Carbon isotope stratigraphy of the Tournaisian (Lower Mississippian) successions of NE Europe

Журавлев, А. В.; Plotitsyn, A. N.; Gruzdev, D.A.; Смолева, И. В.

doi:10.1016/bs.sats.2020.08.007

Cited by 8 publications

(9 citation statements)

References 23 publications

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“…Exposed Tournaisian deposits of the Malaya Usa River basin are represented mainly by two types of sections: 1) predominantly carbonate deposits with siliceous nodules of a shallow-water carbonate platform of the Vazhhanovey Formation (Shishkin et al 2007;Zhuravlev & Plotitsyn 2017); 2) siliceous-carbonate relatively deep-water shelf deposits of the Buredan Formation (Kolesnik 1993; Shishkin et al 2007;Plotitsyn et al 2018a). The Siphonodella praesulcata, S. sulcata, S. bransoni, S. duplicata, S. wilberti, S. mehli, S. uralica, S. lobata, S. obsoleta, S. sandbergi, S. cooperi, S. carinthiaca, S. quadruplicata, S. gladia, S. crenulata Zone) is marked by a lighter carbon isotopic composition (within 1-2 ‰), similar to data from other sections of the Ural region (Sobolev 2011;Plotitsyn 2016;Plotitsyn et al 2018a;Mizens et al 2015;Zhuravlev et al 2020) and some other regions of the world (Buggisch et al 2008;Yao et al 2015).…”

Section: Methodssupporting

confidence: 81%

NEW GROUP OF TOURNAISIAN ADVANCED <em>SIPHONODELLA</em> (CONODONTS, LOWER CARBONIFEROUS)

Plotitsyn

2022

RIPS

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A new morphological group of advanced Siphonodella with diagonal or/and longitudinal ribbed ornamentation on the upper side of the platform of the P1 elements was identified and described based on the author's paleontological material from the Polar Urals and published data from East European, Central, and Northeast Asian successions. The group includes two valid species Siphonodella nandongensis Li and Siphonodella vladimirovi Plotitsyn nom. nov. Due to the low representativeness of the paleontological material, eight taxa are described in an open nomenclature under the species names Siphonodella sp. A-H. Siphonodella vladimirovi is described as a nomen novum in accordance with the recommendations of the International code of zoological nomenclature (previously identified species appeared under the invalid species names Siphonodella diagonalica Pazukhin or Siphonodella zeravshanica Bardasheva). It is assumed that the species Siphonodella nandongensis Li, Siphonodella vladimirovi Plotitsyn, and Siphonodella sp. A-H came from morphologically similar species from the cosmopolitan group or as descendants of the East European group.

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Section: Methodssupporting

confidence: 81%

NEW GROUP OF TOURNAISIAN ADVANCED <em>SIPHONODELLA</em> (CONODONTS, LOWER CARBONIFEROUS)

Plotitsyn

2022

RIPS

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“…Важным контролирующим фактором была фиксация следов значительной пе-Характеристика верхнетурнейских отложений Верхнеусинского опускания (Полярный Урал) Features of the upper Tournaisian deposits in the Verkhnyaya Usa depression (Polar Urals) рекристализации и окремнения в шлифах, такие образцы должны попадать в разряд "сомнительных" и, по возможности, исключаться из работы. Далее использовалась составная диаграмма скрининга (Zhuravlev et al, 2020), на которой по соотношению δ 13 C карб и δ 18 O карб выделяются области, где первичная природа полученного изотопного сигнала маловероятна. Как видно на рис.…”

Section: материал и методыunclassified

Section: литолого-палеонтологическая характеристика разрезаunclassified

“…На диаграмме серым цветом выделена область значений, характерных для вторичных преобразований карбонатных пород, по (Zhuravlev et al, 2020). The field of results of secondary processes in carbonate rocks is gray, by (Zhuravlev et al, 2020) а -схема административного районирования севера европейской части России; б -палеогеографическая схема северовостока Лавруссии для турнейского века, по (Zhuravlev et al, 2020). 1 -низменная суша, 2 -внутренняя часть карбонатной платформы, 3 -внешняя часть карбонатной платформы, 4 -глубоководно-шельфовая впадина, 5 -изолированная карбонатная платформа, 6 -батиаль; в -схема расположения района работ; г -схема раcположения обн.…”

