Compilation of shipborne magnetic and gravity data images crustal structure of Prydz Bay (East Antarctica)
A magnetic anomaly map and a free air anomaly map of Prydz Bay, of the adjacent slope and over the continental rise area (63°S-69.5°S, 69°E-81°E) were compiled using Russian, Australian, Japanese and other available data (more than 20 000 km in total length). Adjustment of different data sets was pe...
Main Authors: | , , , , |
---|---|
Other Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
1999
|
Subjects: | |
Online Access: | http://hdl.handle.net/2122/1359 |
id |
ftingv:oai:www.earth-prints.org:2122/1359 |
---|---|
record_format |
openpolar |
spelling |
ftingv:oai:www.earth-prints.org:2122/1359 2024-06-09T07:40:26+00:00 Compilation of shipborne magnetic and gravity data images crustal structure of Prydz Bay (East Antarctica) Ishihara, T. Leitchenkov, G. L. Golynsky, A. V. Alyavdin, S. O'Brien, P. E. Ishihara, T.; Geological Survey of Japan, Tsukuba, Ibaraki, Japan Leitchenkov, G. L.; VNIIOkeanologia, St. Petersburg, Russia Golynsky, A. V.; VNIIOkeanologia, St. Petersburg, Russia Alyavdin, S.; Polar Marine Expedition, PMGRE, Lomonosov, Russia O'Brien, P. E.; ustralian Geological Survey Organization, Canberra, Australia Geological Survey of Japan, Tsukuba, Ibaraki, Japan VNIIOkeanologia, St. Petersburg, Russia Polar Marine Expedition, PMGRE, Lomonosov, Russia ustralian Geological Survey Organization, Canberra, Australia 1999-04 8058060 bytes application/pdf http://hdl.handle.net/2122/1359 en eng 2/42 (1999) http://hdl.handle.net/2122/1359 open Prydz Bay shipborne data magnetic anomalies gravity anomalies two-dimensional modelling 04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous 04. Solid Earth::04.05. Geomagnetism::04.05.04. Magnetic anomalies article 1999 ftingv 2024-05-15T08:04:29Z A magnetic anomaly map and a free air anomaly map of Prydz Bay, of the adjacent slope and over the continental rise area (63°S-69.5°S, 69°E-81°E) were compiled using Russian, Australian, Japanese and other available data (more than 20 000 km in total length). Adjustment of different data sets was performed before gridding and making contour maps. Crossover differences of the magnetic data were significantly reduced by removing data segments with short-period time variations, by applying time variation corrections of Mawson Station to Australian and Japanese data, and by giving a constant bias to each trackline. Crossover differences of the gravity data were also substantially reduced by applying a constant bias to each cruise/leg. According to the compiled gravity data, in the western part of Prydz Bay the continent ocean boundary is inferred to be situated around the shelf edge at the seaward end of Prydz Channel, while it is in the continental rise in the eastern part. The gravity data also suggest the presence of sediments in the Prydz Bay basin reaching a thickness of about 8 km and overlying a "granitic" layer; the Moho beneath the basin is located at a depth of about 22 km. According to the magnetic data, highly-magnetized rocks occur at shallow depths northwest of the Prydz Bay basin and other parts of Prydz Bay. JCR Journal open Article in Journal/Newspaper Antarc* Antarctica East Antarctica Prydz Bay Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) East Antarctica Prydz Bay Mawson Station ENVELOPE(62.874,62.874,-67.603,-67.603) Prydz Channel ENVELOPE(73.000,73.000,-67.000,-67.000) |
institution |
Open Polar |
collection |
Earth-Prints (Istituto Nazionale di Geofisica e Vulcanologia) |
op_collection_id |
ftingv |
language |
English |
topic |
Prydz Bay shipborne data magnetic anomalies gravity anomalies two-dimensional modelling 04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous 04. Solid Earth::04.05. Geomagnetism::04.05.04. Magnetic anomalies |
spellingShingle |
