24. FINE-FRACTION CARBONATE OXYGEN AND CARBON ISOTOPE RESULTS FROM SITE 704: IMPLICATIONS FOR MOVEMENT OF THE POLAR FRONT DURING THE LATE PLIOCENE1
Ocean Drilling Program Site 704 in the subantarctic South Atlantic was drilled to investigate the response of the Southern Ocean to climatic and Oceanographic developments during the late Neogene. Stable oxygen and carbon isotopes of fine-fraction (<63 µm) carbonate were analyzed to supplement si...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.605.6293 2023-05-15T17:14:58+02:00 24. FINE-FRACTION CARBONATE OXYGEN AND CARBON ISOTOPE RESULTS FROM SITE 704: IMPLICATIONS FOR MOVEMENT OF THE POLAR FRONT DURING THE LATE PLIOCENE1 Gregory A. Mead David A. Hodell Daniel W. Muller Paul F. Ciesielski The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.605.6293 http://www-odp.tamu.edu/publications/114_SR/VOLUME/CHAPTERS/sr114_24.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.605.6293 http://www-odp.tamu.edu/publications/114_SR/VOLUME/CHAPTERS/sr114_24.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www-odp.tamu.edu/publications/114_SR/VOLUME/CHAPTERS/sr114_24.pdf Ocean Dr text ftciteseerx 2016-01-08T14:14:31Z Ocean Drilling Program Site 704 in the subantarctic South Atlantic was drilled to investigate the response of the Southern Ocean to climatic and Oceanographic developments during the late Neogene. Stable oxygen and carbon isotopes of fine-fraction (<63 µm) carbonate were analyzed to supplement similar analyses of benthic and planktonic foraminifers. The fine fraction is generally composed primarily of coccoliths, and isotopic analyses of the fine fraction were made to complement the foraminiferal analyses. The isotopic curves thus generated suggest paleoceanographic changes not recognizable by the use of benthic and planktonic foraminifers alone. The global Chron 6 carbon isotope shift, found at 253-244 mbsf (6.39-6.0 Ma) at Site 704 in the planktonic and benthic record, is seen in the fine-fraction δ13C record as a gradual decrease from 255 mbsf (6.44 Ma) to 210 mbsf (4.24 Ma). At 170 mbsf, mean δ 1 8 θ values of Neogloboquadrina pachyderma increase by 0.6°/oo-0.7°/oo (Hodell and Ciesielski, this volume), reflecting decreased temperature and increased continental ice volume. Accumulation rates increase by 3.3 times above this depth (which corresponds to an age of 2.5 Ma), suggesting increased upwelling and biologic productivity. Text Neogloboquadrina pachyderma Southern Ocean Unknown Southern Ocean |
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English |
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Ocean Dr |
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Ocean Dr Gregory A. Mead David A. Hodell Daniel W. Muller Paul F. Ciesielski 24. FINE-FRACTION CARBONATE OXYGEN AND CARBON ISOTOPE RESULTS FROM SITE 704: IMPLICATIONS FOR MOVEMENT OF THE POLAR FRONT DURING THE LATE PLIOCENE1 |
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Ocean Dr |
description |
Ocean Drilling Program Site 704 in the subantarctic South Atlantic was drilled to investigate the response of the Southern Ocean to climatic and Oceanographic developments during the late Neogene. Stable oxygen and carbon isotopes of fine-fraction (<63 µm) carbonate were analyzed to supplement similar analyses of benthic and planktonic foraminifers. The fine fraction is generally composed primarily of coccoliths, and isotopic analyses of the fine fraction were made to complement the foraminiferal analyses. The isotopic curves thus generated suggest paleoceanographic changes not recognizable by the use of benthic and planktonic foraminifers alone. The global Chron 6 carbon isotope shift, found at 253-244 mbsf (6.39-6.0 Ma) at Site 704 in the planktonic and benthic record, is seen in the fine-fraction δ13C record as a gradual decrease from 255 mbsf (6.44 Ma) to 210 mbsf (4.24 Ma). At 170 mbsf, mean δ 1 8 θ values of Neogloboquadrina pachyderma increase by 0.6°/oo-0.7°/oo (Hodell and Ciesielski, this volume), reflecting decreased temperature and increased continental ice volume. Accumulation rates increase by 3.3 times above this depth (which corresponds to an age of 2.5 Ma), suggesting increased upwelling and biologic productivity. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Gregory A. Mead David A. Hodell Daniel W. Muller Paul F. Ciesielski |
author_facet |
Gregory A. Mead David A. Hodell Daniel W. Muller Paul F. Ciesielski |
author_sort |
Gregory A. Mead |
title |
24. FINE-FRACTION CARBONATE OXYGEN AND CARBON ISOTOPE RESULTS FROM SITE 704: IMPLICATIONS FOR MOVEMENT OF THE POLAR FRONT DURING THE LATE PLIOCENE1 |
title_short |
24. FINE-FRACTION CARBONATE OXYGEN AND CARBON ISOTOPE RESULTS FROM SITE 704: IMPLICATIONS FOR MOVEMENT OF THE POLAR FRONT DURING THE LATE PLIOCENE1 |
title_full |
24. FINE-FRACTION CARBONATE OXYGEN AND CARBON ISOTOPE RESULTS FROM SITE 704: IMPLICATIONS FOR MOVEMENT OF THE POLAR FRONT DURING THE LATE PLIOCENE1 |
title_fullStr |
24. FINE-FRACTION CARBONATE OXYGEN AND CARBON ISOTOPE RESULTS FROM SITE 704: IMPLICATIONS FOR MOVEMENT OF THE POLAR FRONT DURING THE LATE PLIOCENE1 |
title_full_unstemmed |
24. FINE-FRACTION CARBONATE OXYGEN AND CARBON ISOTOPE RESULTS FROM SITE 704: IMPLICATIONS FOR MOVEMENT OF THE POLAR FRONT DURING THE LATE PLIOCENE1 |
title_sort |
24. fine-fraction carbonate oxygen and carbon isotope results from site 704: implications for movement of the polar front during the late pliocene1 |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.605.6293 http://www-odp.tamu.edu/publications/114_SR/VOLUME/CHAPTERS/sr114_24.pdf |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Neogloboquadrina pachyderma Southern Ocean |
genre_facet |
Neogloboquadrina pachyderma Southern Ocean |
op_source |
http://www-odp.tamu.edu/publications/114_SR/VOLUME/CHAPTERS/sr114_24.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.605.6293 http://www-odp.tamu.edu/publications/114_SR/VOLUME/CHAPTERS/sr114_24.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766073084650979328 |