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

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 paleoclim...

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Bibliographic Details
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
Description
Summary: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

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