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Cyclic changes in oxygenation based on foraminiferal microhabitats; early-middle Pleistocene, Lucania Basin (southern Italy)

Simona Stefanelli
Cyclic changes in oxygenation based on foraminiferal microhabitats; early-middle Pleistocene, Lucania Basin (southern Italy)
Journal of Micropalaeontology (May 2004) 23, Part 1: 81-95

Abstract

In the Pleistocene Montalbano Jonico composite section (southern Italy) the microhabitat preferences of the benthic foraminifera have been determined by comparison with data on living forms. The stratigraphic distribution of the different living positions seems to be related to the cyclic oxygen fluctuations recorded in the succession. In the high-oxygenated phases, when the oxygenated zone within the sediment column is wide, the assemblages show a distinct vertical microhabitat distribution. In the low-oxygenated phases, when the minor oxygen availability at the bottom-water interface reduces the oxygen penetration within the sediment, infaunal microhabitat is the preferred living depth. In order to quantify the oxygen fluctuations recorded in the succession, a palaeo-oxygen curve is reconstructed testing Kaiho's benthic foraminiferal oxygen index (BFOI) in the equation: y=1.686+0.033337x. In general, good correlations are observed between the dissolved oxygen regimes and the benthic assemblage composition. The low-oxygenated phases are identified with the low-medium oxic regime and the high-oxygenated phases with the high oxic regime. In the deeper part of the composite section, oxygen has played an important role on the foraminiferal assemblage composition. In contrast, in the shallower part, a combination of oxygen and sea-level changes regulates the distribution and composition of the assemblages.


ISSN: 0262-821X
EISSN: 2041-4978
Serial Title: Journal of Micropalaeontology
Serial Volume: 23, Part 1
Title: Cyclic changes in oxygenation based on foraminiferal microhabitats; early-middle Pleistocene, Lucania Basin (southern Italy)
Author(s): Stefanelli, Simona
Affiliation: University of Bari, Geology and Geophysics Department, Bari, Italy
Pages: 81-95
Published: 200405
Text Language: English
Publisher: British Micropalaeontological Society, London, United Kingdom
References: 50
Accession Number: 2008-008870
Categories: Quaternary geology
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Includes appendix
Illustration Description: illus. incl. strat. cols., geol. sketch map
N40°19'60" - N40°19'60", E16°40'00" - E16°40'00"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 200804
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