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. and 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.


Author Lavelle, M.
Fielding, C. R.
Hall, M. A.
Thomson, M. R. A.
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
Journal name Terra Antartica   Check publisher's open access policy
ISSN 1122-8628
Publication date 2001
Sub-type Article (original research)
Volume 8
Issue 4
Start page 439
End page 444
Total pages 6
Editor Peter J Barrett
Carlo Alberto Ricci
Place of publication Siena
Publisher Terra Antartica Publication
Collection year 2001
Language eng
Subject C1
260301 Geochronology and Isotope Geochemistry
780104 Earth sciences
0499 Other Earth Sciences
Abstract 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 δ18O 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.
Keyword growth rate
Miocene
Oligocene
paleoceanography
paleotemperature
stable isotope
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collection: Earth Systems Science Computational Centre Publications
 
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Created: Tue, 14 Aug 2007, 15:27:02 EST