Upper Maestrichtian to Eocene benthic foraminifera in ODP Leg 121 holes
Late Maestrichtian to late Eocene bathyal benthic foraminiferal faunas at Sites 752,753, and 754 on Broken Ridge in the eastern Indian Ocean were analyzed as to their stratigraphic distribution of species to clarify the relation between faunal turnovers and paleoceanographic changes. Based on Q-mode...
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1991
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.728944 2024-09-15T17:43:30+00:00 Upper Maestrichtian to Eocene benthic foraminifera in ODP Leg 121 holes Nomura, Ritsuo MEDIAN LATITUDE: -30.890275 * MEDIAN LONGITUDE: 93.578139 * SOUTH-BOUND LATITUDE: -30.941000 * WEST-BOUND LONGITUDE: 93.566500 * NORTH-BOUND LATITUDE: -30.839000 * EAST-BOUND LONGITUDE: 93.589900 * DATE/TIME START: 1988-05-10T03:15:00 * DATE/TIME END: 1988-05-22T12:30:00 1991 application/zip, 5 datasets https://doi.pangaea.de/10.1594/PANGAEA.728944 https://doi.org/10.1594/PANGAEA.728944 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.728944 https://doi.org/10.1594/PANGAEA.728944 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess Supplement to: Nomura, Ritsuo (1991): Paleoceanography of the upper Maestrichtian to Eocene benthic foraminiferal assemblages at Sites 752, 753, and 754, eastern Indian Ocean. In: Weissel, J; Peirce, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 121, 3-29, https://doi.org/10.2973/odp.proc.sr.121.138.1991 121-752A 121-752B 121-753A 121-754A DRILL Drilling/drill rig Joides Resolution Leg121 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean dataset publication series 1991 ftpangaea https://doi.org/10.1594/PANGAEA.72894410.2973/odp.proc.sr.121.138.1991 2024-07-24T02:31:20Z Late Maestrichtian to late Eocene bathyal benthic foraminiferal faunas at Sites 752,753, and 754 on Broken Ridge in the eastern Indian Ocean were analyzed as to their stratigraphic distribution of species to clarify the relation between faunal turnovers and paleoceanographic changes. Based on Q-mode factor analysis, eight varimax assemblages were distinguished: the Stensioina beccariiformis assemblage in the upper Maestrichtian to upper Paleocene; the Cibicidoides hyphalus assemblage in the upper Maestrichtian; the Cibicidoides cf. pseudoperlucidus assemblage in the upper Paleocene; the Anomalinoides capitatusldanicus assemblage in the uppermost Paleocene to lower Eocene; the Cibicidoides subspiratus assemblage in the lower Eocene; the Nuttallides truempyi assemblage in the lower and middle Eocene; the Osangularia sp. 1 - Hanzawaia ammophila assemblage in the upper Eocene; and the Lenticulina spp. assemblage in the uppermost Eocene, Oligocene, and lower Miocene. The presence of the Osangularia sp. 1 - Hanzawaia ammophila assemblage is related to the shallowing episode on Broken Ridge (upper bathyal), as a result of the rifting event that occurred in the middle Eocene. The most distinct faunal change (the disappearance of about 37% of the species) occurred between the S. beccariiformis assemblage and the A. capitatusldanicus assemblage, at the end of the upper Paleocene. A. capitatusldanicus, Lenticulina spp., and varied forms of Cibicidoides replaced the Velasco-type fauna at this time. The timing of this event is well correlated with the known age at South Atlantic sites (Thomas, 1990 doi:10.2973/odp.proc.sr.113.123.1990; Kennett and Stott, 1990 doi:10.2973/odp.proc.sr.113.188.1990; Katz and Miller, 1990 doi:10.2973/odp.proc.sr.114.147.1991). The primary cause of the extinction of the Stensioina beccariiformis assemblage is elusive, but may have resulted from the cessation of deep-water formation in the Antarctic (Katz and Miller, 1990), and subsequent arrival of warm saline deep water (Thomas, 1990; Kennett ... Other/Unknown Material Antarc* Antarctic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(93.566500,93.589900,-30.839000,-30.941000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
121-752A 121-752B 121-753A 121-754A DRILL Drilling/drill rig Joides Resolution Leg121 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean |
spellingShingle |
