Origin of the Easter Submarine Alignment: morphology and structural lineaments

The Easter submarine alignment corresponds to a sequence of seamounts and oceanic islands which runs from the Ahu-Umu volcanic fields in the west to its intersection with the Nazca Ridge in the east, with a total length of about 2.900 km and a strike of N85°E. Recent bathymetric compilations that in...

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Autores principales:	Rodrigo,Cristián, Díaz,Juan, González-Fernández,Antonio
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2014
Materias:	seamounts hotspot bathymetry morphology Easter Island Salas y Gómez Island
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2014000400012
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spelling	oai:scielo:S0718-560X20140004000122014-12-15Origin of the Easter Submarine Alignment: morphology and structural lineamentsRodrigo,CristiánDíaz,JuanGonzález-Fernández,Antonio seamounts hotspot bathymetry morphology Easter Island Salas y Gómez Island The Easter submarine alignment corresponds to a sequence of seamounts and oceanic islands which runs from the Ahu-Umu volcanic fields in the west to its intersection with the Nazca Ridge in the east, with a total length of about 2.900 km and a strike of N85°E. Recent bathymetric compilations that include combined satellite derived and shipboard data (Global Topography) and multibeam bathymetric data (from NGDC-NOAA) are interpreted both qualitatively and quantitatively by using a morphological analysis, which was comprised of the determination of bathymetric patterns, trends in lineations and structures; height measurements, computation of basal areas and volumes of seamounts, in order to establish clues on the origin of this seamount chain and to establish relationships with the regional tectonics. In the study region 514 seamounts were counted, of which 334 had a basal area less than the reference seamount (Moai). In general, the largest seamounts (>1000 m in height) tend to align and to have a larger volume, with an elongation of their bases along the seamount chain. On the other hand, smaller seamounts tend to be distributed more randomly with more circular bases. As a consequence of the morphological analysis, the best possible mechanism that explains the origin of the seamount chain is the existence of a localized hotspot to the west of the Salas y Gómez Island. The corresponding plume would contribute additional magmatic material towards the East Pacific Rise through canalizations, whose secondary branches would feed intermediate volcanoes. It is possible that within the Easter Island region there would be another minor contribution through fractures in the crust, due to the crustal weakening that was produced by the Easter Fracture Zone.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=S0718-560X2014000400012en10.3856/vol42-issue4-fulltext-12
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	seamounts hotspot bathymetry morphology Easter Island Salas y Gómez Island
spellingShingle	seamounts hotspot bathymetry morphology Easter Island Salas y Gómez Island Rodrigo,Cristián Díaz,Juan González-Fernández,Antonio Origin of the Easter Submarine Alignment: morphology and structural lineaments
description	The Easter submarine alignment corresponds to a sequence of seamounts and oceanic islands which runs from the Ahu-Umu volcanic fields in the west to its intersection with the Nazca Ridge in the east, with a total length of about 2.900 km and a strike of N85°E. Recent bathymetric compilations that include combined satellite derived and shipboard data (Global Topography) and multibeam bathymetric data (from NGDC-NOAA) are interpreted both qualitatively and quantitatively by using a morphological analysis, which was comprised of the determination of bathymetric patterns, trends in lineations and structures; height measurements, computation of basal areas and volumes of seamounts, in order to establish clues on the origin of this seamount chain and to establish relationships with the regional tectonics. In the study region 514 seamounts were counted, of which 334 had a basal area less than the reference seamount (Moai). In general, the largest seamounts (>1000 m in height) tend to align and to have a larger volume, with an elongation of their bases along the seamount chain. On the other hand, smaller seamounts tend to be distributed more randomly with more circular bases. As a consequence of the morphological analysis, the best possible mechanism that explains the origin of the seamount chain is the existence of a localized hotspot to the west of the Salas y Gómez Island. The corresponding plume would contribute additional magmatic material towards the East Pacific Rise through canalizations, whose secondary branches would feed intermediate volcanoes. It is possible that within the Easter Island region there would be another minor contribution through fractures in the crust, due to the crustal weakening that was produced by the Easter Fracture Zone.
author	Rodrigo,Cristián Díaz,Juan González-Fernández,Antonio
author_facet	Rodrigo,Cristián Díaz,Juan González-Fernández,Antonio
author_sort	Rodrigo,Cristián
title	Origin of the Easter Submarine Alignment: morphology and structural lineaments
title_short	Origin of the Easter Submarine Alignment: morphology and structural lineaments
title_full	Origin of the Easter Submarine Alignment: morphology and structural lineaments
title_fullStr	Origin of the Easter Submarine Alignment: morphology and structural lineaments
title_full_unstemmed	Origin of the Easter Submarine Alignment: morphology and structural lineaments
title_sort	origin of the easter submarine alignment: morphology and structural lineaments
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=S0718-560X2014000400012
work_keys_str_mv	AT rodrigocristian originoftheeastersubmarinealignmentmorphologyandstructurallineaments AT diazjuan originoftheeastersubmarinealignmentmorphologyandstructurallineaments AT gonzalezfernandezantonio originoftheeastersubmarinealignmentmorphologyandstructurallineaments
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Origin of the Easter Submarine Alignment: morphology and structural lineaments

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