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Palaeoceanography of the Miocene (Tortonian) deposits of the Pre-Apulian zone, western Greece, as recorded by foraminifer and stable isotope records

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Abstract

An integrated faunal and geochemical dataset has been generated by the study of a late Miocene (early Tortonian) sedimentary section outcropping at Manassi, Levkas Island (eastern Mediterranean). Quantitative analysis of benthic foraminifers from the 25-m-thick section indicates changes of bottom palaeoecological conditions in this part of the eastern Mediterranean, during the analyzed time interval. Benthic foraminifer assemblages are typical of a bathyal environment and testify to relatively oxygenated conditions with low to moderate food supply alternating with periods with an increase in organic matter content. The long-term palaeoceanographic analyses indicate an anti-estuarine circulation model based on the benthic foraminifer and stable isotope results, which evolved in a strong estuarine circulation. The positive relationship existing between the plankton δ18O and δ13C, in most of the record, agrees well with the hypothesis of a variable contribution of runoff. In three stratigraphic levels, samples record heavy bottom water δ18O and δ13C values and light surface δ18O values, representing a wet, warm, estuarine climate with a stratified water column. In two stratigraphic levels, samples have depleted δ13C and δ18O values for both surface and bottom waters. These two samples represent wet, warm climates with some ocean mixing and stratification. The stable isotope signal of foraminifer tests from the Manassi section was influenced by the global temperature changes, but the local factors also played an important role. The palaeoenvironments derived from stable isotope analysis in this study are interpreted as responses to the local tectonic instability together with monsoon intensities that enhanced continental runoff, characteristic for the time interval studied in the study area. Due to the limited data available from this study, no correlations with the precessional, obliquity, or eccentricity cycles can be made.

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Acknowledgments

The authors wish to thank Dr. N. Tsaparas for helping in the field. This work was funded by University of Athens Project no 70/4/7612. We are grateful for the isotope analyses carried out in the laboratory of CNR in Naples, Italy. We are especially indebted to Dr. F. Lirer (CNR Naples) for the fruitful discussions. We also thank C. John and an anonymous reviewer for the useful comments and suggestions.

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Drinia, H., Antonarakou, A. Palaeoceanography of the Miocene (Tortonian) deposits of the Pre-Apulian zone, western Greece, as recorded by foraminifer and stable isotope records. Int J Earth Sci (Geol Rundsch) 101, 521–534 (2012). https://doi.org/10.1007/s00531-011-0684-9

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