121-752A 121-752B 121-753A 121-754A DRILL Drilling/drill rig Joides Resolution Leg121 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean Nomura, Ritsuo Upper Maestrichtian to Eocene benthic foraminifera in ODP Leg 121 holes |
topic_facet |
121-752A 121-752B 121-753A 121-754A DRILL Drilling/drill rig Joides Resolution Leg121 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean |
description |
Late Maestrichtian to late Eocene bathyal benthic foraminiferal faunas at Sites 752,753, and 754 on Broken Ridge in the eastern Indian Ocean were analyzed as to their stratigraphic distribution of species to clarify the relation between faunal turnovers and paleoceanographic changes. Based on Q-mode factor analysis, eight varimax assemblages were distinguished: the Stensioina beccariiformis assemblage in the upper Maestrichtian to upper Paleocene; the Cibicidoides hyphalus assemblage in the upper Maestrichtian; the Cibicidoides cf. pseudoperlucidus assemblage in the upper Paleocene; the Anomalinoides capitatusldanicus assemblage in the uppermost Paleocene to lower Eocene; the Cibicidoides subspiratus assemblage in the lower Eocene; the Nuttallides truempyi assemblage in the lower and middle Eocene; the Osangularia sp. 1 - Hanzawaia ammophila assemblage in the upper Eocene; and the Lenticulina spp. assemblage in the uppermost Eocene, Oligocene, and lower Miocene. The presence of the Osangularia sp. 1 - Hanzawaia ammophila assemblage is related to the shallowing episode on Broken Ridge (upper bathyal), as a result of the rifting event that occurred in the middle Eocene. The most distinct faunal change (the disappearance of about 37% of the species) occurred between the S. beccariiformis assemblage and the A. capitatusldanicus assemblage, at the end of the upper Paleocene. A. capitatusldanicus, Lenticulina spp., and varied forms of Cibicidoides replaced the Velasco-type fauna at this time. The timing of this event is well correlated with the known age at South Atlantic sites (Thomas, 1990 doi:10.2973/odp.proc.sr.113.123.1990; Kennett and Stott, 1990 doi:10.2973/odp.proc.sr.113.188.1990; Katz and Miller, 1990 doi:10.2973/odp.proc.sr.114.147.1991). The primary cause of the extinction of the Stensioina beccariiformis assemblage is elusive, but may have resulted from the cessation of deep-water formation in the Antarctic (Katz and Miller, 1990), and subsequent arrival of warm saline deep water (Thomas, 1990; Kennett ... |
format |
Other/Unknown Material |
author |
Nomura, Ritsuo |
author_facet |
Nomura, Ritsuo |
author_sort |
Nomura, Ritsuo |
title |
Upper Maestrichtian to Eocene benthic foraminifera in ODP Leg 121 holes |
title_short |
Upper Maestrichtian to Eocene benthic foraminifera in ODP Leg 121 holes |
title_full |
Upper Maestrichtian to Eocene benthic foraminifera in ODP Leg 121 holes |
title_fullStr |
Upper Maestrichtian to Eocene benthic foraminifera in ODP Leg 121 holes |
title_full_unstemmed |
Upper Maestrichtian to Eocene benthic foraminifera in ODP Leg 121 holes |
title_sort |
upper maestrichtian to eocene benthic foraminifera in odp leg 121 holes |
publisher |
PANGAEA |
publishDate |
1991 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.728944 https://doi.org/10.1594/PANGAEA.728944 |
op_coverage |
MEDIAN LATITUDE: -30.890275 * MEDIAN LONGITUDE: 93.578139 * SOUTH-BOUND LATITUDE: -30.941000 * WEST-BOUND LONGITUDE: 93.566500 * NORTH-BOUND LATITUDE: -30.839000 * EAST-BOUND LONGITUDE: 93.589900 * DATE/TIME START: 1988-05-10T03:15:00 * DATE/TIME END: 1988-05-22T12:30:00 |
long_lat |
ENVELOPE(93.566500,93.589900,-30.839000,-30.941000) |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Supplement to: Nomura, Ritsuo (1991): Paleoceanography of the upper Maestrichtian to Eocene benthic foraminiferal assemblages at Sites 752, 753, and 754, eastern Indian Ocean. In: Weissel, J; Peirce, J; Taylor, E; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 121, 3-29, https://doi.org/10.2973/odp.proc.sr.121.138.1991 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.728944 https://doi.org/10.1594/PANGAEA.728944 |
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.72894410.2973/odp.proc.sr.121.138.1991 |
_version_ |
1810490516959133696 |