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Webinar: How Mantle Dynamics guided the main phases of Himalayan Crustal Tectonics ?

  • August 2 @ 7:00 pm - 8:30 pm

  • | Free

GeoScience for Sustainable Development
Topic: “How Mantle Dynamics guided the main phases of Himalayan crustal tectonics ?”

Models of Himalayan tectonics have focused on crustal processes and climatic-crustal interactions, with mantle processes commonly relegated to a convergent boundary condition with a static geometry. Insights into mantle dynamism over the past decade give us an opportunity to consider a more active role for the mantle in shaping crustal tectonics. Cycles of underthrusting, slab rollback, and slab break off, as well as overall mantle flow patterns, can exert first-order influence on accretionary modes and topographic evolution, and thereby on surface processes and climate-surface interactions. This talk will explore how such mantle dynamics determined (1) the initiation and cessation of motion on the South Tibet fault as well as (2) the different accretionary styles that built the Tethyan, Greater, and Lesser Himalayan structural units. The concomitant impacts on topographic, climatic, and biotic evolution will also be briefly discussed.

Presenter: Assoc Prof. Dr. Alexander Webb
Moderator: Asst. Prof. Dr. Basanta Raj Adhikari
Date: August 2 (Sunday), 2020
Time: 19:00 NPT (+5:45 GMT)

Short Bio on Presenter

Dr. Alex Webb first conducted Himalayan field work in the fall of 2003, during his PhD. Since then, he has authored nearly 30 papers on east Asian tectonics, principally focusing on the tectonic development of the Himalaya. Principal insights from his Himalayan work have centered on the accretionary modes of mountain-building, and the role of mantle processes in determining these accretionary processes. His other interests span from deformation of salt glaciers to the early development of terrestrial planets. His career has taken him from a PhD and brief postdoc at the University of California at Los Angeles, to posts at Louisiana State University, the University of Leeds, and now the University of Hong Kong. His current Himalayan tectonics funding support is from the Research Grants Council of Hong Kong.


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