Late quaternary spatial and temporal changes in clay- and silt-size mineral assemblages of fiord and shelf cores, western Baffin Bay, northwest North Atlantic
Clay- and silt-size mineral assemblages are described from eight piston cores from the fiords and shelf on the western margin of Baffin Bay, Arctic Canada. Radiocarbon dates indicate that all the cores extend back in time to the last local glacial/interglacial transition (i.e. 8–10 ka); four extend...
Published in: | Continental Shelf Research |
---|---|
Main Authors: | , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Elsevier
1989
|
Subjects: | |
Online Access: | https://oceanrep.geomar.de/id/eprint/32000/ https://oceanrep.geomar.de/id/eprint/32000/1/1-s2.0-0278434389900095-main.pdf https://doi.org/10.1016/0278-4343(89)90009-5 |
id |
ftoceanrep:oai:oceanrep.geomar.de:32000 |
---|---|
record_format |
openpolar |
spelling |
ftoceanrep:oai:oceanrep.geomar.de:32000 2023-05-15T14:59:25+02:00 Late quaternary spatial and temporal changes in clay- and silt-size mineral assemblages of fiord and shelf cores, western Baffin Bay, northwest North Atlantic Andrews, John T. Geirsdottir, Aslaug Jennings, Anne E. 1989 text https://oceanrep.geomar.de/id/eprint/32000/ https://oceanrep.geomar.de/id/eprint/32000/1/1-s2.0-0278434389900095-main.pdf https://doi.org/10.1016/0278-4343(89)90009-5 en eng Elsevier https://oceanrep.geomar.de/id/eprint/32000/1/1-s2.0-0278434389900095-main.pdf Andrews, J. T., Geirsdottir, A. and Jennings, A. E. (1989) Late quaternary spatial and temporal changes in clay- and silt-size mineral assemblages of fiord and shelf cores, western Baffin Bay, northwest North Atlantic. Continental Shelf Research, 9 (5). pp. 445-463. DOI 10.1016/0278-4343(89)90009-5 <https://doi.org/10.1016/0278-4343%2889%2990009-5>. doi:10.1016/0278-4343(89)90009-5 Article PeerReviewed 1989 ftoceanrep https://doi.org/10.1016/0278-4343(89)90009-5 2023-04-07T15:24:50Z Clay- and silt-size mineral assemblages are described from eight piston cores from the fiords and shelf on the western margin of Baffin Bay, Arctic Canada. Radiocarbon dates indicate that all the cores extend back in time to the last local glacial/interglacial transition (i.e. 8–10 ka); four extend back to between 10 and 12 ka, and HU77-021-156, located on the Southeast Baffin Island shelf, includes the entire late Foxe glacial stage. Silt- and clay-size particles constitute ca 40 and 55%, respectively, by weight of the bulk sediment. The clay-size fraction is dominated by mica; feldspars and quartz are the main constituents of the silt fraction. The fiord sediments are mainly composed of local mineralogies, but on the shelf, and at times in the fiords, exotic mineral species occur. The most important of these are detrital carbonates, derived from erosion of the Paleozoic basins in Arctic Canada and/or northwest Greenland. Both calcite and dolomite occur; calcite is the major carbonate mineral in the “southern” cores, whereas dolomite is the most abundant in cores north of 66°N. Higher inputs of carbonate species occur during regional deglaciation, 7–10 ka, and during the last 5 ka (probably reflecting increased iceberg production from northwest Greenland). Thus variations in the precentages of the carbonate minerals indicate significant shifts in Late Quaternary glacial-sediment source areas and oceanographic regimes. Article in Journal/Newspaper Arctic Baffin Bay Baffin Bay Baffin Island Baffin Greenland Iceberg* North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Arctic Baffin Bay Baffin Island Canada Greenland Continental Shelf Research 9 5 445 463 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Clay- and silt-size mineral assemblages are described from eight piston cores from the fiords and shelf on the western margin of Baffin Bay, Arctic Canada. Radiocarbon dates indicate that all the cores extend back in time to the last local glacial/interglacial