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March Luncheon
March Luncheon

Tue, Mar 19

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Bush Convention Center

March Luncheon

Exploring Shelf-Margin Architecture and Seismic Stratigraphy: Landsliding and Gully Formation Set Up Deep Water Delivery - Dr. Jacob Covault, The University of Texas at Austin, Jackson School of Geosciences, Bureau of Economic Geology

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Time & Location

Mar 19, 2024, 11:30 AM – 1:00 PM CDT

Bush Convention Center, 105 N Main St, Midland, TX 79701, USA

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About The Event

Please RSVP by 3:00pm on Friday, March 15, 2024.

Reservations made after the deadline will incur an additional fee of $10.

THANK YOU TO OUR MARCH LUNCHEON SPONSOR, EDGE SYSTEMS

LOCATION: In-Person luncheon meeting will be held at the Bush Convention Center. Virtual meeting on Zoom. 

TOPIC: Exploring Shelf-Margin Architecture and Seismic Stratigraphy: Landsliding and Gully Formation Set Up Deep Water Delivery

ABSTRACT: Submarine-channel networks connect deltas or littoral cells to sandy, deep-water fans. For passive continental margins, with wider shelves than tectonically active ones, sea-level fall can promote delta progradation to the shelf edge as the shoreline regresses. At the shelf edge, deltas are a staging area for terrigenous sediment delivery to deeper water. There are multiple ideas for the formation of the submarine channels that connect deltaic source areas to fans; for example, they can result from headward erosion of landslide scars forming on the shelf margin that capture sediment-gravity flows or from progressive widening of gullies sourced by deltas. Here, we use published ages and a large (nearly 4,000 sq. km) three-dimensional seismic-reflection dataset (dominant frequency in the shallow interval ~45 Hz) in the Gulf of Mexico, east of the Mississippi submarine canyon, to discover the timing of delta progradation to the shelf edge relative to sea level and interpret the processes of submarine-channel formation. At least three deltas of the Mobile and/or nearby rivers prograded to the shelf edge since Oxygen Isotope Stage (OIS) 14; these deltas are linked to submarine channels named Dorsey (>OIS 14), Sounder (OIS 8), and Lagniappe (OIS 2). All deltas, in sequence, prograded to a prominent shelf-edge growth fault. Landslides initiated at the growth fault when the Dorsey and Sounder deltas reached the shelf edge. The landslides reshaped the shelf edge and upper slope into chutes that captured and directed submarine channels into deeper water. Sea-level falls likely controlled delta progradation to the shelf edge; however, once there, events that oversteepened the margin, i.e., landsliding, promoted a period of slope readjustment when terrigenous sediment was bypassed to deeper water. The Lagniappe delta is much smaller than Dorsey and Sounder and it did not initiate landsliding, potentially as a result of lower overburden across the shelf-edge growth fault. Dorsey-Sounder channel evolution is useful as a process analog for older subsurface intervals of the Gulf of Mexico and other settings with delta-fed submarine-channel systems. Understanding submarine landslide occurrence and its impact on sediment dispersal through channels has implications for geohazard assessment in the Gulf of Mexico and other resource-rich basins. 

BIO: Dr. Jacob Covault is a Research Professor at the UT-Austin Quantitative Clastics Laboratory. His expertise is the geology of clastic depositional systems. Jacob applies his research to subsurface challenges in reservoir/storage characterization and geologic hazard assessment. Prior to his position at UT-Austin, Jacob was a research scientist at Chevron Energy Technology Company and the U.S. Geological Survey. He received Ph.D. and B.S. degrees in Geological and Environmental Sciences at Stanford University. The Quantitative Clastic Laboratory (QCL) is an industrial affiliates program at the Bureau of Economic Geology within the Jackson School of Geosciences at UT-Austin. The mission of the Quantitative Clastics Laboratory (QCL) is to develop a predictive understanding of processes and controls on sediment transport and the stratigraphic evolution of depositional systems, with applications in subsurface characterization, modeling, and correlation.

Tickets

  • RSVP (after deadline)

    This ticket is for the luncheon purchased AFTER the deadline.

    $35.00
  • Student

    This ticket is for current students purchased before the deadline (full time students only). Please bring student ID to check in. You may pay online or choose to pay at the door at checkout.

    $10.00
  • Virtual

    This ticket is to watch the luncheon live on Zoom. Current PBS-SEPM Members are able to watch the virtual luncheon at NO COST. Reach out to us if you did not receive your member promo code.

    $5.00
  • Luncheon Sponsorship

    Become a Luncheon Sponsor! Includes 2 Luncheon Tickets and opportunity to promote your company at the beginning of the luncheon for up to 3 minutes. Your logo will be included on [1] All Luncheon Advertisements (Social Media and Emails), [2] Full Page Advertisement on Luncheon Slides for that Month, [3] Luncheon Event Webpage, and [4] Table Signs. You may pay online or choose to pay at the door at checkout.

    $250.00
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