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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 and Anne Becel
Subsurface controls on the development of the Cape Fear Slide Complex, central US Atlantic margin (in Subaqueous mass movements and their consequences; assessing geohazards, environmental implications and economic significance of subaqueous landslides, D. G. Lintern (editor), D. C. Mosher (editor), Lorena G. Moscardelli (editor), P. T. Bobrowsky (editor), C. Campbell (editor), J. D. Chaytor (editor), J. J. Clague (editor), A. Georgiopoulou (editor), P. Lajeunesse (editor), Alexandre Normandeau (editor), David J. W. Piper (editor), M. Scherwath (editor), C. Stacey (editor) and Dominique Turmel (editor))
Special Publication - Geological Society of London (March 2018) 477 (1): 169-181

Abstract

The Cape Fear Slide is one of the largest (>25 000 km (super 3) ) 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 degrees ) 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.


ISSN: 0305-8719
Coden: GSLSBW
Serial Title: Special Publication - Geological Society of London
Serial Volume: 477
Serial Issue: 1
Title: Subsurface controls on the development of the Cape Fear Slide Complex, central US Atlantic margin
Title: Subaqueous mass movements and their consequences; assessing geohazards, environmental implications and economic significance of subaqueous landslides
Author(s): Hill, Jenna C.Brothers, Daniel S.Hornbach, Matthew J.Sawyer, Derek E.Shillington, Donna J.Becel, Anne
Author(s): Lintern, D. G.editor
Author(s): Mosher, D. C.editor
Author(s): Moscardelli, Lorena G.editor
Author(s): Bobrowsky, P. T.editor
Author(s): Campbell, C.editor
Author(s): Chaytor, J. D.editor
Author(s): Clague, J. J.editor
Author(s): Georgiopoulou, A.editor
Author(s): Lajeunesse, P.editor
Author(s): Normandeau, Alexandreeditor
Author(s): Piper, David J. W.editor
Author(s): Scherwath, M.editor
Author(s): Stacey, C.editor
Author(s): Turmel, Dominiqueeditor
Affiliation: U. S. Geological Survey, Pacific Coastal and Marine Science Center, Santa Cruz, CA, United States
Pages: 169-181
Published: 20180328
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 52
Accession Number: 2018-045509
Categories: OceanographyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., sketch maps
N33°00'00" - N36°00'00", W76°00'00" - W74°00'00"
Secondary Affiliation: Southern Methodist University, USA, United StatesOhio State University, USA, United StatesLamont-Doherty Earth Observatory, USA, United States
Source Note: Online First
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2020, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201824
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