Morphostructure of an incipient subduction zone along a transform plate boundary: Puysegur Ridge and Trench

Abstract

Research Article| June 01, 1995 Morphostructure of an incipient subduction zone along a transform plate boundary: Puysegur Ridge and Trench Jean-Yves Collot; Jean-Yves Collot 1L'Institut Français de Recherche Scientifique pour le Développement en Coopération, B.P. 48, Villefranche sur mer 06230, France Search for other works by this author on: GSW Google Scholar Geoffroy Lamarche; Geoffroy Lamarche 1L'Institut Français de Recherche Scientifique pour le Développement en Coopération, B.P. 48, Villefranche sur mer 06230, France Search for other works by this author on: GSW Google Scholar Ray A. Wood; Ray A. Wood 2Institute of Geological and Nuclear Sciences, P.O. Box 30368, Lower Hutt, New Zealand Search for other works by this author on: GSW Google Scholar Jean Delteil; Jean Delteil 3Institut de Géodynamique, rue A. Einstein 06560, Sophia Antipolis, Valbonne, France Search for other works by this author on: GSW Google Scholar Marc Sosson; Marc Sosson 3Institut de Géodynamique, rue A. Einstein 06560, Sophia Antipolis, Valbonne, France Search for other works by this author on: GSW Google Scholar Jean-Frédéric Lebrun; Jean-Frédéric Lebrun 3Institut de Géodynamique, rue A. Einstein 06560, Sophia Antipolis, Valbonne, France Search for other works by this author on: GSW Google Scholar Mike F. Coffin Mike F. Coffin 4Institute for Geophysics, University of Texas, 8701 North Mopac Expressway, Austin, Texas 78759-8397 Search for other works by this author on: GSW Google Scholar Author and Article Information Jean-Yves Collot 1L'Institut Français de Recherche Scientifique pour le Développement en Coopération, B.P. 48, Villefranche sur mer 06230, France Geoffroy Lamarche 1L'Institut Français de Recherche Scientifique pour le Développement en Coopération, B.P. 48, Villefranche sur mer 06230, France Ray A. Wood 2Institute of Geological and Nuclear Sciences, P.O. Box 30368, Lower Hutt, New Zealand Jean Delteil 3Institut de Géodynamique, rue A. Einstein 06560, Sophia Antipolis, Valbonne, France Marc Sosson 3Institut de Géodynamique, rue A. Einstein 06560, Sophia Antipolis, Valbonne, France Jean-Frédéric Lebrun 3Institut de Géodynamique, rue A. Einstein 06560, Sophia Antipolis, Valbonne, France Mike F. Coffin 4Institute for Geophysics, University of Texas, 8701 North Mopac Expressway, Austin, Texas 78759-8397 Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1995) 23 (6): 519–522. https://doi.org/10.1130/0091-7613(1995)023<0519:MOAISZ>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Jean-Yves Collot, Geoffroy Lamarche, Ray A. Wood, Jean Delteil, Marc Sosson, Jean-Frédéric Lebrun, Mike F. Coffin; Morphostructure of an incipient subduction zone along a transform plate boundary: Puysegur Ridge and Trench. Geology 1995;; 23 (6): 519–522. doi: https://doi.org/10.1130/0091-7613(1995)023<0519:MOAISZ>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Multibeam bathymetric and geophysical data reveal a major strike-slip fault that extends along the summit of the Puysegur Ridge east of the Puysegur Trench. The northward structural development of this ridge-trench system illustrates the evolution of an incipient subduction zone along a transform plate boundary that has been subjected to increasing transverse shortening during the past 10 m.y. At the southern end of the trench, where subduction has not yet started, the Puysegur Ridge has a narrow (<50 km) steep-sided cross section, and the axial strike-slip fault separates a shallow (125–625 m), flat-topped eastern crest from a deeper (400–1600 m) western crest; these characteristics indicate differential uplift during the initial stage of shortening. On the lower plate an incipient, 5.2-km-deep trench developed in conjunction with normal and reverse faults, suggesting strong interplate coupling across the trench. Northward, the ridge broadens linearly to 80 km wide, its western flank has locally collapsed, and the ridge summit has subsided, possibly by 1.5 km, suggesting that the interplate coupling decreases and that a Benioff zone is being formed. Concomitant to the northward ridge evolution, the trench deepens to 6.2 km and normal fault throws increase along its outer wall, indicating greater flexure of the downgoing plate. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.