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Rotations in Lebanon inferred from new palaeomagnetic data and implications for the evolution of the Dead Sea Transform system

By
B. Henry
B. Henry
1
Paléomagnétisme
,
IPGP and CNRS
,
4 avenue de Neptune, 94107 Saint-Maur cedex
,
France
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;
C. Homberg
C. Homberg
2
Université Pierre et Marie Curie
,
ISTeP, CNRS, Case 129, 4 place Jussieu, 75252 Paris cedex 05
,
France
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;
M. Mroueh
M. Mroueh
3
Lebanese University
,
Faculté d'Agronomie, B.P. 13-5368 Chourane, Beyrouth 1102-2040
Lebanon
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;
W. Hamdan
W. Hamdan
3
Lebanese University
,
Faculté d'Agronomie, B.P. 13-5368 Chourane, Beyrouth 1102-2040
Lebanon
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;
F. Higazi
F. Higazi
3
Lebanese University
,
Faculté d'Agronomie, B.P. 13-5368 Chourane, Beyrouth 1102-2040
Lebanon
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Published:
January 01, 2010

Abstract

A study carried out on widespread sites of the Aptian–Albian formations in Lebanon led to two palaeomagnetic directions corresponding to the primary magnetization (N=37 sites, D=307.1°, I=23.7°, k=18 and α95=5.5° after tilt correction and to a post-folding remagnetization (N=18 sites, D=346.3°, I=49.2°, k=108 and α95=3.2° before tilt correction). Comparison of these data with previous palaeomagnetic results for the Jurassic age in Lebanon and expected directions from African apparent polar wander path yields evidence of three different counter-clockwise regional rotations, of the order of 33° before Aptian deposition, of 11° during Late Miocene times, and of 18° since Miocene period. The two last rotations are related to the relative displacement of the African and Arabian plates. A model is proposed for the evolution of this particular Middle East area, in which the Dead Sea Transform shows a strong deviation relative to its main north–south orientation.

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Contents

Geological Society, London, Special Publications

Evolution of the Levant Margin and Western Arabia Platform since the Mesozoic

C. Homberg
C. Homberg
University Pierre et Marie Curie, France
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;
M. Bachmann
M. Bachmann
University of Bremen, Germany
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Geological Society of London
Volume
341
ISBN electronic:
9781862395893
Publication date:
January 01, 2010

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