Stable carbon and oxygen isotope ratios of foraminifera from DSDP Site 94-606
Stable-isotope analysis of two species of benthic foraminifers (Planulina wuellerstorfi and Globocassidulina subglobosa) and one planktonic species (Globigerina bulloides) from DSDP Site 606 reveals the evolution of late Pliocene climate change. No 'stepwise' increase is evident in the del...
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1987
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.733976 2023-05-15T17:25:27+02:00 Stable carbon and oxygen isotope ratios of foraminifera from DSDP Site 94-606 Keigwin, Lloyd D LATITUDE: 37.338450 * LONGITUDE: -35.500050 * DATE/TIME START: 1983-07-02T00:00:00 * DATE/TIME END: 1983-07-02T00:00:00 * MINIMUM DEPTH, sediment/rock: 60.45 m * MAXIMUM DEPTH, sediment/rock: 164.65 m 1987-02-19 text/tab-separated-values, 1587 data points https://doi.pangaea.de/10.1594/PANGAEA.733976 https://doi.org/10.1594/PANGAEA.733976 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.733976 https://doi.org/10.1594/PANGAEA.733976 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Keigwin, Lloyd D (1987): Pliocene Stable-Isotope Record of Deep Sea Drilling Project Site 606: Sequential Events of 18O Enrichment Beginning at 3.1 Ma. In: Ruddiman, WF; Kidd, RB; Thomas, E; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 94, 911-920, https://doi.org/10.2973/dsdp.proc.94.127.1987 94-606_Site COMPCORE Composite Core Deep Sea Drilling Project DEPTH sediment/rock DSDP Globigerina bulloides δ13C δ18O Globocassidulina subglobosa Glomar Challenger Leg94 Mass spectrometer VG Micromass 602 North Atlantic/FLANK Planulina wuellerstorfi Dataset 1987 ftpangaea https://doi.org/10.1594/PANGAEA.733976 https://doi.org/10.2973/dsdp.proc.94.127.1987 2023-01-20T08:49:43Z Stable-isotope analysis of two species of benthic foraminifers (Planulina wuellerstorfi and Globocassidulina subglobosa) and one planktonic species (Globigerina bulloides) from DSDP Site 606 reveals the evolution of late Pliocene climate change. No 'stepwise' increase is evident in the delta18O record at 3.2 Ma, but events of 18O-enrichment of increasing magnitude occurred at 3.1, 2.7, 2.6, and 2.4 Ma. The two youngest events are correlated with events indicating glaciation at northeast Atlantic DSDP Hole 552A (Shackleton et al., 1984, doi:10.1038/307620a0). The oldest delta18O spike, centered within the Mammoth Paleomagnetic Event, is the most prominent feature of results for the interval between 3 and 4 Ma. This isotope event is interpreted as evidence of 2°C bottom-water cooling combined with minor glaciation. Carbon-isotope results for P. wuellerstorfi indicate that Site 606 has been under the influence of North Atlantic Deep Water for most of the interval from 2 to 4 Ma. A significant change in 'vital effect' on G. subglobosa at 2.4 Ma is evident in the delta13C record. Specimens dating from that time become smaller and less abundant than older specimens, and have delta13C values lowered by as much as lâ. This effect could introduce a significant artifact into data sets where various species are 'corrected' to P. wuellerstorfi. Dataset North Atlantic Deep Water North Atlantic Northeast Atlantic PANGAEA - Data Publisher for Earth & Environmental Science Shackleton ENVELOPE(-35.500050,-35.500050,37.338450,37.338450) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
94-606_Site COMPCORE Composite Core Deep Sea Drilling Project DEPTH sediment/rock DSDP Globigerina bulloides δ13C δ18O Globocassidulina subglobosa Glomar Challenger Leg94 Mass spectrometer VG Micromass 602 North Atlantic/FLANK Planulina wuellerstorfi |
spellingShingle |
