Conodonts from Ordovician ophiolites of central Kazakhstan

• Autorzy: Zhylkaidarov A

Warianty tytułu

PL

Konodonty z ordowickich ofiolotow srodkowego Kazachstanu

• Języki publikacji: EN

Abstrakty

EN

Central Kazakhstan is frequently referred to as a hypothetical Paleozoic continent Kazakhstania, although its geological structure suggests that in the early Paleozoic it was either a series of island arcs or microcontinents separated by small oceanic basins, each having its own history of development. The cherty and volcanogenic-cherty deposits of the south-western Predchingiz Region and the North Balkhash Region in central Kazakhstan represent an ophiolite rock association with pelagic sediments. The Early-Middle Ordovician conodonts found in the cherty rocks are the only fossils useful for precise dating of the strata and for interpretation of the palaeobiogeographic relations. A low taxonomic diversity is typical of conodonts from these pelagic sediments. Most of them are of the Baltic type, and only some, like Paroistodus horridus and Histiodella tableheadensis, represent other, apparently more warm-water faunal elements. Deep-water conodont faunas from central Kazakhstan are coeval with the Early-Middle Ordovician conodonts from the shelf deposits of southern Kazakhstan, but the latter are taxonomically more diverse and contain warm-water forms (e.g., Juanognathus variabilis, Reutterodus andinus, Serratognathus bilobatus, and Bergstroemognathus extensus). This corroborates the idea that Kazkhstania was closer to the equator, than to the Baltic region in the Ordovician.

PL

Środkowy Kazachstan często bywa określany jako hipotetyczny paleozoiczny kontynent Kazachstania, chociaż budowa geologiczna wskazuje, że obszar ten we wczesnym paleozoiku był szeregiem łuków wysp lub mikrokontynentów, przedzielonych niewiekimi basenami oceanicznymi i mających własną historię geologiczną. Czerty i osady pochodzenia wulkaniczno-czertowego w pd.-zach. Regionie Przedczyngiskim i w Regionie Północnego Bałchaszu reprezentują zespół skał ofiolitowych z osadami pelagicznymi. Znajdowane w czertach konodonty są jedynymi skamieniałościami nadającymi się do dokładnego datowania tych utworów i ich interpretacji paleobiogeograficznej. Małe zróżnicowanie taksonomiczne jest typowe dla konodontów z osadów pelagicznych. Wiekszość należy do typu bałtyckiego, a tylko nieliczne np. Paroistodus horridus i Histiodella tableheadensis reprezentują inne, bardziej ciepłowodne elementy faunistyczne. Te głębokomorskie fauny odpowiadają wczesno- i środkowoordowickim zespołom konodontowym z osadów szelfowych południowego Kazachstanu, ale zespoły płytkowodne są bardziej zróżnicowane taksonomicznie i zawierają gatunki ciepłolubne (np. Juanognathus variabilis, Reutterodus andinus, Serratognathus bilobatus i Bergstroernognathus extensus). Potwierdza to pogląd, że Kazachstania w ordowiku leżała bliżej równika niż obszaru bałtyckiego.

Słowa kluczowe

PL

fauna kopalna; Kazachstan; taksonomia; osady pelagiczne; konodonty; ordowik; skamienialosci; paleozoik; paleontologia; skaly ofiolitowe

• Wydawca: -
• Czasopismo: Acta Palaeontologica Polonica
• Rocznik: 1998
• Tom: 43
• Numer: 1
• Opis fizyczny: s.53-68,rys.,tab.,fot.,bibliogr.

Twórcy

autor

Zhylkaidarov A

• Institute of Geological Sciences, Academy of Sciences of the Republic of Kazakhstan, Kabanbai batyr 69A, Almaty, 480100

