Late Quaternary sedimentation on the Mid-Atlantic Reykjanes Ridge: clay mineral assemblages and depositional environment
Sediment samples from the Mid-Atlantic Reykjanes Ridge (59°N) were taken to get information about sediment genesis and to identify different sources during the late Quaternary. Samples were investigated by X-ray diffraction and grain-size analyses. The clay mineral assemblages in sediments of the Re...
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Language: | English |
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1996
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Online Access: | https://oceanrep.geomar.de/id/eprint/31229/ https://oceanrep.geomar.de/id/eprint/31229/1/art_10.1007_BF02369007.pdf https://doi.org/10.1007/BF02369007 |
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ftoceanrep:oai:oceanrep.geomar.de:31229 2023-05-15T16:51:55+02:00 Late Quaternary sedimentation on the Mid-Atlantic Reykjanes Ridge: clay mineral assemblages and depositional environment Gehrke, B. Lackschewitz, Klas Wallrabe-Adams, H. -J. 1996 text https://oceanrep.geomar.de/id/eprint/31229/ https://oceanrep.geomar.de/id/eprint/31229/1/art_10.1007_BF02369007.pdf https://doi.org/10.1007/BF02369007 en eng Springer https://oceanrep.geomar.de/id/eprint/31229/1/art_10.1007_BF02369007.pdf Gehrke, B., Lackschewitz, K. and Wallrabe-Adams, H. J. (1996) Late Quaternary sedimentation on the Mid-Atlantic Reykjanes Ridge: clay mineral assemblages and depositional environment. Geologische Rundschau, 85 (3). pp. 525-535. DOI 10.1007/BF02369007 <https://doi.org/10.1007/BF02369007>. doi:10.1007/BF02369007 info:eu-repo/semantics/restrictedAccess Article PeerReviewed 1996 ftoceanrep https://doi.org/10.1007/BF02369007 2023-04-07T15:23:20Z Sediment samples from the Mid-Atlantic Reykjanes Ridge (59°N) were taken to get information about sediment genesis and to identify different sources during the late Quaternary. Samples were investigated by X-ray diffraction and grain-size analyses. The clay mineral assemblages in sediments of the Reykjanes Ridge reflect paleoceanographic changes during the late Quaternary. Holocene sediments are characterized by high contents of smectite, mainly of less developed crystallinity. In the spatial distribution of clay minerals high smectite concentrations on the eastern flank and slightly decreasing concentrations on the western flank of the Reykjanes Ridge indicate the action of bottom-water transport. The smectite originates mainly from the volcanogenous Icelandic shelf and reflects the influence of Iceland-Scotland Overflow Water (ISOW). Stratigraphic variability in the clay mineral composition reflects predominantly the influence of different sources, resulting from oceanographic and glacial transport processes. During glacial time sediment transport is due mainly to input by icebergs. Increasing amounts of illite, chlorite, and kaolinite characterize ice-rafted sediments of the “Heinrich layers”. In these sediments smectite crystallinity is well developed. In contrast, several other ice-rafted layers contain smectite with low crystallographic order, similar to smectites of Holocene age. The icelandic source was proved by distinct amounts of basaltic glass in the coarse-grained sediment. At approximately 55 ka increasing amounts of chlorite and kaolinite suggest an enhanced influx of warm North Atlantic surface waters. This hypothesis is supported by a high carbonate shell production at this time. Relative low concentrations and the well-developed crystallinity of smectite minerals characterize the Last Glacial Maximum (LGM; 18–16 ka), indicating a reduced supply of fine icelandic material. Shortly after the LGM, at the beginning of termination IA, a distinct increase in fine-grained quartz (<2µm) and smectite ... Article in Journal/Newspaper Iceland North Atlantic OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) Geologische Rundschau 85 3 525 535 |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Sediment samples from the Mid-Atlantic Reykjanes Ridge (59°N) were taken to get information about sediment genesis and to identify different sources during the late