Conglomerate clast composition analysis in a submarine fan depositional environment : a statistical approach in the provenance of the Cenozoic Pindos foreland basin in Achaia, Western Greece

• Κύριος συγγραφέας: Σάββα, Βασιλική
• Άλλοι συγγραφείς: Ζεληλίδης, Αβραάμ
• Μορφή: Thesis
• Γλώσσα: English
• Έκδοση: 2017
• Θέματα: Sedimentology; Conglomerate clast composition analysis; Pindos foreland basin; Statistical analysis; Achaia Western Greece; Submarine fan; Ιζηματολογία; Ανάλυση σύστασης κροκαλοπαγών; Λεκάνη προχώρας Πίνδου; Στατιστική ανάλυση; Αχαΐα Δυτική Ελλάδα; Υποθαλάσσια ριπίδια; 551.3

In this thesis is studied the Pindos foreland basin and specifically conglomerate of the Tritea sedimentary sub-basin. Also, statistical analysis of conglomerate became for further investigation. The Pindos foreland basin seems to have a petroleum potential, is characterized by petroleum accumulation in turbidite sandstone reservoirs and the porosity permeability of the reservoir is extremely complex. The Tritea sub-basin is in Achaia in NW Peloponnesus and is bounded to the east by the Pindos Thrust and to the west by the Gavrovo Thrust. Conglomerates are siliciclastic sedimentary rocks that consist predominantly of gravel-size clasts. They are usefulness in tectonic, provenance analysis, in the rather specialized depositional environments of conglomerates and some conglomerates serve as reservoir rocks for oil and gas. The conglomerate measurements include the sphericity, the roundness, the length of long axis and the lithology. Descriptive classification of conglomerates is useful in relating clast composition to sediment sources (provenance) and relate to depositional origin. So, nine outcrops (eleven sections) were analyzed and they were described section by section. Also, the depositional facies, the facies associations and depositional sub-environments were recognized. Bar diagrams about roundness, sphericity, long axis, pies for lithology were made for each section as well as comparative diagrams for all sections. The combined results from the different used tools are that the major provenance was the Pindos mountains, whereas Skolis Mountain was excluded as source area and transportation from the sourced rocks or internally to the basin took place in different distances. There are at least two different mechanisms of transportation one from Pindos Mountains and a second from uplifted earlier deposited sub-marine fans. Megaclasts were produced from cannibalized pre-existing submarine fans that accumulated earlier in the eastern parts of the basin, and were affected by basin deformation due to tectonic activity. The observed differentiations in lithology, roundness, sphericity and length of long axis support the idea of the existence of a thin bedded source of Pindos Mountains rocks affected by nappe tectonics. The statistical results from PCA are in accordance with sedimentological results, which suggest two groups of sections.