Neogen carbonate and stable isotope record of ODP Hole 120-751A
Lower Miocene through upper Pleistocene benthic foraminifer assemblage records from Ocean Drilling Program Site 751 on the Southern Kerguelen Plateau (57°44'S, water depth 1634 m) were combined with benthic and planktonic foraminifer oxygen and carbon isotope records and high-resolution CaCO3 d...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.760328 2023-05-15T13:42:10+02:00 Neogen carbonate and stable isotope record of ODP Hole 120-751A Mackensen, Andreas Barrera, Enriqueta C Hubberten, Hans-Wolfgang LATITUDE: -57.726000 * LONGITUDE: 79.814800 * DATE/TIME START: 1988-04-18T20:00:00 * DATE/TIME END: 1988-04-19T23:30:00 1992-05-11 application/zip, 3 datasets https://doi.pangaea.de/10.1594/PANGAEA.760328 https://doi.org/10.1594/PANGAEA.760328 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.760328 https://doi.org/10.1594/PANGAEA.760328 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Mackensen, Andreas; Barrera, Enriqueta C; Hubberten, Hans-Wolfgang (1992): Neogene circulation in the southern Indian Ocean: evidence from benthic foraminifers, carbonate data, and stable isotope analyses (Site 751). In: S.W. Wise, JR., R. Schlich, et al., Proceedings of the Ocean Drilling Program, Scientific Results, 120, College Station, TX (Ocean Drilling Program), 867-880, https://doi.org/10.2973/odp.proc.sr.120.169.1992 120-751A DRILL Drilling/drill rig Joides Resolution Leg120 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean Dataset 1992 ftpangaea https://doi.org/10.1594/PANGAEA.760328 https://doi.org/10.2973/odp.proc.sr.120.169.1992 2023-01-20T07:32:10Z Lower Miocene through upper Pleistocene benthic foraminifer assemblage records from Ocean Drilling Program Site 751 on the Southern Kerguelen Plateau (57°44'S, water depth 1634 m) were combined with benthic and planktonic foraminifer oxygen and carbon isotope records and high-resolution CaCO3 data from the same site. Implications for the Neogene productivity and paleoceanography of the southern Indian Ocean are discussed. We used distinctive features of the Miocene d18O and d13C curves for stratigraphic correlation. Coinciding with a lower middle Miocene hiatus from 14.2 to 13.4 Ma, there was a rapid increase in benthic d18O values by 1.2 per mil. This distinct increase occurs in middle Miocene benthic foraminifer oxygen isotope curves from all oceans. No major change, however, in benthic foraminifer faunal composition occurred in this period of growth of the Antarctic ice cap and cooling of deep ocean waters (14.9-14.2 Ma). A drastic change in benthic foraminifer faunas coincided with a hiatus from 8.4 to 5.9 Ma. Shortly after this hiatus, in the latest Miocene, the CaCO3 content of the sediments dropped from 75% to 0%. From that time ( 5.8 Ma) through the early Pliocene, Site 751 has been situated beneath a high biogenic siliceous productivity zone. Carbonate contents of upper Pliocene and Pleistocene sediments vary between 20% and 70%. The benthic foraminifer faunas in the uppermost Pliocene and lower Pleistocene reflect strong bottom current conditions, in contrast to those in the upper Pleistocene, which indicate calm sedimentation and high food supply. High d13C values of planktonic foraminifers compared with low values of benthic foraminifers suggest high primary productivity in the late Pleistocene. The changes in productivity were probably a result of latitudinal migration and meandering of the Polar Frontal Zone. Dataset Antarc* Antarctic Ice cap PANGAEA - Data Publisher for Earth & Environmental Science Antarctic Indian Kerguelen The Antarctic ENVELOPE(79.814800,79.814800,-57.726000,-57.726000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
120-751A DRILL Drilling/drill rig Joides Resolution Leg120 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean |
spellingShingle |
120-751A DRILL Drilling/drill rig Joides Resolution Leg120 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean Mackensen, Andreas Barrera, Enriqueta C Hubberten, Hans-Wolfgang Neogen carbonate and stable isotope record of ODP Hole 120-751A |
