Stable carbon and oxygen istotope ratios of Oligocene foraminifera from ODP Hole 121-758A of the northern Ninetyeast Ridge, Indian Ocean (Appendix 1)
An Oligocene-basal Miocene (Zones P19-P22/N4) oxygen and carbon isotope stratigraphy is presented based on mixed benthic foraminiferal faunas and different species of planktic foraminifers from Eastem Indian Ocean ODP Hole 758A. Lack of covariance in planktic and benthic delta18O ratios indicates th...
Main Authors: | , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
1995
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.691305 https://doi.org/10.1594/PANGAEA.691305 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.691305 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.691305 2023-05-15T13:30:54+02:00 Stable carbon and oxygen istotope ratios of Oligocene foraminifera from ODP Hole 121-758A of the northern Ninetyeast Ridge, Indian Ocean (Appendix 1) van Eijden, AJM Ganssen, Gerald M LATITUDE: 5.384200 * LONGITUDE: 90.361200 * DATE/TIME START: 1988-06-15T23:50:00 * DATE/TIME END: 1988-06-24T13:30:00 * MINIMUM ORDINAL NUMBER: 1 * MAXIMUM ORDINAL NUMBER: 45 1995-04-22 text/tab-separated-values, 418 data points https://doi.pangaea.de/10.1594/PANGAEA.691305 https://doi.org/10.1594/PANGAEA.691305 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.691305 https://doi.org/10.1594/PANGAEA.691305 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: van Eijden, AJM; Ganssen, Gerald M (1995): An Oligocene multi-species foraminiferal oxygen and carbon isotope record from ODP Hole 758A (Indian Ocean): paleoceanographic and paleo-ecologic implications. Marine Micropaleontology, 25(1), 47-65, https://doi.org/10.1016/0377-8398(94)00028-L 121-758A Catapsydrax dissimilis δ13C δ18O Catapsydrax spp. Catapsydrax unicavus Comment DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Fohsella kugleri Foraminifera benthic δ13C benthic δ18O planktic δ13C planktic δ18O Globigerina binaiensis Globigerina euapertura Globigerina galavisi Globigerina sellii Globigerina tripartita Globorotaloides suteri Dataset 1995 ftpangaea https://doi.org/10.1594/PANGAEA.691305 https://doi.org/10.1016/0377-8398(94)00028-L 2023-01-20T08:45:47Z An Oligocene-basal Miocene (Zones P19-P22/N4) oxygen and carbon isotope stratigraphy is presented based on mixed benthic foraminiferal faunas and different species of planktic foraminifers from Eastem Indian Ocean ODP Hole 758A. Lack of covariance in planktic and benthic delta18O ratios indicates that many Oligocene sea level fluctuations, including the major fall at 30 Ma, are not of glacio-eustatic origin. Delta18O values suggest that test morphology is a poor indicator of preferred depth habitat of Oligocene planktic foraminifers. Also, some groups show considerable shifts in preferred depth habitat. Reconstructed surface water temperature was nearly constant during the investigated period, but even assuming a large Antarctic icecap, values are unrealistically low, 18°-20°C. Most likely, water masses with markedly different oxygen isotopic composition existed, this poses great problems for quantitative temperature reconstructions. Planktic foraminiferal species show similar delta13C ratios, indicating well-mixed surface waters. This contrasts with the strong oxygen isotopic gradient, which suggests well-stratified surface waters. During the Oligocene the difference in delta13C ratio between the average ratio of planktic foraminiferal species and the benthic foraminifers (Delta delta13C P-B') shows an inverse relation with the known circulation intensity record and thus with productivity. This Delta delta13C pattern is interpreted as being caused by the presence of younger bottom waters at this site during periods with lower temperatures and/or larger Antarctic ice sheets. Dataset Antarc* Antarctic PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Indian ENVELOPE(90.361200,90.361200,5.384200,5.384200) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
121-758A Catapsydrax dissimilis δ13C δ18O Catapsydrax spp. Catapsydrax unicavus Comment DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Fohsella kugleri Foraminifera benthic δ13C benthic δ18O planktic δ13C planktic δ18O Globigerina binaiensis Globigerina euapertura Globigerina galavisi Globigerina sellii Globigerina tripartita Globorotaloides suteri |
spellingShingle |
