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From strike-slip faulting to oblique subduction: a survey of the Alpine Fault-Puysegur Trench transition, New Zealand, Results of Cruise Geodynz-sud Leg 2

Citation

Delteil, J and Collot, JY and Wood, R and Herzer, R and Calmant, S and Christoffel, D and Coffin, MF and Ferriere, J and Lamarche, G and Lebrun, JF and Mauffret, A and Pontoise, B and Popoff, M and Ruellan, E and Sosson, M and Sutherland, R, From strike-slip faulting to oblique subduction: a survey of the Alpine Fault-Puysegur Trench transition, New Zealand, Results of Cruise Geodynz-sud Leg 2, Marine Geophysical Researches: An International Journal for The Study of The Earth Beneath The Sea, 18, (2-4) pp. 383-399. ISSN 0025-3235 (1996) [Refereed Article]


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Copyright Statement

Copyright 1996 Kluwer Academic Publishers. The final publication is available at http://www.springerlink.com

DOI: doi:10.1007/BF00286086

Abstract

The Geodynz-sud cruise on board the R/V l'Atalante collected bathymetric, side-scan sonar and seismic reflection data along the obliquely convergent boundary between the Australian and Pacific plates southwest of the South Island, New Zealand. The survey area extended from 4405 S to 4940 S, covering the transition zone between the offshore extension of the Alpine Fault and the Puysegur Trench and Puysegur Ridge. Based on variations in the nature and structure of the crust on either side of the margin, the plate boundary zone can be divided into three domains with distinctive structural and sedimentary characteristics. The northern domain involves subduction of probably thinned continental crust of the southern Challenger Plateau beneath the continental crust of Fiordland. It is characterized by thick sediments on the downgoing slab and a steep continental slope disrupted by fault scarps and canyons. The middle domain marks the transition between subduction of likely continental and oceanic crust defined by a series of en echelon ridges on the downgoing slab. This domain is characterized by a large collapse terrace on the continental slope which appears to be due to the collision of the en echelon ridges with the plate margin. The southern domain involves subduction of oceanic crust beneath continental and oceanic crust. This domain is characterized by exposed fabric of seafloor spreading on the downgoing slab, a steep inner trench wall and linear ridges and valleys on the Puysegur ridge crest. The data collected on this cruise provide insights into the nature and history of both plates, and factors influencing the distribution of strike-slip and compressive strain and the evolution of subduction processes along a highly oblique convergent margin.

Item Details

Item Type:Refereed Article
Keywords:New Zealand - Puysegur Trench - Puysegur Ridge - swath bathymetry - oblique subduction - strike-slip
Research Division:Earth Sciences
Research Group:Geology
Research Field:Marine Geoscience
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Earth Sciences
Author:Coffin, MF (Professor Mike Coffin)
ID Code:73795
Year Published:1996
Web of Science® Times Cited:35
Deposited By:Research Division
Deposited On:2011-10-26
Last Modified:2011-11-09
Downloads:0

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