is currently a PhD candidate at Colorado State University. He i s an alumnus of Missouri State University - Geology\, BS\, 2014.</p>\n<p> This presentation will talk about geochemical and isotopic signatures of magmatism from many continental rifts such as the East African Rift Syste m\, the Rio Grand Rift\, and West Antarctic Rift System. All suggest that potential sources of syn-rift magmatism vary with time. The earliest mag mas erupted during nascent rifting and are likely produced by the melting of fertile lithologies in the lithosphere or asthenosphere. Later magmat ism\, occurring in mature rifts\, are the result of less fertile asthenos phere-derived melts. Potential fertile sources in the mantle (pyroxenite- \, eclogite-\, and amphibole-bearing source rocks\, as well as wet Iherzo lite) responsible for the geochemical signatures\, have been proposed to result from previous metasomatization\, magmatism\, or subduction.</p>\n< p>We test the viability of a multi-lithology model consisting of fertile sources (pyroxenite\, eclogite\, or wet Iherzolite) in the ambient mantle (dry Ihersolite) using a new 1D (one-dimensional) geodynamic model. This model can be run with or without latent heat of melting and calculates t he pressure-temperature conditions for an extending lithosphere and verti cally ascending underlying asthenosphere through time. Results show that if a multi-lithology mantel is rifted\, there will be a distinct pattern of magmatism. Latent heat absorbed during early syn-rift melting of the m ost fusible lithologies may reduce the temperature in the upper mantle su fficiently to inhibit a later melting of less fertile components that mig ht be present. Thus\, early syn-rift magmatism may delay\, inhibit\, or p revent later syn-rift melt production from fertile components in the mant le. Rift models that do not consider the latent heat of melting overestim ate mantle temperatures and thus melt. They also underestimate the amount of extension required before melting begins and before peak melt product ion rates are achieved.&nbsp\;</p>\n<p>Micah obtained his master's degree in geophysics from Oklahoma State University in 2018. His current resear ch utilizes 1D and 2D geodynamic models to better understand the sources and effects of syn-rift magmatism. Micah enjoys hiking and exploring Colo rado in his spare time.</p></body></html> DTSTART;TZID=America/Chicago:20230428T153000 DTEND;TZID=America/Chicago:20230428T163000 SEQUENCE:1 URL:http://www.geosciences.MissouriState.edu CATEGORIES:Public,Alumni,Current Students,Faculty,Future Students END:VEVENT END:VCALENDAR