Topic: "An outcrop analog for the Colville Foreland Basin from the southern Andes: Clinoforms of the Magallanes Basin, Chile"
Speaker: Dr. Stephen Hubbard (University of Calgary)
Clinoforms with >1000 m of relief that are at least 40 km long crop-out in the Magallanes Basin of southern Chile, recording the axial filling of a deep-water foreland during the Late Cretaceous. Fluvial- and wave-influenced deltaic deposits represent the upper, flat portions of the sigmoidal slope profiles (topset strata). Mudstone, siltstone, and a notable paucity of sandstone generally characterize upper- to lower-slope units (foreset to bottomset strata). However, punctuated delivery of coarse-grained sediment off the shelf edge is evident from channelized bodies composed of conglomerate lags and thick sandstone units. The clinoform-dominated stratigraphic architecture, scale and facies of the outcrop belt have been shown to share many analogous attributes with the Brookian-aged foreland basin fill of the North Slope, Alaska.
In 2009, a presentation to the AGS focused on a bourgeoning understanding of the recently discovered outcrop belt. This follow-up presentation will focus on the results of more than a decade of subsequent research, including facies characteristics and their distributions, geometrical characterization of reservoir-scale bodies, auto- and allo-genic controls on clinoform development (e.g., sediment supply, antecedent topography), and synthetic seismic responses of various portions of the immense outcrop belt. Overall, basin margin evolution and turbidite system characterization has been a primary focus over the last decade. However, a renewed focus on topset sedimentology and stratigraphy is a major current area of research, leveraging the unique opportunity to investigate the entirety of well-exposed shelf, slope to basin floor sediment routing systems.
Steve Hubbard joined the faculty in the Department of Geoscience at the University of Calgary in 2006, shortly after completing his PhD at Stanford University. Prior to his PhD he obtained BSc and MSc degrees at the University of Alberta and worked as a petroleum geologist at Shell Canada. His research, teaching and student mentorship is focused on topics in siliciclastic sedimentology and stratigraphy, as well as applications to petroleum geology. He specializes in the processes and products of channelized depositional systems, as well as convergent margin sedimentary basins.
Because of Physical Distancing September's meeting with be online only.
DATE: Thursday, September 17, 2020 - Virtual Meeting Online TIME: 12-1 pm LOCATION: Your home. Cost: Free. Bring your lunch to your computer.
WE WILL UPDATE THE LINK BELOW FOR THE SEPTEMBER 2020 MEETING. PLEASE CHECK BACK.