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| Titel |
Bulk sediment geochemistry as a tool in palaeoclimate studies; preliminary results from shipboard analyses of IODP Expedition 318 |
| VerfasserIn |
Tina van de Flierdt, Francisco J. Jiménez-Espejo, Carlota Escutia, Henk Brinkhuis, Adam Klaus, Expedition 318 Scientists |
| 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 |
250053795
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| Zusammenfassung |
| Understanding the evolution and dynamics of the Antarctic cryosphere, from its inception
during the Eocene–Oligocene transition (Â 34 Ma) through the significant subsequent periods
of likely coupled climate and atmospheric greenhouse gas changes, is not only of
major scientific interest but also is of great importance for society. Drilling the
Antarctic Wilkes Land margin was designed to provide a long-term record of the
sedimentary archives along an inshore to offshore transect of Cenozoic Antarctic
glaciation and its intimate relationships with global climatic and oceanographic
change.
Material recovered during IODP Expedition 318 included an unprecedented ultrahigh
resolution Holocene core, continuous Miocene and Oligocene sections, as well as some
Eocene strata. We used the shipboard analytical facilities of the JOIDES Resolution to obtain
high precision bulk sediment major and trace element data on most representative
lithologies. In detail we measured SiO2, Al2O3, TiO2, K2O, CaO, Na2O, MgO, Fe2O3,
P2O5, Sr, Ba, Sc, Co, and V data. The results can be used to constrain sedimentary
regimes, primary marine productivity, diagenesis, and detrital inputs through the
Cenozoic. In addition the chemical index of alteration (CIA = [Al2O3/(Al2O3 +
CaO* + K2O + Na2O)]) allows to reconstruct the chemical/physical weathering
conditions on the continent. Overall the data allow distinguishing geochemical intervals
that broadly correlate with lithostratigraphic observations and interpretations, and
provide a valuable starting point for more detailed geochemical investigations. |
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