Molluscan stable isotope temperature estimates of the southwestern Ross Sea during the Early Oligocene and Early Miocene, CRP-2/2A and CRP-3, Victoria Land basin, Antarctica
Stable isotope analyses of marine bivalve growth increment samples have been used to estimate early Oligocene (29.4 - 31.2) Ma and early Miocene (24.0 Ma) seafloor palaeotemperatures from the southwestern continental margin of the Ross Sea. Measured d18O values average +2.5‰ in the early Miocene and...
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ftnerc:oai:nora.nerc.ac.uk:19811 2023-05-15T13:45:12+02:00 Molluscan stable isotope temperature estimates of the southwestern Ross Sea during the Early Oligocene and Early Miocene, CRP-2/2A and CRP-3, Victoria Land basin, Antarctica Lavelle, M. Fielding, C.R. Hall, M.A. Thomson, M.R.A. 2001 http://nora.nerc.ac.uk/id/eprint/19811/ http://www.mna.it/english/Publications/TAP/TA_pdfs/Volume_08/CRP3_Science_Results/TA_08_439_Lavelle.pdf unknown Terra Antartica Publication Lavelle, M.; Fielding, C.R.; Hall, M.A.; Thomson, M.R.A. 2001 Molluscan stable isotope temperature estimates of the southwestern Ross Sea during the Early Oligocene and Early Miocene, CRP-2/2A and CRP-3, Victoria Land basin, Antarctica. Terra Antartica, 8 (4). 439-444. Publication - Article PeerReviewed 2001 ftnerc 2023-02-04T19:32:30Z Stable isotope analyses of marine bivalve growth increment samples have been used to estimate early Oligocene (29.4 - 31.2) Ma and early Miocene (24.0 Ma) seafloor palaeotemperatures from the southwestern continental margin of the Ross Sea. Measured d18O values average +2.5‰ in the early Miocene and range between +1.26 to +3.24‰ in the early Oligocene. The results show that palaeoceanographic conditions in McMurdo Sound during the mid-Cenozoic were significantly different from those of today. The minimum estimated spring through late summer seasonal temperature range was 3°C during the early Miocene and between 1 and 5°C during the early Oligocene. This compares to the equivalent modern day range of <0.5°C within the sound. Absolute seawater temperatures at <100 m depth were of the order of 5 to 7°C during both time slices, compared to modern day values of -1.4 to -1.9°C in the same area. The results are in broad agreement with early Oligocene Mg/Ca temperature estimates from deep Atlantic foraminifera as well as estimates from local terrestrial palynology and palaeobotany. Article in Journal/Newspaper Antarc* Antarctica McMurdo Sound Ross Sea Victoria Land Natural Environment Research Council: NERC Open Research Archive Ross Sea Victoria Land McMurdo Sound |
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Open Polar |
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Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
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description |
Stable isotope analyses of marine bivalve growth increment samples have been used to estimate early Oligocene (29.4 - 31.2) Ma and early Miocene (24.0 Ma) seafloor palaeotemperatures from the southwestern continental margin of the Ross Sea. Measured d18O values average +2.5‰ in the early Miocene and range between +1.26 to +3.24‰ in the early Oligocene. The results show that palaeoceanographic conditions in McMurdo Sound during the mid-Cenozoic were significantly different from those of today. The minimum estimated spring through late summer seasonal temperature range was 3°C during the early Miocene and between 1 and 5°C during the early Oligocene. This compares to the equivalent modern day range of <0.5°C within the sound. Absolute seawater temperatures at <100 m depth were of the order of 5 to 7°C during both time slices, compared to modern day values of -1.4 to -1.9°C in the same area. The results are in broad agreement with early Oligocene Mg/Ca temperature estimates from deep Atlantic foraminifera as well as estimates from local terrestrial palynology and palaeobotany. |
format |
Article in Journal/Newspaper |
author |
Lavelle, M. Fielding, C.R. Hall, M.A. Thomson, M.R.A. |
spellingShingle |
Lavelle, M. Fielding, C.R. Hall, M.A. Thomson, M.R.A. Molluscan stable isotope temperature estimates of the southwestern Ross Sea during the Early Oligocene and Early Miocene, CRP-2/2A and CRP-3, Victoria Land basin, Antarctica |
author_facet |
Lavelle, M. Fielding, C.R. Hall, M.A. Thomson, M.R.A. |
author_sort |
Lavelle, M. |
title |
Molluscan stable isotope temperature estimates of the southwestern Ross Sea during the Early Oligocene and Early Miocene, CRP-2/2A and CRP-3, Victoria Land basin, Antarctica |
title_short |
Molluscan stable isotope temperature estimates of the southwestern Ross Sea during the Early Oligocene and Early Miocene, CRP-2/2A and CRP-3, Victoria Land basin, Antarctica |
title_full |
Molluscan stable isotope temperature estimates of the southwestern Ross Sea during the Early Oligocene and Early Miocene, CRP-2/2A and CRP-3, Victoria Land basin, Antarctica |
title_fullStr |
Molluscan stable isotope temperature estimates of the southwestern Ross Sea during the Early Oligocene and Early Miocene, CRP-2/2A and CRP-3, Victoria Land basin, Antarctica |
title_full_unstemmed |
Molluscan stable isotope temperature estimates of the southwestern Ross Sea during the Early Oligocene and Early Miocene, CRP-2/2A and CRP-3, Victoria Land basin, Antarctica |
title_sort |
molluscan stable isotope temperature estimates of the southwestern ross sea during the early oligocene and early miocene, crp-2/2a and crp-3, victoria land basin, antarctica |
publisher |
Terra Antartica Publication |
publishDate |
2001 |
url |
http://nora.nerc.ac.uk/id/eprint/19811/ http://www.mna.it/english/Publications/TAP/TA_pdfs/Volume_08/CRP3_Science_Results/TA_08_439_Lavelle.pdf |
geographic |
Ross Sea Victoria Land McMurdo Sound |
geographic_facet |
Ross Sea Victoria Land McMurdo Sound |
genre |
Antarc* Antarctica McMurdo Sound Ross Sea Victoria Land |
genre_facet |
Antarc* Antarctica McMurdo Sound Ross Sea Victoria Land |
op_relation |
Lavelle, M.; Fielding, C.R.; Hall, M.A.; Thomson, M.R.A. 2001 Molluscan stable isotope temperature estimates of the southwestern Ross Sea during the Early Oligocene and Early Miocene, CRP-2/2A and CRP-3, Victoria Land basin, Antarctica. Terra Antartica, 8 (4). 439-444. |
_version_ |
1766216893326163968 |