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GEOREF RECORD

Closure of the Tornquist Sea; constraints from MONA LISA deep seismic reflection data

R. W. England, R. W. Hobbs, P. K. H. Maguire, T. Abramovitz, A. Berthelsen, F. Schjoth, H. Thybo, N. Balling, L. Nielsen, E. R. Flueh, S. Huebinger, T. Reston, L. B. Pedersen and J. Schmidt
Closure of the Tornquist Sea; constraints from MONA LISA deep seismic reflection data
Geology (Boulder) (December 1997) 25 (12): 1071-1074

Abstract

Deep seismic reflection profiles west of Denmark across the suture between Baltica and Eastern Avalonia reveal weak, southward-dipping reflectors within the crystalline basement. These reflectors are interpreted as thrusts resulting from emplacement of Eastern Avalonia onto the southern edge of Baltica. North of these reflectors are the remains of a dissected Silurian foredeep. The presence of this foredeep and the 440 Ma age of metamorphism in rocks recovered from boreholes into Eastern Avalonian rocks suggest that closure of the Tornquist sea occurred in the Late Ordovician, which is consistent with paleobiogeographic data and paleomagnetic apparent polar wander paths for Eastern Avalonia and Baltica. The similarity between these reflection data and the BABEL AC profile permits correlation of reflectors beneath Denmark into the southern North Sea.


ISSN: 0091-7613
EISSN: 1943-2682
Coden: GLGYBA
Serial Title: Geology (Boulder)
Serial Volume: 25
Serial Issue: 12
Title: Closure of the Tornquist Sea; constraints from MONA LISA deep seismic reflection data
Affiliation: Bullard Laboratory, BIRPS, Cambridge, United Kingdom
Affiliation: MONA LISA Working Group
Pages: 1071-1074
Published: 199712
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
Accession Number: 1997-072445
Categories: Solid-earth geophysicsApplied geophysics
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus.
N54°15'00" - N58°00'00", E08°00'00" - E13°00'00"
N51°00'00" - N61°10'00", W04°00'00" - E11°00'00"
Secondary Affiliation: University of Leicester, GBR, United KingdomUniversity of Copenhagen, DNK, DenmarkAarhus University, DNK, DenmarkUniversity of Kiel, DEU, Federal Republic of GermanyUppsala University, SWE, Sweden
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 199724
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