Stable isotope composition and ice rafted debris in early Late Pliocene sediments from Maud Rise, South Atlantic
We have conducted an integrated study of ice-rafted debris (IRD) and oxygen isotopes (measured on Cibicides, Globigerina bulloides, and Neogloboquadrina pachyderma, using identical samples). We used samples from the early Late Pliocene Gauss Chron from ODP Site 114-704 on the Meteor Rise in the suba...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.681724 2023-05-15T13:42:09+02:00 Stable isotope composition and ice rafted debris in early Late Pliocene sediments from Maud Rise, South Atlantic Warnke, Detlef A Marzo, Bonnie Hodell, David A LATITUDE: -46.879000 * LONGITUDE: 7.420800 * DATE/TIME START: 1987-04-25T13:30:00 * DATE/TIME END: 1987-04-26T06:54:00 1996-02-11 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.681724 https://doi.org/10.1594/PANGAEA.681724 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.681724 https://doi.org/10.1594/PANGAEA.681724 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Warnke, Detlef A; Marzo, Bonnie; Hodell, David A (1996): Major deglaciation of east Antarctica during the early Late Pliocene? Not likely from a marine perspective. Marine Micropaleontology, 27(1-4), 237-251, https://doi.org/10.1016/0377-8398(95)00064-X 114-704A DRILL Drilling/drill rig Joides Resolution Leg114 Ocean Drilling Program ODP South Atlantic Ocean Dataset 1996 ftpangaea https://doi.org/10.1594/PANGAEA.681724 https://doi.org/10.1016/0377-8398(95)00064-X 2023-01-20T07:31:07Z We have conducted an integrated study of ice-rafted debris (IRD) and oxygen isotopes (measured on Cibicides, Globigerina bulloides, and Neogloboquadrina pachyderma, using identical samples). We used samples from the early Late Pliocene Gauss Chron from ODP Site 114-704 on the Meteor Rise in the subantarctic South Atlantic. During the early Gauss Chron, the oxygen isotopic ratios are generally up to 0.5‰-0.6‰ less than their respective Holocene values. The lowest values in this record can accommodate a warming of about 2.5°C or a sea-level rise of about 50 m, but not both, and probably result from some warming and a small reduction in global ice volume. Starting with isotope stage MG2 [ 3.23 Ma on the Berggren et al. ( 1985) time scale; 3.38 on the Shackleton et al. ( 1995b) time scale] oxygen-isotopic values generally increase (and oscillate about a Holocene mean). The first significant IRD appears at the same time. There is a subsequent increase in IRD amounts upsection. In order to reach the site, this material must have been transported by large, tabular icebergs derived from Antarctic ice shelves or ice tongues, similar to occasional, large modern icebergs. This combined record suggests strongly that the Antarctic ice sheet was essentially intact; some warming at the drill site is indicated, but not a major reduction in ice-volume on Antarctica. Dataset Antarc* Antarctic Antarctica Ice Sheet Ice Shelves Iceberg* Neogloboquadrina pachyderma South Atlantic Ocean PANGAEA - Data Publisher for Earth & Environmental Science Antarctic The Antarctic Shackleton Maud Rise ENVELOPE(3.000,3.000,-66.000,-66.000) ENVELOPE(7.420800,7.420800,-46.879000,-46.879000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
114-704A DRILL Drilling/drill rig Joides Resolution Leg114 Ocean Drilling Program ODP South Atlantic Ocean |
spellingShingle |
114-704A DRILL Drilling/drill rig Joides Resolution Leg114 Ocean Drilling Program ODP South Atlantic Ocean Warnke, Detlef A Marzo, Bonnie Hodell, David A Stable isotope composition and ice rafted debris in early Late Pliocene sediments from Maud Rise, South Atlantic |
topic_facet |
114-704A DRILL Drilling/drill rig Joides Resolution Leg114 Ocean Drilling Program ODP South Atlantic Ocean |
description |
We have conducted an integrated study of ice-rafted debris (IRD) and oxygen isotopes (measured on Cibicides, Globigerina bulloides, and Neogloboquadrina pachyderma, using identical samples). We used samples from the early Late Pliocene Gauss Chron from ODP Site 114-704 on the Meteor Rise in the subantarctic South Atlantic. During the early Gauss Chron, the oxygen isotopic ratios are generally up to 0.5‰-0.6‰ less than their respective Holocene values. The lowest values in this record can accommodate a warming of about 2.5°C or a sea-level rise of about 50 m, but not both, and probably result from some warming and a small reduction in global ice volume. Starting with isotope stage MG2 [ 3.23 Ma on the Berggren et al. ( 1985) time scale; 3.38 on the Shackleton et al. ( 1995b) time scale] oxygen-isotopic values generally increase (and oscillate about a Holocene mean). The first significant IRD appears at the same time. There is a subsequent increase in IRD amounts upsection. In order to reach the site, this material must have been transported by large, tabular icebergs derived from Antarctic ice shelves or ice tongues, similar to occasional, large modern icebergs. This combined record suggests strongly that the Antarctic ice sheet was essentially intact; some warming at the drill site is indicated, but not a major reduction in ice-volume on Antarctica. |
format |
Dataset |
author |
Warnke, Detlef A Marzo, Bonnie Hodell, David A |
author_facet |
Warnke, Detlef A Marzo, Bonnie Hodell, David A |
author_sort |
Warnke, Detlef A |
title |
Stable isotope composition and ice rafted debris in early Late Pliocene sediments from Maud Rise, South Atlantic |
title_short |
Stable isotope composition and ice rafted debris in early Late Pliocene sediments from Maud Rise, South Atlantic |
title_full |
Stable isotope composition and ice rafted debris in early Late Pliocene sediments from Maud Rise, South Atlantic |
title_fullStr |
Stable isotope composition and ice rafted debris in early Late Pliocene sediments from Maud Rise, South Atlantic |
title_full_unstemmed |
Stable isotope composition and ice rafted debris in early Late Pliocene sediments from Maud Rise, South Atlantic |
title_sort |
stable isotope composition and ice rafted debris in early late pliocene sediments from maud rise, south atlantic |
publisher |
PANGAEA |
publishDate |
1996 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.681724 https://doi.org/10.1594/PANGAEA.681724 |
op_coverage |
LATITUDE: -46.879000 * LONGITUDE: 7.420800 * DATE/TIME START: 1987-04-25T13:30:00 * DATE/TIME END: 1987-04-26T06:54:00 |
long_lat |
ENVELOPE(3.000,3.000,-66.000,-66.000) ENVELOPE(7.420800,7.420800,-46.879000,-46.879000) |
geographic |
Antarctic The Antarctic Shackleton Maud Rise |
geographic_facet |
Antarctic The Antarctic Shackleton Maud Rise |
genre |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelves Iceberg* Neogloboquadrina pachyderma South Atlantic Ocean |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet Ice Shelves Iceberg* Neogloboquadrina pachyderma South Atlantic Ocean |
op_source |
Supplement to: Warnke, Detlef A; Marzo, Bonnie; Hodell, David A (1996): Major deglaciation of east Antarctica during the early Late Pliocene? Not likely from a marine perspective. Marine Micropaleontology, 27(1-4), 237-251, https://doi.org/10.1016/0377-8398(95)00064-X |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.681724 https://doi.org/10.1594/PANGAEA.681724 |
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.681724 https://doi.org/10.1016/0377-8398(95)00064-X |
_version_ |
1766163283468877824 |