Three-dimensional gravity inversion model of the deep crustal structure of the central Drake Passage (Shackleton Fracture Zone and West Scotia Ridge, Antarctica).
Gravity and bathymetric data collected by the Spanish R/V Hespérides 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...
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American Geophysical Union
2003
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Online Access: | http://hdl.handle.net/10261/18990 https://doi.org/10.1029/2002JB001934 |
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ftcsic:oai:digital.csic.es:10261/18990 2024-02-11T09:58:45+01:00 Three-dimensional gravity inversion model of the deep crustal structure of the central Drake Passage (Shackleton Fracture Zone and West Scotia Ridge, Antarctica). Flores-Márquez, E. Leticia Suriñach, Emma Galindo Zaldívar, Jesús Maldonado, Andrés 2003 10752 bytes application/octet-stream http://hdl.handle.net/10261/18990 https://doi.org/10.1029/2002JB001934 en eng American Geophysical Union http://dx.doi.org/10.1029/2002JB001934 Journal of geophysical research 108(9): 1-11 (2003) 0148-0227 http://hdl.handle.net/10261/18990 doi:10.1029/2002JB001934 none Exploration Geophysics Remote sensing Plate tectonics Inverse theory Mathematical Geophysics artículo http://purl.org/coar/resource_type/c_6501 2003 ftcsic https://doi.org/10.1029/2002JB001934 2024-01-16T09:24:33Z Gravity and bathymetric data collected by the Spanish R/V Hespérides 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 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. Peer reviewed Article in Journal/Newspaper Antarc* Antarctica Drake Passage Digital.CSIC (Spanish National Research Council) Drake Passage Shackleton Shackleton Fracture Zone ENVELOPE(-60.000,-60.000,-60.000,-60.000) West Scotia Ridge ENVELOPE(-56.500,-56.500,-56.833,-56.833) Journal of Geophysical Research: Solid Earth 108 B9 |
institution |
Open Polar |
collection |
Digital.CSIC (Spanish National Research Council) |
op_collection_id |
ftcsic |
language |
English |
topic |
Exploration Geophysics Remote sensing Plate tectonics Inverse theory Mathematical Geophysics |
spellingShingle |
Exploration Geophysics Remote sensing Plate tectonics Inverse theory Mathematical Geophysics Flores-Márquez, E. Leticia Suriñach, Emma Galindo Zaldívar, Jesús Maldonado, Andrés Three-dimensional gravity inversion model of the deep crustal structure of the central Drake Passage (Shackleton Fracture Zone and West Scotia Ridge, Antarctica). |
topic_facet |
Exploration Geophysics Remote sensing Plate tectonics Inverse theory Mathematical Geophysics |
description |
Gravity and bathymetric data collected by the Spanish R/V Hespérides 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 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. Peer reviewed |
format |
Article in Journal/Newspaper |
author |
Flores-Márquez, E. Leticia Suriñach, Emma Galindo Zaldívar, Jesús Maldonado, Andrés |
author_facet |
Flores-Márquez, E. Leticia Suriñach, Emma Galindo Zaldívar, Jesús Maldonado, Andrés |
author_sort |
Flores-Márquez, E. Leticia |
title |
Three-dimensional gravity inversion model of the deep crustal structure of the central Drake Passage (Shackleton Fracture Zone and West Scotia Ridge, Antarctica). |
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). |
publisher |
American Geophysical Union |
publishDate |
2003 |
url |
http://hdl.handle.net/10261/18990 https://doi.org/10.1029/2002JB001934 |
long_lat |
ENVELOPE(-60.000,-60.000,-60.000,-60.000) ENVELOPE(-56.500,-56.500,-56.833,-56.833) |
geographic |
Drake Passage Shackleton Shackleton Fracture Zone West Scotia Ridge |
geographic_facet |
Drake Passage Shackleton Shackleton Fracture Zone West Scotia Ridge |
genre |
Antarc* Antarctica Drake Passage |
genre_facet |
Antarc* Antarctica Drake Passage |
op_relation |
http://dx.doi.org/10.1029/2002JB001934 Journal of geophysical research 108(9): 1-11 (2003) 0148-0227 http://hdl.handle.net/10261/18990 doi:10.1029/2002JB001934 |
op_rights |
none |
op_doi |
https://doi.org/10.1029/2002JB001934 |
container_title |
Journal of Geophysical Research: Solid Earth |
container_volume |
108 |
container_issue |
B9 |
_version_ |
1790594491597455360 |