Evidence for sinistral strike-slip deformation in The Solomon Island arc |
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| Authors: | J. -M. Auzende L. Géli H. Ondréas J. -Y. Collot Y. Lafoy J. -P. Eissen E. Gracia M. B. Larue C. Olisukulu D. Tolia N. Biliki |
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| Affiliation: | (1) Ifremer/CB, BP 70, 29280 Plouzané, France;(2) Centre ORSTOM de Villefranche/Mer, France;(3) Service de l'Energie et des Mines, Nouméa, Nouvelle Calédouie;(4) Centre ORSTOM de Brest, France;(5) Université de Bretagne Occidentale, France;(6) SOPAC, Fiji;(7) Hydrographic Department, Solomon Islands;(8) Ministry of Natural Resources, Solomon Islands;(9) Present address: Laboratorie de Géologie-Géophysique, BPA5 Centre ORSTOM de Nouméa, Nouvelle Calédouie;(10) Present address: Institute of Geological and Nuclear Sciences, PO Box 1320, Wellington, New Zealand |
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| Abstract: | During the SOPACMAPS 2 crusie carried out by IFREMER (Institut Français de Recherche pour l'Exploitation de la Mer) and ORSTOM (Institut Français de Recherche Scientifique pour le dévelopement en Coopération) on theR/V L'Atalante, in the Central Solomon Arc area, multibeam bathymetric and imagery data and single-channel seismic reflection profiles were collected from an area of about 3500 km2, to evaluate regional tectonics. Structural data geophysical profiles interpretation provide evidence for left-lateral transtensional tectonics on the southern edge of the Central Solomon Trough. This transtensional deformation is represented by faulting, block tilting, and rhombohedral deformation. The regional geology and the analysis of the sedimentary cover allow us to demonstrate that this tectonic occurred in two different phases during Oligocene to Miocene and Pliocene to Pleistocene times. |
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