The influence of preexisting structure and halokinesis on organic matter preservation and thrust system evolution in the Ionian Basin, Northwest Greece
Journal Article
·
· AAPG Bulletin
OSTI ID:90871
- Univ. of Athens (Greece)
The opening of the Ionian basin and its internal differentiation is attested to by lateral facies and thickness variations of the formations deposited during the Pliensbachian and Tithonian (synrift formations). The beginning of the synrift sequence is represented by the Siniais Limestones (Pliensbachian) and their lateral equivalent, the Louros Limestones. The geometric characteristics of the extensional basin depend on both extension related to the latest opening of the Tethys ocean and halokinesis of the Ionian zone evaporitic substratum. The accumulation of organic matter in the {open_quotes}Lower and Upper Posidonia beds{close_quotes} of the Ionian zone during the Toarcian and Tithonian is directly related to the geometry of the synrift period of the Ionian basin. Restricted subbasins were formed where the geometry of the basin favored stagnation and consequently the locally euxinic conditions of bottom waters. Anoxic conditions persisted locally to the postrift period in areas where the {open_quotes}Upper Siliceous Zone{close_quotes} (Albian-Cenomanian) of the Vigla Limestones is well developed; these areas probably represent subbasins that were preserved by the continuation of halokinetic movements during the postrift period. During the early Miocene Alpine orogeny, collision-related compressive stresses on the margin induced the reactivation of preexisting fractures, which were responsible for the inversion tectonics that affected the Mesozoic basin. The geometric characteristics of the inverted basin were dependent on lithology (evaporates), geometry of the extensional structures, and direction of the compressional phase. The geological evolution in the Ionian basin is an example of inversion tectonics of a basin with an evaporitic substratum. The opening of the Ionian basin and the inversion tectonics influence both the source rocks and the probable hydrocarbon traps of the Ionian zone.
- OSTI ID:
- 90871
- Journal Information:
- AAPG Bulletin, Journal Name: AAPG Bulletin Journal Issue: 7 Vol. 79; ISSN 0149-1423; ISSN AABUD2
- Country of Publication:
- United States
- Language:
- English
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