Stable isotope ratios measured on molluscan from the CRP sediment cores in the Ross Sea, Antarctica
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| Natura: | Dataset Open Access |
| Lingua: | en |
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PANGAEA
2001
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| _version_ | 1867168550244843520 |
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| author | Lavelle, Mark Fielding, Christopher R Hall, Michael A |
| author_facet | Lavelle, Mark Fielding, Christopher R Hall, Michael A |
| collection | Datos científicos de ciencias marinas y ambientales |
| contents | 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 palaeotemperature 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 | Dataset Open Access |
| id | pangaea_https___doi_org_10_1594_PANGAEA_510768 |
| institution | PANGAEA |
| language | en |
| publishDate | 2001 |
| publisher | PANGAEA |
| record_format | pangaea |
| spellingShingle | Stable isotope ratios measured on molluscan from the CRP sediment cores in the Ross Sea, Antarctica Lavelle, Mark Fielding, Christopher R Hall, Michael A 14.2 km at 096° true from Cape Roberts; Cape Roberts Project; Core wireline system; CRP; CRP-2; CRP-2__Campaign; CRP-3; CRP-3__Campaign; CWS; off Cape Roberts, Ross Sea, Antarctica; Ross Sea; Sampling/drilling from ice 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 palaeotemperature 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. |
| title | Stable isotope ratios measured on molluscan from the CRP sediment cores in the Ross Sea, Antarctica |
| topic | 14.2 km at 096° true from Cape Roberts; Cape Roberts Project; Core wireline system; CRP; CRP-2; CRP-2__Campaign; CRP-3; CRP-3__Campaign; CWS; off Cape Roberts, Ross Sea, Antarctica; Ross Sea; Sampling/drilling from ice |
| url | https://doi.org/10.1594/PANGAEA.510768 |