20. LATE CENOZOIC OXYGEN AND CARBON ISOTOPIC CHANGES AT DSDP SITE 284: IMPLICATIONS FOR GLACIAL HISTORY
Stable isotope analyses of the benthonic foraminiferal genus Uvigerina from 39 samples at Site 284, covering an interval from the late Miocene to early Pleistocene (approximately 6 to 1,5 m.y. B.P.), are interpreted in terms of glacially induced isotopic changes in the ocean. The Antarctic ice sheet...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.564.1073 2023-05-15T13:30:41+02:00 20. LATE CENOZOIC OXYGEN AND CARBON ISOTOPIC CHANGES AT DSDP SITE 284: IMPLICATIONS FOR GLACIAL HISTORY Of The Northern Hemisphere Antarctica The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.564.1073 http://www.deepseadrilling.org/29/volume/dsdp29_20.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.564.1073 http://www.deepseadrilling.org/29/volume/dsdp29_20.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.deepseadrilling.org/29/volume/dsdp29_20.pdf text ftciteseerx 2016-01-08T12:10:40Z Stable isotope analyses of the benthonic foraminiferal genus Uvigerina from 39 samples at Site 284, covering an interval from the late Miocene to early Pleistocene (approximately 6 to 1,5 m.y. B.P.), are interpreted in terms of glacially induced isotopic changes in the ocean. The Antarctic ice sheet was present throughout this interval. During the late Miocene its dimensions were less constant than they were during the Pliocene; during the New Zealand Kapitean Stage (latest Miocene; 4.7 to 4.3 m.y. B.P.) it was probably substantially greater than today, and a lesser advance may have occurred about 3.5 m.y. ago within the early Pliocene. Prior to the Kapitean Stage the ice sheet may have been smaller than today, and perhaps less stable. About 2.6 m.y. ago a substantial Northern Hemisphere ice sheet accumulated rather rapidly, and related isotopic and foram-iniferal changes mark the base of the Waipipian Stage of New Zealand. A more extensive Northern Hemisphere glaciation oc-curred during the early Pleistocene (Hautawan Stage), and was of similar extent to the well-documented glaciations of the later Pleisto-cene. The oxygen isotopic changes coincide with changes in plank-tonic foraminiferal faunas considered by Kennett and Vella to repre-sent significant late Cenozoic paleotemperature changes of surface waters. Carbon isotope analyses also document significant changes associated with these events, the cooling in the Kapitean Stage being particularly marked. We propose the term "Pre-glacial Pliocene " to distinguish that part of the Pliocene prior to about 2.6 m.y. B.P., when extensive Northern Hemisphere glaciations had not developed, from the late Pliocene after development of these ice sheets. Text Antarc* Antarctic Ice Sheet Unknown Antarctic The Antarctic New Zealand Kennett ENVELOPE(-65.167,-65.167,-67.117,-67.117) Vella ENVELOPE(9.724,9.724,62.999,62.999) |
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Open Polar |
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Unknown |
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ftciteseerx |
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English |
description |
Stable isotope analyses of the benthonic foraminiferal genus Uvigerina from 39 samples at Site 284, covering an interval from the late Miocene to early Pleistocene (approximately 6 to 1,5 m.y. B.P.), are interpreted in terms of glacially induced isotopic changes in the ocean. The Antarctic ice sheet was present throughout this interval. During the late Miocene its dimensions were less constant than they were during the Pliocene; during the New Zealand Kapitean Stage (latest Miocene; 4.7 to 4.3 m.y. B.P.) it was probably substantially greater than today, and a lesser advance may have occurred about 3.5 m.y. ago within the early Pliocene. Prior to the Kapitean Stage the ice sheet may have been smaller than today, and perhaps less stable. About 2.6 m.y. ago a substantial Northern Hemisphere ice sheet accumulated rather rapidly, and related isotopic and foram-iniferal changes mark the base of the Waipipian Stage of New Zealand. A more extensive Northern Hemisphere glaciation oc-curred during the early Pleistocene (Hautawan Stage), and was of similar extent to the well-documented glaciations of the later Pleisto-cene. The oxygen isotopic changes coincide with changes in plank-tonic foraminiferal faunas considered by Kennett and Vella to repre-sent significant late Cenozoic paleotemperature changes of surface waters. Carbon isotope analyses also document significant changes associated with these events, the cooling in the Kapitean Stage being particularly marked. We propose the term "Pre-glacial Pliocene " to distinguish that part of the Pliocene prior to about 2.6 m.y. B.P., when extensive Northern Hemisphere glaciations had not developed, from the late Pliocene after development of these ice sheets. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Of The Northern Hemisphere Antarctica |
spellingShingle |
Of The Northern Hemisphere Antarctica 20. LATE CENOZOIC OXYGEN AND CARBON ISOTOPIC CHANGES AT DSDP SITE 284: IMPLICATIONS FOR GLACIAL HISTORY |
author_facet |
Of The Northern Hemisphere Antarctica |
author_sort |
Of The |
title |
20. LATE CENOZOIC OXYGEN AND CARBON ISOTOPIC CHANGES AT DSDP SITE 284: IMPLICATIONS FOR GLACIAL HISTORY |
title_short |
20. LATE CENOZOIC OXYGEN AND CARBON ISOTOPIC CHANGES AT DSDP SITE 284: IMPLICATIONS FOR GLACIAL HISTORY |
title_full |
20. LATE CENOZOIC OXYGEN AND CARBON ISOTOPIC CHANGES AT DSDP SITE 284: IMPLICATIONS FOR GLACIAL HISTORY |
title_fullStr |
20. LATE CENOZOIC OXYGEN AND CARBON ISOTOPIC CHANGES AT DSDP SITE 284: IMPLICATIONS FOR GLACIAL HISTORY |
title_full_unstemmed |
20. LATE CENOZOIC OXYGEN AND CARBON ISOTOPIC CHANGES AT DSDP SITE 284: IMPLICATIONS FOR GLACIAL HISTORY |
title_sort |
20. late cenozoic oxygen and carbon isotopic changes at dsdp site 284: implications for glacial history |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.564.1073 http://www.deepseadrilling.org/29/volume/dsdp29_20.pdf |
long_lat |
ENVELOPE(-65.167,-65.167,-67.117,-67.117) ENVELOPE(9.724,9.724,62.999,62.999) |
geographic |
Antarctic The Antarctic New Zealand Kennett Vella |
geographic_facet |
Antarctic The Antarctic New Zealand Kennett Vella |
genre |
Antarc* Antarctic Ice Sheet |
genre_facet |
Antarc* Antarctic Ice Sheet |
op_source |
http://www.deepseadrilling.org/29/volume/dsdp29_20.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.564.1073 http://www.deepseadrilling.org/29/volume/dsdp29_20.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766011373943259136 |