Distribution of Quartz in Late Quaternary Atlantic Sediments in Relation to Climate
The distribution of quartz in the surface sediments of the Atlantic Ocean reflects derivation from continents by means of rivers, wind, ice, and coastal erosion. Enrichment of quartz thus supplied has occurred in some deep basins of especially the southern high latitudes from winnowing of finegraine...
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Cambridge University Press (CUP)
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crcambridgeupr:10.1016/0033-5894(79)90008-5 2024-09-09T19:42:58+00:00 Distribution of Quartz in Late Quaternary Atlantic Sediments in Relation to Climate Kolla, Venkatarathnam Biscaye, Pierre E. Hanley, Adele F. 1979 http://dx.doi.org/10.1016/0033-5894(79)90008-5 http://api.elsevier.com/content/article/PII:0033589479900085?httpAccept=text/xml http://api.elsevier.com/content/article/PII:0033589479900085?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400029975 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 11, issue 2, page 261-277 ISSN 0033-5894 1096-0287 journal-article 1979 crcambridgeupr https://doi.org/10.1016/0033-5894(79)90008-5 2024-06-19T04:03:41Z The distribution of quartz in the surface sediments of the Atlantic Ocean reflects derivation from continents by means of rivers, wind, ice, and coastal erosion. Enrichment of quartz thus supplied has occurred in some deep basins of especially the southern high latitudes from winnowing of finegrained clays by bottom currents. Although similar modes of quartz transport may have operated both during the Holocene and the last glacial maximum (18,000 yr B.P.), significant differences in the intensity of transport and in the locii of deposition, which are attributable to climatic variations during these times, exist in some areas of the Atlantic. In Holocene sediments of the eastern equatorial Atlantic, a band of high percent quartz exists directly off the present Saharan Desert and Sahel region and reflects the trade-wind transport of dusts from these arid and semiarid regions. During the last glacial maximum (18,000 yr B.P.), this high quartz band expanded southward by about 8° of latitude. This expansion was caused not only by the southward expansion of aridity and desert dunes but also by the southward migration of the northerly belt of trade winds during the last glaciation. Relatively high abundances and accumulation rates of quartz during the last glaciation suggest higher intensities of trade winds during that time compared to the Holocene. In the North Atlantic, the abundances of quartz in Holocene sediments are high adjacent to Greenland-Iceland and in the areas off Newfoundland-Labrador, and gradually decrease toward the central areas. The polar front and limit of sea-ice melting are at present confined to the northern part of the North Atlantic. The ice-rafting of quartz grains is, therefore, effective in the areas adjacent to Greenland and to some extent off Labrador causing high abundances in these areas. In contrast to this, during the last glaciation, the quartz abundances and accumulation rates are high in the central areas of North Atlantic around 45°N and decrease toward Greenland-Newfoundland. The ... Article in Journal/Newspaper Greenland Iceland Newfoundland North Atlantic Sea ice Cambridge University Press Newfoundland Greenland Quaternary Research 11 2 261 277 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
The distribution of quartz in the surface sediments of the Atlantic Ocean reflects derivation from continents by means of rivers, wind, ice, and coastal erosion. Enrichment of quartz thus supplied has occurred in some deep basins of especially the southern high latitudes from winnowing of finegrained clays by bottom currents. Although similar modes of quartz transport may have operated both during the Holocene and the last glacial maximum (18,000 yr B.P.), significant differences in the intensity of transport and in the locii of deposition, which are attributable to climatic variations during these times, exist in some areas of the Atlantic. In Holocene sediments of the eastern equatorial Atlantic, a band of high percent quartz exists directly off the present Saharan Desert and Sahel region and reflects the trade-wind transport of dusts from these arid and semiarid regions. During the last glacial maximum (18,000 yr B.P.), this high quartz band expanded southward by about 8° of latitude. This expansion was caused not only by the southward expansion of aridity and desert dunes but also by the southward migration of the northerly belt of trade winds during the last glaciation. Relatively high abundances and accumulation rates of quartz during the last glaciation suggest higher intensities of trade winds during that time compared to the Holocene. In the North Atlantic, the abundances of quartz in Holocene sediments are high adjacent to Greenland-Iceland and in the areas off Newfoundland-Labrador, and gradually decrease toward the central areas. The polar front and limit of sea-ice melting are at present confined to the northern part of the North Atlantic. The ice-rafting of quartz grains is, therefore, effective in the areas adjacent to Greenland and to some extent off Labrador causing high abundances in these areas. In contrast to this, during the last glaciation, the quartz abundances and accumulation rates are high in the central areas of North Atlantic around 45°N and decrease toward Greenland-Newfoundland. The ... |
format |
Article in Journal/Newspaper |
author |
Kolla, Venkatarathnam Biscaye, Pierre E. Hanley, Adele F. |
spellingShingle |
Kolla, Venkatarathnam Biscaye, Pierre E. Hanley, Adele F. Distribution of Quartz in Late Quaternary Atlantic Sediments in Relation to Climate |
author_facet |
Kolla, Venkatarathnam Biscaye, Pierre E. Hanley, Adele F. |
author_sort |
Kolla, Venkatarathnam |
title |
Distribution of Quartz in Late Quaternary Atlantic Sediments in Relation to Climate |
title_short |
Distribution of Quartz in Late Quaternary Atlantic Sediments in Relation to Climate |
title_full |
Distribution of Quartz in Late Quaternary Atlantic Sediments in Relation to Climate |
title_fullStr |
Distribution of Quartz in Late Quaternary Atlantic Sediments in Relation to Climate |
title_full_unstemmed |
Distribution of Quartz in Late Quaternary Atlantic Sediments in Relation to Climate |
title_sort |
distribution of quartz in late quaternary atlantic sediments in relation to climate |
publisher |
Cambridge University Press (CUP) |
publishDate |
1979 |
url |
http://dx.doi.org/10.1016/0033-5894(79)90008-5 http://api.elsevier.com/content/article/PII:0033589479900085?httpAccept=text/xml http://api.elsevier.com/content/article/PII:0033589479900085?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033589400029975 |
geographic |
Newfoundland Greenland |
geographic_facet |
Newfoundland Greenland |
genre |
Greenland Iceland Newfoundland North Atlantic Sea ice |
genre_facet |
Greenland Iceland Newfoundland North Atlantic Sea ice |
op_source |
Quaternary Research volume 11, issue 2, page 261-277 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/0033-5894(79)90008-5 |
container_title |
Quaternary Research |
container_volume |
11 |
container_issue |
2 |
container_start_page |
261 |
op_container_end_page |
277 |
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1809912302580793344 |