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The d'Entrecasteaux Zone (Southwest Pacific) : a petrological and geochronological reappraisal

Maillet Patrick, Monzier Michel, Selo M., Storzer D.. 1983. Elsevier.
The d'Entrecasteaux Zone (Southwest Pacific) : a petrological and geochronological reappraisal
ARTICLE, (1983 ) - PUBLISHEDVERSION - English (en-GB)
Elsevier
OPENACCESS - .
Audience : RESEARCHERS
Elsevier Science Publisher B.V.
Subject
TECTONIQUE DE PLAQUES, SUBDUCTION, TERTIAIRE, HAUT FOND, GEOLOGIE STRUCTURALE, SEDIMENTOLOGIE, PETROGRAPHIE, BASALTE, COMPOSITION CHIMIQUE, ROCHE VOLCANIQUE, DATATION, GEOCHRONOLOGIE
Domains
Géologie, Sciences de la Terre
Description

The D'Entrecasteaux Zone (Southwest Pacific) is an arched submarine horst- and graben structure, which extends from the northern end of the New Caledonia ridge to the western border of the New Hebrides island arc. A review of the bathymetry, seismic-reflection data, paleomagnetism, gravimetry, seismology and DSDP data available for this area is combined with a study of basaltic samples dredged along the horsts of this regional fracture zone. Their fissiontrack ages range between 56 Ma (Paleocene-Eocene boundary) and 36 Ma (Eocene-Oligocene boundary). It is suggested that the D'Entrecastreaux Zone represents the northern arcurate extension of the northeast-dipping Eocene subduction/obduction zone, located along the New Caledonia/Loyalty Islands ridge, while its present morphology appeared from post-obductionextensional movements, resulting in a progressive uplift of basaltic ocean floor since Middle Miocene times.

Keywords
Language
English (en-GB)
Creators
Maillet Patrick, Monzier Michel, Selo M., Storzer D.
Contributors
Sources
Marine Geology, 1983, 53 (3), p. 179-197.
Relation
Coverage
Name of newspaper
Elsevier