Gravity mapping in the southern Weddell Sea region, Antarctica (Scale 1:2 000 000)
New maps of free-air and the Bouguer gravity anomalies on the Weddell Sea sector (70-81° S, 6-75° W) of Antarctica are presented. These maps are based on the first computer compilation of available gravity data collected by ''Sevmorgeologia'' in 1976-89 in the southern Weddell Se...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.596360 2023-05-15T13:59:14+02:00 Gravity mapping in the southern Weddell Sea region, Antarctica (Scale 1:2 000 000) Aleshkova, Nadezhda D Golynsky, Alexander V Kurinin, Rem G Mandrikov, V S MEDIAN LATITUDE: -75.500000 * MEDIAN LONGITUDE: -40.500000 * SOUTH-BOUND LATITUDE: -81.000000 * WEST-BOUND LONGITUDE: -75.000000 * NORTH-BOUND LATITUDE: -70.000000 * EAST-BOUND LONGITUDE: -6.000000 * MINIMUM ORDINAL NUMBER: 1 * MAXIMUM ORDINAL NUMBER: 3 2000-10-13 text/tab-separated-values, 9 data points https://doi.pangaea.de/10.1594/PANGAEA.596360 https://doi.org/10.1594/PANGAEA.596360 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.596360 https://doi.org/10.1594/PANGAEA.596360 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Aleshkova, Nadezhda D; Golynsky, Alexander V; Kurinin, Rem G; Mandrikov, V S (2000): Gravity mapping in the southern Weddell Sea region. (Explanatory note for free-air and Bounger anomalie maps). Polarforschung, 67(3), 163-177, hdl:10013/epic.29783.d001 File format File size Geological mapping GEOMAP ORDINAL NUMBER Uniform resource locator/link to raw data file Weddell_Sea_Region_S Weddell Sea Dataset 2000 ftpangaea https://doi.org/10.1594/PANGAEA.596360 2023-01-20T08:36:17Z New maps of free-air and the Bouguer gravity anomalies on the Weddell Sea sector (70-81° S, 6-75° W) of Antarctica are presented. These maps are based on the first computer compilation of available gravity data collected by ''Sevmorgeologia'' in 1976-89 in the southern Weddell Sea and adjacent coasts of western Dronning Maud Land (WDML) and Coats Land. The accomplished gravity studies comprise airborne observations with a line spacing of about 20 km and conventional measurements at over-the-ice points, which were spaced at 10-30 km and supplemented by seismic soundings. Hence, anomalies on the maps represent mainly large-scale and deep crustal features. The dominant feature in free-air gravity map is a large dipolar gravity anomaly stretching along the continental margin. Following the major grain of seabed morphology this shelf-edge/slope anomaly (SESA) is clearly divided into three segments characterized by diverse anomaly amplitudes, wavelengths and trends. They are associated with continental margins of different geotectonic provinces of Antarctica surrounding the Weddell Sea. Apparent distinctions in the SESA signatures are interpreted as the gravity expression of tectonic, deep crustal structure segmentation of the continental margin. The prominent gravity highs (100-140 mGal) of the shelf edge anomaly mapped along WDML are assumed to represent high-density mantle injections intruded into the middle/lower crust during initial rifting of continental breakup. Enlarged wavelengths and diminished amplitudes of the gravity anomaly westwards, along the Weddell Sea embayment (WSE) margin, reflect a widening of the continental slope and a significant increase in thickness of underlying sediment strata. Low amplitude, negative free-air anomalies in the Filchner-Ronne Ice Shelves (FRIS) contrast sharply with the dominating positive anomalies offshore. This indicates a greater sedimentary thickness of the basin in this area. Crustal response to the enlarged sediment load is impressed in mostly positive features of ... Dataset Antarc* Antarctica Dronning Maud Land Ice Shelves Polarforschung Weddell Sea PANGAEA - Data Publisher for Earth & Environmental Science Coats Land ENVELOPE(-27.500,-27.500,-77.000,-77.000) Dronning Maud Land Weddell Weddell Sea ENVELOPE(-75.000000,-6.000000,-70.000000,-81.000000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
File format File size Geological mapping GEOMAP ORDINAL NUMBER Uniform resource locator/link to raw data file Weddell_Sea_Region_S Weddell Sea |
spellingShingle |
File format File size Geological mapping GEOMAP ORDINAL NUMBER Uniform resource locator/link to raw data file Weddell_Sea_Region_S Weddell Sea Aleshkova, Nadezhda D Golynsky, Alexander V Kurinin, Rem G Mandrikov, V S Gravity mapping in the southern Weddell Sea region, Antarctica (Scale 1:2 000 000) |