Quaternary. Samples were investigated by X-ray diffraction and grain-size analyses. The clay mineral assemblages in sediments of the Reykjanes Ridge reflect paleoceanographic changes during the late Quaternary. Holocene sediments are characterized by high contents of smectite, mainly of less developed crystallinity. In the spatial distribution of clay minerals high smectite concentrations on the eastern flank and slightly decreasing concentrations on the western flank of the Reykjanes Ridge indicate the action of bottom-water transport. The smectite originates mainly from the volcanogenous Icelandic shelf and reflects the influence of Iceland-Scotland Overflow Water (ISOW). Stratigraphic variability in the clay mineral composition reflects predominantly the influence of different sources, resulting from oceanographic and glacial transport processes. During glacial time sediment transport is due mainly to input by icebergs. Increasing amounts of illite, chlorite, and kaolinite characterize ice-rafted sediments of the “Heinrich layers”. In these sediments smectite crystallinity is well developed. In contrast, several other ice-rafted layers contain smectite with low crystallographic order, similar to smectites of Holocene age. The icelandic source was proved by distinct amounts of basaltic glass in the coarse-grained sediment. At approximately 55 ka increasing amounts of chlorite and kaolinite suggest an enhanced influx of warm North Atlantic surface waters. This hypothesis is supported by a high carbonate shell production at this time. Relative low concentrations and the well-developed crystallinity of smectite minerals characterize the Last Glacial Maximum (LGM; 18–16 ka), indicating a reduced supply of fine icelandic material. Shortly after the LGM, at the beginning of termination IA, a distinct increase in fine-grained quartz (<2µm) and smectite ... |
format |
Article in Journal/Newspaper |
author |
Gehrke, B. Lackschewitz, Klas Wallrabe-Adams, H. -J. |
spellingShingle |
Gehrke, B. Lackschewitz, Klas Wallrabe-Adams, H. -J. Late Quaternary sedimentation on the Mid-Atlantic Reykjanes Ridge: clay mineral assemblages and depositional environment |
author_facet |
Gehrke, B. Lackschewitz, Klas Wallrabe-Adams, H. -J. |
author_sort |
Gehrke, B. |
title |
Late Quaternary sedimentation on the Mid-Atlantic Reykjanes Ridge: clay mineral assemblages and depositional environment |
title_short |
Late Quaternary sedimentation on the Mid-Atlantic Reykjanes Ridge: clay mineral assemblages and depositional environment |
title_full |
Late Quaternary sedimentation on the Mid-Atlantic Reykjanes Ridge: clay mineral assemblages and depositional environment |
title_fullStr |
Late Quaternary sedimentation on the Mid-Atlantic Reykjanes Ridge: clay mineral assemblages and depositional environment |
title_full_unstemmed |
Late Quaternary sedimentation on the Mid-Atlantic Reykjanes Ridge: clay mineral assemblages and depositional environment |
title_sort |
late quaternary sedimentation on the mid-atlantic reykjanes ridge: clay mineral assemblages and depositional environment |
publisher |
Springer |
publishDate |
1996 |
url |
https://oceanrep.geomar.de/id/eprint/31229/ https://oceanrep.geomar.de/id/eprint/31229/1/art_10.1007_BF02369007.pdf https://doi.org/10.1007/BF02369007 |
long_lat |
ENVELOPE(-22.250,-22.250,65.467,65.467) |
geographic |
Reykjanes |
geographic_facet |
Reykjanes |
genre |
Iceland North Atlantic |
genre_facet |
Iceland North Atlantic |
op_relation |
https://oceanrep.geomar.de/id/eprint/31229/1/art_10.1007_BF02369007.pdf Gehrke, B., Lackschewitz, K. and Wallrabe-Adams, H. J. (1996) Late Quaternary sedimentation on the Mid-Atlantic Reykjanes Ridge: clay mineral assemblages and depositional environment. Geologische Rundschau, 85 (3). pp. 525-535. DOI 10.1007/BF02369007 <https://doi.org/10.1007/BF02369007>. doi:10.1007/BF02369007 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1007/BF02369007 |
container_title |
Geologische Rundschau |
container_volume |
85 |
container_issue |
3 |
container_start_page |
525 |
op_container_end_page |
535 |
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1766042055670235136 |