Preliminary results of ODP Leg 134 in the collision zone between the New Hebrides island arc and the d'Entrecasteaux zone

Abstract:

Results of ODP Leg 134 indicate that the eastern d'Entrecasteaux zone (DEZ) is an immature intra-oceanic island arc along which subduction ceased prior to the Late Oligocene and that the DEZ emerged several times before the Late Pliocene or Early Pleistocene. The sedimentary cover of the North d'Entrecasteaux Ridge (NDR), which is part of the DEZ, is tectonically accreted at the toe of the inner wall of the New Hebrides trench and undergoes severe dewatering. Within the accreted rocks, fluids appear to concentrate along thrust zones. Directly east of the collision, the intra-arc North Aoba basin underwent a major tectonic event during the Late Pliocene or Early Pleistocene. During the Pleistocene, the axis of the basin migrated westward towards its present location. These events can be attributed to the DEZ-arc collision. There is an abridged English version. -English summary

Año de publicación:

1991

Keywords:

Fuente:

scopus