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Re-created early Oligocene seabed bathymetry and process-based simulations of the Peira Cava turbidite system

Tor E. Aas, John A. Howell, Michal Janocko and Ivar Midtkandal
Re-created early Oligocene seabed bathymetry and process-based simulations of the Peira Cava turbidite system
Journal of the Geological Society of London (September 2010) 167 (5): 857-875

Abstract

Sea-floor bathymetry is one of the principal controls on the routing of turbidity currents and the subsequent distribution of deposited sediments. Re-created sea-floor bathymetry is thus one of the main inputs for process-based numerical simulation of ancient turbidite systems. The sea floor underlying the Early Oligocene deposits of the Peira Cava basin (Alpine foreland, southern France) has been re-created from an outcrop dataset by subjecting a surface-based 3D model to stepwise backstripping of overburden and removal of the post-depositional structural overprint. The surfaces that make up the 3D model were constructed based on field data including stratigraphic correlations, structural measurements and geological maps. Since deposition the Peira Cava turbidites have been folded, faulted, tilted, uplifted and partly eroded, all of which was summarized and then accounted for during re-creation of the palaeo-sea floor. Uncertainties associated with the input parameters used for the re-creation include the lithological composition of the overburden and underburden, palaeo-water depth and structural restoration. The impact of these uncertainties was addressed by creating a range of scenarios within viable ranges for each of the separate parameters and then comparing the relief and geometry of re-created surfaces. Two mid-case palaeobathymetric surfaces were selected and used as input for process-based simulation of turbidity currents using commercially available software designed for modelling density flows. The simulation results were compared with the stratigraphic architecture observed at outcrop. The quality of the correlation was used as a test of how well the re-created palaeobathymetry mimics the true ancient sea floor.


ISSN: 0016-7649
EISSN: 2041-479X
Coden: JGSLAS
Serial Title: Journal of the Geological Society of London
Serial Volume: 167
Serial Issue: 5
Title: Re-created early Oligocene seabed bathymetry and process-based simulations of the Peira Cava turbidite system
Affiliation: University of Bergen, Centre for Integrated Petroleum Research, Bergen, Norway
Pages: 857-875
Published: 201009
Text Language: English
Publisher: Geological Society of London, London, United Kingdom
References: 103
Accession Number: 2010-087197
Categories: Stratigraphy
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., strat. col., 3 tables, geol. sketch map
N43°55'60" - N43°55'60", E07°22'00" - E07°22'00"
Secondary Affiliation: University of Oslo, NOR, Norway
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201046
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