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Comptes Rendus Géoscience
Volume 336, n° 9
pages 815-825 (juillet 2004)
Doi : 10.1016/j.crte.2004.02.007
Received : 24 June 2003 ;  accepted : 4 February 2004
The Liuchiu Hsu island offshore SW Taiwan: tectonic versus diapiric anticline development and comparisons with onshore structures

Olivier  Lacombe a * ,  Jacques  Angelier a ,  Frédéric  Mouthereau a ,  Hao-Tsu  Chu b ,  Benoît  Deffontaines c ,  Jian-Cheng  Lee d ,  Muriel  Rocher e ,  Rou-Fei  Chen a ,  Lionel  Siame f
aLaboratoire de Tectonique, Université Pierre et Marie Curie, 4, place Jussieu, 75252 Paris cedex 05, France 
bCentral Geological Survey, Taipei, Taiwan 
cLaboratoire de Géomorphologie et Environnement littoral, EPHE, 35800 Dinard, France 
dAcademia sinica, Taipei, Taiwan 
eIRSN, DPRE/SERGD/BERSSIN, BP17, 92262 Fontenay-aux Roses, France 
fCEREGE, 13545 Aix-en-Provence, France 

*Corresponding author.

A structural and microtectonic analysis performed in the Liuchiu Hsu island demonstrates that its Plio-Pleistocene tectonic evolution was dominated by alternating NW-SE shortening and local radial extension caused by mud diapirism. Previous models based on seismic data considering both the formation of the Liuchiu Hsu island and the fold development in SW Taiwan as mainly driven by mud diapirism, fail to account for both the asymmetry of the west vergent thrust-related anticlines onshore and the elongated character of the ridges formed by diapir alignments offshore, which rather argue in favour of a tectonic origin. To cite this article: O. Lacombe et al., C. R. Geoscience 336 (2004).


Une analyse structurale et microtectonique effectuée dans l'île de Liuchiu Hsu montre que son histoire plio-pléistocène a été dominée par l'alternance entre un serrage NW-SE et une extension radiale locale liée à la remontée d'un diapir de boue. Les modèles précédents fondés sur les données sismiques et considérant les phénomènes diapiriques comme le moteur essentiel de la genèse de l'île et des plis du Sud-Ouest de Taiwan ne rendent bien compte, ni de l'asymétrie des anticlinaux associés aux chevauchements à terre, ni de la forme allongée des rides formées par l'alignement des diapirs en mer, qui suggèrent plutôt une origine tectonique. Pour citer cet article : O. Lacombe et al., C. R. Geoscience 336 (2004).

Mots clés  : SW Taiwan ; Liuchiu Hsu island ; collision ; mud diapir ; accretionary wedge ; folds ; faults ; calcite twins ; paleostress.

Mots clés  : Sud-Ouest Taiwan ; île de Liuchiu Hsu ; collision ; diapir de boue ; prisme d'accrétion ; plis ; failles ; macles de la calcite ; paléocontraintes.

© 2004  Académie des sciences@@#104156@@

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