Diagenetic Evolution of Upper Jurassic-Lower Cretaceous Berdiga Formation, NE Turkey: Petrographic and Geochemical Evidence
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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.
Keywords
Diagenesis Carbonates Berdiga Formation NE turkeyNotes
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.
References
- 1.Kirmacı, M.Z., Koch, R., Bucur, J.I.: An early Cretaceous section in the Kırcaova area (Berdiga Limestone, NE-Turkey) and its correlation with platform carbonates in W-Slovenia. Facies 34, 1–22 (1996)CrossRefGoogle Scholar
- 2.Dunham, R.J.: Classification of carbonate rocks according to depositional textures (1962)Google Scholar
- 3.Durocher, S., Al-Aasm, I.S.: Dolomitization and neomorphism of Mississippian (Visean) upper debolt formation, blueberry field, Northeastern British Columbia: geologic, petrologic, and chemical evidence. Am. Assoc. Petrol. Geol. Bull. 81(6), 954–977 (1997)Google Scholar
- 4.Sibley, D.F., Gregg, J.M.: Classification of dolomite rock textures. J. Sediment. Res. 57(6) (1987)Google Scholar
- 5.Flügel, E.: Microfacies Analysis of Carbonate Rocks. Analysis, Interpretation and Application. Springer, Berlin (2004)Google Scholar
- 6.Warren, L.: Dolomite: occurrence, evolution and economically important associations. Earth-Sci. Rev. 52, 1–81 (2000)Google Scholar
- 7.Veizer, J., Ala, D., Azmy, K., Bruckschen, P., Buhl, D., Bruhn, F., Jasper, T.: 87Sr/86Sr, δ13C and δ18O evolution of Phanerozoic seawater. Chem. Geol. 161(1–3), 59–88 (1999)CrossRefGoogle Scholar