Age models of upper Pliocene samples of the North Atlantic
Abundance variations of six Pliocene species of discoasters have been analyzed over the time interval from 1.89 to 2.95 Ma at five contrasting sites in the North Atlantic: Deep Sea Drilling Project Sites 552 (56°N) and 607 (41°N) and Ocean Drilling Program 658 (20°N), 659 (18°N), and 662 (1°S). A sa...
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1989
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.746213 2024-09-15T18:21:21+00:00 Age models of upper Pliocene samples of the North Atlantic Chepstow-Lusty, Alex J Backman, Jan Shackleton, Nicholas J MEDIAN LATITUDE: 26.452001 * MEDIAN LONGITUDE: -21.294932 * SOUTH-BOUND LATITUDE: -1.390200 * WEST-BOUND LONGITUDE: -32.957300 * NORTH-BOUND LATITUDE: 56.042700 * EAST-BOUND LONGITUDE: -11.739200 * DATE/TIME START: 1981-07-31T00:00:00 * DATE/TIME END: 1986-03-25T07:45:00 1989 application/zip, 6 datasets https://doi.pangaea.de/10.1594/PANGAEA.746213 https://doi.org/10.1594/PANGAEA.746213 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.746213 https://doi.org/10.1594/PANGAEA.746213 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Chepstow-Lusty, Alex J; Backman, Jan; Shackleton, Nicholas J (1989): Comparison of Upper Pliocene discoaster abundance variations from North Atlantic Sites 552, 607, 658, 659, and 662: further evidence for marine plankton responding to orbital forcing. In: Ruddiman, W; Sarnthein, M; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 108, 121-141, https://doi.org/10.2973/odp.proc.sr.108.122.1989 108-658A 108-659A 108-662A 81-552A 94-607A Canarias Sea Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Joides Resolution Leg108 Leg81 Leg94 North Atlantic/FLANK North Atlantic/PLATEAU North Atlantic Ocean Ocean Drilling Program ODP South Atlantic Ocean dataset publication series 1989 ftpangaea https://doi.org/10.1594/PANGAEA.74621310.2973/odp.proc.sr.108.122.1989 2024-08-21T00:02:25Z Abundance variations of six Pliocene species of discoasters have been analyzed over the time interval from 1.89 to 2.95 Ma at five contrasting sites in the North Atlantic: Deep Sea Drilling Project Sites 552 (56°N) and 607 (41°N) and Ocean Drilling Program 658 (20°N), 659 (18°N), and 662 (1°S). A sampling interval equivalent to approximately 3 k.y. was used. Total Discoaster abundance showed a reduction with increasing latitude and from the effects of upwelling. This phenomenon is most obvious in Discoaster brouweri, the only species that survived over the entire time interval studied. Prior to 2.38 Ma, Discoaster pentaradiatus and Discoaster surculus are important components of the Discoaster assemblage: Discoaster pentaradiatus increases slightly with latitude up to 41°N, and its abundance relative to D. brouweri increases up to 56°N; D. surculus increases in abundance with latitude and with upwelling conditions relative to both D. brouweri and D. pentaradiatus and is dominant to the latter species at upwelling Site 658 and at the highest latitude sites. Discoaster asymmetricus and Discoaster tamalis appear to increase in abundance with latitude relative to D. brouweri. Many of the abundance changes observed appear to be connected with the initiation of glaciation in the North Atlantic at 2.4 Ma. The long-term trend of decreasing Discoaster abundance probably reflects the fall of sea-surface temperatures. This trend of cooling is overprinted by short-term variations that are probably associated with orbital forcing. Evidence for the astronomical elements of eccentricity and obliquity periodicities were found at all sites; however, only at Sites 607, 659, and 662 were precessional periodicities detected. Furthermore, only at Site 659 was precession found to be dominant to obliquity. Abundance peaks of individual species were found to cross-correlate between sites. The distinct abundance fluctuations observed especially in the tropics suggest that temperature is not the only factor responsible for this ... Other/Unknown Material North Atlantic South Atlantic Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-32.957300,-11.739200,56.042700,-1.390200) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
108-658A 108-659A 108-662A 81-552A 94-607A Canarias Sea Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Joides Resolution Leg108 Leg81 Leg94 North Atlantic/FLANK North Atlantic/PLATEAU North Atlantic Ocean Ocean Drilling Program ODP South Atlantic Ocean |
spellingShingle |
