Radiolarians of the upper Cenomanian and lower Turonian from deposits of the Ananuri Formation, the western Caucasus (Lazarevskoe area)
Tóm tắt
Diverse radiolarians (over 70 species) are detected in cherty rocks above the bituminous shale horizon, the marker of anoxic event OAE-2 recorded across the Cenomanian-Turonian boundary in the upper part of the Ananuri Formation of flyschoid deposits, the Lazarevskoe area of the western Caucasus. The radiolarian assemblages studied are comparable in composition with radiolarians from concurrent Cenomanian-Turonian boundary strata in other Mediterranean regions (e.g., in the Crimea and Turkey). The lower radiolarian assemblage includes index species Dactyliosphaera silviae of synonymous Cenomanian zone. Alievium superbum present in the upper assemblage is index species of the relevant Turonian zone. Within the studied flyschoid sequence, sediments indicative of the above event (bituminous shales and cherts) are confined to upper elements of flysch rhythms.
Tài liệu tham khảo
S. L. Afanas’ev, Geology of the Western Caucasus (Voentekhizdat, Moscow, 2004) [in Russian].
S. L. Afanas’ev and N. I. Maslakova, “Upper Cretaceous Deposits in the Northwestern Caucasus,” Tr. Vsesoyuzn. Zaochn. Politekh. Inst., Ser. Gidrogeol. Eng. Geol. 37, 106–136 (1967).
Yu. V. Agarkov, N. I. Boiko, and V. I. Sedletskii, Cherty Rocks of the Northern Caucasus and Potential Practical Use (Rostov. Gos. Univ., Rostov-on-Don, 1992) [in Russian].
A. H. Bouma, Sedimentology of Some Flysch Deposits. A Graphic Approach to Facies Interpretation (Elsevier, Amsterdam, 1962).
L. G. Bragina, “Cenomanian and Turonian Radiolarians from the Crimean Mountains,” Byull. Mosk. O-va Ispyt. Prir., Otd. Geol. 74(3), 43–50 (1999).
L. G. Bragina, Extended Abstract of Candidate’s Dissertation in Geology and Mineralogy (GIN RAN, Moscow, 2001).
L. G. Bragina, “Cenomanian-Turonian Radiolarians of Northern Turkey and the Crimean Mountains,” Paleontol. J. 38(Suppl. 4), 325–456 (2004).
L. G. Bragina and N. Yu. Bragin, “Stratigraphy and Radiolarians from the Type Section of Perapedhi Formation (Upper Cretaceous of Cyprus),” Stratigr. Geol. Korrelyatsiya 4(3), 38–45 (1996) [Stratigr. Geol. Correlation 4 (3), 246–253 (1996)].
L. G. Bragina and N. Yu. Bragin, “Stratigraphy and Radiolarians of Upper Cretaceous Sedimentary Cover of the Arakapas Ophiolite Massif (Cyprus),” Stratigr. Geol. Korrelyatsiya 14(5), 506–506 (2006) [Stratigr. Geol. Correlation 14 (5), 507–523 (2006)].
P. Dumitrica, “Cryptocephalic and Cryptothoracic Nassellaria in some Mesozoic Deposits of Romania,” Rev. Roum. Geol. Geophys. Geoggr., Ser. Geol. 114(1), 45–124 (1970).
J. Erbacher, “Entwicklung und Paläoozeanographic mittelkretazischer Radiolarien der westlichen Tethis (Italien) und des Nordatlantiks,” Tubingen Mikropal. Mitt., No. 12, 1–119 (1994).
I. E. Karstens, The Ananuri Horizon (Gortoptekhizdat, Moscow, 1932) [in Russian].
L. I. Kazintsova, Radiolarians, Atlas of Guide Faunal Groups from the Cretaceous of Sakhalin (Nedra, St. Petersburg, 1993), [in Russian].
B. M. Keller, “Upper Cretaceous Flysch in the Western Caucasus,”. Tr. Inst. Geol. Nauk AN SSSR, Ser. Geol., No. 12, 21–27 (1940).
W. Kuhnt, J. Thurow, J. Wiedmann, and J. P. Herbin, “Oceanic Anoxic Conditions Around the Cenomanian/Turonian Boundary and the Response of the Biota,” Mitt. Geol. Palaontol., Hamburg Univ. 60, 205–246 (1986).
D. V. Kurilov, “New Localities of Jurassic and Cretaceous Radiolarians in the Western Kamchatka,” in Western Kamchatka: Geologic Development in the Mesozoic (Nauchnyi Mir, Moscow, 2005), pp. 55–76 [in Russian].
M. Marcucci and S. Gargin, “The Fosso Cupo Formation (Northern Latium, Italy): Redefinition and New Age Data from Radiolarian and Calcareous Nannofossil Biostratigraphy,” Cretaceous Res. 13, 549–563 (1992).
D. P. Naidin and A. S. Alekseev, “Section of Cenomanian Deposits in the Kacha-Bodrak Interfluve (Crimea),” Izv. Vyssh. Uchebn. Zaved. Geol. Razved., No. 4, 11–25 (1980).
D. P. Naidin, A. S. Alekseev, and L. F. Kopaevich, “Fauna From Turonian Deposits in the Kacha-Bodrak Interfluve (Crimea) and the Cenomanian-Turonian Boundary,” in Organic Evolution and Biostratigraphy of the Mid-Cretaceous (Biologo-Pochv. Inst., Vladivostok, 1981), pp. 22–40 [in Russian].
