DYNAMICS and ACTIVE PROCESSES - International Lithosphere ...

1991), Preapulian and Ionian zones have undergone two successive clockwise rotations
of about 25 o each, of Middle Miocene and Plio-Quaternary ages respectively. This period
coincides with the subduction of the Adria micro plate underneath Ionian Orogen.
External zones of Albanides and Hellenides, during last 15 My have been affected by
displacements which are much more rapid and of much larger amplitude than it is
supposed by geological and geophysical studies.
Sazan-Karaborun platform (Adria micro plate) it is plunged deep east below the central
part of Ionian Zone, compressing strongly carbonate formation, folding and crushing it,
evaporate substratum and terrigenous basement of Permian age below evaporates. By
strong compression salt formation was squeezed up to the surface along with thrust faults.
While in central Kurveleshi fault, by the compression from both sides were squeezed to
the surface fragments of basement with volcanic and metamorphic blocks and windows
of pink color terrigenous series of Permian. We consider this series named “motley serie”
(Seria laramane”) by Isa Bajo (1984) as the basement of evaporate substratum.
Lithological content and color are similar with Permian deposits all over Mediterranean
Basin. Stratigraphical and space position of this series coincides with the bottom of salt
rocks. The “Cap rock” is formed at the top of evaporate substratum, while this pinkish
packet it is placed at the bottom of gypsum rocks. The absolute geological age, according
the strontium isotope analysis is Lower Permian (the end of Wordian or Middle
Changshigian: 252.5-246My) for Peshkopi, and Middle Permian, Lower Artiskian
(266.5My) up to Lower Triassic (245 My) for Dumrea gypsum (Diamanti F., 2002). The
hypothesis of Permian age as basement of evaporates is done and argued before (Bajo I.
1984, Serjani and Bajo, 1994). At last, it is important to note, that the famous Albanian
specialist of tectonic, and the highest authority in geology of Albania, Prof. Vangjel
Melo, since the first view of this packet has given the option of Permian age.
Just this basement below evaporate rocks, due to its lithological content and
stratigraphical position may have important interest in hydrocarbon generation and
trapping, amongst the other known upper Mesozoic levels.
CONCLUSIONS
In southwestern part of Ionian Zone structures are not separated, but they form regular
anticline and syncline chains of southeast-northwest direction. Their crest lines change
level along with strike down and up, in form of steps.
Deep seismogenic faults, have a thrust character from southeast to northwest, but by the
subduction of Adria micro plate underneath the Orogen, retrocharriages from westnorthwest
to east-southeast are happened.
Çika and Fterra thrust faults have buried western flanks of anticline chains below the
eastern flanks. Parts of the next syncline chains are buried as well.
Adria micro plate it is sub ducted deep to the east up to the central part of Kurveleshi
anticline belt, jumping and squeezing evaporite substratum and terrigenous basement of
Permian. The basement below the evaporate substratum, constitute may be a new
interesting level for hydrocarbon generation and trapping in Ionian Zone.
REFERENCES
1. Bakiaj H., Bega Z., 1991. Bul. Shk. Gjeol. Nr. 1 Tirane.
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