Provenance and sedimentary processes of ice-scoured surficial sediments, Labrador Shelf
Sedimentological and geophysical studies of the surficial geology of the Labrador Shelf reveal evidence of sediment provenance and modern seabed dynamics. Analyses of lithic fragments of grab samples from southern Saglek Bank and Makkovik Bank indicate that a high proportion of the surficial cover i...
Published in: | Canadian Journal of Earth Sciences |
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1985
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Online Access: | http://dx.doi.org/10.1139/e85-109 http://www.nrcresearchpress.com/doi/pdf/10.1139/e85-109 |
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crcansciencepubl:10.1139/e85-109 2023-12-17T10:26:12+01:00 Provenance and sedimentary processes of ice-scoured surficial sediments, Labrador Shelf Gilbert, G. R. Barrie, J. V. 1985 http://dx.doi.org/10.1139/e85-109 http://www.nrcresearchpress.com/doi/pdf/10.1139/e85-109 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 22, issue 7, page 1066-1079 ISSN 0008-4077 1480-3313 General Earth and Planetary Sciences journal-article 1985 crcansciencepubl https://doi.org/10.1139/e85-109 2023-11-19T13:39:03Z Sedimentological and geophysical studies of the surficial geology of the Labrador Shelf reveal evidence of sediment provenance and modern seabed dynamics. Analyses of lithic fragments of grab samples from southern Saglek Bank and Makkovik Bank indicate that a high proportion of the surficial cover is of ice-rafted origin. Fossilferous carbonate fragments of Paleozoic age suggest a northern Greenland or Arctic island provenance. Heavy-mineral analyses reveal minerals common to igneous and high-grade metamorphic rocks. The Precambrian terrains of Labrador are a possible early sediment source, although similar more northerly terrains could be more recent sources.The geologic environments of Saglek and Makkovik banks differ, as shown by sediment textures and the distribution and form of ice scours that are abundant over the Labrador Shelf. The contrasting environments result largely from differing degrees of postglacial sediment reworking, evidenced by mineral hydraulic equivalence of the sand fractions from both banks. Sediments on the Makkovik Bank undergo present-day transport as a result of a strong hydrodynamic regime. The deeper, broader Saglek Bank is a hydrodynamically quiet zone except near the seaward bank margin, where strong sediment reworking by currents has and is presently taking place. Article in Journal/Newspaper Arctic Greenland Makkovik Canadian Science Publishing (via Crossref) Arctic Greenland Makkovik ENVELOPE(-59.178,-59.178,55.087,55.087) Labrador Shelf ENVELOPE(-58.000,-58.000,56.000,56.000) Arctic Island ENVELOPE(-74.766,-74.766,62.234,62.234) Makkovik Bank ENVELOPE(-57.833,-57.833,55.500,55.500) Saglek Bank ENVELOPE(-61.200,-61.200,58.245,58.245) Canadian Journal of Earth Sciences 22 7 1066 1079 |
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 Gilbert, G. R. Barrie, J. V. Provenance and sedimentary processes of ice-scoured surficial sediments, Labrador Shelf |
topic_facet |
General Earth and Planetary Sciences |
description |
Sedimentological and geophysical studies of the surficial geology of the Labrador Shelf reveal evidence of sediment provenance and modern seabed dynamics. Analyses of lithic fragments of grab samples from southern Saglek Bank and Makkovik Bank indicate that a high proportion of the surficial cover is of ice-rafted origin. Fossilferous carbonate fragments of Paleozoic age suggest a northern Greenland or Arctic island provenance. Heavy-mineral analyses reveal minerals common to igneous and high-grade metamorphic rocks. The Precambrian terrains of Labrador are a possible early sediment source, although similar more northerly terrains could be more recent sources.The geologic environments of Saglek and Makkovik banks differ, as shown by sediment textures and the distribution and form of ice scours that are abundant over the Labrador Shelf. The contrasting environments result largely from differing degrees of postglacial sediment reworking, evidenced by mineral hydraulic equivalence of the sand fractions from both banks. Sediments on the Makkovik Bank undergo present-day transport as a result of a strong hydrodynamic regime. The deeper, broader Saglek Bank is a hydrodynamically quiet zone except near the seaward bank margin, where strong sediment reworking by currents has and is presently taking place. |
format |
Article in Journal/Newspaper |
author |
Gilbert, G. R. Barrie, J. V. |
author_facet |
Gilbert, G. R. Barrie, J. V. |
author_sort |
Gilbert, G. R. |
title |
Provenance and sedimentary processes of ice-scoured surficial sediments, Labrador Shelf |
title_short |
Provenance and sedimentary processes of ice-scoured surficial sediments, Labrador Shelf |
title_full |
Provenance and sedimentary processes of ice-scoured surficial sediments, Labrador Shelf |
title_fullStr |
Provenance and sedimentary processes of ice-scoured surficial sediments, Labrador Shelf |
title_full_unstemmed |
Provenance and sedimentary processes of ice-scoured surficial sediments, Labrador Shelf |
title_sort |
provenance and sedimentary processes of ice-scoured surficial sediments, labrador shelf |
publisher |
Canadian Science Publishing |
publishDate |
1985 |
url |
http://dx.doi.org/10.1139/e85-109 http://www.nrcresearchpress.com/doi/pdf/10.1139/e85-109 |
long_lat |
ENVELOPE(-59.178,-59.178,55.087,55.087) ENVELOPE(-58.000,-58.000,56.000,56.000) ENVELOPE(-74.766,-74.766,62.234,62.234) ENVELOPE(-57.833,-57.833,55.500,55.500) ENVELOPE(-61.200,-61.200,58.245,58.245) |
geographic |
Arctic Greenland Makkovik Labrador Shelf Arctic Island Makkovik Bank Saglek Bank |
geographic_facet |
Arctic Greenland Makkovik Labrador Shelf Arctic Island Makkovik Bank Saglek Bank |
genre |
Arctic Greenland Makkovik |
genre_facet |
Arctic Greenland Makkovik |
op_source |
Canadian Journal of Earth Sciences volume 22, issue 7, page 1066-1079 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e85-109 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
22 |
container_issue |
7 |
container_start_page |
1066 |
op_container_end_page |
1079 |
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1785577919689523200 |