D. P. Naidin and S. I. Kiyashko, “Geochemical Characteristics of the Cenomanian-Turonian Boundary Deposits in the Crimean Mountains. Pap. 1. Lithology, Content of Organic Carbon and Some Elements,” Byull. Mosk. O-va Ispyt. Prir., Otd. Geol. 69(1), 28–42 (1994a).
D. P. Naidin and S. I. Kiyashko, “Geochemical Characteristics of the Cenomanian-Turonian Boundary Deposits in the Crimean Mountains. Pap. 2. Carbon and Oxygen Isotope Composition; Accumulation Conditions of Organic Carbon,” Byull. Mosk. O-va Ispyt. Prir., Otd. Geol. 69(2), 59–74 (1994b).
B. B. Nazarov and D. I. Vitukhin, “Methods for Separation of Fossil Radiolarians,” Izv. Akad. Nauk SSSR, Ser. Geol., No. 10, 95–101 (1981).
L. O’Dogherty, “Biochronology and Paleontology of Mid-Cretaceous Radiolarians from Northern Apennines (Italy) and Betic Cordillera (Spain),” Mem. Geol. Lausanne, No. 21, 1–413 (1994).
E. A. Pessagno Jr., “Jurassic and Cretaceous Hagiastridae from the Blake-Bahama Basin (Site 5 A, JOIDES Leg 1) and the Great Valley Sequence, California Coast Ranges,” Bull. Am. Paleontol 60(264), 5–83 (1971).
E. A. Pessagno Jr., “Lower Cretaceous Radiolarian Biostratigraphy of the Great Valley Sequence and Franciscan Coast Ranges,” Publ. Cusman Found. Foraminiferal Res. 15, 1–87 (1977).
E. A. Pessagno Jr., “Radiolarian Zonation and Stratigraphy of Upper Cretaceous Portion of the Great Valley Sequence,” Micropaleontol. Spec. Publ. No. 2, 1–96 (1976).
M. G. Petrushevskaya and G. E. Kozlova, “Radiolaria,” in Initial Rep. Deep Sea Drill. Project, Vol. 14 (US Gov. Print. Off., Washington, 1972), pp. 495–648.
G. Salvini and M. Marcucci Passerini, “The Radiolarian Assemblages of the Bonarelli Horizon in the Umbria-Marche Apennines and Southern Alps, Italy,” Cretaceous Res. 19(6), 777–804 (1998).
S. O. Schlanger, M. A. Arthur, H. C. Jenkins, et al., “The Cenomanian—Turonian Oceanic Anoxic Event. 1. Stratigraphy and Distribution of Organic Carbon-Rich Beds and the Marine δ13C Excursion,” Spec. Publ. Geol., No. 26, 371–399 (1987).
S. Squinabol, “Le Radiolarie dei noduli selciosi nella Scaglia degli Euganei. Contribuzione I,” Riv. Ital. Paleontol. 9, 105–151 (1903).
S. Squinabol, “Radiolaria cretacee degli Euganei,” Atti Mem. Accad. Sci. Lett. Arti Padova, New. Ser. 20, 171–244 (1904).
S. Squinabol, “Contributo alla conoscenza dei Radiolarii fossili del Veneto. Appendice — Di Radiolari caratteristico del Secondario,” Mem. ist. geol. Univ. Padova 2, 249–306 (1914).
Y. Taketani, “Cretaceous Radiolarian Biostratigraphy of the Urakawa and Obira Areas, Hokkaido,” Sci. Rep. Tohoku Univ., 2nd Ser. (Geol.) 52(1–2), 1–76 (1982).
Y. Teraoka and C. Kurimoto, “Cretaceous Stratigraphy of the Shimanto Terrane in the Uwajima Area, West Shikoku, Southwest Japan, with Reference to the Stratigraphic Distribution of Mega-and Radiolarian Fossils,” Bull. Geol. Surv. Japan 37(8), 417–453 (1986).
N. B. Vassoevich, “Analogues of the Ananuri Formation (Lower Turonian) in the Southeastern Caucasus,” Dokl. Akad. Nauk SSSR 3(4), 155–161 (1947).
V. S. Vishnevskaya, Jurassic-Cretaceous Radiolarian Biostratigraphy in Russia (GEOS, Moscow, 2001) [in Russian].
V. S. Vishnevskaya, Yu. V. Agarkov, G. S. Zakariadze, and K. M. Sedaeva, “Late Jurassic-Cretaceous Radiolarians from the Greater Caucasus as a Key for Deciphering Age and Formation Settings of Ophiolites in the Lesser Caucasus,” Dokl. Akad. Nauk 310(6), 1417–1420 (1990).
V. S. Vishnevskaya, I. A. Basov, T. N. Palechek, and D. V. Kurilov, “Radiolarian and Foraminiferal Biostratigraphy of Jurassic-Cretaceous Deposits in the Western Kamchatka,” in Western Kamchatka: Geological Developments in the Mesozoic (Nauchnyi Mir, Moscow, 2005), pp. 6–54 [in Russian].
V. S. Vishnevskaya, T. N. Gorbachik, L. F. Kopaevich, and L. G. Bragina, “Foraminifers and Radiolarians across the Albian-Cenomanian and Cenomanian-Turonian Boundaries (Northern Peri-Tethys),” Stratigr. Geol. Korrelyatsiya 14(5), 28–49 (2006) [Stratigr. Geol. Correlation 14 (5), 486–506 (2006)].
O. S. Vyalov, “Geological Investigations of 1931 in the Western Caucasus,” Zap. Vseros. Mineral. O-va, Ser. 2 63(2), 271–292 (1934).