![Show Menu](styles/mobile-menu.png)
![Page Background](./../common/page-substrates/page0005.jpg)
allied
academies
Page 12
Journal of Industrial and Environmental Chemistry | Volume 3
December 02-03, 2019 | Dubai, UAE
Oil & Gas
2
nd
International Conference and Expo on
S
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.
e:
Zelidlisavvaram@patras.grAvraam 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