tailieunhanh - Microfossil assemblages (diatoms, calcareous nannofossils, and silicoflagellates), paleoenvironment, and hydrocarbon source rock potential of the Oligocene Ruslar Formation at Karadere, Bulgaria

T he Oligocene Ruslar Formation, an equivalent of the Maykop Suite, is a potential hydrocarbon source rock in the western Black Sea Basin. In contrast to the offshore areas, the depositional environment and hydrocarbon source rock potential of onshore Bulgaria sediments are largely unknown. Hence, a 14-m-thick section of the Ruslar Formation, exposed near Karadere (Black Cape) along the Black Sea coast, provides an excellent opportunity to study the upper part of the Ruslar Formation. Here, laminated diatomrich mudstones with frequent thin sandstone beds and a prominent concretion horizon are exposed. Furthermore, the fossil diatom assemblages provide a key component to understand the paleoenvironment. | Turkish Journal of Earth Sciences Turkish J Earth Sci 2020 29 154-169 http earth TÜBİTAK Research Article doi yer-1907-9 Microfossil assemblages diatoms calcareous nannofossils and silicoflagellates paleoenvironment and hydrocarbon source rock potential of the Oligocene Ruslar Formation at Karadere Bulgaria 1 1 2 Emilia TULAN Reinhard F. SACHSENHOFER Jakub WITKOWSKI 3 4 1 Gabor TARI Stjepan ĆORIĆ Achim BECHTEL 1 Montanuniversitaet Leoben Leoben Austria 2 Institute of Marine and Environmental Sciences University of Szczecin Szczecin Poland 3 OMV Exploration amp Production GmbH Vienna Austria 4 Geological Survey of Austria Vienna Austria Received Accepted Published Online Final Version Abstract T he Oligocene Ruslar Formation an equivalent of the Maykop Suite is a potential hydrocarbon source rock in the western Black Sea Basin. In contrast to the offshore areas the depositional environment and hydrocarbon source rock potential of onshore Bulgaria sediments are largely unknown. Hence a 14-m-thick section of the Ruslar Formation exposed near Karadere Black Cape along the Black Sea coast provides an excellent opportunity to study the upper part of the Ruslar Formation. Here laminated diatom- rich mudstones with frequent thin sandstone beds and a prominent concretion horizon are exposed. Furthermore the fossil diatom assemblages provide a key component to understand the paleoenvironment. Overall Paleogene diatoms are understudied in the Black Sea Basin and therefore only a genus-level study is undertaken here. The studied Ruslar Formation contain remarkably diverse and well- preserved diatom assemblage with 23 different genera. The most frequent genera are Paralia Distephanosira and Stephanopyxis. Common genera include Coscinodiscus Hemiaulus Pseudopodosira Rouxia and Xanthiopyxis. Rare taxa include Actinoptychus Asterolampra Azpeitia Delphineis Distephanosira Diploneis Eunotogramma Eurossia Lyrella .

• Địa Lý
• Journal of Earth Sciences
• Black Sea
• Ruslar Formation
• Hydrocarbon source rock
• Diatom assemblages
• Calcareous nannofossils
• Vietnam Journal of Earth Sciences
• General characteristics of rare earth
• Radioactive elements in Dong Pao deposit
• The natural tap and thermal waters
• Liquid scintillation counter
• Dodecahedron trapezohedron crystal habits
• Garnet bearing xenoliths
• Greenish reddish dark brown colour
• Gemmological characteristics
• Light rare earth elements
• metamorphism
• earth sciences
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• VNU Journal of Science
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• scientific reports
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