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| Titel |
New insights in the onset of Antarctic glaciation |
| VerfasserIn |
Alexander J. P. Houben, Steven M. Bohaty, Stefan Schouten, Gert-Jan Reichart, Appy Sluijs, Henk Brinkhuis |
| Konferenz |
EGU General Assembly 2011
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250056882
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| Zusammenfassung |
| The Eocene-Oligocene Transition (EOT, ~34 Ma) marks the onset of major Cenozoic
glaciation through the relatively rapid establishment of Antarctic ice-sheets. Deep-sea oxygen
isotope records across the EOT are characterized by a ~400 kyr spaced two-step increase in
values, reflecting both cooling and cryosphere expansion. In order to disentangle
these, we have reconstructed sea surface temperatures (SSTs) using TEX86and
UK’37 paleothermometry on the relatively complete sequence of Deep Sea Drilling
Project (DSDP) Site 511 in the southwest Atlantic Ocean. The results illustrate that
cooling is largely confined to the first (EOT-1 or precursor) shift, whereas only
minor cooling is apparent in conjunction with the second, most prominent shift,
the ‘Oligocene isotope event -1’ (Oi-1). Regarding continental ice formation, this
implies that mainly the Oi-1 proper reflects the principal time of accumulation. |
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