Wilkes Land Late Pleistocene diatom age model: From bio-events to quantitative biostratigraphy

• Published in: Revue de Micropaléontologie
• Main Authors: Tolotti, R., Bárcena, M.A., Macrì, Patrizia, Caburlotto, A., Bonci, Maria Cristina, De Santis, Laura, Donda, Federica, Corradi, Nicola, Crosta, X.
• Other Authors: #PLACEHOLDER_PARENT_METADATA_VALUE#, Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Roma2, Roma, Italia
• Format: Article in Journal/Newspaper
• Language: English
• Published: 2018
• Subjects: Late Pleistocene; Quantitative Biostratigraphy; Matuyama-Brunhes Transition; Mid Pleistocene Transition; 04.04. Geology; East Antarctica; Wilkes Land; Antarc*; Antarctica
• Online Access: http://hdl.handle.net/2122/12437; https://doi.org/10.1016/j.revmic.2018.05.001

A new method merges conventional and quantitative biostratigraphic approaches, supported by magnetic polarity data, to develop a chronological framework for sediment core MD03-2595 retrieved on the continental rise off Wilkes Land, East Antarctica before proceeding to paleoceanographic and paleoclimatic analysis. This combined method helped to identify climatic cycles, highlight stratigraphic discontinuities and reworking, and assess regional sedimentological and diatom biostratigraphic evolution. Core MD03-2595 spans the last 0.8 Ma, from the Mid Pleistocene Transition (MPT) to the Early Holocene. A hiatus including Marine Isotope Stages (MIS) 19, 18 and 17 was identified, and a decreasing trend in sediment accumulation rates from MIS 16 to the Holocene was observed. This quantitative diatom biostratigraphic dataset, placed in its own sedimentological and paleomagnetic context, provides new information regarding the paleobiogeographic distribution and ecological responses of biostratigraphically significant diatom species, such as Thalassiosira elliptipora and T. fasciculata, for the Matuyama–Brunhes (M–B) transition, and Actinocyclus ingens, Hemidiscus karstenii and Rouxia spp. for the middle and late Pleistocene diatom biozonation. Published 81-96 1A. Geomagnetismo e Paleomagnetismo N/A or not JCR