topic_facet |
120-751A DRILL Drilling/drill rig Joides Resolution Leg120 Ocean Drilling Program ODP South Indian Ridge South Indian Ocean |
description |
Lower Miocene through upper Pleistocene benthic foraminifer assemblage records from Ocean Drilling Program Site 751 on the Southern Kerguelen Plateau (57°44'S, water depth 1634 m) were combined with benthic and planktonic foraminifer oxygen and carbon isotope records and high-resolution CaCO3 data from the same site. Implications for the Neogene productivity and paleoceanography of the southern Indian Ocean are discussed. We used distinctive features of the Miocene d18O and d13C curves for stratigraphic correlation. Coinciding with a lower middle Miocene hiatus from 14.2 to 13.4 Ma, there was a rapid increase in benthic d18O values by 1.2 per mil. This distinct increase occurs in middle Miocene benthic foraminifer oxygen isotope curves from all oceans. No major change, however, in benthic foraminifer faunal composition occurred in this period of growth of the Antarctic ice cap and cooling of deep ocean waters (14.9-14.2 Ma). A drastic change in benthic foraminifer faunas coincided with a hiatus from 8.4 to 5.9 Ma. Shortly after this hiatus, in the latest Miocene, the CaCO3 content of the sediments dropped from 75% to 0%. From that time ( 5.8 Ma) through the early Pliocene, Site 751 has been situated beneath a high biogenic siliceous productivity zone. Carbonate contents of upper Pliocene and Pleistocene sediments vary between 20% and 70%. The benthic foraminifer faunas in the uppermost Pliocene and lower Pleistocene reflect strong bottom current conditions, in contrast to those in the upper Pleistocene, which indicate calm sedimentation and high food supply. High d13C values of planktonic foraminifers compared with low values of benthic foraminifers suggest high primary productivity in the late Pleistocene. The changes in productivity were probably a result of latitudinal migration and meandering of the Polar Frontal Zone. |
format |
Dataset |
author |
Mackensen, Andreas Barrera, Enriqueta C Hubberten, Hans-Wolfgang |
author_facet |
Mackensen, Andreas Barrera, Enriqueta C Hubberten, Hans-Wolfgang |
author_sort |
Mackensen, Andreas |
title |
Neogen carbonate and stable isotope record of ODP Hole 120-751A |
title_short |
Neogen carbonate and stable isotope record of ODP Hole 120-751A |
title_full |
Neogen carbonate and stable isotope record of ODP Hole 120-751A |
title_fullStr |
Neogen carbonate and stable isotope record of ODP Hole 120-751A |
title_full_unstemmed |
Neogen carbonate and stable isotope record of ODP Hole 120-751A |
title_sort |
neogen carbonate and stable isotope record of odp hole 120-751a |
publisher |
PANGAEA |
publishDate |
1992 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.760328 https://doi.org/10.1594/PANGAEA.760328 |
op_coverage |
LATITUDE: -57.726000 * LONGITUDE: 79.814800 * DATE/TIME START: 1988-04-18T20:00:00 * DATE/TIME END: 1988-04-19T23:30:00 |
long_lat |
ENVELOPE(79.814800,79.814800,-57.726000,-57.726000) |
geographic |
Antarctic Indian Kerguelen The Antarctic |
geographic_facet |
Antarctic Indian Kerguelen The Antarctic |
genre |
Antarc* Antarctic Ice cap |
genre_facet |
Antarc* Antarctic Ice cap |
op_source |
Supplement to: Mackensen, Andreas; Barrera, Enriqueta C; Hubberten, Hans-Wolfgang (1992): Neogene circulation in the southern Indian Ocean: evidence from benthic foraminifers, carbonate data, and stable isotope analyses (Site 751). In: S.W. Wise, JR., R. Schlich, et al., Proceedings of the Ocean Drilling Program, Scientific Results, 120, College Station, TX (Ocean Drilling Program), 867-880, https://doi.org/10.2973/odp.proc.sr.120.169.1992 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.760328 https://doi.org/10.1594/PANGAEA.760328 |
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.760328 https://doi.org/10.2973/odp.proc.sr.120.169.1992 |
_version_ |
1766164061049847808 |