Paleocene planktonic foraminifers of the subantarctic South Atlantic

Paleogene planktonic foraminifers recovered during ODP Leg 114 in the subantarctic region exhibit a cosmopolitan character at the opening of the Paleocene, and then they evolve similarly to faunas from lower latitudes. They begin to differentiate from lower latitude faunas by the early late Paleocen...

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Main Authors: Nocchi, Marisa, Amici, Emanuela, Premoli Silva, Isabella
Format: Other/Unknown Material
Language:English
Published: PANGAEA 1991
Subjects:
ODP
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.755560
https://doi.org/10.1594/PANGAEA.755560
id ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.755560
record_format openpolar
spelling ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.755560 2024-09-15T18:36:32+00:00 Paleocene planktonic foraminifers of the subantarctic South Atlantic Nocchi, Marisa Amici, Emanuela Premoli Silva, Isabella MEDIAN LATITUDE: -50.506200 * MEDIAN LONGITUDE: -22.505688 * SOUTH-BOUND LATITUDE: -51.542000 * WEST-BOUND LONGITUDE: -33.099300 * NORTH-BOUND LATITUDE: -47.051000 * EAST-BOUND LONGITUDE: 7.894700 * DATE/TIME START: 1987-03-16T13:05:00 * DATE/TIME END: 1987-04-24T07:14:00 1991 application/zip, 5 datasets https://doi.pangaea.de/10.1594/PANGAEA.755560 https://doi.org/10.1594/PANGAEA.755560 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.755560 https://doi.org/10.1594/PANGAEA.755560 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Nocchi, Marisa; Amici, Emanuela; Premoli Silva, Isabella (1991): Planktonic foraminiferal biostratigraphy and paleoenvironmental interpretation of Paleogene faunas from the subantarctic transect, Leg 114. In: Ciesielski, PF; Kristoffersen, Y; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 114, 233-279, https://doi.org/10.2973/odp.proc.sr.114.127.1991 114-698A 114-699A 114-700B 114-702A 114-702B 114-703A DRILL Drilling/drill rig Joides Resolution Leg114 Ocean Drilling Program ODP South Atlantic Ocean dataset publication series 1991 ftpangaea https://doi.org/10.1594/PANGAEA.75556010.2973/odp.proc.sr.114.127.1991 2024-07-24T02:31:20Z Paleogene planktonic foraminifers recovered during ODP Leg 114 in the subantarctic region exhibit a cosmopolitan character at the opening of the Paleocene, and then they evolve similarly to faunas from lower latitudes. They begin to differentiate from lower latitude faunas by the early late Paleocene when large morozovellids disappear from the region and cool deep-water-dwelling Globorotaloides appear much earlier than at lower latitudes. By early Eocene time large morozovellids immigrate into the subantarctic area during the warmest episode of the entire Eocene. From that time up to the end of the middle Eocene planktonic foraminiferal faunas exhibit a temperate character, as indicated by the abundance of common acarininids. At the same time dissolution at depth causes depauperated planktonic faunas at the deeper sites. A new warming episode during the late Eocene is marked by the immigration of Globigerinatheka luterbacheri into the subantarctic region. The cooling trend during the late Eocene causes a progressive decrease in species richness, which only sporadically is less than 10 species. The early Oligocene is also characterized by relatively rich planktonic faunas, but after that time the western subantarctic region is occasionally invaded by few planktonic foraminiferal species. These immigrations coincide with the warmer episodes on the climatic curve, such as Zones P21a and P22-"N4." Beginning in late early Eocene and through the Oligocene eastern subantarctic planktonic foraminiferal faunas exhibit a much warmer character than those from the western side and are more similar to warm temperate faunas. Therefore, the eastern faunas provide a more refined biostratigraphy. Oligocene time is characterized by a trend toward a warmer climate; however, this trend was reversed in the early Miocene. A dissolution event, possibly coeval with an erosional event, occurs within Zone P21b across the subantarctic region. Other/Unknown Material South Atlantic Ocean PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-33.099300,7.894700,-47.051000,-51.542000)
institution Open Polar
collection PANGAEA - Data Publisher for Earth & Environmental Science
op_collection_id ftpangaea
language English
