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Late Devonian Syv'yu River Section, Timan-Pechora Basin, Northwestern Russia

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Late Devonian Syv'yu River Section, Timan-Pechora Basin, Northwestern Russia Bollettino della Società Paleontologica Italiana Modena, Novembre 1999 Late Devonian Syv'yu River Section, Timan-Pechora Basin, Northwestern Russia Norman M. SAVAGE Alexandra B. YUDINA Department of Geologica! Sciences Institute of Geology University ofOregon Russian Academy of SClences KEYWORDS- Conodonts, Biostratigraphy, Lithostratigraphy, Late Devonian, Subpolar Urals, Timan-Pechora Basin, Russia. ABSTRACT- This paper deals with the Upper Devonian conodont biostratigraphy in the Syvyu River section (western Subpolar Urals), one of the most complete Frasnian-Famennian sequences within the Timan-Pechora Basin (Russia). Lithostratigraphically, the Upper Devonian sequence in the section is subdivided, in ascending order, into the Kedzydshor, vorota, Sharyu and Domanico id Formations. The jollowing zones oj the Late Devonian standard conodont zonation have been recognized: in the Frasnian, Early and Late falsiovalis, transitans, punctata, Early and Late hassi, jamieae, Early and Late rhenana, and linguiformis Zones; in the Famennian - Early, Middle and Late triangularis, Late crepida, and Early marginifera Zones. The Middle falsiovalis Zone is no t recognizable because ofan hiatus probably spanning an interval from the late Early(?) falsiovalis to the earliest p art ofthe Late falsiovalis Zone. Ancyrodella and Ancyrognath us are rare. Icriodus is generally rare but common in argillaceous limestones at the Frasnian-Famennian boundary. RIASSUNTO- [La Sezione tardo-devoniana di Syv'yu River, Timan-Pechora Basin, NW Russia] - Viene illustrata la biostratigrafia a conodonti della sezione di Syvyu River, nella parte settentrionale degli Urali; la sezione studiata rappresenta una delle successioni Frasniane- Famenniane più complete del Timan-Pechora Basin (Russia). Da un punto di vista litostratigrafico, le rocce affioranti nella sezione vengono ricondotte alle seguenti formazioni, dalla base al tetto: Kedzydshor, vorota, Sharyu e Domanicoid. Le seguenti biozone a conodonti della Biozonatura Standard del Devoniano Superiore sono state identificate: nel Frasniano, Early e Late falsiovalis, transitans, punctata, Early e Late hassi, jamieae, Early e Late rhenana, and linguiformis; nel Famenniano, Early, Middle e Late triangularis, Late crepida, e Early marginifera. La Middle falsiovalis Zone non è stata riconosciuta a causa di uno hiatus, che probabilmente riguarda un intervallo compreso tra la parte superiore della Early(?) falsiovalis Zone e la parte basale della Late falsiovalis Zone. Ancyrodella and Ancyrognathus sono rari. Icriodus è di norma raro, ma diviene abbondante nei calcari argillosi attorno al limite Frasniano-Famenniano. REGIONAL SETTING LATE DEVONIAN SYV'YU RIVER SECTION The Timan-Pechora Basin is located in the north- In the Late Devonian the territory of the Pechora east of the East European Platform. Structurally i t is P late was occupied by an epicontinentai sea. In generai, considered as the Pechòra P late, limited to the west by there are three structural-facies complexes, the East-Timan Thrust and to the east by the Main corresponding to three zones of the Urais paiaeo-ocean: Urals Thrust (Text-fìg. 1). The basin comprises an l) shelf (inner shailow-water, middle, externai deep Upper Proterozoic basement overlain by Paleozoic- shelves), 2) continentai slope and 3) bathyal (so-called Cenozoic sedimentary cover. The basement consists of Lemva facial type) (Yudin & Dedeev, 1987; Yudin, metamorposed rocks represented by green schists, 1994). The Upper Devonian facies plan was established quartzites, sandstones, dolostones, limestones and as a result of the latest Givetian (?)-Frasnian onlap, intrusive rocks. Within the Timan Ridge and Urais, drowning vast areas of the Russian Platform eastern the rocks of the basement are exposed in the higher margin, that was caused by both tectonic activities an d area, but o n the platform they are buried to a signifìcant eustatic sea-level fluctuations. depth and have been reveaied only by deep drilling. The Syv'yu River section studied is located in the The sedimentary cover consists of three structurally western Subpolar Urais, and iso ne of the most complete separated stratigraphic sequences: l) Upper Cambrian- Middle and Upper Devonian sequences of the Lower Devonian, 2) Middle Devonian-Triassic (Lower Domanic type. Structuraily, the area belongs to the Jurassic?), and 3) Middle Triassic-Recent. The thickness West-Urais structural Zone where Devonian deposits of cover changes from 4-7 km in the centrai part within are widespread (Text-fìg. 2). The Upper Devonian the Pechora Syneclise to l 0-14 km in the P re-Urais deposits in the area are represented by three faciai types foredeep. Within some of the uplifts and domes the (in Novakova, 1991; Text-fìg. 3): l) a Domanic type, sedimentary thickness does not exceed 3-4 km, and wide-spread in the west of area, characterized by on the Timan Ridge i t is reduced to zero. relatively deep-water bituminous sediments of a 362 NM SAVAGE, A.B. YUDINA BARENTS SEA "' > c z V' o (" o -' 1' -t c. Text-fìg. 2 - Geologica! and structural map of the Subpolar Urals .