Age tie points and geochemistry of sediment cores from the Antarctic continental margin ...
Few high-latitude terrestrial records document the timing and nature of the Cenozoic "Greenhouse" to "Icehouse" transition. Here we exploit the bulk geochemistry of marine siliciclastic sediments from drill cores on Antarctica's continental margin to extract a unique semiqua...
| Main Authors: | , , , , , , , |
|---|---|
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
PANGAEA
2013
|
| Subjects: | |
| Online Access: | https://dx.doi.org/10.1594/pangaea.816896 https://doi.pangaea.de/10.1594/PANGAEA.816896 |
| Summary: | Few high-latitude terrestrial records document the timing and nature of the Cenozoic "Greenhouse" to "Icehouse" transition. Here we exploit the bulk geochemistry of marine siliciclastic sediments from drill cores on Antarctica's continental margin to extract a unique semiquantitative temperature and precipitation record for Eocene to mid-Miocene (~54-13 Ma). Alkaline elements are strongly enriched in the detrital mineral fraction in fine-grained siliciclastic marine sediments and only occur as trace metals in the biogenic fraction. Hence, terrestrial climofunctions similar to the chemical index of alteration (CIA) can be applied to the alkaline major element geochemistry of marine sediments on continental margins in order to reconstruct changes in precipitation and temperature. We validate this approach by comparison with published paleotemperature and precipitation records derived from fossil wood, leaves, and pollen and find remarkable agreement, despite uncertainties in the calibrations of the different ... : Supplement to: Passchier, Sandra; Bohaty, Steven M; Jiménez-Espejo, Francisco Jose; Pross, Jörg; Röhl, Ursula; van de Flierdt, Tina; Escutia Dotti, Carlota; Brinkhuis, Henk (2013): Early Eocene to middle Miocene cooling and aridification of East Antarctica. Geochemistry, Geophysics, Geosystems, 14 ... |
|---|