Mineralogical and grain size analysis of ODP Hole 119-745B from the Southern Ocean, supplement to: Ehrmann, Werner; Grobe, Hannes (1991): Cyclic sedimentation at sites 745 and 746. In: Barron, J; Larsen, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 119, 225-237
The upper Miocene to Pleistocene sediments recovered at ODP Sites 745 and 746 in the Australian-Antarctic Basin are characterized by cyclic facies changes. Sedimentological investigations of a detailed Quaternary section reveal that facies A is dominated by a high content of siliceous microfossils,...
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1991
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ftdatacite:10.1594/pangaea.587844 2023-05-15T13:40:55+02:00 Mineralogical and grain size analysis of ODP Hole 119-745B from the Southern Ocean, supplement to: Ehrmann, Werner; Grobe, Hannes (1991): Cyclic sedimentation at sites 745 and 746. In: Barron, J; Larsen, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 119, 225-237 Ehrmann, Werner Grobe, Hannes 1991 application/zip https://dx.doi.org/10.1594/pangaea.587844 https://doi.pangaea.de/10.1594/PANGAEA.587844 en eng PANGAEA - Data Publisher for Earth & Environmental Science https://dx.doi.org/10.2973/odp.proc.sr.119.123.1991 Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Drilling/drill rig Leg119 Joides Resolution Ocean Drilling Program ODP Supplementary Collection of Datasets Collection article 1991 ftdatacite https://doi.org/10.1594/pangaea.587844 https://doi.org/10.2973/odp.proc.sr.119.123.1991 2022-02-08T16:24:46Z The upper Miocene to Pleistocene sediments recovered at ODP Sites 745 and 746 in the Australian-Antarctic Basin are characterized by cyclic facies changes. Sedimentological investigations of a detailed Quaternary section reveal that facies A is dominated by a high content of siliceous microfossils, a relatively low terrigenous sediment content, an ice-rafted component, low concentrations of fine sediment particles, and a relatively high smectite content. This facies corresponds to interglacial sedimentary conditions. Facies B, in contrast, is characteristic of glacial conditions and is dominated by a large amount of terrigenous material and a smaller opaline component. There is also a prominent ice-rafted component. The microfossils commonly are reworked and broken. The clay mineral assemblages show higher proportions of glacially derived illite and chlorite. A combination of four different processes, attributed to glacial-interglacial cycles, was responsible for the cyclic facies changes during Quaternary time: transport by gravity, ice, and current and changes in primary productivity. Of great importance was the movement of the grounding line of the ice shelves, which directly influenced the intensity of ice rafting and of gravitational sediment transport to the deep sea. The extension of the ice shelves was also responsible for the generation of cold and erosive Antarctic Bottom Water, which controlled the grain-size distribution, particularly of the fine fraction, in the investigated area. Article in Journal/Newspaper Antarc* Antarctic Ice Shelves Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Antarctic Australian Antarctic Basin ENVELOPE(120.000,120.000,-60.000,-60.000) Australian-Antarctic Basin ENVELOPE(134.115,134.115,-58.800,-58.800) Hannes ENVELOPE(18.064,18.064,69.390,69.390) Southern Ocean |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Drilling/drill rig Leg119 Joides Resolution Ocean Drilling Program ODP |
spellingShingle |
Drilling/drill rig Leg119 Joides Resolution Ocean Drilling Program ODP Ehrmann, Werner Grobe, Hannes Mineralogical and grain size analysis of ODP Hole 119-745B from the Southern Ocean, supplement to: Ehrmann, Werner; Grobe, Hannes (1991): Cyclic sedimentation at sites 745 and 746. In: Barron, J; Larsen, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 119, 225-237 |
topic_facet |
Drilling/drill rig Leg119 Joides Resolution Ocean Drilling Program ODP |
description |
