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Revue de micropaléontologie
Volume 61, n° 2
pages 81-96 (juillet 2018)
Doi : 10.1016/j.revmic.2018.05.001
Wilkes Land Late Pleistocene diatom age model: From bio-events to quantitative biostratigraphy
 

R. Tolotti a, , M.A. Bárcena b, Patrizia Macrì d, A. Caburlotto c, M.C. Bonci a, Laura De Santis c, F. Donda c, Nicola Corradi a, X. Crosta e
a Dipartimento di Scienze della Terra, dell’Ambiente e della Vita (DISTAV), Corso Europa 26, 16132 Genova, Italy 
b Depto. De Geología y Paleontología, Facultad de Ciencias, Universidad de Salamanca, 37008 Salamanca, Spain 
c Istituto Nazionale di Oceanografia e Geofisica Sperimentale, Borgo Grotta Gigante 42/c, 34010 Sgonico, Trieste, Italy 
d Istituto Nazionale di Geofisica e Vulcanologia, Via di Vigna Murata 605, 00143 Roma, Italy 
e EPOC, UMR CNRS 5805, Université de Bordeaux I, 33615 Pessac, France 

Corresponding author.
Abstract

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 0.8Ma, from the Mid Pleistocene Transition (MPT) to the Early Holocene. A hiatus includingMarine 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.

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Keywords : Late Pleistocene, Quantitative Biostratigraphy, Diatom Biomarkers, Paleomagnetic dataset, Mid Pleistocene Transition, Matuyama-Brunhes Transition




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