Prydz Bay shipborne data magnetic anomalies gravity anomalies two-dimensional modelling 04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous 04. Solid Earth::04.05. Geomagnetism::04.05.04. Magnetic anomalies Ishihara, T. Leitchenkov, G. L. Golynsky, A. V. Alyavdin, S. O'Brien, P. E. Compilation of shipborne magnetic and gravity data images crustal structure of Prydz Bay (East Antarctica) |
topic_facet |
Prydz Bay shipborne data magnetic anomalies gravity anomalies two-dimensional modelling 04. Solid Earth::04.04. Geology::04.04.99. General or miscellaneous 04. Solid Earth::04.05. Geomagnetism::04.05.04. Magnetic anomalies |
description |
A magnetic anomaly map and a free air anomaly map of Prydz Bay, of the adjacent slope and over the continental rise area (63°S-69.5°S, 69°E-81°E) were compiled using Russian, Australian, Japanese and other available data (more than 20 000 km in total length). Adjustment of different data sets was performed before gridding and making contour maps. Crossover differences of the magnetic data were significantly reduced by removing data segments with short-period time variations, by applying time variation corrections of Mawson Station to Australian and Japanese data, and by giving a constant bias to each trackline. Crossover differences of the gravity data were also substantially reduced by applying a constant bias to each cruise/leg. According to the compiled gravity data, in the western part of Prydz Bay the continent ocean boundary is inferred to be situated around the shelf edge at the seaward end of Prydz Channel, while it is in the continental rise in the eastern part. The gravity data also suggest the presence of sediments in the Prydz Bay basin reaching a thickness of about 8 km and overlying a "granitic" layer; the Moho beneath the basin is located at a depth of about 22 km. According to the magnetic data, highly-magnetized rocks occur at shallow depths northwest of the Prydz Bay basin and other parts of Prydz Bay. JCR Journal open |
author2 |
Ishihara, T.; Geological Survey of Japan, Tsukuba, Ibaraki, Japan Leitchenkov, G. L.; VNIIOkeanologia, St. Petersburg, Russia Golynsky, A. V.; VNIIOkeanologia, St. Petersburg, Russia Alyavdin, S.; Polar Marine Expedition, PMGRE, Lomonosov, Russia O'Brien, P. E.; ustralian Geological Survey Organization, Canberra, Australia Geological Survey of Japan, Tsukuba, Ibaraki, Japan VNIIOkeanologia, St. Petersburg, Russia Polar Marine Expedition, PMGRE, Lomonosov, Russia ustralian Geological Survey Organization, Canberra, Australia |
format |
Article in Journal/Newspaper |
author |
Ishihara, T. Leitchenkov, G. L. Golynsky, A. V. Alyavdin, S. O'Brien, P. E. |
author_facet |
Ishihara, T. Leitchenkov, G. L. Golynsky, A. V. Alyavdin, S. O'Brien, P. E. |
author_sort |
Ishihara, T. |
title |
Compilation of shipborne magnetic and gravity data images crustal structure of Prydz Bay (East Antarctica) |
title_short |
Compilation of shipborne magnetic and gravity data images crustal structure of Prydz Bay (East Antarctica) |
title_full |
Compilation of shipborne magnetic and gravity data images crustal structure of Prydz Bay (East Antarctica) |
title_fullStr |
Compilation of shipborne magnetic and gravity data images crustal structure of Prydz Bay (East Antarctica) |
title_full_unstemmed |
Compilation of shipborne magnetic and gravity data images crustal structure of Prydz Bay (East Antarctica) |
title_sort |
compilation of shipborne magnetic and gravity data images crustal structure of prydz bay (east antarctica) |
publishDate |
1999 |
url |
http://hdl.handle.net/2122/1359 |
long_lat |
ENVELOPE(62.874,62.874,-67.603,-67.603) ENVELOPE(73.000,73.000,-67.000,-67.000) |
geographic |
East Antarctica Prydz Bay Mawson Station Prydz Channel |
geographic_facet |
East Antarctica Prydz Bay Mawson Station Prydz Channel |
genre |
Antarc* Antarctica East Antarctica Prydz Bay |
genre_facet |
Antarc* Antarctica East Antarctica Prydz Bay |
op_relation |
2/42 (1999) http://hdl.handle.net/2122/1359 |
op_rights |
open |
_version_ |
1801383842461777920 |