Calculation of paleoproductivity during the Eocene-Oligocene transition of ODP Site 113-689
High-resolution records of carbon and oxygen isotopes and benthic foraminiferal accumulation rates for the Eocene-Oligocene section at Ocean Drilling Program Site 689 (Maud Rise, Weddell Sea; paleodepth about 1500 m) were used to infer variations in paleoproductivity in relation to changes in climat...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.712516 2024-09-15T17:48:04+00:00 Calculation of paleoproductivity during the Eocene-Oligocene transition of ODP Site 113-689 Diester-Haass, Lieselotte Zahn, Rainer LATITUDE: -64.517000 * LONGITUDE: 3.100150 * DATE/TIME START: 1987-01-15T00:00:00 * DATE/TIME END: 1987-01-19T00:00:00 * MINIMUM DEPTH, sediment/rock: 74.48 m * MAXIMUM DEPTH, sediment/rock: 182.82 m 1996 text/tab-separated-values, 1748 data points https://doi.pangaea.de/10.1594/PANGAEA.712516 https://doi.org/10.1594/PANGAEA.712516 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.712516 https://doi.org/10.1594/PANGAEA.712516 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Diester-Haass, Lieselotte; Zahn, Rainer (1996): Eocene-Oligocene transition in the Southern Ocean: History of water mass circulation and biological productivity. Geology, 24(2), 163-166, https://doi.org/10.1130/0091-7613(1996)024%3C0163:EOTITS%3E2.3.CO;2 113-689 Accumulation rate mass Calculated Calculated (Herguera and Berger 1991) COMPCORE Composite Core Counting >150 µm fraction DEPTH sediment/rock Foraminifera benthic flux Joides Resolution Leg113 Ocean Drilling Program ODP Paleoproductivity as carbon South Atlantic Ocean dataset 1996 ftpangaea https://doi.org/10.1594/PANGAEA.71251610.1130/0091-7613(1996)024%3C0163:EOTITS%3E2.3.CO;2 2024-07-24T02:31:30Z High-resolution records of carbon and oxygen isotopes and benthic foraminiferal accumulation rates for the Eocene-Oligocene section at Ocean Drilling Program Site 689 (Maud Rise, Weddell Sea; paleodepth about 1500 m) were used to infer variations in paleoproductivity in relation to changes in climate and ventilation of the deeper-water column. The benthic foraminiferal abundance and isotope records show short-term fluctuations at periodicities of 100 and 400 ka, implying orbitally driven climatic variations. Both records suggest that intermediate-depth water chemistry and primary productivity changed in response to climate. During the Eocene, productivity increased during cold periods and during cold-to-warm transitions, possibly as a result of increased upwelling of nutrient-rich waters. In the Oligocene, in contrast, productivity maxima occurred during intervals of low delta18O values (presumably warmer periods), when a proto–polar front moved to the south of the location of Site 689. This profound transition in climate-productivity patterns occurred around 37 Ma, coeval with rapid changes toward increasing variability of the oxygen and carbon isotope and benthic abundance records and toward larger-amplitude delta18O fluctuations. Therefore, we infer that, at this time, temperature fluctuations increased and a proto–polar front formed in conjunction with the first distinct pulsations in size of the Antarctic ice sheet. We speculate that this major change might have resulted from an initial opening of the Drake Passage at 37 Ma, at least for surface- and intermediate-water circulation. Dataset Antarc* Antarctic Drake Passage Ice Sheet South Atlantic Ocean Weddell Sea PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(3.100150,3.100150,-64.517000,-64.517000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
113-689 Accumulation rate mass Calculated Calculated (Herguera and Berger 1991) COMPCORE Composite Core Counting >150 µm fraction DEPTH sediment/rock Foraminifera benthic flux Joides Resolution Leg113 Ocean Drilling Program ODP Paleoproductivity as carbon South Atlantic Ocean |
spellingShingle |
