Advertisement

STRATI 2013 pp 1115-1118 | Cite as

Planktonic Foraminiferal Biozonation of the Oligocene in the Northern Adriatic Sea

  • Morana Hernitz KucenjakEmail author
  • Vlasta Premec Fucek
Conference paper
Part of the Springer Geology book series (SPRINGERGEOL)

Abstract

Samples for detailed micropalaeontological research were selected from two deep exploration wells (Istra more-3 and Istra more-4) in the Adriatic Sea. On the basis of index taxa and selected species of planktonic foraminifera, the standard planktonic foraminiferal zonation for Oligocene sediments after Wade et al. (2011) was applied (zones O1–O7). The investigated deposits overlie the upper Eocene (E16) sediments, and are themselves overlain by lower Miocene rocks (Zone M1). Distinct changes in the composition of the planktonic foraminiferal assemblage are observed near the Eocene–Oligocene boundary. In the uppermost Eocene, just below the Eocene–Oligocene boundary, genera Cribrohantkenina and Globigerinatheka as well as most species of the genus Turborotalia (T. cerroezulensis, T cunialensis, and T. cocoaensis), disappear. Chiloguembelina cubensis appears just below the E–O boundary, and Cassigerinella chipolensis, Chiloguembelina sp., Dentoglobigerina tapuriensis, D. tripartita, D. venezuelana, Dentoglobigerina sp., and Subbotina sp. appear above the boundary. The transition between the Eocene and Oligocene is also characterized by a reduction in size of the specimens of genus Pseudohastigerina as well as of species Chiloguembelina cubensis and Ch. ototara. The boundary between the lower and upper Oligocene is defined by the highest common occurrence (HCO) of Ch. cubensis; that is, the proportion of this species in the planktonic foraminiferal community in the small size fraction (125–63 μm) is greater than 5 %. The Oligocene–Miocene boundary is marked by the first appearance of the species Paragloborotalia kugleri.

Keywords

Biostratigraphy Oligocene Planktonic foraminifera Northern Adriatic Sea 

References

  1. Bolli, H. M., & Saunders, J. B. (1985). Oligocene to Holocene low latitude planktic foraminifera. In H. M. Bolli, Saunders J. B. & K. Perch-Nielsen (Eds.), Plankton stratigraphy (pp. 155–262). Cambridge: Cambridge University Press.Google Scholar
  2. Coxal, H. K., & Wilson, P. A. (2011). Early Oligocene glaciation and productivity in the eastern equatorial Pacific: Insights into global carbon cycling. Palaeoceanography,26(PA2221), 1–18.Google Scholar
  3. Iaccarino, S. M., Premoli Silva, I., Biolzi, M., Foresi, M., Lirer, F., & Petrizzo, M. R. (2005). Practical Manual of Oligocene to middle Miocene planktonic foraminifera. International school on planktonic foraminifera, Universita degli Studi di Perugia, Università degli Studi di Parma, Universita degli Studi di Milano, Perugia–Parma–Milano, 124.Google Scholar
  4. Katz, M. E., Miller, K. G., Wright, J. D., Wade, B. S., Browning, J. V., Cramer, B. S., et al. (2008). Stepwise transition from the Eocene greenhouse to the Oligocene icehouse. Nature,1, 329–333.Google Scholar
  5. Miller, K. G., Browning, J. V., Aubry, M.-P., Wade, B. S., Katz, M. E., Kulpecz, A. A., et al. (2008). Eocene–Oligocene global climate and sea-level changes: St. Stephens Quarry, Alabama. Geological Society of America Bulletin,120, 34–53.CrossRefGoogle Scholar
  6. Miller, K. G., Wright, J. D., Katz, M. E., Wade, B. S., Browning, J. V., & Cramer, B. S., et al. (2009). Climate treshold at the Eocene–Oligocene transition: Antarktic ice sheet influence on ocean circulation. In C. Koeberl & A Montanari (Eds.), The late Eocene Earth-hothouse, icehouse, and impacts (Vol. 452, pp. 169–178). Tulsa: Geological Society of America Special Publication.Google Scholar
  7. Pearson, P. N., Olsson, R. K., Huber, B. T., Hemleben, C., & Berggren, W. A. (2006). Atlas of Eocene planktonic foraminifera. The Cushman Foundation for Foraminiferal Research, Special Paper,41, 513.Google Scholar
  8. Spezzaferri, S. (1994). Planktonic foraminiferal biostratigraphy and taxonomy of the Oligocene and lower Miocene in the oceanic record. An overview. Paleontographica Italica,81, 1–187.Google Scholar
  9. Wade, B. S., & Pälike, H. (2004). Oligocene climate dynamics. Palaeoceanography, 19, 1–16.Google Scholar
  10. Wade, B. S., Pearson, P. N., Berggren, W. A., & Pälike, H. (2011). Review and revision of Cenozoic planktonic foraminiferal biostratigraphy and calibration to the geomagnetic polarity and astronomical time scale. Earth Science Review,104, 111–142.CrossRefGoogle Scholar
  11. Zachos, J., Pagani, M., Sloan, L., Thomas, E., & Billups, K. (2001). Trends, rhythms, and aberrations in global climate 65 Ma to present. Science,292, 686–693.CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Morana Hernitz Kucenjak
    • 1
    Email author
  • Vlasta Premec Fucek
    • 1
  1. 1.INA—Industrija Nafte d.d., Exploration and Production BD, Field Engineering and Operations Sector, E&P Research Laboratory DepartmentGeology and Geochemistry Business UnitZagrebCroatia

Personalised recommendations