Subsurface controls on the development of the cape fear slide complex, central US Atlantic Margin

Jenna C. Hill, Daniel S. Brothers, Matthew J. Hornbach, Derek E. Sawyer, Donna J. Shillington, Anne Bécel

Research output: Contribution to conferencePaperpeer-review

3 Scopus citations

Abstract

The Cape Fear Slide is one of the largest (>25 000 km3) submarine slope failure complexes on the US Atlantic margin. Here we use a combination of new high-resolution multichannel seismic data (MCS) from the National Science Foundation Geodynamic Processes at Rifting and Subducting Margins (NSF GeoPRISMS) Community Seismic Experiment and legacy industry MCS to derive detailed stratigraphy of this slide and constrain the conditions that lead to slope instability. Limited outer-shelf and upper-slope accommodation space during the Neogene, combined with lowstand fluvial inputs and northwards Gulf Stream sediment transport, appears to have contributed to thick Miocene and Pliocene deposits that onlapped the lower slope. This resulted in burial of an upper-slope bypass zone developed from earlier erosional truncation of Paleogene strata. These deposits created a broad ramp that allowed accumulation of thick Quaternary strata across a low-gradient (<3.5°) upper slope. Upslope of one of the larger headwalls, undulating Quaternary strata appear to downlap onto a buried failure plane. Many of the nested headwalls of the upper-slope portion of slide complex are underlain by deformed strata, which may be the result of fluid migration associated with localized subsidence from salt migration. These new data and observations suggest that antecedent margin physiography, sediment loading and substrate fluid flow were key factors in preconditioning the Cape Fear slope for failure.

Original languageEnglish (US)
Pages169-181
Number of pages13
DOIs
StatePublished - 2018
Externally publishedYes
Event8th International Symposium on Submarine Mass Movements and Their Consequences, ISSMMTC 2018 - Victoria, Canada
Duration: May 7 2018May 9 2018

Conference

Conference8th International Symposium on Submarine Mass Movements and Their Consequences, ISSMMTC 2018
Country/TerritoryCanada
CityVictoria
Period5/7/185/9/18

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Nuclear and High Energy Physics

Fingerprint

Dive into the research topics of 'Subsurface controls on the development of the cape fear slide complex, central US Atlantic Margin'. Together they form a unique fingerprint.

Cite this