Geoscience Seminar: March 3rd (Spring 2021)
When
Office/Remote Location
Description
The geoscience department weekly seminar presents:
Speaker: Dr. Alexander Tye
Topic: Formation of the Salarde Antofalladepression, PunaPlateau, Argentina by transient extension: an effect of lithospheric foundering
Although removal of negatively-buoyant lithosphere via foundering is thought to strongly affect the tectonic evolution of orogens, the effects of foundering on orogenic deformation and the geologic record remain relatively poorly constrained. New field observations, mapping, and geochronology from the southern Punaplateau, Argentina, reveal a complex late Cenozoic evolution of upper crustal deformation coeval with a foundering event hypothesized from geophysical and geochemical evidence. Our observations suggest that the Antofalladepression, an enigmatic, linear basin 125 km long, was formed by localized, syn-convergent extension beginning during Miocene time. Deformation of the southern Punaplateau was spatially heterogeneous, with coeval extension and shortening in different areas. The inferred spatial heterogeneity in deformation is inconsistent with a causal mechanism that would affect the entire orogen, such as slowing plate convergence, but is consistent with the heterogeneous effects of lithospheric foundering observed in numerical models.
Price
Free
Admission Information
The talk will be hosted through Webex.
Webex: Session ID: 1202938836
Session Password: ~w4yWu*uHS{D(3cS
Video Address: 1202938836@unlv.webex.com (SIP / H.323)
External Sponsor
Department of Geoscience