topic 114-698A
114-699A
114-700B
114-702A
114-702B
114-703A
DRILL
Drilling/drill rig
Joides Resolution
Leg114
Ocean Drilling Program
ODP
South Atlantic Ocean
spellingShingle 114-698A
114-699A
114-700B
114-702A
114-702B
114-703A
DRILL
Drilling/drill rig
Joides Resolution
Leg114
Ocean Drilling Program
ODP
South Atlantic Ocean
Nocchi, Marisa
Amici, Emanuela
Premoli Silva, Isabella
Paleocene planktonic foraminifers of the subantarctic South Atlantic
topic_facet 114-698A
114-699A
114-700B
114-702A
114-702B
114-703A
DRILL
Drilling/drill rig
Joides Resolution
Leg114
Ocean Drilling Program
ODP
South Atlantic Ocean
description Paleogene planktonic foraminifers recovered during ODP Leg 114 in the subantarctic region exhibit a cosmopolitan character at the opening of the Paleocene, and then they evolve similarly to faunas from lower latitudes. They begin to differentiate from lower latitude faunas by the early late Paleocene when large morozovellids disappear from the region and cool deep-water-dwelling Globorotaloides appear much earlier than at lower latitudes. By early Eocene time large morozovellids immigrate into the subantarctic area during the warmest episode of the entire Eocene. From that time up to the end of the middle Eocene planktonic foraminiferal faunas exhibit a temperate character, as indicated by the abundance of common acarininids. At the same time dissolution at depth causes depauperated planktonic faunas at the deeper sites. A new warming episode during the late Eocene is marked by the immigration of Globigerinatheka luterbacheri into the subantarctic region. The cooling trend during the late Eocene causes a progressive decrease in species richness, which only sporadically is less than 10 species. The early Oligocene is also characterized by relatively rich planktonic faunas, but after that time the western subantarctic region is occasionally invaded by few planktonic foraminiferal species. These immigrations coincide with the warmer episodes on the climatic curve, such as Zones P21a and P22-"N4." Beginning in late early Eocene and through the Oligocene eastern subantarctic planktonic foraminiferal faunas exhibit a much warmer character than those from the western side and are more similar to warm temperate faunas. Therefore, the eastern faunas provide a more refined biostratigraphy. Oligocene time is characterized by a trend toward a warmer climate; however, this trend was reversed in the early Miocene. A dissolution event, possibly coeval with an erosional event, occurs within Zone P21b across the subantarctic region.
format Other/Unknown Material
author Nocchi, Marisa
Amici, Emanuela
Premoli Silva, Isabella
author_facet Nocchi, Marisa
Amici, Emanuela
Premoli Silva, Isabella
author_sort Nocchi, Marisa
title Paleocene planktonic foraminifers of the subantarctic South Atlantic
title_short Paleocene planktonic foraminifers of the subantarctic South Atlantic
title_full Paleocene planktonic foraminifers of the subantarctic South Atlantic
title_fullStr Paleocene planktonic foraminifers of the subantarctic South Atlantic
title_full_unstemmed Paleocene planktonic foraminifers of the subantarctic South Atlantic
title_sort paleocene planktonic foraminifers of the subantarctic south atlantic
publisher PANGAEA
publishDate 1991
url https://doi.pangaea.de/10.1594/PANGAEA.755560
https://doi.org/10.1594/PANGAEA.755560
op_coverage MEDIAN LATITUDE: -50.506200 * MEDIAN LONGITUDE: -22.505688 * SOUTH-BOUND LATITUDE: -51.542000 * WEST-BOUND LONGITUDE: -33.099300 * NORTH-BOUND LATITUDE: -47.051000 * EAST-BOUND LONGITUDE: 7.894700 * DATE/TIME START: 1987-03-16T13:05:00 * DATE/TIME END: 1987-04-24T07:14:00
long_lat ENVELOPE(-33.099300,7.894700,-47.051000,-51.542000)
genre South Atlantic Ocean
genre_facet South Atlantic Ocean
op_source Supplement to: Nocchi, Marisa; Amici, Emanuela; Premoli Silva, Isabella (1991): Planktonic foraminiferal biostratigraphy and paleoenvironmental interpretation of Paleogene faunas from the subantarctic transect, Leg 114. In: Ciesielski, PF; Kristoffersen, Y; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 114, 233-279, https://doi.org/10.2973/odp.proc.sr.114.127.1991
op_relation https://doi.pangaea.de/10.1594/PANGAEA.755560
https://doi.org/10.1594/PANGAEA.755560
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.75556010.2973/odp.proc.sr.114.127.1991
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