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

Autor: Raffaella Tolotti, Renata G. Lucchi, Carlota Escutia, Toshihiro Yoshimura, Massimo Presti, Xavier Crosta, Robert M. McKay, Patrizia Macrì, Francisco J. Jiménez-Espejo, Laura De Santis, Andrea Caburlotto, Gerhard Kuhn, Miguel Ortega Huertas
Přispěvatelé: Japan Agency for Marine-Earth Science and Technology (JAMSTEC), Institute for Biomechanics, Institute of integrative biology (Liverpool), University of Liverpool, Environnements et Paléoenvironnements OCéaniques (EPOC), Observatoire aquitain des sciences de l'univers (OASU), Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Sciences et Technologies - Bordeaux 1-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS), Istituto Nazionale di Geofisica e Vulcanologia - Sezione di Roma (INGV), Istituto Nazionale di Geofisica e Vulcanologia, Ministerio de Ciencia e Innovación (España), European Commission
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Water mass
010504 meteorology & atmospheric sciences
Geochemistry
Wilkes Land
02 engineering and technology
Oceanography
01 natural sciences
Sedimentary depositional environment
Bottom water
Redox
Glaciation
0202 electrical engineering
electronic engineering
information engineering
14. Life underwater
Glacial period
ComputingMilieux_MISCELLANEOUS
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography
0105 earth and related environmental sciences
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean
Atmosphere
Global and Planetary Change
geography
Manganese
geography.geographical_feature_category
Terrigenous sediment
Continental shelf
Antarctic bottom water
020206 networking & telecommunications
Antarctic Bottom Water
13. Climate action
[SDU.STU.CL]Sciences of the Universe [physics]/Earth Sciences/Climatology
Interglacial
Geology
Zdroj: Global and Planetary Change
Global and Planetary Change, Elsevier, 2019, pp.103045. ⟨10.1016/j.gloplacha.2019.103045⟩
Digital.CSIC. Repositorio Institucional del CSIC
instname
ISSN: 0921-8181
DOI: 10.1016/j.gloplacha.2019.103045⟩
Popis: Water 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.
All scientific participants are thanked for shipboard collaboration in the data collection and post-cruise discussions and sample management. U1361 samples were provided by the Integrated Ocean Drilling Programme, Expedition 318. WEGA and MOGAM core samples were provided by the Italian “Programma Nazionale di Ricerche in Antartide”, Antarctic Expeditions 2000 and 2006. MD03-2603 core samples were provided by the Images X-CADO programme. MP acknowledges the EC Human Resources and Mobility Activity - Marie Curie European Re-Integration Grant (ERG) “HoloSed”, Contract 039566. CE and FJJE acknowledge funding from the Ministry of Science and Innovation Grants CTM2017-89711-C2-1-P co-financed by the European Regional Development Fund (FEDER). FJJE acknowledges JAMSTEC-MEXT support. RM was funded by the Royal Society Te Apārangi (NZ) Marsden Fund (18-VUW-089). CT-Scanning was carried out at the Division of Petrophysics of ENI, San Donato Milanese. This paper is a contribution to the SCAR PAIS Programme.
Databáze: OpenAIRE
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