113-689 Accumulation rate mass Calculated Calculated (Herguera and Berger 1991) COMPCORE Composite Core Counting >150 µm fraction DEPTH sediment/rock Foraminifera benthic flux Joides Resolution Leg113 Ocean Drilling Program ODP Paleoproductivity as carbon South Atlantic Ocean Diester-Haass, Lieselotte Zahn, Rainer Calculation of paleoproductivity during the Eocene-Oligocene transition of ODP Site 113-689 |
topic_facet |
113-689 Accumulation rate mass Calculated Calculated (Herguera and Berger 1991) COMPCORE Composite Core Counting >150 µm fraction DEPTH sediment/rock Foraminifera benthic flux Joides Resolution Leg113 Ocean Drilling Program ODP Paleoproductivity as carbon South Atlantic Ocean |
description |
High-resolution records of carbon and oxygen isotopes and benthic foraminiferal accumulation rates for the Eocene-Oligocene section at Ocean Drilling Program Site 689 (Maud Rise, Weddell Sea; paleodepth about 1500 m) were used to infer variations in paleoproductivity in relation to changes in climate and ventilation of the deeper-water column. The benthic foraminiferal abundance and isotope records show short-term fluctuations at periodicities of 100 and 400 ka, implying orbitally driven climatic variations. Both records suggest that intermediate-depth water chemistry and primary productivity changed in response to climate. During the Eocene, productivity increased during cold periods and during cold-to-warm transitions, possibly as a result of increased upwelling of nutrient-rich waters. In the Oligocene, in contrast, productivity maxima occurred during intervals of low delta18O values (presumably warmer periods), when a proto–polar front moved to the south of the location of Site 689. This profound transition in climate-productivity patterns occurred around 37 Ma, coeval with rapid changes toward increasing variability of the oxygen and carbon isotope and benthic abundance records and toward larger-amplitude delta18O fluctuations. Therefore, we infer that, at this time, temperature fluctuations increased and a proto–polar front formed in conjunction with the first distinct pulsations in size of the Antarctic ice sheet. We speculate that this major change might have resulted from an initial opening of the Drake Passage at 37 Ma, at least for surface- and intermediate-water circulation. |
format |
Dataset |
author |
Diester-Haass, Lieselotte Zahn, Rainer |
author_facet |
Diester-Haass, Lieselotte Zahn, Rainer |
author_sort |
Diester-Haass, Lieselotte |
title |
Calculation of paleoproductivity during the Eocene-Oligocene transition of ODP Site 113-689 |
title_short |
Calculation of paleoproductivity during the Eocene-Oligocene transition of ODP Site 113-689 |
title_full |
Calculation of paleoproductivity during the Eocene-Oligocene transition of ODP Site 113-689 |
title_fullStr |
Calculation of paleoproductivity during the Eocene-Oligocene transition of ODP Site 113-689 |
title_full_unstemmed |
Calculation of paleoproductivity during the Eocene-Oligocene transition of ODP Site 113-689 |
title_sort |
calculation of paleoproductivity during the eocene-oligocene transition of odp site 113-689 |
publisher |
PANGAEA |
publishDate |
1996 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.712516 https://doi.org/10.1594/PANGAEA.712516 |
op_coverage |
LATITUDE: -64.517000 * LONGITUDE: 3.100150 * DATE/TIME START: 1987-01-15T00:00:00 * DATE/TIME END: 1987-01-19T00:00:00 * MINIMUM DEPTH, sediment/rock: 74.48 m * MAXIMUM DEPTH, sediment/rock: 182.82 m |
long_lat |
ENVELOPE(3.100150,3.100150,-64.517000,-64.517000) |
genre |
Antarc* Antarctic Drake Passage Ice Sheet South Atlantic Ocean Weddell Sea |
genre_facet |
Antarc* Antarctic Drake Passage Ice Sheet South Atlantic Ocean Weddell Sea |
op_source |
Supplement to: Diester-Haass, Lieselotte; Zahn, Rainer (1996): Eocene-Oligocene transition in the Southern Ocean: History of water mass circulation and biological productivity. Geology, 24(2), 163-166, https://doi.org/10.1130/0091-7613(1996)024%3C0163:EOTITS%3E2.3.CO;2 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.712516 https://doi.org/10.1594/PANGAEA.712516 |
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.71251610.1130/0091-7613(1996)024%3C0163:EOTITS%3E2.3.CO;2 |
_version_ |
1810288943926607872 |