{ "145247-21896925": { "datetime_modified":"20260209T111822", "datetime_start":"20260213T153000", "datetime_end":"20260213T163000", "has_end_time":1, "date_start":"2026-02-13", "date_end":"2026-02-13", "time_start":"15:30:00", "time_end":"16:30:00", "time_zone":"America\/Detroit", "event_title":"Smith Lecture: Mini-Talks", "occurrence_title":"", "combined_title":"Smith Lecture: Mini-Talks: Adriana Brown, Rory Sweedler, and Mack Taylor", "event_subtitle":"Adriana Brown, Rory Sweedler, and Mack Taylor", "event_type":"Lecture \/ Discussion", "event_type_id":"13", "description":"The Department of Earth and Environmental Sciences will hear three mini-talks from current graduate students.\n\nAdriana Brown: The evolution of seawater temperature and oxygen isotopes in the Cretaceous Western Interior Seaway using carbonate clumped isotopes\n\nThe Western Interior Seaway (WIS) was a vast epicontinental sea that inundated North America in a series of transgressive-regressive marine cycles from the Early to Late Cretaceous. The WIS has been studied as a classic shallow Cretaceous seaway with a complex stratigraphic record of the interplay between tectonics, climate, sea level, basin evolution, and faunal evolution. However, fundamental questions remain unresolved regarding the WIS, including how seawater temperatures and oxygen isotope compositions (\u03b418Ow) varied latitudinally and through time. A robust record of reconstructed temperature and water isotopes could help explain paleoceanographic and environmental conditions in the WIS, but this has traditionally been challenging due to limited sample coverage and poor constraints on \u03b418Ow. Here, we use carbonate clumped isotopes (\ud835\udeab47) measurements of 119 well-preserved oysters to reconstruct temperature and \u03b418Ow from the Albian to Maastrichtian between 25 to 57 \u00b0N. This dataset approximately triples the amount of \ud835\udeab47 WIS temperature and \u03b418Ow values published to date. From this, we find that in each time period the seaway remained consistently warm through all U.S. latitudes and may have been influenced by freshwater runoff from emerging highlands. Canadian temperatures indicate a cooler and potentially less saline water source entering the seaway from the North. We relate these changes in temperature and isotopic composition to global and regional sea level fluctuations, tectonic regimes, and paleocirculation dynamics.\n\n--\n\nRory Sweedler: Topographic diversity gradients revealed among latest Cretaceous multituberculate mammals\n\nToday, mountainous regions are hotspots of mammalian biodiversity, forming patterns known as topographic diversity gradients; however, interactions between mountain uplift and mammalian biodiversity in deep time are poorly understood. I compare the taxonomic diversity of a group of mammals, multituberculates, from two sites from the latest Cretaceous of Wyoming during the uplift of the North American Cordillera. Higher species richness of multituberculates at the mountain-proximal site compared to the mountain-distal site, nearly 400 km to the east, is interpreted as evidence of a topographic diversity gradient. Similarities in faunal composition between mountain-proximal sites across the latest Cretaceous Western Interior of North America suggest tectonic processes as important drivers of mammalian biodiversity and community composition in the past and present.\n\n-- \n\nMack Taylor: The Failed Supervolcano Spirit Mountain (Avi Kwa Ame) and The Critical Role of Basalt and Pre-existing Aplite Dikes in Producing Eruptible High-SiO 2 Rhyolite\n\nHigh-SiO2 (\u226576 wt%) rhyolite (HSR) is the most differentiated magma on Earth. Generally restricted to thin (<20 cm) aplite dikes within arc granitoids, voluminous accumulations of HSR in plutonic rocks are rare at subduction zones but do occur in regions of continental extension. Among the few examples known is the Miocene bimodal (granite-diorite) Spirit Mountain pluton of the Colorado River Extensional Corridor, NV. Evidence from the literature shows the ~6 km thick (x ~25 km) pluton assembled incrementally via sheets of low-SiO2 rhyolite over a 2 m.y. interval. It features a ~1.5 km thick leucogranite cap (76-78 wt% SiO2) that zones down through \u22654.5 km of coarse granite into a quartz monzonite, which contains abundant mafic enclaves. Within the coarse granite, discrete silicic segregations and aplite dikes are found with a HSR composition, like the leucogranite cap. However, there are distinct compositional differences, including a relative depletion of middle rare earth elements, reflecting the presence of titanite