108-658A 108-659A 108-662A 81-552A 94-607A Canarias Sea Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Joides Resolution Leg108 Leg81 Leg94 North Atlantic/FLANK North Atlantic/PLATEAU North Atlantic Ocean Ocean Drilling Program ODP South Atlantic Ocean Chepstow-Lusty, Alex J Backman, Jan Shackleton, Nicholas J Age models of upper Pliocene samples of the North Atlantic |
topic_facet |
108-658A 108-659A 108-662A 81-552A 94-607A Canarias Sea Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Joides Resolution Leg108 Leg81 Leg94 North Atlantic/FLANK North Atlantic/PLATEAU North Atlantic Ocean Ocean Drilling Program ODP South Atlantic Ocean |
description |
Abundance variations of six Pliocene species of discoasters have been analyzed over the time interval from 1.89 to 2.95 Ma at five contrasting sites in the North Atlantic: Deep Sea Drilling Project Sites 552 (56°N) and 607 (41°N) and Ocean Drilling Program 658 (20°N), 659 (18°N), and 662 (1°S). A sampling interval equivalent to approximately 3 k.y. was used. Total Discoaster abundance showed a reduction with increasing latitude and from the effects of upwelling. This phenomenon is most obvious in Discoaster brouweri, the only species that survived over the entire time interval studied. Prior to 2.38 Ma, Discoaster pentaradiatus and Discoaster surculus are important components of the Discoaster assemblage: Discoaster pentaradiatus increases slightly with latitude up to 41°N, and its abundance relative to D. brouweri increases up to 56°N; D. surculus increases in abundance with latitude and with upwelling conditions relative to both D. brouweri and D. pentaradiatus and is dominant to the latter species at upwelling Site 658 and at the highest latitude sites. Discoaster asymmetricus and Discoaster tamalis appear to increase in abundance with latitude relative to D. brouweri. Many of the abundance changes observed appear to be connected with the initiation of glaciation in the North Atlantic at 2.4 Ma. The long-term trend of decreasing Discoaster abundance probably reflects the fall of sea-surface temperatures. This trend of cooling is overprinted by short-term variations that are probably associated with orbital forcing. Evidence for the astronomical elements of eccentricity and obliquity periodicities were found at all sites; however, only at Sites 607, 659, and 662 were precessional periodicities detected. Furthermore, only at Site 659 was precession found to be dominant to obliquity. Abundance peaks of individual species were found to cross-correlate between sites. The distinct abundance fluctuations observed especially in the tropics suggest that temperature is not the only factor responsible for this ... |
format |
Other/Unknown Material |
author |
Chepstow-Lusty, Alex J Backman, Jan Shackleton, Nicholas J |
author_facet |
Chepstow-Lusty, Alex J Backman, Jan Shackleton, Nicholas J |
author_sort |
Chepstow-Lusty, Alex J |
title |
Age models of upper Pliocene samples of the North Atlantic |
title_short |
Age models of upper Pliocene samples of the North Atlantic |
title_full |
Age models of upper Pliocene samples of the North Atlantic |
title_fullStr |
Age models of upper Pliocene samples of the North Atlantic |
title_full_unstemmed |
Age models of upper Pliocene samples of the North Atlantic |
title_sort |
age models of upper pliocene samples of the north atlantic |
publisher |
PANGAEA |
publishDate |
1989 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.746213 https://doi.org/10.1594/PANGAEA.746213 |
op_coverage |
MEDIAN LATITUDE: 26.452001 * MEDIAN LONGITUDE: -21.294932 * SOUTH-BOUND LATITUDE: -1.390200 * WEST-BOUND LONGITUDE: -32.957300 * NORTH-BOUND LATITUDE: 56.042700 * EAST-BOUND LONGITUDE: -11.739200 * DATE/TIME START: 1981-07-31T00:00:00 * DATE/TIME END: 1986-03-25T07:45:00 |
long_lat |
ENVELOPE(-32.957300,-11.739200,56.042700,-1.390200) |
genre |
North Atlantic South Atlantic Ocean |
genre_facet |
North Atlantic South Atlantic Ocean |
op_source |
Supplement to: Chepstow-Lusty, Alex J; Backman, Jan; Shackleton, Nicholas J (1989): Comparison of Upper Pliocene discoaster abundance variations from North Atlantic Sites 552, 607, 658, 659, and 662: further evidence for marine plankton responding to orbital forcing. In: Ruddiman, W; Sarnthein, M; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 108, 121-141, https://doi.org/10.2973/odp.proc.sr.108.122.1989 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.746213 https://doi.org/10.1594/PANGAEA.746213 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1594/PANGAEA.74621310.2973/odp.proc.sr.108.122.1989 |
_version_ |
1810459879887863808 |