A quantitative analysis of calcareous nannofossils and planktonic foraminifera assemblages and geochemical studies were carried out on core C18 (40j00V55UN, 15j09V22UE), recovered near Cape Palinuro (southern Tyrrhenian Sea, Italy). Four radiocarbon ages place the core in the time interval 32–0 ky BP. Coccolithus pelagicus, Gephyrocapsa caribbeanica and Gephyrocapsa mu¨llerae dominated the coccolith assemblages during the glacial period, while foraminifera assemblages show high percentages of Turborotalita quinqueloba and Globorotalia scitula. Calcidiscus leptoporus and Gephyrocapsa oceanica seem to be controlled by nutrient availability; moreover, low percentages of iron seem to influence the distribution of G. oceanica. Low nutrient availability seems to overlap the climatic signal in the distribution of Syracosphaera pulchra. An increase in Umbilicosphaera sibogae and Rhabdosphaera claviger, the occurrence of tropical taxa and an increase in sub tropical and temperate species, among the planktonic foraminifera, characterise the Holocene assemblages. During this period, Globorotalia truncatulinoides reached its highest percentages, testifying to the onset of deep winter convection and vertical mixing that characterise the modern Tyrrhenian Sea.

Late Pleistocene-Holocene paleoclimate and related paleoenvironmental changes as recorded by calcareous nanofossils and planktonic foraminifera assemblages in the southern Tyrrhenian sea (Cape Palinuro, Italy)

AMORE F;MASSA B;
2004

Abstract

A quantitative analysis of calcareous nannofossils and planktonic foraminifera assemblages and geochemical studies were carried out on core C18 (40j00V55UN, 15j09V22UE), recovered near Cape Palinuro (southern Tyrrhenian Sea, Italy). Four radiocarbon ages place the core in the time interval 32–0 ky BP. Coccolithus pelagicus, Gephyrocapsa caribbeanica and Gephyrocapsa mu¨llerae dominated the coccolith assemblages during the glacial period, while foraminifera assemblages show high percentages of Turborotalita quinqueloba and Globorotalia scitula. Calcidiscus leptoporus and Gephyrocapsa oceanica seem to be controlled by nutrient availability; moreover, low percentages of iron seem to influence the distribution of G. oceanica. Low nutrient availability seems to overlap the climatic signal in the distribution of Syracosphaera pulchra. An increase in Umbilicosphaera sibogae and Rhabdosphaera claviger, the occurrence of tropical taxa and an increase in sub tropical and temperate species, among the planktonic foraminifera, characterise the Holocene assemblages. During this period, Globorotalia truncatulinoides reached its highest percentages, testifying to the onset of deep winter convection and vertical mixing that characterise the modern Tyrrhenian Sea.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12070/5078
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