during melt segregation. This horseshoe REE pattern is not seen in the leucogranite cap, which instead features a seagull pattern, indicating that titanite melted out when it formed. Previous studies have emphasized the role of compaction in a crystal-rich mush to drive segregation of interstitial melts, producing the leucogranite cap and quartz monzonite (cumulate) base. In this study, we test a modification of this model and examine whether the HSR leucogranite cap formed by episodic partial melting of the granitic base, driven by the influx of hot, H2O-rich fluids from deeper, degassed basaltic intrusions. We further explore the role of pre-existing aplite dikes during partial melting of the granitoid host. These eutectic HSR aplite dikes would have melted completely when the host granitoid was only partially molten (with titanite melted out). The initial ascent of the aplite dikes would have drawn voluminous partial melt out of the host granite. We show that resulting molten high-SiO2 rhyolite dikes \u22650.5 m width (exceeding critical widths) could have ascended through several km of sub-solidus granite at \u2265 600\u00b0C. Presumably, if an influx of basalt had intruded beneath the leucogranite cap, releasing hot fluid, it could have induced its rapid melting and thus eruption of HSR with a seagull REE pattern.", "occurrence_notes":null, "guid":"145247-21896925@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/145247", "building_id":"1000188", "building_name":"1100 North University Building", "campus_maps_id":"628", "room":"1528", "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\/2026\/02\/event_145247_original-1.jpg", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/02\/event_145247_original-1.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/02\/event_145247_original-1.jpg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/02\/event_145247_original-1.jpg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/02\/event_145247_original-1.jpg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb\/media\/attachments\/2026\/02\/event_145247_original-1.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_thumb_square\/media\/attachments\/2026\/02\/event_145247_original-1.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large\/media\/attachments\/2026\/02\/event_145247_original-1.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/resolve\/group_large_lightbox\/media\/attachments\/2026\/02\/event_145247_original-1.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_large_crop\/media\/attachments\/2026\/02\/event_145247_original-1.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_list\/media\/attachments\/2026\/02\/event_145247_original-1.jpg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/02\/event_145247_original-1.jpg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/02\/event_145247_original-1.jpg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_grid_2x\/media\/attachments\/2026\/02\/event_145247_original-1.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_feature_large\/media\/attachments\/2026\/02\/event_145247_original-1.jpg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/resolve\/event_feature_thumb\/media\/attachments\/2026\/02\/event_145247_original-1.jpg" }, "occurrence_count":1, "first_occurrence":21896925 } , "144579-21895510": { "datetime_modified":"20260130T083200", "datetime_start":"20260213T153000", "datetime_end":"20260213T170000", "has_end_time":1, "date_start":"2026-02-13", "date_end":"2026-02-13", "time_start":"15:30:00", "time_end":"17:00:00", "time_zone":"America\/Detroit", "event_title":"The Elasticity of Empire: Palestine, War, and the Point of the List", "occurrence_title":"", "combined_title":"The Elasticity of Empire: Palestine, War, and the Point of the List: Lisa Bhungalia, Assistant Professor of Geography and International Studies at UW-Madison", "event_subtitle":"Lisa Bhungalia, Assistant Professor of Geography and International Studies at UW-Madison", "event_type":"Presentation", "event_type_id":"16", "description":"This talk examines how US empire operates as a topological formation that projects its national security apparatus through mediated arrangements of power, mobile technologies, and blurred genres of rule that link far-flung sites in intimate and often indeterminate ways. Drawing on over a decade of research conducted in Palestine on the embedding of Washington\u2019s counterterrorism regime into monetary transactions and aid flows inbound to the Palestinians, this talk presents a different analytic of the US war state \u2013 one that realizes its destructive effects not only through spectacular modalities of violence and warfare, but increasingly so, through a quieter, temporally stretched process of constriction that progressively erodes conditions of livability through forced disconnection and isolation.