{ "138242-21882661": { "datetime_modified":"20250827T105843", "datetime_start":"20250905T153000", "datetime_end":"20250905T163000", "has_end_time":1, "date_start":"2025-09-05", "date_end":"2025-09-05", "time_start":"15:30:00", "time_end":"16:30:00", "time_zone":"America\/Detroit", "event_title":"Smith Lecture: Junjie Dong", "occurrence_title":"", "combined_title":"Smith Lecture: Junjie Dong: Storage and Distribution of Water in Earth\u2019s Mantle", "event_subtitle":"Storage and Distribution of Water in Earth\u2019s Mantle", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"Water is fundamental to the Earth\u2019s surface environment. Volcanic outgassing and subduction recycling connect the deep interior with the atmosphere and oceans, shaping the planet\u2019s long-term habitability. Surface oceans and mantle water are not separate reservoirs; they are inherently linked to the planet\u2019s thermal and redox evolution.\r\n\r\nIn this talk, I will trace the storage and distribution of water in the mantle. Our earlier work showed that the capacity of the mantle to hold water depends strongly on temperature. A hotter Archean mantle could have held less water than the mantle actually contains today, suggesting that Earth's early surface might have been covered by larger oceans. The interplay between mantle cooling, water cycling, and sea-level stability highlights the importance of the mantle as a dynamic water reservoir. More recently, we examined how the disproportionation of iron in silicate minerals further regulates mantle water distribution. As the mantle becomes increasingly reduced with depth, metallic iron stabilizes and reacts with structural water in nominally anhydrous minerals, producing reduced hydrogen species such as molten FeHx or fluid H\u2082. This water\u2013iron reaction prevents hydration of mantle silicates and drives hydrogen into metal-rich reservoirs, thereby altering the form and location of water in the mantle.\r\n\r\nTogether, this research provides a framework for understanding how much water the mantle can store and where it resides. The results suggest that the coevolution of water with Earth\u2019s thermal and redox states governs its deep storage, distribution, and cycling, and, by extension, ocean volume, atmospheric composition, and the long-term redox evolution of the planet.", "occurrence_notes":null, "guid":"138242-21882661@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/138242", "building_id":"1000188", "building_name":"1100 North University Building", "campus_maps_id":"628", "room":"2540", "location_name":"1100 North University Building", "has_livestream":0, "cost":"", "tags":["Earth And Environmental Sciences"], "website":"", "sponsors":[ { "group_name":"Earth and Environmental Sciences", "group_id":"3170", "website":"http:\/\/www.lsa.umich.edu\/earth" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2025\/08\/event_138242_original-1.jpg", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2025\/08\/event_138242_original-1.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2025\/08\/event_138242_original-1.jpg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2025\/08\/event_138242_original-1.jpg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2025\/08\/event_138242_original-1.jpg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2025\/08\/event_138242_original-1.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2025\/08\/event_138242_original-1.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2025\/08\/event_138242_original-1.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2025\/08\/event_138242_original-1.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2025\/08\/event_138242_original-1.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2025\/08\/event_138242_original-1.jpg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2025\/08\/event_138242_original-1.jpg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2025\/08\/event_138242_original-1.jpg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2025\/08\/event_138242_original-1.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2025\/08\/event_138242_original-1.jpg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2025\/08\/event_138242_original-1.jpg" }, "occurrence_count":1, "first_occurrence":21882661 } , "136751-21879081": { "datetime_modified":"20250729T095456", "datetime_start":"20250905T160000", "datetime_end":"20250905T170000", "has_end_time":1, "date_start":"2025-09-05", "date_end":"2025-09-05", "time_start":"16:00:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"NERS Colloquium", "occurrence_title":"", "combined_title":"NERS Colloquium: Speaker: Jhansi Kandasamy, The Nuclear Company", "event_subtitle":"Speaker: Jhansi Kandasamy, The Nuclear Company", "event_type":"Workshop \/ Seminar", "event_type_id":"21", "description":"The NERS Colloquium Series invites leading researchers, industry experts, and thought leaders from across the nuclear engineering and radiological sciences community to share their insights with students, faculty, and guests. Covering a wide range of topics\u2014from cutting-edge research and emerging technologies to policy, education, and professional development\u2014the weekly talks offer an opportunity to explore current issues and innovations shaping the future of the field.", "occurrence_notes":null, "guid":"136751-21879081@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/136751", "building_id":"1000429", "building_name":"Industrial and Operations Engineering Building", "campus_maps_id":"73", "room":"IOE 1610", "location_name":"Industrial and Operations Engineering Building", "has_livestream":0, "cost":"", "tags":["Career","Energy","Industry Session","Michigan Engineering","Nuclear Engineering and Radiological Sciences"], "website":"https:\/\/ners.engin.umich.edu\/events\/", "sponsors":[ { "group_name":"Nuclear Engineering & Radiological Sciences", "group_id":"4000", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2025\/07\/event_136751_original-1.jpg", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2025\/07\/event_136751_original-1.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2025\/07\/event_136751_original-1.jpg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2025\/07\/event_136751_original-1.jpg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2025\/07\/event_136751_original-1.jpg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2025\/07\/event_136751_original-1.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2025\/07\/event_136751_original-1.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2025\/07\/event_136751_original-1.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2025\/07\/event_136751_original-1.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2025\/07\/event_136751_original-1.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2025\/07\/event_136751_original-1.jpg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2025\/07\/event_136751_original-1.jpg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2025\/07\/event_136751_original-1.jpg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2025\/07\/event_136751_original-1.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2025\/07\/event_136751_original-1.jpg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2025\/07\/event_136751_original-1.jpg" }, "occurrence_count":1, "first_occurrence":21879081 } }