[Eoas-seminar] geomorphology seminar 3-4pm on 3/29 (Tuesday) in EOA 1050

[eoas-seminar at lists.fsu.edu]

Dear All,

Dr. Daniel O'Hara, a candidate of the geomorphologist faculty position, will visit EOAS on the coming Monday and Tuesday, and he will give his interview talk 3-4pm on Tuesday (3/29) in EOA 1050. Below is the title and abstract of his talk. You can also join the seminar online via zoom, https://fsu.zoom.us/j/94970861161. Please let me know if you have any questions. Thanks.

>From the Crust to the Atmosphere: Using Topography to Investigate Magmatism and Erosion within Volcanic Settings

Topography within volcanic provinces records the multi-scale interactions between crustal magmatism and climate. Volcanic process cumulatively build topography through short-term episodes of intrusion-based surface uplift and surface mantling by extrusive deposits, while climate-based erosion acts to degrade the landscape over longer periods. Despite the prominence of volcanic terrain throughout the world, little has been done to disentangle the signals and feedbacks between topography, magmatism, and climate. More generally, geomorphic study of tightly coupled uplift and erosion (in space and time) within landscapes is poorly understood, making volcanic terrains an ideal template to investigate bedrock landscapes. In this talk, I present my investigation of these relationships over various scales. Using numerical modeling, I first analyze the impact of localized and transient uplift, such as from magmatic intrusions, on both regional-scale topographic construction and landscape evolution, finding distinct regimes of landscape evolution including long-standing surficial imprints that influence drainage formation. Afterwards, I investigate volcanic edifice morphology and degradation through the lens of drainage development, deriving new temporal relationships for basin evolution that can further intuit edifice volcanic records. Finally, I explore the arc-scale relationships between climate, magmatism, and topography within the Cascades Arc throughout the Quaternary. I first pair a database of ~3000 volcanic vents with crustal geophysical studies to analyze the correspondence between subsurface magmatism and overlying topography. Afterwards, I derive edifice erosion rates throughout the Cascades and relate these to precipitation (rain+snow) and glaciation to posit a novel long-term feedback between volcanism and climate in arcs.

Ming
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Ming Ye, Ph.D.
Professor in Hydrogeology
Department of Earth, Ocean, and Atmospheric Science
Department of Scientific Computing

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