Bibliografia

• Anonymous 1991. Proceedings of the 3rd Kazakhstanian Stratigraphical Conference on Precambrian and Phanerozoic [in Russian]. Alma-Ata.
• Apollonov, M.K. & Zhemchuzhnikov, V.G. (Žemčužnikov, V.G .) 1988. Lithostratigraphy of the Batyrbaisai section of Cambrian-Ordovician boundary deposits in Malyi Karatau [in Russian]. - Izvestia AN Kazakhskoj SSR, Seria geologičeskaci N 1, 20-36.
• Avdeev, A.V. 1984. Ophiolite belts and history of geological evolution of the Kazakhstan territory from a mobility point of view [in Russian]. - Sovetskaâ geologia 4, 63-72.
• Barnes, Ch.R. & Poplawski, M.L.S. 1973. Lower and Middle Ordovician conodonts from the Mystic formation. Quebec, Canada. -Journal of Paleontology 47, 760-790.
• Bergström, S.M. & Sweet, W.C. 1966. Conodonts from the Lexington limestone (Middle Ordovician) of Kentucky, and its lateral equivalents in Ohio and Indiana. -Bulletins of American Paleontology 50, 268-441.
• Dvoichenko, N.K. (Dvoičenko, N.K.) & Abaimova, G.P. 1987. Conodonts and biostratigraphy of volcanogenic-cherty deposits of Lower Paleozoic of Central Kazakhstan [in Russian]. - Trudy Instituta geologii i geofiziki SO AN SSSR 661, 160-178.
• Gridina, N.M. & Mashkova, T.V. (Maškova, T.V.) 1977. Conodonts in cherty-terrigenous deposits of Atasu anticlinorium [in Russian]. - Izvestia AN Kazahskoj SSR, Seria geologičeskacâ 6, 47-48.
• Koshkin, V.Ja. (Koškin, V.Â.) 1971. On the age of spilite-jasper complex of North Balkhash Region [in Russian]. In: Ju.A. Zaitsev (Û.A. Zaicev) et al. (eds), Precambrian Stratigraphy of Kazakhstan and Tian-Shan, 192-196. Izdatelstwo Moskovskogo Universiteta, Moskva.
• Koshkin, V.Ja. (Koškin, V.Â.), Abdrakhmanov, B.M. (Abdrahmanov, B.M.), Volkov, V.V., & Mertenov, V.M. 1987. Stratigraphy of Ordovician and Silurian terrigenous-cherty-basaltic formation of North
• Balkhash Region [in Russian]. Regional Geology and Geophysics of Kazakhstan, 6-15. KazIMS, Alma- Ata.
• Kurkovskaja, L.A. (Kurkovskab, L.A.) 1985. Complexes of conodonts from cherty and volcanogenic-cherty deposits of Ordovician of Central Kazakhstan [in Russian]. Geology of Early Syncline Complex of Central Kazakhstan, 164-177. Izdatelstvo Moskovskogo Universiteta.
• Löfgren, A. 1978. Arenigian and Llanvirnian conodonts from Jamtland, northern Sweden. -Fossils and Strata 13, 1-129.
• Löfgren, A. 1995. The probleme origin of the Ordovician conodont 'Cordylodus' horridus. - Geobios 28, 3, 371-377.
• Nikitin, I.F., Frid, N.M., & Zvontsov, V.S. 1991. Paleogeography and main features of volcanicity in the Ordovician of Kazakhstan and North Tien Shan. Zn: C.R. Barnes & S.H. Williams (eds), Advances in Ordovician Geology. - Geological Survey of Canada, Paper 90-9, 259-270.
• Nikitin, I.F., Zhylkaidarov, A.M. (Žylkaidarov, A.M.), & Frid, N.M. 1992. Ordovician cherty-basaltic complex of the South-Western Predchingiz Region [in Russian]. - Izvestia NAN RK, Seria geologičeskaâ 4, 57-70.
• Novikova, M.Z., Gerasimova, N.A., & Dubinina, S.V. 1983. Conodonts from volcanogenic-cherty complex of North Balkhash Region [in Russian]. - Doklady AN SSSR 271, 1449-1451.
• Peive, A.V. (ed.) 1980. The tectonics of North Eurasia (Explanatory note to the tectonic map of North Eurasia of scale 1: 5 000 000). Chapter 4 [in Russian], 77-98. Nauka, Moskva.
• Scotese, C.R. & McKerrow, W.S. 1991. Ordovician plate tectonic reconstructions. In: Ch.C. Barnes & C.H. Williams (eds), Advances in Ordovician Geology. - Geological Survey of Canada, Paper 90-9, 271-282.
• Seitov, N.S. 1992. Plate Tectonics: Possible Sources and Pecularities of Displaying [in Russian]. 199 pp. Gylym, Alma-Ata.
• Serpagli, E. 1974. Lower Ordovician conodonts from Precordilleran Argentina (Province of San Juan). - Bolletino della Societa Paleontologica Italiana 13, 17-98.
• Stouge, S.S. 1984. Conodonts of the Middle Ordovician Table Head Formation, western Newfoundland. -Fossils and Strata 16, 1-145.
• Stouge, S.S. & Bagnoli, G. 1988. Early Ordovician conodonts from Cow Head Peninsula, Western Newfoundland. - Palaeontographia Italica 75, 89-179.
• Van Wamel, W.A. 1974. Conodont biostratigraphy of the Upper Cambrian and Lower Ordovician of North-Western Öland, South-Eastern Sweden. - Utrecht Micropaleontological Bulletins 10, 1-126.
• Zhautikov, T.M. (Žautikov, T.M.) & Ivshin, N.K. (Ivšin, N.K.) 1971. About Lower Cambrian (Aldanian) age of the Erementau jasper-diabasic series of Chingiz [in Russian]. Conference on stratigraphy of pre-paleozoic and Paleozoic of Kazakhstan (Abstracts), 225-226. Alma-Ata.
• Zhylkaidarov, A.M. (Žylkaidarov, A.M.) 1988. On the age of volcanogenic-cherty deposits of Dzhungar-Balkhash region on conodonts. - Vestnik AN Kazahskoj SSR 5, 84-86.
• Zhylkaidarov, A.M. (Žylkaidarov, A.M.) 1990. The conodonts of the cherty-volcanogenic deposits of the Ordovician of Kazakhstan. The extracting technique and the results of the research [in Russian]. In: Problemy sovremennoj mikropaleontologii, 156-161. Nauka, Leningrad.
• Zvontsov, V.S. (Zvoncov, V.S.) & Frid, N.M. 1982. Balgashoky jasper-basaltic complex [in Russian]. In: Magmatic complexes of Kazakhstan. Chingiz-Tarbagatasay complex, 96-97. Alma-Ata.