Upper Cretaceous calcareous nannofossils from Broken Ridge and Ninetyeast Ridge
Drilling at Broken Ridge and Ninetyeast Ridge during Ocean Drilling Program Leg 121 yielded thick sections of Upper Cretaceous nannofossil-bearing sediments including calcareous chalk, limestone with chert, and volcanic ash. The upper Campanian to Maestrichtian assemblages from Broken Ridge are aust...
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1991
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.728987 2023-05-15T18:25:42+02:00 Upper Cretaceous calcareous nannofossils from Broken Ridge and Ninetyeast Ridge Resiwati, Purtyasti MEDIAN LATITUDE: -23.683760 * MEDIAN LONGITUDE: 92.923680 * SOUTH-BOUND LATITUDE: -31.030000 * WEST-BOUND LONGITUDE: 90.361200 * NORTH-BOUND LATITUDE: 5.384200 * EAST-BOUND LONGITUDE: 93.577500 * DATE/TIME START: 1988-05-13T18:30:00 * DATE/TIME END: 1988-06-24T13:30:00 1991-11-06 application/zip, 5 datasets https://doi.pangaea.de/10.1594/PANGAEA.728987 https://doi.org/10.1594/PANGAEA.728987 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.728987 https://doi.org/10.1594/PANGAEA.728987 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Resiwati, Purtyasti (1991): Upper Cretaceous calcareous nannofossils from Broken Ridge and Ninetyeast Ridge, 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, 141-170, https://doi.org/10.2973/odp.proc.sr.121.141.1991 121-752B 121-754A 121-754B 121-755A 121-758A DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg121 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean Dataset 1991 ftpangaea https://doi.org/10.1594/PANGAEA.728987 https://doi.org/10.2973/odp.proc.sr.121.141.1991 2023-01-20T07:31:34Z Drilling at Broken Ridge and Ninetyeast Ridge during Ocean Drilling Program Leg 121 yielded thick sections of Upper Cretaceous nannofossil-bearing sediments including calcareous chalk, limestone with chert, and volcanic ash. The upper Campanian to Maestrichtian assemblages from Broken Ridge are austral in nature, containing many of the endemic Southern Ocean forms observed from the Falkland Plateau, Weddell Sea, and the Kerguelen Plateau. The absence of the Lithraphidites praequadratus-L. quadratus lineage and significant overlap of the first-appearance datum of Nephrolithus frequens and the last-appearance datum of Reinhardtites levis negate direct use of temperate zonation schemes for these sediments: the austral zonation is more effective but has lower stratigraphic resolution. The upper Campanian to Maestrichtian of Ninetyeast Ridge contains both austral and tropical forms in different horizons; the modified zonation of Sissingh (1977) is most effective in age-dating these sediments. The Turonian-Santonian calcareous nannofossil assemblages are relatively sparse and poorly preserved. The absence of diagnostic species in the Turonian-Santonian sections is due to poor preservation and the unfavorable paleoenvironment of the rapid deposition of the thick ash in this interval. Biostratigraphic resolution is significantly impaired in this interval. Dataset Southern Ocean Weddell Sea PANGAEA - Data Publisher for Earth & Environmental Science Southern Ocean Weddell Sea Austral Kerguelen Indian Weddell Falkland Plateau ENVELOPE(-50.000,-50.000,-51.000,-51.000) Broken Ridge ENVELOPE(-92.318,-92.318,79.552,79.552) ENVELOPE(90.361200,93.577500,5.384200,-31.030000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
121-752B 121-754A 121-754B 121-755A 121-758A DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg121 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean |
spellingShingle |
121-752B 121-754A 121-754B 121-755A 121-758A DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg121 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean Resiwati, Purtyasti Upper Cretaceous calcareous nannofossils from Broken Ridge and Ninetyeast Ridge |
