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| Main Authors: | , , , |
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| Format: | Dataset Open Access |
| Language: | en |
| Published: |
PANGAEA
2002
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| Online Access: | https://doi.org/10.1594/PANGAEA.764310 |
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| _version_ | 1867169038336000000 |
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| author | Giosan, Liviu Flood, Roger D Gruetzner, Jens Mudie, Peta J |
| author_facet | Giosan, Liviu Flood, Roger D Gruetzner, Jens Mudie, Peta J |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | Color variations were interpreted in paleoceanographic terms for the late Pliocene-Pleistocene sediments recovered by ODP Leg 172 on deep-sea drifts at Blake-Bahama Outer Ridge and northeastern Bermuda Rise. The color-derived parameters used in interpretation included predicted carbonate content, terrigenous fluxes, and hematite content. Abundance of Upper Carboniferous spores indicates that the hematite is probably derived from the Permo-Carboniferous red beds of the Canadian Maritimes. In the last 800 kyr sedimentation pattern changes on the Blake-Bahama Outer Ridge were determined by the sediment delivery to the deep basin as well as circulation changes. Sediment delivery increased during glacials (especially during the last 500 kyr and particularly since Stage 6). A fundamental change in the thermohaline circulation occurred at about 500 ka corresponding to the end of the Mid-Pleistocene Transition period at the onset of the predominant 100-kyr climate cyclicity. Sedimentation related to WBUC had intensified at that time and had become more focused at depths below 3000 m. Changes in hematite content and sedimentation rate show a pulse of sediment via the St. Lawrence outlet at the Pliocene-Pleistocene boundary suggesting that a likely change in the hydrography/physiography of the Laurentide Ice Sheet could have been involved in the climatic and ocean circulation changes at that time. |
| format | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_764310 |
| institution | PANGAEA |
| language | en |
| publishDate | 2002 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | (Table 1) Upper Carboniferous spores abundances from ODP Holes 172-1062B, 172-1063A and 172-1063B Giosan, Liviu Flood, Roger D Gruetzner, Jens Mudie, Peta J 172-1062B; 172-1063A; 172-1063B; Age, maximum/old; Age, minimum/young; Apiculatisporis; Blake-Bahama Outer Ridge, North Atlantic Ocean; Color description; Converrucosisporites; Counting, palynology; Densosporites; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Florinites; Joides Resolution; Laevigatosporites; Leg172; Leiotriletes; Lophotriletes; Lycospora; Murospora; Ocean Drilling Program; ODP; Punctatisporites; Sample code/label; Smear slide analysis; Spores indeterminata; Total counts; Triquitrites; Verrucosisporites Color variations were interpreted in paleoceanographic terms for the late Pliocene-Pleistocene sediments recovered by ODP Leg 172 on deep-sea drifts at Blake-Bahama Outer Ridge and northeastern Bermuda Rise. The color-derived parameters used in interpretation included predicted carbonate content, terrigenous fluxes, and hematite content. Abundance of Upper Carboniferous spores indicates that the hematite is probably derived from the Permo-Carboniferous red beds of the Canadian Maritimes. In the last 800 kyr sedimentation pattern changes on the Blake-Bahama Outer Ridge were determined by the sediment delivery to the deep basin as well as circulation changes. Sediment delivery increased during glacials (especially during the last 500 kyr and particularly since Stage 6). A fundamental change in the thermohaline circulation occurred at about 500 ka corresponding to the end of the Mid-Pleistocene Transition period at the onset of the predominant 100-kyr climate cyclicity. Sedimentation related to WBUC had intensified at that time and had become more focused at depths below 3000 m. Changes in hematite content and sedimentation rate show a pulse of sediment via the St. Lawrence outlet at the Pliocene-Pleistocene boundary suggesting that a likely change in the hydrography/physiography of the Laurentide Ice Sheet could have been involved in the climatic and ocean circulation changes at that time. |
| title | (Table 1) Upper Carboniferous spores abundances from ODP Holes 172-1062B, 172-1063A and 172-1063B |
| topic | 172-1062B; 172-1063A; 172-1063B; Age, maximum/old; Age, minimum/young; Apiculatisporis; Blake-Bahama Outer Ridge, North Atlantic Ocean; Color description; Converrucosisporites; Counting, palynology; Densosporites; DRILL; Drilling/drill rig; DSDP/ODP/IODP sample designation; Event label; Florinites; Joides Resolution; Laevigatosporites; Leg172; Leiotriletes; Lophotriletes; Lycospora; Murospora; Ocean Drilling Program; ODP; Punctatisporites; Sample code/label; Smear slide analysis; Spores indeterminata; Total counts; Triquitrites; Verrucosisporites |
| url | https://doi.org/10.1594/PANGAEA.764310 |