The upper Miocene to Pleistocene sediments recovered at ODP Sites 745 and 746 in the Australian-Antarctic Basin are characterized by cyclic facies changes. Sedimentological investigations of a detailed Quaternary section reveal that facies A is dominated by a high content of siliceous microfossils, a relatively low terrigenous sediment content, an ice-rafted component, low concentrations of fine sediment particles, and a relatively high smectite content. This facies corresponds to interglacial sedimentary conditions. Facies B, in contrast, is characteristic of glacial conditions and is dominated by a large amount of terrigenous material and a smaller opaline component. There is also a prominent ice-rafted component. The microfossils commonly are reworked and broken. The clay mineral assemblages show higher proportions of glacially derived illite and chlorite. A combination of four different processes, attributed to glacial-interglacial cycles, was responsible for the cyclic facies changes during Quaternary time: transport by gravity, ice, and current and changes in primary productivity. Of great importance was the movement of the grounding line of the ice shelves, which directly influenced the intensity of ice rafting and of gravitational sediment transport to the deep sea. The extension of the ice shelves was also responsible for the generation of cold and erosive Antarctic Bottom Water, which controlled the grain-size distribution, particularly of the fine fraction, in the investigated area. |
format |
Article in Journal/Newspaper |
author |
Ehrmann, Werner Grobe, Hannes |
author_facet |
Ehrmann, Werner Grobe, Hannes |
author_sort |
Ehrmann, Werner |
title |
Mineralogical and grain size analysis of ODP Hole 119-745B from the Southern Ocean, supplement to: Ehrmann, Werner; Grobe, Hannes (1991): Cyclic sedimentation at sites 745 and 746. In: Barron, J; Larsen, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 119, 225-237 |
title_short |
Mineralogical and grain size analysis of ODP Hole 119-745B from the Southern Ocean, supplement to: Ehrmann, Werner; Grobe, Hannes (1991): Cyclic sedimentation at sites 745 and 746. In: Barron, J; Larsen, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 119, 225-237 |
title_full |
Mineralogical and grain size analysis of ODP Hole 119-745B from the Southern Ocean, supplement to: Ehrmann, Werner; Grobe, Hannes (1991): Cyclic sedimentation at sites 745 and 746. In: Barron, J; Larsen, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 119, 225-237 |
title_fullStr |
Mineralogical and grain size analysis of ODP Hole 119-745B from the Southern Ocean, supplement to: Ehrmann, Werner; Grobe, Hannes (1991): Cyclic sedimentation at sites 745 and 746. In: Barron, J; Larsen, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 119, 225-237 |
title_full_unstemmed |
Mineralogical and grain size analysis of ODP Hole 119-745B from the Southern Ocean, supplement to: Ehrmann, Werner; Grobe, Hannes (1991): Cyclic sedimentation at sites 745 and 746. In: Barron, J; Larsen, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 119, 225-237 |
title_sort |
mineralogical and grain size analysis of odp hole 119-745b from the southern ocean, supplement to: ehrmann, werner; grobe, hannes (1991): cyclic sedimentation at sites 745 and 746. in: barron, j; larsen, b; et al. (eds.), proceedings of the ocean drilling program, scientific results, college station, tx (ocean drilling program), 119, 225-237 |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
1991 |
url |
https://dx.doi.org/10.1594/pangaea.587844 https://doi.pangaea.de/10.1594/PANGAEA.587844 |
long_lat |
ENVELOPE(120.000,120.000,-60.000,-60.000) ENVELOPE(134.115,134.115,-58.800,-58.800) ENVELOPE(18.064,18.064,69.390,69.390) |
geographic |
Antarctic Australian Antarctic Basin Australian-Antarctic Basin Hannes Southern Ocean |
geographic_facet |
Antarctic Australian Antarctic Basin Australian-Antarctic Basin Hannes Southern Ocean |
genre |
Antarc* Antarctic Ice Shelves Southern Ocean |
genre_facet |
Antarc* Antarctic Ice Shelves Southern Ocean |
op_relation |
https://dx.doi.org/10.2973/odp.proc.sr.119.123.1991 |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.587844 https://doi.org/10.2973/odp.proc.sr.119.123.1991 |
_version_ |
1766143077151408128 |