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| Titel |
Technical note: Late Pliocene age control and composite depths at ODP Site 982, revisited |
| VerfasserIn |
N. Khélifi, M. Sarnthein  , B. D. A. Naafs |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 8, no. 1 ; Nr. 8, no. 1 (2012-01-06), S.79-87 |
| Datensatznummer |
250005362
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| Publikation (Nr.) |
 copernicus.org/cp-8-79-2012.pdf |
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| Zusammenfassung |
| Ocean Drilling Program (ODP) Site 982 provided a key sediment section at
Rockall Plateau for reconstructing northeast Atlantic paleoceanography and
monitoring benthic δ18O stratigraphy over the late Pliocene to
Quaternary onset of major Northern Hemisphere glaciation. A renewed
hole-specific inspection of magnetostratigraphic reversals and the addition
of epibenthic δ18O records for short Pliocene sections in holes
982A, B, and C, crossing core breaks in the δ18O record
published for Hole 982B, now imply a major revision of composite core
depths. After tuning to the orbitally tuned reference record LR04, the new
composite δ18O record results in a hiatus, where the Kaena
magnetic subchron might have been lost, and in a significant age reduction for
all proxy records by 130 to 20 ky over the time span 3.2–2.7 million years
ago (Ma). Our study demonstrates the general significance of reliable
composite-depth scales and δ18O stratigraphies in ODP sediment
records for generating ocean-wide correlations in paleoceanography. The new
concept of age control makes the late Pliocene trends in SST (sea surface
temperature) and atmospheric
pCO2 at Site 982 more consistent with various paleoclimate trends
published from elsewhere in the North Atlantic. |
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