Three-dimensional gravity inversion model of the deep crustal structure of the central drake passage (Shackleton Fracture Zone and West Scotia Ridge, Antarctica)

[1] Gravity and bathymetric data collected by the Spanish R/V Hesperides over the Shackleton Fracture Zone (SFZ) and the West Scotia Ridge (WSR) were used to invert for the three-dimensional (3-D) structure of the deep crust. Data from the Global Gravity Grid and Global Seafloor Topography (GGSFT) w...

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Autores: Flores-Marquez, EL, Surinach, E, Galindo-Zaldivar, J, Maldonado, A
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2003
País:México
Institución:Universidad Nacional Autónoma de México
Repositorio:Sistema de Información de la Facultad de Ciencias, UNAM
OAI Identifier:oai:repositorio.fciencias.unam.mx:11154/2464
Acceso en línea:http://hdl.handle.net/11154/2464
Access Level:acceso abierto
Palabra clave:Geochemistry & Geophysics
three-dimensional deep structure
gravity
global gravity grid
global seafloor topography
numerical inversion
Shackleton Fracture Zone
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spelling Three-dimensional gravity inversion model of the deep crustal structure of the central drake passage (Shackleton Fracture Zone and West Scotia Ridge, Antarctica)Flores-Marquez, ELSurinach, EGalindo-Zaldivar, JMaldonado, AGeochemistry & Geophysicsthree-dimensional deep structuregravityglobal gravity gridglobal seafloor topographynumerical inversionShackleton Fracture Zone[1] Gravity and bathymetric data collected by the Spanish R/V Hesperides over the Shackleton Fracture Zone (SFZ) and the West Scotia Ridge (WSR) were used to invert for the three-dimensional (3-D) structure of the deep crust. Data from the Global Gravity Grid and Global Seafloor Topography (GGSFT) were also employed to enlarge the cruise area. The merged data were analyzed to determine the 3-D deep structure by numerical inversion. Water layer contribution to the gravity anomaly was eliminated, taking into account the bathymetry. Spectral analysis of the reduced data yielded mean crust-mantle interface (CMI) depths of 10.5 +/- 1.2 km. Inversion of the regional anomaly gave a 3-D detailed geometry of the CMI, which generally agrees with the 2-D models established along profiles where gravity data and multichannel seismic lines are available. The WSR shows an asymmetrical structure with a reverse fault located southeastward to the central valley. This fault was developed, probably, as a consequence of the NW-SE compressive deformations, which occurred following the spreading. The 3-D view shows that the SW end of the spreading axis was affected more intensely by the compression. The SFZ represents an active sinistral transpressive fault zone of the Scotia-Antarctica plate boundary and shows crustal thickening related to bathymetric highs. The crustal thinning detected at the intersection with the inactive WSR suggests a complex interaction between these two structures.2011-01-22T10:26:44Z2011-01-22T10:26:44Z2003info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article0148-0227http://hdl.handle.net/11154/2464194410.1029/2002JB009134108reponame:Sistema de Información de la Facultad de Ciencias, UNAMinstname:Universidad Nacional Autónoma de Méxicoinstacron:UNAMenJournal of Geophysical Research-Solid Earthinfo:eu-repo/semantics/openAccessoai:repositorio.fciencias.unam.mx:11154/24642025-09-17T19:21:04Z
dc.title.none.fl_str_mv Three-dimensional gravity inversion model of the deep crustal structure of the central drake passage (Shackleton Fracture Zone and West Scotia Ridge, Antarctica)
title Three-dimensional gravity inversion model of the deep crustal structure of the central drake passage (Shackleton Fracture Zone and West Scotia Ridge, Antarctica)
spellingShingle Three-dimensional gravity inversion model of the deep crustal structure of the central drake passage (Shackleton Fracture Zone and West Scotia Ridge, Antarctica)
Flores-Marquez, EL
Geochemistry & Geophysics
three-dimensional deep structure
gravity
