Sedimentation rates and foraminiferal assemblages from ODP Site 162-184
Sedimentological and faunal records from the transitional period marking the onset of widespread northern hemisphere glaciation have been investigated at Ocean Drilling Program Site 984. The late Pliocene interglacial sediments of the northeast Atlantic are carbonate rich and show evidence of vigoro...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.745030 2023-05-15T16:29:59+02:00 Sedimentation rates and foraminiferal assemblages from ODP Site 162-184 Austin, William EN Evans, Jeff MEDIAN LATITUDE: 61.425336 * MEDIAN LONGITUDE: -24.082472 * SOUTH-BOUND LATITUDE: 61.425300 * WEST-BOUND LONGITUDE: -24.082500 * NORTH-BOUND LATITUDE: 61.425600 * EAST-BOUND LONGITUDE: -24.082417 * DATE/TIME START: 1995-07-24T00:00:00 * DATE/TIME END: 1995-07-29T17:42:00 2000-04-11 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.745030 https://doi.org/10.1594/PANGAEA.745030 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.745030 https://doi.org/10.1594/PANGAEA.745030 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Austin, William EN; Evans, Jeff (2000): Benthic foraminifera and sediment grain size variability at intermediate water depths in the Northeast Atlantic during the late Pliocene-early Pleistocene. Marine Geology, 170(3-4), 423-441, https://doi.org/10.1016/S0025-3227(00)00097-9 162-984 162-984B 162-984D COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg162 North Atlantic Ocean Ocean Drilling Program ODP Dataset 2000 ftpangaea https://doi.org/10.1594/PANGAEA.745030 https://doi.org/10.1016/S0025-3227(00)00097-9 2023-01-20T07:31:53Z Sedimentological and faunal records from the transitional period marking the onset of widespread northern hemisphere glaciation have been investigated at Ocean Drilling Program Site 984. The late Pliocene interglacial sediments of the northeast Atlantic are carbonate rich and show evidence of vigorous bottom water circulation at intermediate water depths. Contrasting this, the late Pliocene glacial sediments are characterised by carbonate dissolution and slower bottom current velocities. Weak or "leaky" Norwegian Sea overflows, undersaturated with respect to carbonate, influenced this region during the late Pliocene glacials. The early Pleistocene pattern of intermediate water circulation appears to have changed radically in the northeast Atlantic. At this time, interglacial carbonate values and inferred bottom current velocities are low. This suggests slow-flowing, undersaturated Norwegian Sea water bathing the site. The overflow increased during the early Pleistocene interglacials as the exchange between the Atlantic and Norwegian-Greenland Seas improved. The most significant feature of the early Pleistocene glacials is the increase in inferred bottom current velocity. These changes reflect a switch in deep North Atlantic convection to shallower depths during glacial periods, possibly in a manner similar to the increasing contribution of glacial intermediate water to the North Atlantic during the late Pleistocene glacials. Our results suggest that the late Pleistocene climate variability of the North Atlantic is a pervasive feature of the late Pliocene-early Pleistocene record. Dataset Greenland North Atlantic Northeast Atlantic Norwegian Sea PANGAEA - Data Publisher for Earth & Environmental Science Norwegian Sea Greenland ENVELOPE(-24.082500,-24.082417,61.425600,61.425300) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
162-984 162-984B 162-984D COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg162 North Atlantic Ocean Ocean Drilling Program ODP |
spellingShingle |
162-984 162-984B 162-984D COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg162 North Atlantic Ocean Ocean Drilling Program ODP Austin, William EN Evans, Jeff Sedimentation rates and foraminiferal assemblages from ODP Site 162-184 |
topic_facet |
162-984 162-984B 162-984D COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg162 North Atlantic Ocean Ocean Drilling Program ODP |
description |
Sedimentological and faunal records from the transitional period marking the onset of widespread northern hemisphere glaciation have been investigated at Ocean Drilling Program Site 984. The late Pliocene interglacial sediments of the northeast Atlantic are carbonate rich and show evidence of vigorous bottom water circulation at intermediate water depths. Contrasting this, the late Pliocene glacial sediments are characterised by carbonate dissolution and slower bottom current velocities. Weak or "leaky" Norwegian Sea overflows, undersaturated with respect to carbonate, influenced this region during the late Pliocene glacials. The early Pleistocene pattern of intermediate water circulation appears to have changed radically in the northeast Atlantic. At this time, interglacial carbonate values and inferred bottom current velocities are low. This suggests slow-flowing, undersaturated Norwegian Sea water bathing the site. The overflow increased during the early Pleistocene interglacials as the exchange between the Atlantic and Norwegian-Greenland Seas improved. The most significant feature of the early Pleistocene glacials is the increase in inferred bottom current velocity. These changes reflect a switch in deep North Atlantic convection to shallower depths during glacial periods, possibly in a manner similar to the increasing contribution of glacial intermediate water to the North Atlantic during the late Pleistocene glacials. Our results suggest that the late Pleistocene climate variability of the North Atlantic is a pervasive feature of the late Pliocene-early Pleistocene record. |
format |
Dataset |
author |
Austin, William EN Evans, Jeff |
author_facet |
Austin, William EN Evans, Jeff |
author_sort |
Austin, William EN |
title |
Sedimentation rates and foraminiferal assemblages from ODP Site 162-184 |
title_short |
Sedimentation rates and foraminiferal assemblages from ODP Site 162-184 |
title_full |
Sedimentation rates and foraminiferal assemblages from ODP Site 162-184 |
title_fullStr |
Sedimentation rates and foraminiferal assemblages from ODP Site 162-184 |
title_full_unstemmed |
Sedimentation rates and foraminiferal assemblages from ODP Site 162-184 |
title_sort |
sedimentation rates and foraminiferal assemblages from odp site 162-184 |
publisher |
PANGAEA |
publishDate |
2000 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.745030 https://doi.org/10.1594/PANGAEA.745030 |
op_coverage |
MEDIAN LATITUDE: 61.425336 * MEDIAN LONGITUDE: -24.082472 * SOUTH-BOUND LATITUDE: 61.425300 * WEST-BOUND LONGITUDE: -24.082500 * NORTH-BOUND LATITUDE: 61.425600 * EAST-BOUND LONGITUDE: -24.082417 * DATE/TIME START: 1995-07-24T00:00:00 * DATE/TIME END: 1995-07-29T17:42:00 |
long_lat |
ENVELOPE(-24.082500,-24.082417,61.425600,61.425300) |
geographic |
Norwegian Sea Greenland |
geographic_facet |
Norwegian Sea Greenland |
genre |
Greenland North Atlantic Northeast Atlantic Norwegian Sea |
genre_facet |
Greenland North Atlantic Northeast Atlantic Norwegian Sea |
op_source |
Supplement to: Austin, William EN; Evans, Jeff (2000): Benthic foraminifera and sediment grain size variability at intermediate water depths in the Northeast Atlantic during the late Pliocene-early Pleistocene. Marine Geology, 170(3-4), 423-441, https://doi.org/10.1016/S0025-3227(00)00097-9 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.745030 https://doi.org/10.1594/PANGAEA.745030 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.745030 https://doi.org/10.1016/S0025-3227(00)00097-9 |
_version_ |
1766019696876847104 |