Evolución paleoambiental del tránsito Eoceno-Oligoceno en el Atlántico sur (Sondeo 1263) basada en foraminíferos bentónicos

Fenero, Raquel; Thomas, Ellen; Alegret, Laia; Molina, Eustoquio

Paleoenvironmental evolution of the Eocene-Oligocene transition in the South Atlantic (Site 1263) based on benthic foraminifera

Author

Fenero, Raquel; Thomas, Ellen; Alegret, Laia; Molina, Eustoquio
Publication Date

2010
Publisher

Universidad de Huelva
Abstract

Quantitative análisis of benthic foraminiferal assemblages at South Atlantic Site 1263 provided information about paleobathymetry and changes in benthic foraminiferal faunas across the Eocene-Oligocene boundary. Benthic foraminifera indicate an upper abyssal depth (~ 2000 m). Changes in relative abundances of Epistominella exigua, Epistominella vitrea, Globocassidulina subglobosa and Nuttallides umbonifera, probably indicate variability in seasonality of export productivity, bottom current intensity and carbonate corrosivity. The transition into glaciation event Oi-1 is characterized by highly seasonal productivity, Oi-1 itself by less variability, probably at fairly active bottom currents
URI

http://hdl.handle.net/10272/7471

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Fichero	Tamaño	Formato	Ver	Description
Evolucion-paleoambiental.pdf	609.4Kb	PDF	View/Open

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Geogaceta -- Nº 49, (2010)

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Evolución paleoambiental del tránsito Eoceno-Oligoceno en el Atlántico sur (Sondeo 1263) basada en foraminíferos bentónicos

Paleoenvironmental evolution of the Eocene-Oligocene transition in the South Atlantic (Site 1263) based on benthic foraminifera

Author

Fenero, Raquel; Thomas, Ellen; Alegret, Laia; Molina, Eustoquio

Publication Date

2010

Publisher

Universidad de Huelva

Abstract

Quantitative análisis of benthic foraminiferal assemblages at South Atlantic Site 1263 provided information about paleobathymetry and changes in benthic foraminiferal faunas across the Eocene-Oligocene boundary. Benthic foraminifera indicate an upper abyssal depth (~ 2000 m). Changes in relative abundances of Epistominella exigua, Epistominella vitrea, Globocassidulina subglobosa and Nuttallides umbonifera, probably indicate variability in seasonality of export productivity, bottom current intensity and carbonate corrosivity. The transition into glaciation event Oi-1 is characterized by highly seasonal productivity, Oi-1 itself by less variability, probably at fairly active bottom currents