global gravity grid
global seafloor topography
numerical inversion
Shackleton Fracture Zone
title_short Three-dimensional gravity inversion model of the deep crustal structure of the central drake passage (Shackleton Fracture Zone and West Scotia Ridge, Antarctica)
title_full Three-dimensional gravity inversion model of the deep crustal structure of the central drake passage (Shackleton Fracture Zone and West Scotia Ridge, Antarctica)
title_fullStr Three-dimensional gravity inversion model of the deep crustal structure of the central drake passage (Shackleton Fracture Zone and West Scotia Ridge, Antarctica)
title_full_unstemmed Three-dimensional gravity inversion model of the deep crustal structure of the central drake passage (Shackleton Fracture Zone and West Scotia Ridge, Antarctica)
title_sort Three-dimensional gravity inversion model of the deep crustal structure of the central drake passage (Shackleton Fracture Zone and West Scotia Ridge, Antarctica)
dc.creator.none.fl_str_mv Flores-Marquez, EL
Surinach, E
Galindo-Zaldivar, J
Maldonado, A
author Flores-Marquez, EL
author_facet Flores-Marquez, EL
Surinach, E
Galindo-Zaldivar, J
Maldonado, A
author_role author
author2 Surinach, E
Galindo-Zaldivar, J
Maldonado, A
author2_role author
author
author
dc.subject.none.fl_str_mv Geochemistry & Geophysics
three-dimensional deep structure
gravity
global gravity grid
global seafloor topography
numerical inversion
Shackleton Fracture Zone
topic Geochemistry & Geophysics
three-dimensional deep structure
gravity
global gravity grid
global seafloor topography
numerical inversion
Shackleton Fracture Zone
description [1] Gravity and bathymetric data collected by the Spanish R/V Hesperides over the Shackleton Fracture Zone (SFZ) and the West Scotia Ridge (WSR) were used to invert for the three-dimensional (3-D) structure of the deep crust. Data from the Global Gravity Grid and Global Seafloor Topography (GGSFT) were also employed to enlarge the cruise area. The merged data were analyzed to determine the 3-D deep structure by numerical inversion. Water layer contribution to the gravity anomaly was eliminated, taking into account the bathymetry. Spectral analysis of the reduced data yielded mean crust-mantle interface (CMI) depths of 10.5 +/- 1.2 km. Inversion of the regional anomaly gave a 3-D detailed geometry of the CMI, which generally agrees with the 2-D models established along profiles where gravity data and multichannel seismic lines are available. The WSR shows an asymmetrical structure with a reverse fault located southeastward to the central valley. This fault was developed, probably, as a consequence of the NW-SE compressive deformations, which occurred following the spreading. The 3-D view shows that the SW end of the spreading axis was affected more intensely by the compression. The SFZ represents an active sinistral transpressive fault zone of the Scotia-Antarctica plate boundary and shows crustal thickening related to bathymetric highs. The crustal thinning detected at the intersection with the inactive WSR suggests a complex interaction between these two structures.
publishDate 2003
dc.date.none.fl_str_mv 2003
2011-01-22T10:26:44Z
2011-01-22T10:26:44Z
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv 0148-0227
http://hdl.handle.net/11154/2464
1944
10.1029/2002JB009134
identifier_str_mv 0148-0227
1944
10.1029/2002JB009134
url http://hdl.handle.net/11154/2464
dc.language.none.fl_str_mv en
language_invalid_str_mv en
dc.relation.none.fl_str_mv Journal of Geophysical Research-Solid Earth
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.source.none.fl_str_mv 108
reponame:Sistema de Información de la Facultad de Ciencias, UNAM
instname:Universidad Nacional Autónoma de México
instacron:UNAM
instname_str Universidad Nacional Autónoma de México
instacron_str UNAM
institution UNAM
reponame_str Sistema de Información de la Facultad de Ciencias, UNAM
collection Sistema de Información de la Facultad de Ciencias, UNAM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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