noaa-ocean-11923
Kerguelen Plateau ODP748 Eocene-Oligocene Nannofossil Isotope Data
Villa, G.; Fioroni, C.; Pea, L.; Bohaty, S.M.; Persico, D.
Kerguelen Plateau ODP748 Eocene-Oligocene Nannofossil Isotope Data
2011-08-19
NCDC-Paleoclimatology
ONLINE Files
Pending
https://www.ncdc.noaa.gov/paleo/study/11923
Investigator
G.
Villa
Investigator
C.
Fioroni
Investigator
L.
Pea
Investigator
S.M.
Bohaty
Investigator
D.
Persico
earth science
paleoclimate
paleoceanography
depth,null,null,meter,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 13C,calcareous nannofossil,null,per mil VPDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
age,null,null,million years ago,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleoceanography
delta 18O,calcareous nannofossil,null,per mil VPDB,null,paleoceanography,null,null,N,null
earth science
paleoclimate
paleocean
oxygen isotopes
earth science
paleoclimate
paleocean
carbon isotopes
geoscientificInformation
42520000 cal yr BP
23151000 cal yr BP
Complete
-58.441
-58.441
78.9981
78.9981
-1290
-1290
Ocean
Southern Ocean
ODP748>LATITUDE -58.441>LONGITUDE 78.9981
None
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English
DOC/NOAA/NESDIS/NCEI
National Centers for Environmental Information, NESDIS, NOAA, U.S. Department of Commerce
https://www.ncdc.noaa.gov/data-access/paleoclimatology-data
DATA Center Contact
Bruce
Bauer
bruce.a.bauer@noaa.gov
paleo@noaa.gov
303-497-6280
303-497-6513
325 Broadway, E/NE31
Boulder
CO
80305-3328
USA
online
ASCII
Villa, G., C. Fioroni, L. Pea, S.M. Bohaty, and D. Persico. 2008.
Middle Eocene - late Oligocene climate variability:
calcareous nannofossil response at Kerguelen Plateau, Site 748.
Marine Micropaleontology, Vol. 69, Issue 2, pp. 173-192, October 2008.
doi:10.1016/j.marmicro.2008.07.006
A major deterioration in global climate occurred through the
Eocene-Oligocene time interval, characterized by long-term cooling
in both terrestrial and marine environments. During this long-term
cooling trend, however, recent studies have documented several
short-lived warming and cooling phases. In order to further
investigate high-latitude climate during these events, we developed
a high-resolution calcareous nannofossil record from ODP Site 748
Hole B for the interval spanning the late middle Eocene to the late
Oligocene (~42 to 26 Ma). The primary goals of this study were to
construct a detailed biostratigraphic record and to use nannofossil
assemblage variations to interpret short-term changes in surface-water
temperature and nutrient conditions. The principal nannofossil
assemblage variations are identified using a temperate-warm-water
taxa index (Twwt), from which three warming and five cooling events
are identified within the middle Eocene to the earliest Oligocene
interval. Among these climatic trends, the cooling event at ~39 Ma
(Cooling Event B) is recorded here for the first time. Variations
in fine-fraction d18O values at Site 748 are associated with changes
in the Twwt index, supporting the idea that significant short-term
variability in surface-water conditions occurred in the Kerguelen
Plateau area during the middle and late Eocene. Furthermore,
ODP Site 748 calcareous nannofossil paleoecology confirms the
utility of these microfossils for biostratigraphic, paleoclimatic,
and paleoceanographic reconstructions at Southern Ocean sites
during the Paleogene.
STUDY NOTES: Stable isotope data on calcareous nannofossils from marine sediments
sampled in Kerguelen Plateau ODP Core 748, for the Eocene and Oligocene
(~42 - ~23 MYrBP).
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/villa2008/villa2008.txt
GET DATA
https://www1.ncdc.noaa.gov/pub/data/paleo/contributions_by_author/villa2008/villa2008.xls
USA/NOAA
DIF
Version 9.8.4
2018-12-11
2018-12-11