INTERACTIONS BETWEEN TECTONIC ACTIVITY AND EUSTATIC SEA-LEVEL CHANGES IN THE PINDOS AND MESOHELLENIC BASINS, NW GREECE: BASIN EVOLUTION AND HYDROCARBON POTENTIAL
P. Avramidis*, A. Zelilidis* +, I. Vakalas* and N. Kontopoulos*
* University of Patras, Department of Geology, 26500 Patras, Greece.
+ author for correspondence: A.Zelilidis@upatras.gr
This paper investigates the sedimentological response of the Tertiary Pindos and Mesohellenic Basins to localized tectonic and eustatic sea-level changes in a submarine setting dominated by turbidite deposition. Five composite stratigraphic cross-sections were compiled from field data, three in the Pindos Basin and two in the Mesohellenic Basin; 45 samples were dated by means of nannofossil biostratigraphy. On the basis of these field studies, we relate observed changes in depositional environment to eustatic sea-level changes and to activity on local thrusts. Between the early Eocene and the late Miocene, tectonically-driven subsidence in both basins was generally more significant than eustatic variations in controlling depositional patterns. However, depositional conditions can be related to eustatic changes at four specific times:
Standard organic geochemical analyses were carried out on 93 samples from both basins, including Rock-Eval pyrolysis and column and gas chromatography. Preliminary results indicate that the sedimentary sequences in both the Pindos and Mesohellenic Basins may have the potential to generate natural gas.