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Salt tectonics in and around the Nile deep-sea fan: Insights from the PRISMED II cruise

By
Virginie Gaullier
Virginie Gaullier
1
CEFREM, Université de Perpignan
66860 Perpignan, France
gaullier@univ-perp.fr
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Yossi Mart
Yossi Mart
2
Recanati Center for Marine Studies, Haifa University
31905 Haifa, Israel
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Gilbert Bellaiche
Gilbert Bellaiche
3
Observatoire Océanologique, Géosciences-Azur
06235 Villefranche-sur-Mer, France
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Jean Mascle
Jean Mascle
3
Observatoire Océanologique, Géosciences-Azur
06235 Villefranche-sur-Mer, France
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Bruno C. Vendeville
Bruno C. Vendeville
4
Bureau of Economic Geology, University of Texas at Austin
Austin, TX 78713-8924, USA
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Tiphaine Zitter
Tiphaine Zitter
5
Free University, Faculty of Earth Sciences
1081 HV Amsterdam, The Netherlands
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Second Leg Prismed II Scientific Party
Second Leg Prismed II Scientific Party
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Published:
January 01, 1999

Abstract

The recent PRISMED II geophysical survey has documented various styles of salt tectonics in and around the Nile deep-sea fan (Eastern Mediterranean Sea). The first main type of salt-related structures comprises listric normal growth faults and grabens, trending roughly perpendicular to the slope line of the Nile Cone. These faults and associated salt structures result from thin-skinned extension, driven by gravity gliding and spreading as a result of sediment loading of the Plio-Quaternary overburden above the Messinian evaporites, which acted as a décollement layer. The second major type of salt structures consists of lineaments that obliquely intersect the continental slope of the Nile deep-sea fan. These structures may have had some strike-slip movement, and salt diapirs grew reactively or were deformed by fault-block movement. In the western distal part of the Nile deep-sea fan, compressional tectonics of the adjacent Mediterranean Ridge caused the formation of a series of salt-cored folds and reverse faults above the Messinian evaporites. In the eastern distal part of the Nile Cone, sediment progradation progressively expelled salt northward, first forming small folds and tight diapirs, then a scarp of 400 m height around the Eratosthenes Seamount, corresponding to the basinward limit of salt deformation.

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Geological Society, London, Special Publications

Salt, Shale and Igneous Diapirs in and around Europe

Bruno C. Vendeville
Bruno C. Vendeville
University of Texas, USA
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Yossi Mart
Yossi Mart
University of Haifa, Israel
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Jean-Louis Vigneresse
Jean-Louis Vigneresse
Université Nancy, France
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Geological Society of London
Volume
174
ISBN electronic:
9781862394223
Publication date:
January 01, 1999

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