{"691888":{"#nid":"691888","#data":{"type":"event","title":"EAS Seminar Series - Dr. Michelle Muth","body":[{"value":"\u003Cp\u003EThe oxygen fugacity of magmas partially governs the chemical evolution, degassing behavior, and economic potential of volcanic systems. Fe XANES analyses of volcanic glass is among the most important\u0026nbsp;precise tools used to characterize magmatic oxygen fugacity. In recent years this technique has led to a number of exciting discoveries about how oxygen fugacity evolves during the life of a volcanic system. However, these discoveries are underlain by a cri5cal assump5on: that the valence state of iron\u003Cbr\u003Ein volcanic glass is the same as the valence state of iron in high-temperature silicate melt. In this talk, I test whether sulfur and iron exchange electrons during the rapid cooling of silicate melts, altering iron valence state from its high temperature value. As a natural test case, I study the glassy margins of two pillow basalts erupted on the sea-floor, and will describe S and Fe XANES analyses along transects from the rapidly quenched rim of the pillows down into the slowly-quenched crystal-rich interiors. I will\u003Cbr\u003Ediscuss the implications of these results both for prior work and for future studies.\u003C\/p\u003E\u003Cp\u003E*Refreshments: 12-12:30 PM, ES\u0026amp;T Atrium\u003C\/p\u003E","summary":"","format":"limited_html"}],"field_subtitle":"","field_summary":[{"value":"\u003Cp\u003EThe oxygen fugacity of magmas partially governs the chemical evolution, degassing behavior, and economic potential of volcanic systems. Fe XANES analyses of volcanic glass is among the most important\u0026nbsp;precise tools used to characterize magmatic oxygen fugacity. In recent years this technique has led to a number of exciting discoveries about how oxygen fugacity evolves during the life of a volcanic system. However, these discoveries are underlain by a cri5cal assump5on: that the valence state of iron\u003Cbr\u003Ein volcanic glass is the same as the valence state of iron in high-temperature silicate melt. In this talk, I test whether sulfur and iron exchange electrons during the rapid cooling of silicate melts, altering iron valence state from its high temperature value. As a natural test case, I study the glassy margins of two pillow basalts erupted on the sea-floor, and will describe S and Fe XANES analyses along transects from the rapidly quenched rim of the pillows down into the slowly-quenched crystal-rich interiors. I will\u003Cbr\u003Ediscuss the implications of these results both for prior work and for future studies.\u003C\/p\u003E\u003Cp\u003E*Refreshments: 12-12:30 PM, ES\u0026amp;T Atrium\u003C\/p\u003E","format":"limited_html"}],"field_summary_sentence":[{"value":"Tracking sulfur and iron electron exchange in silicate melts: implica5ons for Earth\u2019s volcanism"}],"uid":"36678","created_gmt":"2026-08-24 13:46:37","changed_gmt":"2026-08-24 14:05:30","author":"tbuchanan9","boilerplate_text":"","field_publication":"","field_article_url":"","field_event_time":{"event_time_start":"2026-09-03T11:00:00-04:00","event_time_end":"2026-09-03T12:00:00-04:00","event_time_end_last":"2026-09-03T12:00:00-04:00","gmt_time_start":"2026-09-03 15:00:00","gmt_time_end":"2026-09-03 16:00:00","gmt_time_end_last":"2026-09-03 16:00:00","rrule":null,"timezone":"America\/New_York"},"location":"EST L1205","extras":["free_food"],"hg_media":{"680958":{"id":"680958","type":"image","title":"Muth Headshot","body":null,"created":"1787580302","gmt_created":"2026-08-24 14:05:02","changed":"1787580302","gmt_changed":"2026-08-24 14:05:02","alt":"Muth Headshot","file":{"fid":"265296","name":"Muth-Headshot.png","image_path":"\/sites\/default\/files\/2026\/08\/24\/Muth-Headshot.png","image_full_path":"http:\/\/hg.gatech.edu\/\/sites\/default\/files\/2026\/08\/24\/Muth-Headshot.png","mime":"image\/png","size":906568,"path_740":"http:\/\/hg.gatech.edu\/sites\/default\/files\/styles\/740xx_scale\/public\/2026\/08\/24\/Muth-Headshot.png?itok=5XgZMujJ"}}},"media_ids":["680958"],"related_links":[{"url":"https:\/\/michellemuth.github.io\/index.html","title":"Profile - Muth"}],"groups":[{"id":"364801","name":"School of Earth and Atmospheric Sciences (EAS)"}],"categories":[],"keywords":[{"id":"175623","name":"EAS Seminar"}],"core_research_areas":[],"news_room_topics":[],"event_categories":[],"invited_audience":[],"affiliations":[],"classification":[],"areas_of_expertise":[],"news_and_recent_appearances":[],"phone":[],"contact":[],"email":[],"slides":[],"orientation":[],"userdata":""}}}