Rift topography linked to magmatism at the intermediate spreading Juan de Fuca Ridge

Abstract

Research Article| March 01, 2006 Rift topography linked to magmatism at the intermediate spreading Juan de Fuca Ridge Suzanne M. Carbotte; Suzanne M. Carbotte 1Lamont-Doherty Earth Observatory, Palisades, New York 10964, USA Search for other works by this author on: GSW Google Scholar Robert S. Detrick; Robert S. Detrick 2Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA Search for other works by this author on: GSW Google Scholar Alistair Harding; Alistair Harding 3Scripps Institution of Oceanography, La Jolla, California 92093, USA Search for other works by this author on: GSW Google Scholar Juan Pablo Canales; Juan Pablo Canales 4Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA Search for other works by this author on: GSW Google Scholar Jeffrey Babcock; Jeffrey Babcock 5Scripps Institution of Oceanography, La Jolla, California 92093, USA Search for other works by this author on: GSW Google Scholar Graham Kent; Graham Kent 5Scripps Institution of Oceanography, La Jolla, California 92093, USA Search for other works by this author on: GSW Google Scholar Emily Van Ark; Emily Van Ark 6Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA Search for other works by this author on: GSW Google Scholar Mladen Nedimovic; Mladen Nedimovic 7Lamont-Doherty Earth Observatory, Palisades, New York 10964, USA Search for other works by this author on: GSW Google Scholar John Diebold John Diebold 7Lamont-Doherty Earth Observatory, Palisades, New York 10964, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Suzanne M. Carbotte 1Lamont-Doherty Earth Observatory, Palisades, New York 10964, USA Robert S. Detrick 2Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA Alistair Harding 3Scripps Institution of Oceanography, La Jolla, California 92093, USA Juan Pablo Canales 4Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA Jeffrey Babcock 5Scripps Institution of Oceanography, La Jolla, California 92093, USA Graham Kent 5Scripps Institution of Oceanography, La Jolla, California 92093, USA Emily Van Ark 6Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA Mladen Nedimovic 7Lamont-Doherty Earth Observatory, Palisades, New York 10964, USA John Diebold 7Lamont-Doherty Earth Observatory, Palisades, New York 10964, USA Publisher: Geological Society of America Received: 04 Jul 2005 Revision Received: 17 Nov 2005 Accepted: 18 Nov 2005 First Online: 09 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2006) 34 (3): 209–212. https://doi.org/10.1130/G21969.1 Article history Received: 04 Jul 2005 Revision Received: 17 Nov 2005 Accepted: 18 Nov 2005 First Online: 09 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Suzanne M. Carbotte, Robert S. Detrick, Alistair Harding, Juan Pablo Canales, Jeffrey Babcock, Graham Kent, Emily Van Ark, Mladen Nedimovic, John Diebold; Rift topography linked to magmatism at the intermediate spreading Juan de Fuca Ridge. Geology 2006;; 34 (3): 209–212. doi: https://doi.org/10.1130/G21969.1 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 New seismic observations of crustal structure along the Juan de Fuca Ridge indicate that the axial rift topography reflects magma-induced deformation rather than alternating phases of magmatism and tectonic extension, as previously proposed. Contrary to predictions of the episodic models, crustal magma bodies are imaged beneath portions of all ridge segments surveyed at average depths of 2.1–2.6 km. The shallow rift valley or axial graben associated with each Juan de Fuca segment is ∼50–200 m deep and 1–8 km wide and is well correlated with a magma body in the subsurface. Analysis of graben dimensions (height and width) shows that the axial graben narrows and graben height diminishes where the magma body disappears, rather than deepening and broadening, as expected for rift topography due to tectonic extension. We propose an evolutionary model of axial topography that emphasizes the contribution of dike intrusion to subsidence and fault slip at the seafloor. In this model an evolving axial topography results from feedbacks between the rheology of the crust above a magma sill and dike intrusion, rather than episodic magma delivery from the mantle. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.