Abstract
Upper Jurassic-lower Cretaceous Berdiga Formation crops out extensively in NE Turkey. The host carbonates at Eski Gümüşhane section are pervasively dolomitized by fabric-destructive and fabric-preserving replacive dolomites (RD). These dolomites are Ca-rich and non-stoichiometric (Ca56-58Mg42-44). They have highly variable but low δ18O (−11.38 to −4.05‰ V-PDB) and δ13C (0.69 to 3.13‰V-PDB) values, radiogenic 87Sr/86Sr ratios (0.70753 to 0.70884), extremely high Fe (2727–21053 ppm) and Mn (1548–27726 ppm) contents. Microcrystalline quartz cement, dolomite cement and the scattered euhedral pyrite minerals (average 5 μm) are also observed in the dissolution porosity of replacive dolomites. This study demonstrates that these carbonates have undergone a complex diagenetic history from shallow to deep burial associated with syn-sedimentary extensional tectonic activity during the Albian–Aptian and later with the hydrothermal emplacement of the polymetallic mineralization during the Eocene.
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Acknowledgements
The authors thank Karadeniz Technical University (Project no: FBA-2015-5160) and TUBİTAK (Project no: 115Y005, ÇAYDAG and International PhD Research Scholarship Program-2214-A-BIDEP) for their financial support. ISA acknowledge the support from NSERC.
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Özyurt, M., Al-Aasm, I.S., Ziya Kirmaci, M. (2019). Diagenetic Evolution of Upper Jurassic-Lower Cretaceous Berdiga Formation, NE Turkey: Petrographic and Geochemical Evidence. In: Boughdiri, M., Bádenas, B., Selden, P., Jaillard, E., Bengtson, P., Granier, B. (eds) Paleobiodiversity and Tectono-Sedimentary Records in the Mediterranean Tethys and Related Eastern Areas. CAJG 2018. Advances in Science, Technology & Innovation. Springer, Cham. https://doi.org/10.1007/978-3-030-01452-0_42
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DOI: https://doi.org/10.1007/978-3-030-01452-0_42
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