94-606_Site COMPCORE Composite Core Deep Sea Drilling Project DEPTH sediment/rock DSDP Globigerina bulloides δ13C δ18O Globocassidulina subglobosa Glomar Challenger Leg94 Mass spectrometer VG Micromass 602 North Atlantic/FLANK Planulina wuellerstorfi Keigwin, Lloyd D Stable carbon and oxygen isotope ratios of foraminifera from DSDP Site 94-606 |
topic_facet |
94-606_Site COMPCORE Composite Core Deep Sea Drilling Project DEPTH sediment/rock DSDP Globigerina bulloides δ13C δ18O Globocassidulina subglobosa Glomar Challenger Leg94 Mass spectrometer VG Micromass 602 North Atlantic/FLANK Planulina wuellerstorfi |
description |
Stable-isotope analysis of two species of benthic foraminifers (Planulina wuellerstorfi and Globocassidulina subglobosa) and one planktonic species (Globigerina bulloides) from DSDP Site 606 reveals the evolution of late Pliocene climate change. No 'stepwise' increase is evident in the delta18O record at 3.2 Ma, but events of 18O-enrichment of increasing magnitude occurred at 3.1, 2.7, 2.6, and 2.4 Ma. The two youngest events are correlated with events indicating glaciation at northeast Atlantic DSDP Hole 552A (Shackleton et al., 1984, doi:10.1038/307620a0). The oldest delta18O spike, centered within the Mammoth Paleomagnetic Event, is the most prominent feature of results for the interval between 3 and 4 Ma. This isotope event is interpreted as evidence of 2°C bottom-water cooling combined with minor glaciation. Carbon-isotope results for P. wuellerstorfi indicate that Site 606 has been under the influence of North Atlantic Deep Water for most of the interval from 2 to 4 Ma. A significant change in 'vital effect' on G. subglobosa at 2.4 Ma is evident in the delta13C record. Specimens dating from that time become smaller and less abundant than older specimens, and have delta13C values lowered by as much as lâ. This effect could introduce a significant artifact into data sets where various species are 'corrected' to P. wuellerstorfi. |
format |
Dataset |
author |
Keigwin, Lloyd D |
author_facet |
Keigwin, Lloyd D |
author_sort |
Keigwin, Lloyd D |
title |
Stable carbon and oxygen isotope ratios of foraminifera from DSDP Site 94-606 |
title_short |
Stable carbon and oxygen isotope ratios of foraminifera from DSDP Site 94-606 |
title_full |
Stable carbon and oxygen isotope ratios of foraminifera from DSDP Site 94-606 |
title_fullStr |
Stable carbon and oxygen isotope ratios of foraminifera from DSDP Site 94-606 |
title_full_unstemmed |
Stable carbon and oxygen isotope ratios of foraminifera from DSDP Site 94-606 |
title_sort |
stable carbon and oxygen isotope ratios of foraminifera from dsdp site 94-606 |
publisher |
PANGAEA |
publishDate |
1987 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.733976 https://doi.org/10.1594/PANGAEA.733976 |
op_coverage |
LATITUDE: 37.338450 * LONGITUDE: -35.500050 * DATE/TIME START: 1983-07-02T00:00:00 * DATE/TIME END: 1983-07-02T00:00:00 * MINIMUM DEPTH, sediment/rock: 60.45 m * MAXIMUM DEPTH, sediment/rock: 164.65 m |
long_lat |
ENVELOPE(-35.500050,-35.500050,37.338450,37.338450) |
geographic |
Shackleton |
geographic_facet |
Shackleton |
genre |
North Atlantic Deep Water North Atlantic Northeast Atlantic |
genre_facet |
North Atlantic Deep Water North Atlantic Northeast Atlantic |
op_source |
Supplement to: Keigwin, Lloyd D (1987): Pliocene Stable-Isotope Record of Deep Sea Drilling Project Site 606: Sequential Events of 18O Enrichment Beginning at 3.1 Ma. In: Ruddiman, WF; Kidd, RB; Thomas, E; et al. (eds.), Initial Reports of the Deep Sea Drilling Project, Washington (U.S. Govt. Printing Office), 94, 911-920, https://doi.org/10.2973/dsdp.proc.94.127.1987 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.733976 https://doi.org/10.1594/PANGAEA.733976 |
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.733976 https://doi.org/10.2973/dsdp.proc.94.127.1987 |
_version_ |
1766116882629263360 |