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Journal of Industrial and Environmental Chemistry | Volume 3

December 02-03, 2019 | Dubai, UAE

Oil & Gas

International Conference and Expo on

edimentological studies of the Upper Cretaceous–Lower

Eocene limestones in the western part of the Ionian basin

(Araxos area) indicate that these sediments are composed

of calciturbidites interbedded with breccia-microbreccia.

Breccia - microbreccia deposits are structureless, display

channelized geometry with calciturbiditic blocks internally

to the channels. Most of the clasts were sourced from

the underlying Lower Cretaceous "Vigla limestones".

Calciturbidites include Ta to Te Bouma sub-divisions and are

organized in cycles that form channelized deposits with a

high degree of amalgamation. Statistical analysis confirms the

presence of order in the sub-division sequence. The thickness

of the calciturbidite event beds of the section is also well

characterized by a lognormal statistical distribution, possibly

produced by multiplicative processes during carbonate

gravity flow sedimentation. The microfacies analysis suggests

that most of the examined samples represent allochthonous

bioclastic material that has been transported from a nearby

platform/reef environment of deposition. In this case, the

depositional environment should be defined as a top of

slope or toe of slope environment, where microbrecciated

or brecciated deposits rested and accumulated. The nature

of the bioclasts and lithoclasts that constitute the respective

deposits represent shallow shelf environments, thus the

allochthonous material originated from the platform.

Resuspension or slumping of platform edge sediments

produced turbidity currents (calciturbidite unit) that were

time-equivalent to the debris flows (breccia unit) formed by

the slumping of the platform margin. Breccia deposits and

calciturbidites with Ta to Tc sub-divisions are more proximal

deposits, whereas microbreccia and calciturbidites with

the complete Bouma sequence were located in more distal

positions from the source. By the uppermost Cretaceous,

reefs built up on the platforms within the Ionian basin (Fig.

25) and contributed detritus to the microbreccia/breccia unit.

Following the facies analysis and the suggested depositional

environments and their conditions indicated that the Ionian

Basin was influenced by intense tectonic activity during the

early Cretaceous. Synthetic and antithetic faults caused

the formation of asymmetric grabens with their uplifted

shoulders serving as major sediment contributors into the

basin. As a result, a significant amount of coarse-grained

material was delivered into the basin. During the late

Cretaceous, the shoulders of these asymmetric grabens

were most active causing erosion of the pre-existing deposits

of Lower Cretaceous "Vigla Formation", developing the

channelized microbreccia and breccia. The basin asymmetry

and variations of water depth resulted in variable thicknesses

of the breccia/microbreccia channels and calciturbidites.

The early Cretaceous to early Eocene depositional history in

the Ionian Basin indicates that the regional tectonic activity,

rather than the eustatic sea-level changes, was the major

factor that influenced the basin evolution, suggesting a syn-

rift stage being active from the Jurassic to the early Eocene.

Speaker Biography

Avraam Zelilidis was graduate Geologist in 1984 and earned PhD in 1988

from the Department of Geology of the University of Patras. He was

appointed as a lecturer in 1993 and since 2009 as a full professor in the

Department of Geology of the University of Patras. He served as Dean of

the Faculty of Natural Sciences at the University of Patras from 2006 to

2010. Research deals with the Analysis of Sedimentary Basins, Sequence

Stratigraphy, Seismic Stratigraphy and Petroleum Geology. Have produced

many research projects for oil companies using data in both surface

and subsurface, while he organized many field seminars for foreign oil

companies. He has published more than 100 papers in International

journals, most of which refer to the Hydrocarbon potential in Greece and

have been presented in International conferences in an effort to highlight

the issue of existence-exploitation of Hydrocarbon fields in Greece.

Zelidlisavvaram@patras.gr

Avraam Zelilidis

University of Patras, Greece

Late cretaceous to early Eocene geological history of the eastern

Ionian Basin, southwestern Greece: A sedimentological approach

Avraam Zelilidis

, J Ind Environ Chem, Volume:3

DOI: 10.35841/2591-7331-C3-013