121-758A Catapsydrax dissimilis δ13C δ18O Catapsydrax spp. Catapsydrax unicavus Comment DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Fohsella kugleri Foraminifera benthic δ13C benthic δ18O planktic δ13C planktic δ18O Globigerina binaiensis Globigerina euapertura Globigerina galavisi Globigerina sellii Globigerina tripartita Globorotaloides suteri van Eijden, AJM Ganssen, Gerald M Stable carbon and oxygen istotope ratios of Oligocene foraminifera from ODP Hole 121-758A of the northern Ninetyeast Ridge, Indian Ocean (Appendix 1) |
topic_facet |
121-758A Catapsydrax dissimilis δ13C δ18O Catapsydrax spp. Catapsydrax unicavus Comment DRILL Drilling/drill rig DSDP/ODP/IODP sample designation Fohsella kugleri Foraminifera benthic δ13C benthic δ18O planktic δ13C planktic δ18O Globigerina binaiensis Globigerina euapertura Globigerina galavisi Globigerina sellii Globigerina tripartita Globorotaloides suteri |
description |
An Oligocene-basal Miocene (Zones P19-P22/N4) oxygen and carbon isotope stratigraphy is presented based on mixed benthic foraminiferal faunas and different species of planktic foraminifers from Eastem Indian Ocean ODP Hole 758A. Lack of covariance in planktic and benthic delta18O ratios indicates that many Oligocene sea level fluctuations, including the major fall at 30 Ma, are not of glacio-eustatic origin. Delta18O values suggest that test morphology is a poor indicator of preferred depth habitat of Oligocene planktic foraminifers. Also, some groups show considerable shifts in preferred depth habitat. Reconstructed surface water temperature was nearly constant during the investigated period, but even assuming a large Antarctic icecap, values are unrealistically low, 18°-20°C. Most likely, water masses with markedly different oxygen isotopic composition existed, this poses great problems for quantitative temperature reconstructions. Planktic foraminiferal species show similar delta13C ratios, indicating well-mixed surface waters. This contrasts with the strong oxygen isotopic gradient, which suggests well-stratified surface waters. During the Oligocene the difference in delta13C ratio between the average ratio of planktic foraminiferal species and the benthic foraminifers (Delta delta13C P-B') shows an inverse relation with the known circulation intensity record and thus with productivity. This Delta delta13C pattern is interpreted as being caused by the presence of younger bottom waters at this site during periods with lower temperatures and/or larger Antarctic ice sheets. |
format |
Dataset |
author |
van Eijden, AJM Ganssen, Gerald M |
author_facet |
van Eijden, AJM Ganssen, Gerald M |
author_sort |
van Eijden, AJM |
title |
Stable carbon and oxygen istotope ratios of Oligocene foraminifera from ODP Hole 121-758A of the northern Ninetyeast Ridge, Indian Ocean (Appendix 1) |
title_short |
Stable carbon and oxygen istotope ratios of Oligocene foraminifera from ODP Hole 121-758A of the northern Ninetyeast Ridge, Indian Ocean (Appendix 1) |
title_full |
Stable carbon and oxygen istotope ratios of Oligocene foraminifera from ODP Hole 121-758A of the northern Ninetyeast Ridge, Indian Ocean (Appendix 1) |
title_fullStr |
Stable carbon and oxygen istotope ratios of Oligocene foraminifera from ODP Hole 121-758A of the northern Ninetyeast Ridge, Indian Ocean (Appendix 1) |
title_full_unstemmed |
Stable carbon and oxygen istotope ratios of Oligocene foraminifera from ODP Hole 121-758A of the northern Ninetyeast Ridge, Indian Ocean (Appendix 1) |
title_sort |
stable carbon and oxygen istotope ratios of oligocene foraminifera from odp hole 121-758a of the northern ninetyeast ridge, indian ocean (appendix 1) |
publisher |
PANGAEA |
publishDate |
1995 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.691305 https://doi.org/10.1594/PANGAEA.691305 |
op_coverage |
LATITUDE: 5.384200 * LONGITUDE: 90.361200 * DATE/TIME START: 1988-06-15T23:50:00 * DATE/TIME END: 1988-06-24T13:30:00 * MINIMUM ORDINAL NUMBER: 1 * MAXIMUM ORDINAL NUMBER: 45 |
long_lat |
ENVELOPE(90.361200,90.361200,5.384200,5.384200) |
geographic |
Antarctic Indian |
geographic_facet |
Antarctic Indian |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Supplement to: van Eijden, AJM; Ganssen, Gerald M (1995): An Oligocene multi-species foraminiferal oxygen and carbon isotope record from ODP Hole 758A (Indian Ocean): paleoceanographic and paleo-ecologic implications. Marine Micropaleontology, 25(1), 47-65, https://doi.org/10.1016/0377-8398(94)00028-L |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.691305 https://doi.org/10.1594/PANGAEA.691305 |
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.691305 https://doi.org/10.1016/0377-8398(94)00028-L |
_version_ |
1766013750031155200 |