Clay mineralogy of late Cenozoic sediments in the CESAR cores, Alpha Ridge, central Arctic Ocean
The clay-sized (< 2 μm) fraction of the silty and arenaceous lutites constituting CESAR cores 14 and 103 (Alpha Ridge, central Arctic Ocean) is composed predominantly of mica (40–60%), with subequal percentages (10–20%) of kaolinite and chlorite and lesser amounts (< 5%) of smectite, quartz, p...
Published in: | Canadian Journal of Earth Sciences |
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Canadian Science Publishing
1987
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Online Access: | http://dx.doi.org/10.1139/e87-152 http://www.nrcresearchpress.com/doi/pdf/10.1139/e87-152 |
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crcansciencepubl:10.1139/e87-152 2024-06-23T07:45:20+00:00 Clay mineralogy of late Cenozoic sediments in the CESAR cores, Alpha Ridge, central Arctic Ocean Dalrymple, Robert W. Maass, Oliver C. 1987 http://dx.doi.org/10.1139/e87-152 http://www.nrcresearchpress.com/doi/pdf/10.1139/e87-152 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 24, issue 8, page 1562-1569 ISSN 0008-4077 1480-3313 journal-article 1987 crcansciencepubl https://doi.org/10.1139/e87-152 2024-06-13T04:10:50Z The clay-sized (< 2 μm) fraction of the silty and arenaceous lutites constituting CESAR cores 14 and 103 (Alpha Ridge, central Arctic Ocean) is composed predominantly of mica (40–60%), with subequal percentages (10–20%) of kaolinite and chlorite and lesser amounts (< 5%) of smectite, quartz, plagioclase, and potassium feldspar. Calcite and dolomite also occur, but only intermittently in the upper 1.2 m; dissolution is probably responsible for their absence in other units. The silty lutites have a constant mineralogy throughout the 4.5 m long (~ 4.25 Ma) section, whereas some of the arenaceous intervals in the upper 2.1 m have markedly higher amounts of kaolinite, calcite, dolomite, and, to a lesser extent, smectite. The silty lutites were most likely derived from the Beaufort Sea shelf during nonglacial periods, whereas the distinctive components in the sandy layers suggest that they were transported from the Canadian Arctic Islands and Greenland by glacial ice. The absence of kaolinite peaks in the lower half of the core implies that the western Arctic Islands were not glaciated prior to 2.1 Ma, a conclusion supporting previous findings that the climate of the Arctic was warmer in the Pliocene. Article in Journal/Newspaper alpha ridge Arctic Arctic Ocean Beaufort Sea Greenland Canadian Science Publishing Alpha Ridge ENVELOPE(-120.000,-120.000,85.500,85.500) Arctic Arctic Ocean Greenland Canadian Journal of Earth Sciences 24 8 1562 1569 |
institution |
Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
The clay-sized (< 2 μm) fraction of the silty and arenaceous lutites constituting CESAR cores 14 and 103 (Alpha Ridge, central Arctic Ocean) is composed predominantly of mica (40–60%), with subequal percentages (10–20%) of kaolinite and chlorite and lesser amounts (< 5%) of smectite, quartz, plagioclase, and potassium feldspar. Calcite and dolomite also occur, but only intermittently in the upper 1.2 m; dissolution is probably responsible for their absence in other units. The silty lutites have a constant mineralogy throughout the 4.5 m long (~ 4.25 Ma) section, whereas some of the arenaceous intervals in the upper 2.1 m have markedly higher amounts of kaolinite, calcite, dolomite, and, to a lesser extent, smectite. The silty lutites were most likely derived from the Beaufort Sea shelf during nonglacial periods, whereas the distinctive components in the sandy layers suggest that they were transported from the Canadian Arctic Islands and Greenland by glacial ice. The absence of kaolinite peaks in the lower half of the core implies that the western Arctic Islands were not glaciated prior to 2.1 Ma, a conclusion supporting previous findings that the climate of the Arctic was warmer in the Pliocene. |
format |
Article in Journal/Newspaper |
author |
Dalrymple, Robert W. Maass, Oliver C. |
spellingShingle |
Dalrymple, Robert W. Maass, Oliver C. Clay mineralogy of late Cenozoic sediments in the CESAR cores, Alpha Ridge, central Arctic Ocean |
author_facet |
Dalrymple, Robert W. Maass, Oliver C. |
author_sort |
Dalrymple, Robert W. |
title |
Clay mineralogy of late Cenozoic sediments in the CESAR cores, Alpha Ridge, central Arctic Ocean |
title_short |
Clay mineralogy of late Cenozoic sediments in the CESAR cores, Alpha Ridge, central Arctic Ocean |
title_full |
Clay mineralogy of late Cenozoic sediments in the CESAR cores, Alpha Ridge, central Arctic Ocean |
title_fullStr |
Clay mineralogy of late Cenozoic sediments in the CESAR cores, Alpha Ridge, central Arctic Ocean |
title_full_unstemmed |
Clay mineralogy of late Cenozoic sediments in the CESAR cores, Alpha Ridge, central Arctic Ocean |
title_sort |
clay mineralogy of late cenozoic sediments in the cesar cores, alpha ridge, central arctic ocean |
publisher |
Canadian Science Publishing |
publishDate |
1987 |
url |
http://dx.doi.org/10.1139/e87-152 http://www.nrcresearchpress.com/doi/pdf/10.1139/e87-152 |
long_lat |
ENVELOPE(-120.000,-120.000,85.500,85.500) |
geographic |
Alpha Ridge Arctic Arctic Ocean Greenland |
geographic_facet |
Alpha Ridge Arctic Arctic Ocean Greenland |
genre |
alpha ridge Arctic Arctic Ocean Beaufort Sea Greenland |
genre_facet |
alpha ridge Arctic Arctic Ocean Beaufort Sea Greenland |
op_source |
Canadian Journal of Earth Sciences volume 24, issue 8, page 1562-1569 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e87-152 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
24 |
container_issue |
8 |
container_start_page |
1562 |
op_container_end_page |
1569 |
_version_ |
1802639198214160384 |