Zusammenfassung
In SW Slowenien (45 km SSE von Ljubljana) sind jurassische Flachwasserkarbonate im Mala Gora-Gebirge aufgeschlossen. Die Gesamtmächtigkeit der Abfolge beträgt etwa 1500 m. Oolith-Einschaltungen kommen im Ober-Lias (22,5 m), Dogger (8 m), Unter-Malm (267,5 m) und Ober-Malm (56 m) vor. Sie zeigen Unterschiede in ihrer faziellen und diagenetischen Ausbildung, die auch durch die Ergebnisse der geochemischen Analysen unterstrichen werden. Die vier Oolith-Einheiten lassen sich besonders auf Grund ihrer verschiedenen Zementabfolgen unterscheiden, die in den jeweiligen stratigraphischen Niveaus charakteristisch sind. Das Beispiel zeigt, daß diagenetische Merkmale gute stratigraphische, Marken darstellen können.
In einem Gebiet wie dem slowenischen Jura, ist man zur stratigraphischen Einstufung der Gesteine fast ausschließlich auf Mikrofossilien angewiesen die auf Grund iherer faziellen Abhängigkeit häufig fehlen. Eine geeichte, auf Diagenesemerkmalen aufgebaute Stratigraphic kann in faziell einheitlichen, an Fossilien armen Karbonatserien Korrelationen über größere Entfermungen ermöglichen.
Summary
Shallow-water carbonate rocks of Jurassic age are well exposed about 45 km SSE of Ljubljana in the Mala Gora Mountains of Southern Slovenia. The thickness of the sequence is about 1500 m. Oolitic carbonate rocks occur in the Upper Lias (22.5 m thick), Dogger (8 m), Lower Malm (267.5 m), and Upper Malm (56 m).
The stratigraphic relationship of these carbonates was established using microfossils and lithologic comparison. They exhibit pronounced variabilities in facies and diagenetic characteristics which are also supported by geochemical data. The four oolitic units represent only slightly different environments of deposition, but it is the diagenetic development of cement types which serves as a principal distinguishing factor. Different types of cements are of diagnostic value for distinct stratigraphic levels. The correlation of carbonate units, poor in fossils and of uniform facies, might become easier by using diagenetic patterns, varying during geological time.
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Strohmenger, C., Dozet, S. & Koch, R. Diagenesemuster-Stratigraphie: Oolith-Horizonte im Jura von SW-Slowenien. Facies 17, 253–265 (1987). https://doi.org/10.1007/BF02536790
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DOI: https://doi.org/10.1007/BF02536790