Geomagnetic depth sounding over the central Arctic Islands, Canada
In the spring of 1973, 3 days of simultaneous geomagnetic observations were obtained at six recording sites over the central Arctic Islands. The northern site, Isachsen, displayed the strong suppression of the amplitudes of short-period temporal variations in the vertical component that has been obs...
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crcansciencepubl:10.1139/e80-175 2023-12-17T10:24:22+01:00 Geomagnetic depth sounding over the central Arctic Islands, Canada DeLaurier, Jon M. Niblett, E. R. Plet, F. Camfield, P. A. 1980 http://dx.doi.org/10.1139/e80-175 http://www.nrcresearchpress.com/doi/pdf/10.1139/e80-175 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 17, issue 12, page 1642-1652 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1980 crcansciencepubl https://doi.org/10.1139/e80-175 2023-11-19T13:39:15Z In the spring of 1973, 3 days of simultaneous geomagnetic observations were obtained at six recording sites over the central Arctic Islands. The northern site, Isachsen, displayed the strong suppression of the amplitudes of short-period temporal variations in the vertical component that has been observed at Mould Bay, about 500 km to the southwest. One-dimensional conductivity models suggest high conductivities in the upper crust. Parkinson's arrows for short periods point to the inter-island channels of sea water but for long periods the arrows rotate to point to the deep Arctic Ocean. A large spatial variation of the in-phase correlated Z/H ratios is also observed along a profile across the central Arctic Islands. These ratios peak at the Cameron Island site, which is near the Sverdrup Basin – Franklinian Geosyncline geological boundary. In well-log resistivity data, a conductivity contrast of two orders of magnitude is observed across this margin. Electric currents therefore flow in the conductive sediments of the Sverdrup Basin and in the sea water in the inter-island channels. The electromagnetic response is similar to that near an ocean–continent margin but the peak response occurs "inland" by 300–400 km. Consequently, the margin of the resistive continent is located near the Franklinian – Sverdrup Basin boundary in the central Arctic Islands. Article in Journal/Newspaper Arctic Arctic Ocean Cameron Island Central Arctic Mould Bay sverdrup basin Canadian Science Publishing (via Crossref) Arctic Arctic Ocean Canada Isachsen ENVELOPE(-103.505,-103.505,78.785,78.785) Mould Bay ENVELOPE(-119.436,-119.436,76.197,76.197) Cameron Island ENVELOPE(110.606,110.606,-66.217,-66.217) Canadian Journal of Earth Sciences 17 12 1642 1652 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
English |
topic |
General Earth and Planetary Sciences |
spellingShingle |
General Earth and Planetary Sciences DeLaurier, Jon M. Niblett, E. R. Plet, F. Camfield, P. A. Geomagnetic depth sounding over the central Arctic Islands, Canada |
topic_facet |
General Earth and Planetary Sciences |
description |
In the spring of 1973, 3 days of simultaneous geomagnetic observations were obtained at six recording sites over the central Arctic Islands. The northern site, Isachsen, displayed the strong suppression of the amplitudes of short-period temporal variations in the vertical component that has been observed at Mould Bay, about 500 km to the southwest. One-dimensional conductivity models suggest high conductivities in the upper crust. Parkinson's arrows for short periods point to the inter-island channels of sea water but for long periods the arrows rotate to point to the deep Arctic Ocean. A large spatial variation of the in-phase correlated Z/H ratios is also observed along a profile across the central Arctic Islands. These ratios peak at the Cameron Island site, which is near the Sverdrup Basin – Franklinian Geosyncline geological boundary. In well-log resistivity data, a conductivity contrast of two orders of magnitude is observed across this margin. Electric currents therefore flow in the conductive sediments of the Sverdrup Basin and in the sea water in the inter-island channels. The electromagnetic response is similar to that near an ocean–continent margin but the peak response occurs "inland" by 300–400 km. Consequently, the margin of the resistive continent is located near the Franklinian – Sverdrup Basin boundary in the central Arctic Islands. |
format |
Article in Journal/Newspaper |
author |
DeLaurier, Jon M. Niblett, E. R. Plet, F. Camfield, P. A. |
author_facet |
DeLaurier, Jon M. Niblett, E. R. Plet, F. Camfield, P. A. |
author_sort |
DeLaurier, Jon M. |
title |
Geomagnetic depth sounding over the central Arctic Islands, Canada |
title_short |
Geomagnetic depth sounding over the central Arctic Islands, Canada |
title_full |
Geomagnetic depth sounding over the central Arctic Islands, Canada |
title_fullStr |
Geomagnetic depth sounding over the central Arctic Islands, Canada |
title_full_unstemmed |
Geomagnetic depth sounding over the central Arctic Islands, Canada |
title_sort |
geomagnetic depth sounding over the central arctic islands, canada |
publisher |
Canadian Science Publishing |
publishDate |
1980 |
url |
http://dx.doi.org/10.1139/e80-175 http://www.nrcresearchpress.com/doi/pdf/10.1139/e80-175 |
long_lat |
ENVELOPE(-103.505,-103.505,78.785,78.785) ENVELOPE(-119.436,-119.436,76.197,76.197) ENVELOPE(110.606,110.606,-66.217,-66.217) |
geographic |
Arctic Arctic Ocean Canada Isachsen Mould Bay Cameron Island |
geographic_facet |
Arctic Arctic Ocean Canada Isachsen Mould Bay Cameron Island |
genre |
Arctic Arctic Ocean Cameron Island Central Arctic Mould Bay sverdrup basin |
genre_facet |
Arctic Arctic Ocean Cameron Island Central Arctic Mould Bay sverdrup basin |
op_source |
Canadian Journal of Earth Sciences volume 17, issue 12, page 1642-1652 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e80-175 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
17 |
container_issue |
12 |
container_start_page |
1642 |
op_container_end_page |
1652 |
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1785565691529658368 |