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Using bathymetry to identify basin inversion structures on the English Channel shelf

Jenny S. Collier, Sanjeev Gupta, Graeme Potter and Andy Palmer-Felgate
Using bathymetry to identify basin inversion structures on the English Channel shelf
Geology (Boulder) (December 2006) 34 (12): 1001-1004

Abstract

High-resolution bathymetry is used to derive a new structural interpretation of a submerged inverted graben on the English Channel shelf (northwest Europe). The bathymetry provides a continuous plan-view image of the bedrock geology and resolves fine structural detail, particularly in areas of steeply dipping strata where traditional seismic imaging fails. The imagery, combined with shallow core, deep borehole, and two-dimensional seismic reflection data, shows a marked asymmetry in the bedrock outcrop and structural style, both across and along the axis of the basin. For example, the oldest synrift rocks crop out in a complex south-verging anticline along one margin, whereas more massively bedded younger rocks are folded into a simpler anticline at the other. Comparison of our observations with both recent analog modeling and a neighboring inverted basin highlights the importance of the mechanical properties of the basin stratigraphy in controlling the structural development. We conclude that the inversional asymmetry developed because of the distribution of strong competence contrasts within the synrift fill.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 34
Serial Issue: 12
Title: Using bathymetry to identify basin inversion structures on the English Channel shelf
Affiliation: Imperial College, Department of Earth Science and Engineering, London, United Kingdom
Pages: 1001-1004
Published: 200612
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 18
Accession Number: 2006-091352
Categories: Structural geologyApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. sects., sketch maps
N50°40'00" - N50°45'00", W01°30'00" - W01°00'00"
Secondary Affiliation: UK Hydrographic Office, GBR, United Kingdom
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200651
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