d'Entrecasteaux Zone,trench and western chain of the central New Hebrides island arc: Their significance and tectonic relationship |
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| Authors: | J Daniel H R Katz |
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| Institution: | (1) Office de la Recherche Scientifique et Technique Outre-Mer, B.P. A5, Noumea Cedex, Nouvelle-Calédonie;(2) New Zealand Geological Survey, PO Box 30368, Lower Hutt, New Zealand |
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| Abstract: | The absence of a trench and the existence of a separate, western chain of islands in the central New Hebrides island arc are
a consequence of earlier tectonic evolution, and not the result of subduction of the d'Entrecasteux Zone as was previously
suggested. Because of tectonic consolidation in the western islands prior to present subduction, a resistant block was created
opposing subduction, and a trench never did form, here. The d'Entrecasteux Zone is responsible only locally for additional
deformation of the subducting plate, in a way that can be regarded as an initial stage of obduction. |
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