On the Relative Age of the Late Cretaceous Zorin and Chingandzha Floras in the Northeast of Russia
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The Zorin and Chingandzha floras significantly differ in their systematic composition, but they are buried at the same stratigraphic level. On this basis, they are considered to be of the same age and are assigned to the Turonian–Coniacian period. The revealed features of the lithological composition of the plant-bearing deposits, their sequence, and the composition of the overlaying volcanic rocks indicate that both floras represent the first stage of the development of the outer zone of the Okhotsk–Chukotka Volcanic Belt. However, they are separated by one or two local geological events, and hence by a significant period of time. It can be confirmed that the Zorin flora was formed and existed earlier than the Chingandzha flora.
Keywords:paleoflora volcanic sedimentary deposits volcanites sections amphiboles pyroxenes Late Cretaceous Northeast of Russia
The author is sincerely grateful to A.B. German, D.A. Yudova, Yu.E. Apt, and P.I. Alekseev for the help at the work with the article.
This work was performed according to the State Task of the Botanical Institute, the Russian Academy of Sciences, Fossil Plants of Russia and Adjacent Areas: Systematics, Phylogeny, Paleofloristics, and Paleophytogeography.
This work was supported by the Russian Foundation for Basic Research, project no. 19-05-00121.
- 1.V. F. Belyi, Stratigraphy and Structures of the Okhotsk–Chukotka Volcanogenic Belt, (Nauka, Moscow, 1977) [in Russian].Google Scholar
- 2.V. F. Belyi, “On the Age problem of the Okhotsk–Chukotka volcanogenic belt,” Tikhookean. Geol., No. 3, 101–109 (1982).Google Scholar
- 3.V. F. Belyi, “North Pacific refugium and problems of the Middle Cretaceous paleofloriostics on Northeast Asia,” Tikhookean. Geol. 16 (6), 102–113 (1997).Google Scholar
- 4.Glossary of Geology (Nedra, Moscow, 1978), Vol. 2, p. 455 [in Russian].Google Scholar
- 5.A. B. German, Albian–Paleocene Flora of the North Pacific (GEOS, Moscow, 2011) [in Russian].Google Scholar
- 6.L. B. Golovneva, S. V. Shczepetov, and P. I. Alekseev, “Chingandzhin Flora (Late Cretaceous, Northeast Russia): systematic composition, paleoecological features, and stratigraphic significance,” Chteniya Pamyati A.N. Krishtofovicha, No. 7, 37–61 (2011).Google Scholar
- 7.L. B. Golovneva, S. V. Shczepetov, and A. E. Livach, “Systematic composition and evolutionary significance of the floral assemblage of the Toptan Formation (Lower Cretaceous of Northeast Russia),” Paleobotanika 8, 28–44 (2017).Google Scholar
- 8.Classification and nomenclature of the volcanogenic clastic rocks,” Petrographic Code: Magmatic and Metamorphic Rocks (VSEGEI, St. Petersburg, 1995) [in Russian].Google Scholar
- 9.A. E. Livach, N. I. Tret’yakova, and A. P. Churavtsov, State Geological Map of the USSR. 1 : 200 000 (2nd Ed.), Sugoiskaya Series. Sheet P-56-XVIII (Omsukchan): Explanatory Note (Moscow, 2009) [in Russian].Google Scholar
- 10.V. T. Matveenko, “Petrology and Common Features of the Metallogeny of the Omsukchan Ore Cluster, Northeast USSR,” Tr. VNII-1. Geol. 31, (1957).Google Scholar
- 11.Resolutions of the 2nd Interdisciplinary Regional Stratigraphic Conference on the Precambrian and Phanerozoic of Northeast USSR, Magadan, 1974–1975 (GKP SVTGU, Magadan, 1978) [in Russian].Google Scholar
- 12.Resolutions of the 3rd Interdisciplinary Stratigraphic Conference on the Precambrian, Paleozoic, and Mesozoic of Northeast Russia, St. Petersburg, 2002, (VSEGEI, St. Petersburg, 2009), p. 266 [in Russian].Google Scholar
- 13.V. A. Samylina, “Early Cretaceous flora of the USSR Northeast. On Problem of the growth of the cenotypical flora),” in 27th Komarov Readings, (Nauka, Leningrad, 1974) [in Russian].Google Scholar
- 14.V. A. Samylina, Cretaceous Flora of Omsukchan (Nauka, Leningrad, 1976) [in Russian].Google Scholar
- 15.V. A. Samylina, “On the Cretaceous flora of the Kananyga River, Northern Okhotsk Region),” in Stratigraphy and Paleontology of the Paleozoic and Mesozoic Sediments of the Northeastern USSR (Geol. fond RSFSR, Moscow, 1984), pp. 178–190 [in Russian].Google Scholar
- 16.V. A. Samylina, “Late Cretaceous flora of the Tap River (Northern Okhotsk Region),” in Yearbook of the All-Union Paleontol. O-va, (VPO, Moscow, 1984), Vol. 27, pp. 236–247 [in Russian].Google Scholar
- 17.E. K. Ustiev, “Mesozoic and Cenozoic magmatism of the Northeastern USSR,” Mater. Geol. Severo-Vostoka SSSR, No. 4, 30–51 (1949).Google Scholar
- 18.E. K. Ustiev, “Okhotsk tectonomagmatic belt and some related problems,” Sov. Geologiya No. 3, 3–26 (1959).Google Scholar
- 19.S. V. Shczepetov, Stratigraphy of the continental Cretaceous of the southwestern flank of the Kolyma highland, (SVKNII DVO RAN, Magadan, 1991) [in Russian].Google Scholar
- 20.S. V. Shczepetov, Continental Cretaceous Stratigraphy of Northeast Russia (SVKNII DVO RAN, Magadan, 1995) [in Russian].Google Scholar
- 21.S. V. Shczepetov and L. B. Golovneva, “Late Cretaceous flora from volcanogenic rocks of the Northern Okhotsk area (Okhotsk–Chukotka volcanogenic belt),” Paleobotanika 1, 45–95 (2010).Google Scholar
- 22.S. V. Shczepetov and L. B. Golovneva, “The Late Cretaceous Zarya flora of the Northern Okhotsk Region and phytostratigraphy of the lower part of the Okhotsk–Chukotka Volcanogenic Belt Section,” Stratigr. Geol. Correl. 22 (4), 391–405 (2014).Google Scholar
- 23.D. A. Yudova and L. B. Golovneva, “Trochodendroides Berry genus in the Chingandzhin Flora of the Northeast Russia,” Paleobotanika 5, 60–72 (2014).Google Scholar
- 24.D. A. Yudova and L. B. Golovneva, “New species of the Endl. (Cupressaceae) genus from Late Cretaceous sediments of Northeast Russia,” Paleobotanika 6, 80–95 (2015).Google Scholar
- 25.D. A. Yudova, L. B. Golovneva, and P. I. Alekseev, “Distribution of the Dalembia E. Lebedev et Herman (Magnoliophyta) genus in the Late Cretaceous flora of the northern Pacific,” Paleobotanika 7, 66–79 (2016).Google Scholar
- 26.A. B. Herman, L. B. Golovneva, S. V. Shczepetov, and A. A. Grabovsky, “The Late Cretaceous Arman flora of Magadan Oblast, Northeastern Russia,” Stratigr. Geol. Correl. 24 (7), 651–760 (2016).Google Scholar