topic_facet |
File format File size Geological mapping GEOMAP ORDINAL NUMBER Uniform resource locator/link to raw data file Weddell_Sea_Region_S Weddell Sea |
description |
New maps of free-air and the Bouguer gravity anomalies on the Weddell Sea sector (70-81° S, 6-75° W) of Antarctica are presented. These maps are based on the first computer compilation of available gravity data collected by ''Sevmorgeologia'' in 1976-89 in the southern Weddell Sea and adjacent coasts of western Dronning Maud Land (WDML) and Coats Land. The accomplished gravity studies comprise airborne observations with a line spacing of about 20 km and conventional measurements at over-the-ice points, which were spaced at 10-30 km and supplemented by seismic soundings. Hence, anomalies on the maps represent mainly large-scale and deep crustal features. The dominant feature in free-air gravity map is a large dipolar gravity anomaly stretching along the continental margin. Following the major grain of seabed morphology this shelf-edge/slope anomaly (SESA) is clearly divided into three segments characterized by diverse anomaly amplitudes, wavelengths and trends. They are associated with continental margins of different geotectonic provinces of Antarctica surrounding the Weddell Sea. Apparent distinctions in the SESA signatures are interpreted as the gravity expression of tectonic, deep crustal structure segmentation of the continental margin. The prominent gravity highs (100-140 mGal) of the shelf edge anomaly mapped along WDML are assumed to represent high-density mantle injections intruded into the middle/lower crust during initial rifting of continental breakup. Enlarged wavelengths and diminished amplitudes of the gravity anomaly westwards, along the Weddell Sea embayment (WSE) margin, reflect a widening of the continental slope and a significant increase in thickness of underlying sediment strata. Low amplitude, negative free-air anomalies in the Filchner-Ronne Ice Shelves (FRIS) contrast sharply with the dominating positive anomalies offshore. This indicates a greater sedimentary thickness of the basin in this area. Crustal response to the enlarged sediment load is impressed in mostly positive features of ... |
format |
Dataset |
author |
Aleshkova, Nadezhda D Golynsky, Alexander V Kurinin, Rem G Mandrikov, V S |
author_facet |
Aleshkova, Nadezhda D Golynsky, Alexander V Kurinin, Rem G Mandrikov, V S |
author_sort |
Aleshkova, Nadezhda D |
title |
Gravity mapping in the southern Weddell Sea region, Antarctica (Scale 1:2 000 000) |
title_short |
Gravity mapping in the southern Weddell Sea region, Antarctica (Scale 1:2 000 000) |
title_full |
Gravity mapping in the southern Weddell Sea region, Antarctica (Scale 1:2 000 000) |
title_fullStr |
Gravity mapping in the southern Weddell Sea region, Antarctica (Scale 1:2 000 000) |
title_full_unstemmed |
Gravity mapping in the southern Weddell Sea region, Antarctica (Scale 1:2 000 000) |
title_sort |
gravity mapping in the southern weddell sea region, antarctica (scale 1:2 000 000) |
publisher |
PANGAEA |
publishDate |
2000 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.596360 https://doi.org/10.1594/PANGAEA.596360 |
op_coverage |
MEDIAN LATITUDE: -75.500000 * MEDIAN LONGITUDE: -40.500000 * SOUTH-BOUND LATITUDE: -81.000000 * WEST-BOUND LONGITUDE: -75.000000 * NORTH-BOUND LATITUDE: -70.000000 * EAST-BOUND LONGITUDE: -6.000000 * MINIMUM ORDINAL NUMBER: 1 * MAXIMUM ORDINAL NUMBER: 3 |
long_lat |
ENVELOPE(-27.500,-27.500,-77.000,-77.000) ENVELOPE(-75.000000,-6.000000,-70.000000,-81.000000) |
geographic |
Coats Land Dronning Maud Land Weddell Weddell Sea |
geographic_facet |
Coats Land Dronning Maud Land Weddell Weddell Sea |
genre |
Antarc* Antarctica Dronning Maud Land Ice Shelves Polarforschung Weddell Sea |
genre_facet |
Antarc* Antarctica Dronning Maud Land Ice Shelves Polarforschung Weddell Sea |
op_source |
Supplement to: Aleshkova, Nadezhda D; Golynsky, Alexander V; Kurinin, Rem G; Mandrikov, V S (2000): Gravity mapping in the southern Weddell Sea region. (Explanatory note for free-air and Bounger anomalie maps). Polarforschung, 67(3), 163-177, hdl:10013/epic.29783.d001 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.596360 https://doi.org/10.1594/PANGAEA.596360 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.596360 |
_version_ |
1766267752247459840 |