transition (i.e. 8–10 ka); four extend back to between 10 and 12 ka, and HU77-021-156, located on the Southeast Baffin Island shelf, includes the entire late Foxe glacial stage. Silt- and clay-size particles constitute ca 40 and 55%, respectively, by weight of the bulk sediment. The clay-size fraction is dominated by mica; feldspars and quartz are the main constituents of the silt fraction. The fiord sediments are mainly composed of local mineralogies, but on the shelf, and at times in the fiords, exotic mineral species occur. The most important of these are detrital carbonates, derived from erosion of the Paleozoic basins in Arctic Canada and/or northwest Greenland. Both calcite and dolomite occur; calcite is the major carbonate mineral in the “southern” cores, whereas dolomite is the most abundant in cores north of 66°N. Higher inputs of carbonate species occur during regional deglaciation, 7–10 ka, and during the last 5 ka (probably reflecting increased iceberg production from northwest Greenland). Thus variations in the precentages of the carbonate minerals indicate significant shifts in Late Quaternary glacial-sediment source areas and oceanographic regimes. |
format |
Article in Journal/Newspaper |
author |
Andrews, John T. Geirsdottir, Aslaug Jennings, Anne E. |
spellingShingle |
Andrews, John T. Geirsdottir, Aslaug Jennings, Anne E. Late quaternary spatial and temporal changes in clay- and silt-size mineral assemblages of fiord and shelf cores, western Baffin Bay, northwest North Atlantic |
author_facet |
Andrews, John T. Geirsdottir, Aslaug Jennings, Anne E. |
author_sort |
Andrews, John T. |
title |
Late quaternary spatial and temporal changes in clay- and silt-size mineral assemblages of fiord and shelf cores, western Baffin Bay, northwest North Atlantic |
title_short |
Late quaternary spatial and temporal changes in clay- and silt-size mineral assemblages of fiord and shelf cores, western Baffin Bay, northwest North Atlantic |
title_full |
Late quaternary spatial and temporal changes in clay- and silt-size mineral assemblages of fiord and shelf cores, western Baffin Bay, northwest North Atlantic |
title_fullStr |
Late quaternary spatial and temporal changes in clay- and silt-size mineral assemblages of fiord and shelf cores, western Baffin Bay, northwest North Atlantic |
title_full_unstemmed |
Late quaternary spatial and temporal changes in clay- and silt-size mineral assemblages of fiord and shelf cores, western Baffin Bay, northwest North Atlantic |
title_sort |
late quaternary spatial and temporal changes in clay- and silt-size mineral assemblages of fiord and shelf cores, western baffin bay, northwest north atlantic |
publisher |
Elsevier |
publishDate |
1989 |
url |
https://oceanrep.geomar.de/id/eprint/32000/ https://oceanrep.geomar.de/id/eprint/32000/1/1-s2.0-0278434389900095-main.pdf https://doi.org/10.1016/0278-4343(89)90009-5 |
geographic |
Arctic Baffin Bay Baffin Island Canada Greenland |
geographic_facet |
Arctic Baffin Bay Baffin Island Canada Greenland |
genre |
Arctic Baffin Bay Baffin Bay Baffin Island Baffin Greenland Iceberg* North Atlantic |
genre_facet |
Arctic Baffin Bay Baffin Bay Baffin Island Baffin Greenland Iceberg* North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/32000/1/1-s2.0-0278434389900095-main.pdf Andrews, J. T., Geirsdottir, A. and Jennings, A. E. (1989) Late quaternary spatial and temporal changes in clay- and silt-size mineral assemblages of fiord and shelf cores, western Baffin Bay, northwest North Atlantic. Continental Shelf Research, 9 (5). pp. 445-463. DOI 10.1016/0278-4343(89)90009-5 <https://doi.org/10.1016/0278-4343%2889%2990009-5>. doi:10.1016/0278-4343(89)90009-5 |
op_doi |
https://doi.org/10.1016/0278-4343(89)90009-5 |
container_title |
Continental Shelf Research |
container_volume |
9 |
container_issue |
5 |
container_start_page |
445 |
op_container_end_page |
463 |
_version_ |
1766331530387390464 |