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- W2018056693 abstract "This contribution is focused on a high-resolution cyclostratigraphic investigation by means of an integrated study on the deposits on Zakynthos island (Ionian sea) within the Olduvai polarity subchron (from 1.95 to 1.77 Ma). Accurate palaeomagnetic study has been carried out to specify the precise position of the Olduvai subchron in the Zakynthos city series, named “Citadel” section. New detailed lithological observations have pointed out the presence of turbiditic and laminated facies within clay deposits. Layers corresponding to the Olduvai subchron have been studied in detail for pollen analysis and CaCO3 content in order to evidence responses to the glacial/interglacial cycles. Four climatic cycles have been recognized by pollen and CaCO3 analyses. In order to achieve a correct correlation with the isotopic stages, the δ18O measurements of the Zakynthos's foraminifer Globigerinoides ruber have been provided; they reveal the Artemisia expansions (e.g. steppes) to be contemporaneous with interglacial phases. This behaviour does not conform to the previously evidenced responses of plant associations (especially Artemisia) to the glacial cycles in the western Mediterranean. Hence, the “west Mediterranean model” cannot be upheld for the whole Mediterranean domain. La contribution présentée ici porte sur une étude intégrée de haute résolution des déps de l'île de Zakynthos (mer Ionienne) couvrant le subchron Olduvai (allant de −1,95 à −1,77 Ma). Une étude paléomagnétique serrée avait pour but de préciser la position du subchron Olduvai dans les séries de la ville de Zakynthos, nommés les séries de la “Citadelle”. Une nouvelle étude lithologique sur terrain démontra la présence de faciès turbiditiques dans les dépôts argileux. Les couches correspondant au subchron Olduvai ont fait l'objet d'une étude détaillée au travers d'analyse pollinique et du contenu en CaCO3 afin d'examiner leurs réponses aux cycles glaciaire/interglaciaire. Ainsi, quatre cycles climatiques ont été reconnus. Afin d'assurer une interprétation correcte de ces cycles climatiques en termes de stades isotopiques, les mesures du δ18O ont été réalisés à partir de Globigerinoides ruber de la section Citadelle; ils ont démontré les poussées d'Artemisia (e.g. steppes) corrélatives des interglaciaires. Ce comportement n'est pas conforme avec le modèle ouest méditerranéen précédemment approuvé, dans lequel les association végétales, notamment à Artemisia, répondent aux cycles glaciaires. D'ici, le “modèle ouest méditerranéen” ne pourra plus être retenu pour tout le pourtour méditerranéen." @default.
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- W2018056693 date "1999-01-01" @default.
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- W2018056693 title "Cyclic climatic records during the Olduval subchron (Uppermost Pliocene) on Zakynthos Island (Ionian Sea)" @default.
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