Magnetic spherules in Arctic Ocean sediments
Five types of spherule were found in Quaternary sediments from the Canada Abyssal Plain. They include: type A spherules composed of magnetite and hematite surrounding metallic iron cores, exsolution blebs, or veinlets (Ni, Fe, Co); type B, of nearly pure homogeneous magnetite; type C, displaying int...
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1979
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crcansciencepubl:10.1139/e79-163 2023-12-17T10:26:07+01:00 Magnetic spherules in Arctic Ocean sediments Bornhold, B. D. Bonardi, M. 1979 http://dx.doi.org/10.1139/e79-163 http://www.nrcresearchpress.com/doi/pdf/10.1139/e79-163 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 16, issue 9, page 1778-1788 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1979 crcansciencepubl https://doi.org/10.1139/e79-163 2023-11-19T13:38:53Z Five types of spherule were found in Quaternary sediments from the Canada Abyssal Plain. They include: type A spherules composed of magnetite and hematite surrounding metallic iron cores, exsolution blebs, or veinlets (Ni, Fe, Co); type B, of nearly pure homogeneous magnetite; type C, displaying intergrowths of magnetite and hematite and containing minor Ti (< 1%); type D, composed predominantly of magnetite with significant amounts of Ti (up to 4.8%); and type E, consisting of ilmenite and rutile with Ti, Si, Fe, Mn, Al, K, and Mg as major elements and Cr, Ca, and Na as minor elements. Ni and Co were detected only in a small metallic veinlet (with Fe) surrounded by magnetite containing significant amounts of Ti.Three possible sources are considered: industrial, volcanic, and extraterrestrial. Industrial input is unlikely in view of the great distances to possible sources and the relatively large size of the particles. The high Ti content of most of the spherules suggests a volcanic origin. The five type B spherules are the only possible candidates for a cosmic origin. Article in Journal/Newspaper Arctic Arctic Ocean Canadian Science Publishing (via Crossref) Arctic Arctic Ocean Canada Canada Abyssal Plain ENVELOPE(-155.211,-155.211,75.707,75.707) Canadian Journal of Earth Sciences 16 9 1778 1788 |
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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 Bornhold, B. D. Bonardi, M. Magnetic spherules in Arctic Ocean sediments |
topic_facet |
General Earth and Planetary Sciences |
description |
Five types of spherule were found in Quaternary sediments from the Canada Abyssal Plain. They include: type A spherules composed of magnetite and hematite surrounding metallic iron cores, exsolution blebs, or veinlets (Ni, Fe, Co); type B, of nearly pure homogeneous magnetite; type C, displaying intergrowths of magnetite and hematite and containing minor Ti (< 1%); type D, composed predominantly of magnetite with significant amounts of Ti (up to 4.8%); and type E, consisting of ilmenite and rutile with Ti, Si, Fe, Mn, Al, K, and Mg as major elements and Cr, Ca, and Na as minor elements. Ni and Co were detected only in a small metallic veinlet (with Fe) surrounded by magnetite containing significant amounts of Ti.Three possible sources are considered: industrial, volcanic, and extraterrestrial. Industrial input is unlikely in view of the great distances to possible sources and the relatively large size of the particles. The high Ti content of most of the spherules suggests a volcanic origin. The five type B spherules are the only possible candidates for a cosmic origin. |
format |
Article in Journal/Newspaper |
author |
Bornhold, B. D. Bonardi, M. |
author_facet |
Bornhold, B. D. Bonardi, M. |
author_sort |
Bornhold, B. D. |
title |
Magnetic spherules in Arctic Ocean sediments |
title_short |
Magnetic spherules in Arctic Ocean sediments |
title_full |
Magnetic spherules in Arctic Ocean sediments |
title_fullStr |
Magnetic spherules in Arctic Ocean sediments |
title_full_unstemmed |
Magnetic spherules in Arctic Ocean sediments |
title_sort |
magnetic spherules in arctic ocean sediments |
publisher |
Canadian Science Publishing |
publishDate |
1979 |
url |
http://dx.doi.org/10.1139/e79-163 http://www.nrcresearchpress.com/doi/pdf/10.1139/e79-163 |
long_lat |
ENVELOPE(-155.211,-155.211,75.707,75.707) |
geographic |
Arctic Arctic Ocean Canada Canada Abyssal Plain |
geographic_facet |
Arctic Arctic Ocean Canada Canada Abyssal Plain |
genre |
Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Ocean |
op_source |
Canadian Journal of Earth Sciences volume 16, issue 9, page 1778-1788 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e79-163 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
16 |
container_issue |
9 |
container_start_page |
1778 |
op_container_end_page |
1788 |
_version_ |
1785577821692755968 |