Plate tectonics and the origin of the Juan Fernández Ridge: analysis of bathymetry and magnetic patterns

Juan Fernández Ridge (JFR) is a cα. 800 km long alignment of seamounts and islands which is thought to be fed by a deep mantle plume. JFR includes the Friday and Domingo seamounts in the western active edge close to the active hotspot, and the O'Higgins Seamount and Guyot at the easter...

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Autores principales:	Rodrigo,Cristián, Lara,Luis E
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2014
Materias:	seamounts hotspots magnetic anomalies bathymetry Juan Fernández Ridge
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2014000400015
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spelling	oai:scielo:S0718-560X20140004000152014-12-15Plate tectonics and the origin of the Juan Fernández Ridge: analysis of bathymetry and magnetic patternsRodrigo,CristiánLara,Luis E seamounts hotspots magnetic anomalies bathymetry Juan Fernández Ridge Juan Fernández Ridge (JFR) is a cα. 800 km long alignment of seamounts and islands which is thought to be fed by a deep mantle plume. JFR includes the Friday and Domingo seamounts in the western active edge close to the active hotspot, and the O'Higgins Seamount and Guyot at the eastern limit just in front of the Chile-Perú trench. Recent bathymetric (Global Topography) and magnetic (EMAG-2) datasets were interpreted both qualitatively and quantitatively by means of 3D inverse modeling and 2D direct modeling for geometry and susceptibility, together with an interpretation of the synthetic anomalies related to the classical hypothesis of deep seafloor spreading. Topographic and magnetic patterns are used to understand the tectonic evolution and origin of the JFR, especially in the western segment. Results show a continuous corridor with a base at ~3900 m depth formed by four groups of seamounts/islands with a number of summits. The deep ocean floor is ~22 to ~37 Myr old and is younger to the south of the Challenger Fracture Zone that runs in a SW-NE direction. The magnetic pattern of the western JFR segment, which is different than the eastern one, has no correlation with bathymetry and does not present a common polarity nor fit with magnetic models for isolated bodies. This superposition of magnetic patterns indicates a role of the faults/fractures of the Nazca Plate. Geological evidence supports the hypothesis of a fixed mantle plume for the origin of JFR but our data suggest that tectonic processes play a role, thus fueling the global controversy about these competing processes.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.42 n.4 20142014-10-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2014000400015en10.3856/vol42-issue4-fulltext-15
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	seamounts hotspots magnetic anomalies bathymetry Juan Fernández Ridge
spellingShingle	seamounts hotspots magnetic anomalies bathymetry Juan Fernández Ridge Rodrigo,Cristián Lara,Luis E Plate tectonics and the origin of the Juan Fernández Ridge: analysis of bathymetry and magnetic patterns
description	Juan Fernández Ridge (JFR) is a cα. 800 km long alignment of seamounts and islands which is thought to be fed by a deep mantle plume. JFR includes the Friday and Domingo seamounts in the western active edge close to the active hotspot, and the O'Higgins Seamount and Guyot at the eastern limit just in front of the Chile-Perú trench. Recent bathymetric (Global Topography) and magnetic (EMAG-2) datasets were interpreted both qualitatively and quantitatively by means of 3D inverse modeling and 2D direct modeling for geometry and susceptibility, together with an interpretation of the synthetic anomalies related to the classical hypothesis of deep seafloor spreading. Topographic and magnetic patterns are used to understand the tectonic evolution and origin of the JFR, especially in the western segment. Results show a continuous corridor with a base at ~3900 m depth formed by four groups of seamounts/islands with a number of summits. The deep ocean floor is ~22 to ~37 Myr old and is younger to the south of the Challenger Fracture Zone that runs in a SW-NE direction. The magnetic pattern of the western JFR segment, which is different than the eastern one, has no correlation with bathymetry and does not present a common polarity nor fit with magnetic models for isolated bodies. This superposition of magnetic patterns indicates a role of the faults/fractures of the Nazca Plate. Geological evidence supports the hypothesis of a fixed mantle plume for the origin of JFR but our data suggest that tectonic processes play a role, thus fueling the global controversy about these competing processes.
author	Rodrigo,Cristián Lara,Luis E
author_facet	Rodrigo,Cristián Lara,Luis E
author_sort	Rodrigo,Cristián
title	Plate tectonics and the origin of the Juan Fernández Ridge: analysis of bathymetry and magnetic patterns
title_short	Plate tectonics and the origin of the Juan Fernández Ridge: analysis of bathymetry and magnetic patterns
title_full	Plate tectonics and the origin of the Juan Fernández Ridge: analysis of bathymetry and magnetic patterns
title_fullStr	Plate tectonics and the origin of the Juan Fernández Ridge: analysis of bathymetry and magnetic patterns
title_full_unstemmed	Plate tectonics and the origin of the Juan Fernández Ridge: analysis of bathymetry and magnetic patterns
title_sort	plate tectonics and the origin of the juan fernández ridge: analysis of bathymetry and magnetic patterns
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2014
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2014000400015
work_keys_str_mv	AT rodrigocristian platetectonicsandtheoriginofthejuanfernandezridgeanalysisofbathymetryandmagneticpatterns AT laraluise platetectonicsandtheoriginofthejuanfernandezridgeanalysisofbathymetryandmagneticpatterns
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Plate tectonics and the origin of the Juan Fernández Ridge: analysis of bathymetry and magnetic patterns

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