\n \n ---\n \n Lisa Bhungalia is an Assistant Professor of Geography and International Studies at the University of Wisconsin-Madison and core faculty member of the Middle East Studies Program. Their research examines evolving modalities of late-modern war, empire and transnational linkages between the US and Southwest Asian and North African region. Their first book, Elastic Empire: Refashioning War through Aid in Palestine, published by Stanford University Press in 2024, traces the deepening entanglements of aid, law, and war in Palestine with attention to the surveillance and policing regimes produced through the embedding of counterterrorism laws and infrastructures into civilian aid flows. They are also currently developing new research on the embedding of sanctions regimes into global circuits of finance. They are the recipient of the Middle East Studies Association 2024 Albert Hourani Book Award, the Middle East Monitor 2024 Palestine Academic Book Award, and the American Association of Geographers 2025 Glenda Laws Award, and their research has been supported by the American Council of Learned Societies, National Science Foundation, and Palestinian American Research Center, among other bodies.\n\nIf there is anything we can do to make this event accessible to you, please contact us at is-michigan@umich.edu. Please be aware that advance notice is necessary as some accommodations may require more time for the university to arrange.", "occurrence_notes":null, "guid":"144579-21895510@events.umich.edu", "permalink":"http:\/\/events.umich.edu\/event\/144579", "building_id":"1000165", "building_name":"Weiser Hall", "campus_maps_id":"47", "room":"Room 555", "location_name":"Weiser Hall", "has_livestream":0, "cost":"", "tags":["international","Palestine"], "website":"", "sponsors":[ { "group_name":"Program in International and Comparative Studies", "group_id":"3236", "website":"http:\/\/www.ii.umich.edu\/pics" }, { "group_name":"International Institute", "group_id":"1968", "website":"http:\/\/www.ii.umich.edu" }, { "group_name":"Department of Political Science", "group_id":"3610", "website":"" }, { "group_name":"Arab and Muslim American Studies (AMAS)", "group_id":"3630", "website":"" } ], "image_url":"https:\/\/events.umich.edu\/media\/attachments\/2026\/01\/event_144579_original-1.jpg", "styled_images":{ "event_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_thumb\/media\/attachments\/2026\/01\/event_144579_original-1.jpg", "event_large":"https:\/\/events.umich.edu\/media\/cache\/event_large\/media\/attachments\/2026\/01\/event_144579_original-1.jpg", "event_large_2x":"https:\/\/events.umich.edu\/media\/cache\/event_large_2x\/media\/attachments\/2026\/01\/event_144579_original-1.jpg", "event_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/event_large_lightbox\/media\/attachments\/2026\/01\/event_144579_original-1.jpg", "group_thumb":"https:\/\/events.umich.edu\/media\/cache\/group_thumb\/media\/attachments\/2026\/01\/event_144579_original-1.jpg", "group_thumb_square":"https:\/\/events.umich.edu\/media\/cache\/group_thumb_square\/media\/attachments\/2026\/01\/event_144579_original-1.jpg", "group_large":"https:\/\/events.umich.edu\/media\/cache\/group_large\/media\/attachments\/2026\/01\/event_144579_original-1.jpg", "group_large_lightbox":"https:\/\/events.umich.edu\/media\/cache\/group_large_lightbox\/media\/attachments\/2026\/01\/event_144579_original-1.jpg", "event_large_crop":"https:\/\/events.umich.edu\/media\/cache\/event_large_crop\/media\/attachments\/2026\/01\/event_144579_original-1.jpg", "event_list":"https:\/\/events.umich.edu\/media\/cache\/event_list\/media\/attachments\/2026\/01\/event_144579_original-1.jpg", "event_list_2x":"https:\/\/events.umich.edu\/media\/cache\/event_list_2x\/media\/attachments\/2026\/01\/event_144579_original-1.jpg", "event_grid":"https:\/\/events.umich.edu\/media\/cache\/event_grid\/media\/attachments\/2026\/01\/event_144579_original-1.jpg", "event_grid_2x":"https:\/\/events.umich.edu\/media\/cache\/event_grid_2x\/media\/attachments\/2026\/01\/event_144579_original-1.jpg", "event_feature_large":"https:\/\/events.umich.edu\/media\/cache\/event_feature_large\/media\/attachments\/2026\/01\/event_144579_original-1.jpg", "event_feature_thumb":"https:\/\/events.umich.edu\/media\/cache\/event_feature_thumb\/media\/attachments\/2026\/01\/event_144579_original-1.jpg" }, "occurrence_count":1, "first_occurrence":21895510 } }