Nannofossil assemblages of mid-Pliocene sediments from the equatorial Atlantic
Downcore cyclic variation in high-resolution nannofossil abundance records from mid-Pliocene equatorial Atlantic ODP Sites 662 and 926 demonstrate the direct response by several Pliocene taxa (notably Discoaster, Sphenolithus and Florisphaera profunda) to orbitally forced climatic variation. In part...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.676965 2024-09-09T19:57:48+00:00 Nannofossil assemblages of mid-Pliocene sediments from the equatorial Atlantic Shackleton, Nicholas J Gibbs, Samantha J Young, Jeremy MEDIAN LATITUDE: 1.803035 * MEDIAN LONGITUDE: -31.219862 * SOUTH-BOUND LATITUDE: -1.390200 * WEST-BOUND LONGITUDE: -42.908400 * NORTH-BOUND LATITUDE: 3.719100 * EAST-BOUND LONGITUDE: -11.739200 * DATE/TIME START: 1986-03-24T03:00:00 * DATE/TIME END: 1994-02-27T16:00:00 2004 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.676965 https://doi.org/10.1594/PANGAEA.676965 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.676965 https://doi.org/10.1594/PANGAEA.676965 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Gibbs, Samantha J; Shackleton, Nicholas J; Young, Jeremy (2004): Orbitally forced climate signals in mid-Pliocene nannofossil assemblages. Marine Micropaleontology, 51(1-2), 39-56, https://doi.org/10.1016/j.marmicro.2003.09.002 108-662A 154-926 154-926A 154-926C COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg108 Leg154 North Atlantic Ocean Ocean Drilling Program ODP South Atlantic Ocean dataset publication series 2004 ftpangaea https://doi.org/10.1594/PANGAEA.67696510.1016/j.marmicro.2003.09.002 2024-08-21T00:02:25Z Downcore cyclic variation in high-resolution nannofossil abundance records from mid-Pliocene equatorial Atlantic ODP Sites 662 and 926 demonstrate the direct response by several Pliocene taxa (notably Discoaster, Sphenolithus and Florisphaera profunda) to orbitally forced climatic variation. In particular, these records display strong obliquity and precessional signals reflecting primarily high latitude, Southern hemisphere changes influencing upwelling intensity and local low-latitude, insolation-driven climatic changes (via the productivity and/or turbidity influence of Amazon-sourced terrigenous material) at Sites 622 and 926 respectively. In seasonal studies of coccolithophorid assemblages, only part of the variation observed can be explained by abiotic processes, so it is perhaps not surprising that in this study few Pliocene nannofossil taxa demonstrate significant correlations with each other or with physical environmental parameters. Only some variance in nannofossil abundances can be explained by the primary controls of temperature and productivity. The rest is attributed to nonlinear responses to climatic changes; biotic processes such as grazing, predation, viral infection and competition, and/or, abiotic factors for which there is no readily available proxy (e.g. salinity). The lack of strong, consistent intra- and inter-relationships of the nannoflora and the environment reflects an ecologically complex, differentiated original community producing a complex integrated signal transmitted into the fossil record. Other/Unknown Material North Atlantic South Atlantic Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-42.908400,-11.739200,3.719100,-1.390200) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
108-662A 154-926 154-926A 154-926C COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg108 Leg154 North Atlantic Ocean Ocean Drilling Program ODP South Atlantic Ocean |
spellingShingle |
108-662A 154-926 154-926A 154-926C COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg108 Leg154 North Atlantic Ocean Ocean Drilling Program ODP South Atlantic Ocean Shackleton, Nicholas J Gibbs, Samantha J Young, Jeremy Nannofossil assemblages of mid-Pliocene sediments from the equatorial Atlantic |
topic_facet |
108-662A 154-926 154-926A 154-926C COMPCORE Composite Core DRILL Drilling/drill rig Joides Resolution Leg108 Leg154 North Atlantic Ocean Ocean Drilling Program ODP South Atlantic Ocean |
description |
Downcore cyclic variation in high-resolution nannofossil abundance records from mid-Pliocene equatorial Atlantic ODP Sites 662 and 926 demonstrate the direct response by several Pliocene taxa (notably Discoaster, Sphenolithus and Florisphaera profunda) to orbitally forced climatic variation. In particular, these records display strong obliquity and precessional signals reflecting primarily high latitude, Southern hemisphere changes influencing upwelling intensity and local low-latitude, insolation-driven climatic changes (via the productivity and/or turbidity influence of Amazon-sourced terrigenous material) at Sites 622 and 926 respectively. In seasonal studies of coccolithophorid assemblages, only part of the variation observed can be explained by abiotic processes, so it is perhaps not surprising that in this study few Pliocene nannofossil taxa demonstrate significant correlations with each other or with physical environmental parameters. Only some variance in nannofossil abundances can be explained by the primary controls of temperature and productivity. The rest is attributed to nonlinear responses to climatic changes; biotic processes such as grazing, predation, viral infection and competition, and/or, abiotic factors for which there is no readily available proxy (e.g. salinity). The lack of strong, consistent intra- and inter-relationships of the nannoflora and the environment reflects an ecologically complex, differentiated original community producing a complex integrated signal transmitted into the fossil record. |
format |
Other/Unknown Material |
author |
Shackleton, Nicholas J Gibbs, Samantha J Young, Jeremy |
author_facet |
Shackleton, Nicholas J Gibbs, Samantha J Young, Jeremy |
author_sort |
Shackleton, Nicholas J |
title |
Nannofossil assemblages of mid-Pliocene sediments from the equatorial Atlantic |
title_short |
Nannofossil assemblages of mid-Pliocene sediments from the equatorial Atlantic |
title_full |
Nannofossil assemblages of mid-Pliocene sediments from the equatorial Atlantic |
title_fullStr |
Nannofossil assemblages of mid-Pliocene sediments from the equatorial Atlantic |
title_full_unstemmed |
Nannofossil assemblages of mid-Pliocene sediments from the equatorial Atlantic |
title_sort |
nannofossil assemblages of mid-pliocene sediments from the equatorial atlantic |
publisher |
PANGAEA |
publishDate |
2004 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.676965 https://doi.org/10.1594/PANGAEA.676965 |
op_coverage |
MEDIAN LATITUDE: 1.803035 * MEDIAN LONGITUDE: -31.219862 * SOUTH-BOUND LATITUDE: -1.390200 * WEST-BOUND LONGITUDE: -42.908400 * NORTH-BOUND LATITUDE: 3.719100 * EAST-BOUND LONGITUDE: -11.739200 * DATE/TIME START: 1986-03-24T03:00:00 * DATE/TIME END: 1994-02-27T16:00:00 |
long_lat |
ENVELOPE(-42.908400,-11.739200,3.719100,-1.390200) |
genre |
North Atlantic South Atlantic Ocean |
genre_facet |
North Atlantic South Atlantic Ocean |
op_source |
Supplement to: Gibbs, Samantha J; Shackleton, Nicholas J; Young, Jeremy (2004): Orbitally forced climate signals in mid-Pliocene nannofossil assemblages. Marine Micropaleontology, 51(1-2), 39-56, https://doi.org/10.1016/j.marmicro.2003.09.002 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.676965 https://doi.org/10.1594/PANGAEA.676965 |
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.67696510.1016/j.marmicro.2003.09.002 |
_version_ |
1809928747526127616 |