The d'Entrecasteaux Zone-New Hebrides Island Arc collision zone: an overview

Abstract:

The d'Entrecasteaux Zone, encompassing the North d'Entrecasteaux Ridge and the Bougainville Guyot, collide with the central New Hebrides Island Arc. The d'Entrecasteaux Zone trends slightly oblique to the 10 cm/yr relative direction of plate motion so that the ridge and the guyot scrap slowly (2.5 cm/yr) north, parallel to the trench. The North d'Entrecasteaux Ridge consists of Paleogene mid-ocean ridge basalt basement and Pliocene and to Pleistocene sediment. The Bougainville Guyot is an andesitic, middle Eocene volcano capped with upper Oligocene to lower Miocene and Miocene to Pliocene lagoonal limestones. Geophysical and geologic data collected prior to Leg 134 indicate that the two collision zones differ in morphology and structure. -from Authors

Año de publicación:

1992

Keywords:

Fuente:

scopus