SEPM Deepwater Research Group
Annual Meeting Report
Date: Monday, June 20, 2016, 7-10 PM
Location: Calgary Telus Convention Centre, Calgary, Canada
The 2016 DWRG Organizers
Program Events were as follows:
The 2016 DWRG invited Steve Hubbard and Matthieu Cartigny to tackle the connection between modern process measurements in submarine channels and the expression of submarine channels in the sedimentary rock record.
Steve Hubbard presented results from characterization of the deepwater Tres Pasos Formation, in southern Chile. Steve and colleagues used the outcrop to investigate how deepwater channels are initiated and maintained. Steve suggested that the long-term evolution of channel systems is captured in outcrops. He documented deepwater channel axis to margin facies associations bounded by composite erosional surfaces. Key challenge in the context of this meeting is the following: How are shorter hydraulic timescales represented in the record, and what are the typical hydraulics that result in the characteristics of channel deposits at the facies, bed, and bed-set scales? Hubbard hypothesized that common “secondary” erosional surfaces could record erosion across knickpoints within a “primary” channel form. Discussion with the research group was focused on the temporal evolution of incision and deposition in the different axial-margin domains of the channel, as well as the question “which type of observations/measurements should we look for in the rock record if we want to test the hypothesis of knickpoint association with secondary surfaces?”
Matthieu Cartigny presented several years of observations of sediment-gravity flows in four deepwater canyon-channel systems: Monterey, Congo, Squamish, and Bute. Cartigny and colleagues showed knickpoints with a wavelength of many kilometers, and a vertical amplitude of up to 20 m. Sequential monitoring of sites over the course of a few years indicates upstream migration with a rate of hundreds of meters to a few kilometers per year. The large scale knickpoints are associated with smaller scale superposed crescentic bedforms. Matthieu concluded with a hypothetical block model of facies associations of these migrating knickpoints and associated crescentic shaped bedforms. This diagram formed the basis for a lively discussion that attempted to answer the question raised before the break.
Please contact one of the DWRG Organizers (listed above) or Hayley Cooney at SEPM headquarters: firstname.lastname@example.org