Oxygen and carbon isotope data for benthic foraminifera from DSDP Site 94-608 and ODP Site 208-1264
Small biserial foraminifera were abundant in the early Miocene (ca. 18.9-17.2 Ma) in the eastern Atlantic and western Indian Oceans, but absent in the western equatorial Atlantic Ocean, Weddell Sea, eastern Indian Ocean, and equatorial Pacific Ocean. They have been assigned to the benthic genus Boli...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.713696 2024-09-15T17:46:36+00:00 Oxygen and carbon isotope data for benthic foraminifera from DSDP Site 94-608 and ODP Site 208-1264 Smart, Christopher W Thomas, Ellen MEDIAN LATITUDE: 7.152055 * MEDIAN LONGITUDE: -10.121002 * SOUTH-BOUND LATITUDE: -28.532680 * WEST-BOUND LONGITUDE: -23.087500 * NORTH-BOUND LATITUDE: 42.836700 * EAST-BOUND LONGITUDE: 2.845510 * DATE/TIME START: 1983-07-13T00:00:00 * DATE/TIME END: 2003-04-08T03:50:00 2006 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.713696 https://doi.org/10.1594/PANGAEA.713696 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.713696 https://doi.org/10.1594/PANGAEA.713696 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Smart, Christopher W; Thomas, Ellen (2006): The enigma of early Miocene biserial planktic foraminifera. Geology, 34(12), 1041-1044, https://doi.org/10.1130/G23038A.1 208-1264A 208-1264B 94-608 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Joides Resolution Leg208 Leg94 North Atlantic/FLANK Ocean Drilling Program ODP Walvis Ridge Southeast Atlantic Ocean dataset publication series 2006 ftpangaea https://doi.org/10.1594/PANGAEA.71369610.1130/G23038A.1 2024-07-24T02:31:42Z Small biserial foraminifera were abundant in the early Miocene (ca. 18.9-17.2 Ma) in the eastern Atlantic and western Indian Oceans, but absent in the western equatorial Atlantic Ocean, Weddell Sea, eastern Indian Ocean, and equatorial Pacific Ocean. They have been assigned to the benthic genus Bolivina, but their high abundances in sediments without evidence for dysoxia could not be explained. Apertural morphology, accumulation rates, and isotopic composition show that they were planktic (genus Streptochilus). Living Streptochilus are common in productive waters with intermittent upwelling. The widespread early Miocene high Streptochilus abundances may reflect vigorous but intermittent upwelling, inducing high phytoplankton growth rates. However, export production (estimated from benthic foraminiferal accumulation rates) was low, possibly due to high regeneration rates in a deep thermocline. The upwelled waters may have been an analog to Subantarctic Mode Waters, carrying nutrients into the eastern Atlantic and western Indian Oceans as the result of the initiation of a deep-reaching Antarctic Circumpolar Current, active Agulhas Leakage, and vigorous vertical mixing in the Southern Oceans. Other/Unknown Material Antarc* Antarctic North Atlantic Weddell Sea PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-23.087500,2.845510,42.836700,-28.532680) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
208-1264A 208-1264B 94-608 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Joides Resolution Leg208 Leg94 North Atlantic/FLANK Ocean Drilling Program ODP Walvis Ridge Southeast Atlantic Ocean |
spellingShingle |
208-1264A 208-1264B 94-608 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Joides Resolution Leg208 Leg94 North Atlantic/FLANK Ocean Drilling Program ODP Walvis Ridge Southeast Atlantic Ocean Smart, Christopher W Thomas, Ellen Oxygen and carbon isotope data for benthic foraminifera from DSDP Site 94-608 and ODP Site 208-1264 |
topic_facet |
208-1264A 208-1264B 94-608 Deep Sea Drilling Project DRILL Drilling/drill rig DSDP Glomar Challenger Joides Resolution Leg208 Leg94 North Atlantic/FLANK Ocean Drilling Program ODP Walvis Ridge Southeast Atlantic Ocean |
description |
Small biserial foraminifera were abundant in the early Miocene (ca. 18.9-17.2 Ma) in the eastern Atlantic and western Indian Oceans, but absent in the western equatorial Atlantic Ocean, Weddell Sea, eastern Indian Ocean, and equatorial Pacific Ocean. They have been assigned to the benthic genus Bolivina, but their high abundances in sediments without evidence for dysoxia could not be explained. Apertural morphology, accumulation rates, and isotopic composition show that they were planktic (genus Streptochilus). Living Streptochilus are common in productive waters with intermittent upwelling. The widespread early Miocene high Streptochilus abundances may reflect vigorous but intermittent upwelling, inducing high phytoplankton growth rates. However, export production (estimated from benthic foraminiferal accumulation rates) was low, possibly due to high regeneration rates in a deep thermocline. The upwelled waters may have been an analog to Subantarctic Mode Waters, carrying nutrients into the eastern Atlantic and western Indian Oceans as the result of the initiation of a deep-reaching Antarctic Circumpolar Current, active Agulhas Leakage, and vigorous vertical mixing in the Southern Oceans. |
format |
Other/Unknown Material |
author |
Smart, Christopher W Thomas, Ellen |
author_facet |
Smart, Christopher W Thomas, Ellen |
author_sort |
Smart, Christopher W |
title |
Oxygen and carbon isotope data for benthic foraminifera from DSDP Site 94-608 and ODP Site 208-1264 |
title_short |
Oxygen and carbon isotope data for benthic foraminifera from DSDP Site 94-608 and ODP Site 208-1264 |
title_full |
Oxygen and carbon isotope data for benthic foraminifera from DSDP Site 94-608 and ODP Site 208-1264 |
title_fullStr |
Oxygen and carbon isotope data for benthic foraminifera from DSDP Site 94-608 and ODP Site 208-1264 |
title_full_unstemmed |
Oxygen and carbon isotope data for benthic foraminifera from DSDP Site 94-608 and ODP Site 208-1264 |
title_sort |
oxygen and carbon isotope data for benthic foraminifera from dsdp site 94-608 and odp site 208-1264 |
publisher |
PANGAEA |
publishDate |
2006 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.713696 https://doi.org/10.1594/PANGAEA.713696 |
op_coverage |
MEDIAN LATITUDE: 7.152055 * MEDIAN LONGITUDE: -10.121002 * SOUTH-BOUND LATITUDE: -28.532680 * WEST-BOUND LONGITUDE: -23.087500 * NORTH-BOUND LATITUDE: 42.836700 * EAST-BOUND LONGITUDE: 2.845510 * DATE/TIME START: 1983-07-13T00:00:00 * DATE/TIME END: 2003-04-08T03:50:00 |
long_lat |
ENVELOPE(-23.087500,2.845510,42.836700,-28.532680) |
genre |
Antarc* Antarctic North Atlantic Weddell Sea |
genre_facet |
Antarc* Antarctic North Atlantic Weddell Sea |
op_source |
Supplement to: Smart, Christopher W; Thomas, Ellen (2006): The enigma of early Miocene biserial planktic foraminifera. Geology, 34(12), 1041-1044, https://doi.org/10.1130/G23038A.1 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.713696 https://doi.org/10.1594/PANGAEA.713696 |
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.71369610.1130/G23038A.1 |
_version_ |
1810494871419486208 |