The collision zone between the North d'Entrecasteaux Ridge and the New Hebrides island arc. 1. Sea beam morphology and shallow structure

Abstract:

Sea Beam bathymetric data, closely spaced single-channel seismic reflection sections, and geopotential field data were collected aboard the R/V J. Charcot over the collision zone between the North d'Entrecasteaux Ridge (NDR) and the New Hebrides island arc. In this report we study the shallow structure, tectonic erosion, and consequent mass wasting of the accretionary complex, all of which were produced by the collision of the NDR in a complex deformational environment. The accretionary complex in this collision zone can be divided into northern, central, and southern parts. The geophysical data indicate that normal trench convergence has apparently produced only a few trench-parallel structures confined to the toe of the accretionary complex, whereas the along-trench motion of the NDR has resulted in well-developed structures that extend obliquely across the arc slope and form an asymmetric tectonic pattern. -from Authors

Año de publicación:

1991

Keywords:

Fuente:

scopus