topic_facet |
121-752B 121-754A 121-754B 121-755A 121-758A DRILL Drilling/drill rig Indian Ocean Joides Resolution Leg121 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean |
description |
Drilling at Broken Ridge and Ninetyeast Ridge during Ocean Drilling Program Leg 121 yielded thick sections of Upper Cretaceous nannofossil-bearing sediments including calcareous chalk, limestone with chert, and volcanic ash. The upper Campanian to Maestrichtian assemblages from Broken Ridge are austral in nature, containing many of the endemic Southern Ocean forms observed from the Falkland Plateau, Weddell Sea, and the Kerguelen Plateau. The absence of the Lithraphidites praequadratus-L. quadratus lineage and significant overlap of the first-appearance datum of Nephrolithus frequens and the last-appearance datum of Reinhardtites levis negate direct use of temperate zonation schemes for these sediments: the austral zonation is more effective but has lower stratigraphic resolution. The upper Campanian to Maestrichtian of Ninetyeast Ridge contains both austral and tropical forms in different horizons; the modified zonation of Sissingh (1977) is most effective in age-dating these sediments. The Turonian-Santonian calcareous nannofossil assemblages are relatively sparse and poorly preserved. The absence of diagnostic species in the Turonian-Santonian sections is due to poor preservation and the unfavorable paleoenvironment of the rapid deposition of the thick ash in this interval. Biostratigraphic resolution is significantly impaired in this interval. |
format |
Dataset |
author |
Resiwati, Purtyasti |
author_facet |
Resiwati, Purtyasti |
author_sort |
Resiwati, Purtyasti |
title |
Upper Cretaceous calcareous nannofossils from Broken Ridge and Ninetyeast Ridge |
title_short |
Upper Cretaceous calcareous nannofossils from Broken Ridge and Ninetyeast Ridge |
title_full |
Upper Cretaceous calcareous nannofossils from Broken Ridge and Ninetyeast Ridge |
title_fullStr |
Upper Cretaceous calcareous nannofossils from Broken Ridge and Ninetyeast Ridge |
title_full_unstemmed |
Upper Cretaceous calcareous nannofossils from Broken Ridge and Ninetyeast Ridge |
title_sort |
upper cretaceous calcareous nannofossils from broken ridge and ninetyeast ridge |
publisher |
PANGAEA |
publishDate |
1991 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.728987 https://doi.org/10.1594/PANGAEA.728987 |
op_coverage |
MEDIAN LATITUDE: -23.683760 * MEDIAN LONGITUDE: 92.923680 * SOUTH-BOUND LATITUDE: -31.030000 * WEST-BOUND LONGITUDE: 90.361200 * NORTH-BOUND LATITUDE: 5.384200 * EAST-BOUND LONGITUDE: 93.577500 * DATE/TIME START: 1988-05-13T18:30:00 * DATE/TIME END: 1988-06-24T13:30:00 |
long_lat |
ENVELOPE(-50.000,-50.000,-51.000,-51.000) ENVELOPE(-92.318,-92.318,79.552,79.552) ENVELOPE(90.361200,93.577500,5.384200,-31.030000) |
geographic |
Southern Ocean Weddell Sea Austral Kerguelen Indian Weddell Falkland Plateau Broken Ridge |
geographic_facet |
Southern Ocean Weddell Sea Austral Kerguelen Indian Weddell Falkland Plateau Broken Ridge |
genre |
Southern Ocean Weddell Sea |
genre_facet |
Southern Ocean Weddell Sea |
op_source |
Supplement to: Resiwati, Purtyasti (1991): Upper Cretaceous calcareous nannofossils from Broken Ridge and Ninetyeast Ridge, 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, 141-170, https://doi.org/10.2973/odp.proc.sr.121.141.1991 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.728987 https://doi.org/10.1594/PANGAEA.728987 |
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.728987 https://doi.org/10.2973/odp.proc.sr.121.141.1991 |
_version_ |
1766207303206305792 |