<> and Pre-Urals, showing a distribution of Devonian ( deposits. Legend: Largest regional and large thrusts: WCT = West-Chernyshev, MWUT = Main West- f Urals, FT = Frontal, MUT = Main Urals; 1-2) srruc- ture-formational complexes: l = carbonate shelf O 50 !OOk.m (Elets), 2 = shale bathyal (Lemva allochronous); I) 3' lat=:loot:::l Pre-Urals foredeep; II-III) Urals fold-thrust belt: II = Western structure zone (a= Kozhim Uplift, b = Lemva depression), III = Eastern structure zone. Text-fìg. l - Structural map of the Pechora P late. almost continuous sequence of the Domanic facies type through the Frasnian and Lower Famennian, and comprise thinly bedded, westerly dipping strata, without structural complications. They are exposed stagnant intra-shelf basin, with siliceous, terrigenous, along the right bank of Syv'yu River in outcrops 1-4 and carbonate components; 2) a carbonate type, (Text-fig. 4). common in the eastern part of the area, represented by organo-clastic, organo-clotted, detritic, stromato- poroid-algal, an d oncolitic limestones deposited within PREVIOUS WORKS a shelf carbonate shoal; 3) relatively deep-water shale- carbonate deposits transitional to the bathyal (Lemva) Modern stratigraphic studies of the Upper type, that accumulateci eastward from the carbonate Devonian deposits in the Subpolar Urals stem from shoal. the work of A. I. Pershina (Pershina et al., 1971), w ho The Syv'yu River section is located about 38 km subdivided the successi o n into regional horizons of the upstream from its junction with the Kozhim River. The Urals Stratigraphic Chart. The Frasnian deposits were Upper Devonian deposits in this section represent an subdivided using the macrofauna into the Pashiya, Kyn EXPLANATION OF PLATE l Fig. l - Palmatolepis linguiformis Mi.iller, 1956. x 80. Figs. 2-4 - Palmatolepis juntianensis Han, 1987. 2-3) x 80; 4) x 90. Figs. 5-6 - Palmatolepis rhenana Bischoff, 1956. 5) x 55; 6) x 60). Fig. 7 - Palmatolepis nasuta Mi.iller, 1956. x 65. Fig. 8 - Palmatolepis praetriangularis Ziegler & Sandberg, 1988. juvenile specimen; x 125. Figs. 9-11 - Palmatolepis hassi Mi.iller & Mi.iller, 1957. 9) x 110; lO) x 100; 11) x 105. All specimens from horizon CB2-125. NM. SAVAGE, A.B. YUDJNA, LATE DEVONIAN CONODONTS FROM NW RUSSIA P!. l 364 NM. SAVAGE, A.B. YUDINA l l l l l l l N l 1 l l"' 37' l 35' 1 1 l l 1 4 1 1 1 l&m z5• l l -J z5' l 1 1 m-1, l C,t 1 . l l l l l!r .x_.J l . l l m '.J l 3VII!t-w · l 1 1 1 l • ... • 30'1 S I l l l -1 l q l l l Il l l 16;,1 l-/Il/ D,fm / l !q/ l @l l l 1 l l l l l D,tk l l l Text-fìg. 3- Map showing distribution ofFrasnian and Famennian l deposit types in the Kozhim River basin (Subpolar l l Urals). Legend: 1-4) deposits types: l = relatively deepwater depressional (clayey-siliceous-carbonate); 2 = shelf shoal carbonate; 3, 4 = relatively deepwater Text-fìg. 4- Outcrop map of the Syv'yu River section. shale-carbonate one transitional to the Lemva type; 4 = the Syv'yu River section. Horizon). Many of the conodonts from this section were simultaneously identified by L. S. Kolesnik. In the conodont study the carbonate-terrigenous deposits Horizons (Lower Frasnian), Sargaevo, Domanik considered by A. I. Pershina as the Shar'yu Sui te, Askyn Horizons and Shar'yu Suite (Middle Frasnian), and an d Barma Horizons were dated as being ofFamennian Askyn, and Barma Horizons (Upper Frasnian). The age. Famennian was subdivided into Lower and Upper In 1987 the Frasnian and Lower Famennian Famennian Substages. succession in the Syv'yu River section was measured The Upper Devonian conodont faunas from the by A. B. Yudina togetherwith V.S. Tsyganko. Some data section were first studied by Yu. Deulin (1978). He on the Upper Devonian biostratigraphy and recognized Polygnathus asymmetricus asymmetricus, lithostratigraphy of the section were published earlier Ancyrognathus triangularis, Palmatolepis rhenana and (Tsyganko 1994; Yudina 1989, 1994). A.B. Yudina has Palmatolepis triangularis Zones in Frasnian, an d Palma- recognized the standard conodont zones an d beds with tolepis crepida, Pa. rhomboidea. Pa. quadrantinodosa, faunas, including the Ancyrodella pristina, A. Scaphignathus velifer, Polygnathus styriaca and rotundiloba, Polygnathus timanicus and Pa[matolepis gigas Spathognathodus costatus Zones in Famennian. Later, Zones in the Frasnian. It was noted that the in the course oflarge-scale mapping, the zonation was Ancyrognathus triangularis Zone cannot be recognized changed and correlateci with regional horizons of the in the section because of the index species of the zone western Urals. These included in the Frasnian, the first appears above in the Pa. gigas Zone. In the Ancyrodella binodosa Zone (Pashiya and Kyn Horizons), Famennian, the Middle and Upper Pa. triangularis A. rotundiloba Zone (Sargaevo Horizon), Polygnathus Zones, the Pa.
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