Regional magnetic anomalies, magnetic units, and crustal structure in the Kenora District of Ontario
Regional magnetic anomalies were smoothed from aeromagnetic maps in a part of the Superior Province of the Canadian Shield (latitudes 48°45′ to 50°00′ N; longitudes 93°30′ to 95°00′ W). It was found that anomaly lows lie over Keewatin greenstone belts, and highs over adjacent granitic areas.Surface...
Published in: | Canadian Journal of Earth Sciences |
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Canadian Science Publishing
1968
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Online Access: | http://dx.doi.org/10.1139/e68-126 http://www.nrcresearchpress.com/doi/pdf/10.1139/e68-126 |
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crcansciencepubl:10.1139/e68-126 2023-12-17T10:32:47+01:00 Regional magnetic anomalies, magnetic units, and crustal structure in the Kenora District of Ontario Hall, Donald H. 1968 http://dx.doi.org/10.1139/e68-126 http://www.nrcresearchpress.com/doi/pdf/10.1139/e68-126 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 5, issue 5, page 1277-1296 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1968 crcansciencepubl https://doi.org/10.1139/e68-126 2023-11-19T13:38:28Z Regional magnetic anomalies were smoothed from aeromagnetic maps in a part of the Superior Province of the Canadian Shield (latitudes 48°45′ to 50°00′ N; longitudes 93°30′ to 95°00′ W). It was found that anomaly lows lie over Keewatin greenstone belts, and highs over adjacent granitic areas.Surface mapping of magnetic susceptibility and NRM was combined with quantitative interpretation of the regional magnetic anomalies. It was found that, when considered regionally, magnetization lies primarily in the granitic bodies, with a continuous distribution from the surface down to the Intermediate (Conrad) discontinuity. Intensity of magnetization increases with depth, and is directed nearly along the direction of the present-day geomagnetic field.As an aid to the interpretation, a method of depth determination for deep crustal magnetic units with sloping sides is introduced, and one for variable intensity of magnetization with depth. Article in Journal/Newspaper Keewatin Canadian Science Publishing (via Crossref) Canadian Journal of Earth Sciences 5 5 1277 1296 |
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Open Polar |
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Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences Hall, Donald H. Regional magnetic anomalies, magnetic units, and crustal structure in the Kenora District of Ontario |
topic_facet |
General Earth and Planetary Sciences |
description |
Regional magnetic anomalies were smoothed from aeromagnetic maps in a part of the Superior Province of the Canadian Shield (latitudes 48°45′ to 50°00′ N; longitudes 93°30′ to 95°00′ W). It was found that anomaly lows lie over Keewatin greenstone belts, and highs over adjacent granitic areas.Surface mapping of magnetic susceptibility and NRM was combined with quantitative interpretation of the regional magnetic anomalies. It was found that, when considered regionally, magnetization lies primarily in the granitic bodies, with a continuous distribution from the surface down to the Intermediate (Conrad) discontinuity. Intensity of magnetization increases with depth, and is directed nearly along the direction of the present-day geomagnetic field.As an aid to the interpretation, a method of depth determination for deep crustal magnetic units with sloping sides is introduced, and one for variable intensity of magnetization with depth. |
format |
Article in Journal/Newspaper |
author |
Hall, Donald H. |
author_facet |
Hall, Donald H. |
author_sort |
Hall, Donald H. |
title |
Regional magnetic anomalies, magnetic units, and crustal structure in the Kenora District of Ontario |
title_short |
Regional magnetic anomalies, magnetic units, and crustal structure in the Kenora District of Ontario |
title_full |
Regional magnetic anomalies, magnetic units, and crustal structure in the Kenora District of Ontario |
title_fullStr |
Regional magnetic anomalies, magnetic units, and crustal structure in the Kenora District of Ontario |
title_full_unstemmed |
Regional magnetic anomalies, magnetic units, and crustal structure in the Kenora District of Ontario |
title_sort |
regional magnetic anomalies, magnetic units, and crustal structure in the kenora district of ontario |
publisher |
Canadian Science Publishing |
publishDate |
1968 |
url |
http://dx.doi.org/10.1139/e68-126 http://www.nrcresearchpress.com/doi/pdf/10.1139/e68-126 |
genre |
Keewatin |
genre_facet |
Keewatin |
op_source |
Canadian Journal of Earth Sciences volume 5, issue 5, page 1277-1296 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e68-126 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
5 |
container_issue |
5 |
container_start_page |
1277 |
op_container_end_page |
1296 |
_version_ |
1785586619852521472 |