Geology, Magnetic Expression, and Structural Control of the Central Somerset Island Kimberlites
The Somerset Island kimberlite field is composed of three diatremes Peuyuk, Korvik, and Selatiavak. The largest diatreme, Peuyuk, an enlarged fissure, is a composite intrusion; three petrographically distinct phases (A, B, and C) being recognized on the basis of oxide mineralogy and the presence or...
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1975
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crcansciencepubl:10.1139/e75-066 2024-09-15T18:36:01+00:00 Geology, Magnetic Expression, and Structural Control of the Central Somerset Island Kimberlites Mitchell, Roger H. 1975 http://dx.doi.org/10.1139/e75-066 http://www.nrcresearchpress.com/doi/pdf/10.1139/e75-066 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 12, issue 5, page 757-764 ISSN 0008-4077 1480-3313 journal-article 1975 crcansciencepubl https://doi.org/10.1139/e75-066 2024-07-25T04:10:06Z The Somerset Island kimberlite field is composed of three diatremes Peuyuk, Korvik, and Selatiavak. The largest diatreme, Peuyuk, an enlarged fissure, is a composite intrusion; three petrographically distinct phases (A, B, and C) being recognized on the basis of oxide mineralogy and the presence or absence of immiscible carbonate: (A) spinel and perovskite with no zonations or reaction rims, no immiscible carbonate, (B) epitaxially zoned chrome spinels, magnetite and perovskite with reaction rims, no immiscible carbonate, (C) oxides as in B, but with no magnetite and abundant immiscible carbonate. Selatiavak and Korvik are each composed of two small oval intrusions and are petrographically similar to Peuyuk C. All the kimberlites are characterized by a positive (500–2000γ) magnetic anomaly. Emplacement of the kimberlites has been controlled by structures in the Precambrian basement gneisses, the diatremes being developed from hidden dikes at depth at points of crustal weakness. Article in Journal/Newspaper Somerset Island Canadian Science Publishing Canadian Journal of Earth Sciences 12 5 757 764 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
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English |
description |
The Somerset Island kimberlite field is composed of three diatremes Peuyuk, Korvik, and Selatiavak. The largest diatreme, Peuyuk, an enlarged fissure, is a composite intrusion; three petrographically distinct phases (A, B, and C) being recognized on the basis of oxide mineralogy and the presence or absence of immiscible carbonate: (A) spinel and perovskite with no zonations or reaction rims, no immiscible carbonate, (B) epitaxially zoned chrome spinels, magnetite and perovskite with reaction rims, no immiscible carbonate, (C) oxides as in B, but with no magnetite and abundant immiscible carbonate. Selatiavak and Korvik are each composed of two small oval intrusions and are petrographically similar to Peuyuk C. All the kimberlites are characterized by a positive (500–2000γ) magnetic anomaly. Emplacement of the kimberlites has been controlled by structures in the Precambrian basement gneisses, the diatremes being developed from hidden dikes at depth at points of crustal weakness. |
format |
Article in Journal/Newspaper |
author |
Mitchell, Roger H. |
spellingShingle |
Mitchell, Roger H. Geology, Magnetic Expression, and Structural Control of the Central Somerset Island Kimberlites |
author_facet |
Mitchell, Roger H. |
author_sort |
Mitchell, Roger H. |
title |
Geology, Magnetic Expression, and Structural Control of the Central Somerset Island Kimberlites |
title_short |
Geology, Magnetic Expression, and Structural Control of the Central Somerset Island Kimberlites |
title_full |
Geology, Magnetic Expression, and Structural Control of the Central Somerset Island Kimberlites |
title_fullStr |
Geology, Magnetic Expression, and Structural Control of the Central Somerset Island Kimberlites |
title_full_unstemmed |
Geology, Magnetic Expression, and Structural Control of the Central Somerset Island Kimberlites |
title_sort |
geology, magnetic expression, and structural control of the central somerset island kimberlites |
publisher |
Canadian Science Publishing |
publishDate |
1975 |
url |
http://dx.doi.org/10.1139/e75-066 http://www.nrcresearchpress.com/doi/pdf/10.1139/e75-066 |
genre |
Somerset Island |
genre_facet |
Somerset Island |
op_source |
Canadian Journal of Earth Sciences volume 12, issue 5, page 757-764 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e75-066 |
container_title |
Canadian Journal of Earth Sciences |
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12 |
container_issue |
5 |
container_start_page |
757 |
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764 |
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1810479207281590272 |