Paleoceanographic implications of smaller benthic and planktonic foraminifera from the Eocene Pazin Basin (Coastal Dinarides,Croatia) |
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Authors: | Sanja Zivkovic Ljubomir Babi? |
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Institution: | (1) Institute of Geology and Paleontology, Faculty of Science, University of Zagreb, Kralja Zvonimira 8, HR-10000 Zagreb, Croatia |
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Abstract: | Summary Smaller benthic and planktonic foraminifera from the clastic sediments of the Pazin Basin (Istria, Croatia) were studied in
order to obtain more data about paleoceanographic conditions that existed in the Middle Eocene Dinaric foreland basin. The
succession investigated corresponds to the Middle Eocene planktonic foraminiferal zones Globigerapsis kugleri/Morozovella aragonensis (P11), Morozovella lehneri (P12), and Globigerapsis beckmanni (P13). Benthic foraminiferal assemblages from the clastic succession are dominated by epifaunal trochospiral genera suggesting
oligotrophic to mesotrophic conditions and moderately oxygenated bottom waters. Planktonic foraminiferal assemblages indicate
mesotrophic to eutrophic conditions of the surface waters, with increased eutrophication in the upper part of the section.
Water depth, based on the ratio between planktonic and epifaunal benthic foraminifera and on the recognized species of cosmopolitan
benthic foraminifera, was estimated to have been between about 900 and 1200 m. The basin was elongated and open to marine
currents on both sides allowing good circulation and ventilation of the bottom water. |
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Keywords: | Smaller benthic foraminifera planktonic foraminifera paleoecology paleoceanography Middle |
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