Section: литолого-палеонтологическая характеристика разрезаunclassified

“…На примере разреза оценивается стратиграфическое значение изотопной структуры позднетурнейской изотопной аномалии (событие TICE) при датировке относительно глубоководных (депрессии в пределах шельфовой области) толщ, убедительность определения стратиграфического объема которых вызывает вопросы. Важно отметить, что ранее со стратиграфической точки зрения турнейские отложения Верхнеусинского опускания характеризовались в общих чертах при обобщающих тематических исследованиях (Чернов, 1962, 1972) и геологическом картировании (см., например, (Шишкин и др., 2013)) либо при исследованиях, охватывающих преимущественно нижнюю и среднюю части яруса (Плотицын и др., 2018б;Zhuravlev et al, 2020). Таким образом, детальные стратиграфические исследования отложений позднетурнейского возраста Верхне усинского опускания в данной работе описываются впервые.…”

Section: Introductionunclassified

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Features of the sedimentation, stratigraphy and carbon isotope record of the upper Tournaisian of the Verkhnyaya Usa depression (Polar Urals)

et al. 2023

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Research subject. Upper Tournaisian clayey-siliceous-carbonate deposits of the Malaya Usa section (Polar Urals).Material and methods. The composition and structure of the deposits (50 samples, 51 thin sections) of the section were considered to determine the conditions of sedimentation; 13 samples were chemically disintegrated in 7–10% solution of acetic acid, and thin sections were studied for biostratigraphic analysis (conodonts, ostracods, and foraminifers); the carbon and oxygen isotopic composition of carbonate deposits (49 samples) were analyzed. A three-stage screening test of samples for isotopic-studies was carried out.Results. The Malaya Usa section comprises mainly micritic limestones with fossils silicified to various degree (wackstone to packstone). The features and composition of the sediments indicate sedimentation in low dynamic conditions below the wave base. Biostratigraphic analysis is based on the identification of foraminifers, as well as a few conodonts and ostracods. Foraminifers characterize the Eotextularia diversa–Dainella chomatica Zone, which is approximately comparable to the Upper typicus–anchoralis–latus conodont zonal interval and Entomoprimitia malinovkaensis‑Marginia tschigovae ostracode zones of the top of the Tournaisian. The isotope-geochemical data obtained from the section demonstrate a general lightening trend in the isotopic composition of δ13Ccarb up the section. This trend, along with the biostratigraphic data, mades it possible to compare the δ13Ccarb sequence of the Malaya Usa section with sequences from a number of geographically separated sections of the world (Belgium, South China, USA), which are considered as the Tournaisian isotope carbon event (TICE).Conclusions. The deposits of the studied section were probably formed under the conditions of a very gentle slope (ramp), where the material accumulated at the foot as a filling sequence in the southern part of the Korotaikha intrashelf paleodepression. Using the Malaya Usa section as an example, it is shown that not only the peak positive deviations of the TICE in the upper part of the isosticha Zone and in the lower part of the typicus Zone, but also the isotopic structure of the upper Tournaisian has a significant correlation potential. The use of the isotope-geochemical method as an auxiliary application to biostratigraphy made it possible to improve the age determination of the section from the interval of the Upper typicus–anchoralis–latus conodont zonal interval to the Upper typicus Zone of the standard conodont zonation.

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The middle–late Tournaisian crisis in conodont diversity: a comparison between Northeast Laurussia and Northeast Siberia

Журавлев

Plotitsyn

2022

Palaeoworld

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Carbon isotope stratigraphy of the Tournaisian (Lower Mississippian) successions of NE Europe

Cited by 8 publications

References 23 publications

NEW GROUP OF TOURNAISIAN ADVANCED <em>SIPHONODELLA</em> (CONODONTS, LOWER CARBONIFEROUS)

NEW GROUP OF TOURNAISIAN ADVANCED <em>SIPHONODELLA</em> (CONODONTS, LOWER CARBONIFEROUS)

Features of the sedimentation, stratigraphy and carbon isotope record of the upper Tournaisian of the Verkhnyaya Usa depression (Polar Urals)

The middle–late Tournaisian crisis in conodont diversity: a comparison between Northeast Laurussia and Northeast Siberia

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