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Late Pleistocene oceanographic and depositional variations along the Wilkes Land margin (East Antarctica) reconstructed with geochemical proxies in deep-sea sediments

AuthorsJiménez Espejo, Francisco J.; Presti, Massimo; Kuhn, Gerhard; McKay, Robert M.; Crosta, Xavier; Escutia, Carlota ; Lucchi, Renata G.; Tolotti, Raffaella; Yoshimura, Toshihiro; Ortega Huertas, Miguel; Macrì, Patricia; Caburlotto, Andrea; De Santis, L.
KeywordsWilkes Land
Antarctic Bottom Water
Issue Date1-Jan-2020
PublisherElsevier BV
CitationGlobal and Planetary Change 184
103045 (2020)
AbstractWater masses and depositional environments over the last 500 ka were reconstructed using absolute and relative abundances of lithogenous, biogenous and redox-sensitive elements in four sediment cores from two channel-levee systems of the Wilkes Land continental slope (East Antarctica). Sediments older than the Mid-Bruhnes event (MBE, 430 ka BP) show reduced glacial/interglacial variability in the abundance of elements associated to the terrigenous mineral phases (i.e. Al, Ti, Fe and partly Si). This suggests minor ice-sheet size changes occurred in the Antarctic margin during the pre-MBE “lukewarm” interval. Post-MBE sediments record instead a high variability between glacial and interglacial periods in the concentration of terrigenous and biogenous (i.e. Ca, Ba) elements suggesting larger amplitude changes in both ice-sheet size and ocean conditions toward the gradual establishment of last glacial cycle conditions. Moreover, a marked increase of Mn during the glacial to interglacial transitions, indicates a post-depositional migration of the redox front and re-oxidation of the surface sediment layers linked to major changes in bottom water oxygen conditions associated to Antarctic Bottom Water formation along the margin at the onset of deglaciations.
Publisher version (URL)http://dx.doi.org/10.1016/j.gloplacha.2019.103045
Identifiersdoi: 10.1016/j.gloplacha.2019.103045
issn: 0921-8181
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