Ordovician deposits of the western slope of the Southern Urals and their correlation based on conodonts and chitinozoans

Mavrinskaya, T.M.; Yakupov, R.R.

doi:10.1016/j.rgg.2016.02.004

Cited by 4 publications

(1 citation statement)

References 7 publications

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“…Progress in the stratigraphy of the Ordovician of the territory to the west of the Main Uralian Fault has been marked by the recent publication of Mavrinskaya and Yakupov (2016), based on conodonts and chitinozoans, with carbon isotope analysis, conducted in Syktyvkar isotope laboratory, revealing the global Hirnantian event in the studied sections. Among publications on the stratigraphy of the Ordovician of the Sakmara allochthon, the book of Korinevsky (2013) and Ryazantsev's thesis (2012) must be mentioned.…”

Section: Paleozoicmentioning

confidence: 99%

New data on geology of the Southern Urals: a concise summary of research after the period of EUROPROBE activity

Пучков

2016

Solid Earth

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Abstract. The period of official activity of the EUROPROBE commission was conducted in the Urals with implementation of the URALIDES program, which stimulated many qualified geologists from western research institutes and universities to come to the region and work with local geologists on topical problems of Uralian geology. The author aims to answer questions as to what interesting results have been obtained in the Southern Urals in the last decade, after most foreign researchers left the Urals, and how these results correspond to the scientific conclusions that had been reached before.

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Section: Paleozoicmentioning

confidence: 99%

New data on geology of the Southern Urals: a concise summary of research after the period of EUROPROBE activity

Пучков

2016

Solid Earth

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Upper Ordovician–Lower Silurian deposits in the Zakola section (Ilych River, Northern Urals): Composition, structure, formation environments

Shmeleva

2024

Lithosphere

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Research subject. Section of boundary deposits, exposed in the right side of the Zakola stream (the right tributary of the Ilych River, Northern Urals) with a total thickness of 98 m, presented with rock samples (more than 100 pieces), thin sections (100 pieces), slabs (10 pieces), and chemical analyses (15 pieces). Aim. Detailed description of the most complete section of the Upper Ordovician–Lower Silurian boundary sediments of the Shantym facies complex with a stratigraphic reference of layers, lithological typification of sediments, and restoration of sedimentation conditions. Methods. Conventional lithological and paleontological methods were used to dissect the section. Sampling was carried out after 1 m; however, samples were additionally taken when detailed observations were possible to identify lithological and facial differences. The thin sections were studied by the classic method of optical microscopy. The study of the fauna complex was carried out both by collecting samples of the author’s rocks and by the materials of A.I. Antoshkina. In addition, stock materials were attracted. Results. In the section, 14 packs of rocks were identified, which are represented by 6 lithological types of secondary dolomites. Their distribution along the section, along with the presence of characteristic faunal remains, made it possible to establish three members in the section, which can be correlated with the Katian, Hirnantian, and Ruddanian stages of the General Stratigraphic Scale. Conclusion. The Katian deposits are represented by the Yaptikshor Formation (Strata 1), which was formed under the conditions of the lower sublittoral of a ramp-type carbonate platform with a transgressive carbonate tract and a diverse fauna. The beginning of the Hirnantian (Strata 2) is characterized by shallow water conditions of the upper sublittoral up to the littoral, which reflects a sharp shallowing at the Katian–Hirnantian boundary and corresponds to the beginning of the global early Hirnantian regression. The rocks exposed higher up the section indicate sedimentation with a certain rise in the sea level; however, the correlation of this part of the section with the upper part of the Verkh Ruchey Formation is complicated by the fragmentary nature of the outcrops. The overlying Ruddanian deposits (Strata 3) were accumulated on the outskirts of a ramp-type carbonate platform under the conditions of the lower sublittoral, which corresponds to the beginning of the Early Silurian global transgression.

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Main Ordovician–Silurian events in the South Ural and event stratigraphy regional tasks

Yakupov

2023

Geol. vestn.

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The main regional abiotic events of the Ordovician and Silurian of the Southern Urals are manifested in the restructuring of sedimentation in the paleobasin. Eustatic fluctuations and tectonic motions primarily cause changes in the lithological composition of strata. Geochemical events influence the isotopic composition of elements. Biotic events affect biodiversity in micro- and macrofauna complexes. The largest of the five Phanerozoic extinctions was the global extinction event at the Ordovician–Silurian boundary (LOME). The Ordovician biotic diversification event (GOBE) is divided into three phases. The Darrivillian level of manifestation of this event is noted in the Southern Urals. The location of the global biotic events GOBE, LOME, and the geochemical event HICE in the sections of the Southern Urals is substantiated. Based on the analysis of the connection between biotic and abiotic events in the Ordovician-Silurian deposits of the Southern Urals, the significant role of conodonts, graptolites, chitinosoans and their correlation potential were revealed. Insufficient knowledge of the sections makes it possible to correlate regional events with certain assumptions. In order to carry out global event correlations, in addition to the comprehensive biostratigraphic characteristics of the Ordovician and Silurian deposits of the Southern Urals, geochemical studies of a number of sections are necessary. The most promising sections for identifying event levels are the sections of the western slope of the Zilair synclinorium: Nabiullino, Maksyutovo, Gremyachiy, Kaga-V.Avzyan, Sermenevo.

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Ordovician deposits of the western slope of the Southern Urals and their correlation based on conodonts and chitinozoans

Cited by 4 publications

References 7 publications

New data on geology of the Southern Urals: a concise summary of research after the period of EUROPROBE activity

New data on geology of the Southern Urals: a concise summary of research after the period of EUROPROBE activity

Upper Ordovician–Lower Silurian deposits in the Zakola section (Ilych River, Northern Urals): Composition, structure, formation environments

Main Ordovician–Silurian events in the South Ural and event stratigraphy regional tasks

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