litosphereЛитосфераLITHOSPHERE (Russia)1681-90042500-302XA.N. Zavaritsky Institute of Geology and Geochemistry10.24930/1681-9004-2019-19-2-250-268litosphere-1162Research ArticleСтатьиArticlesСистематика редкоземельных элементов, Y, Th, U и Mn в верхнедевонских конодонтах Западно-Уральской внешней зоны складчатости (Южный Урал)REE, Y, Th, U and Mn systematics of Upper Devonian conodonts in the West Uralian Folded Zone (Southern Urals)МасловА. В.MaslovA. V.

620016, г. Екатеринбург, ул. Акад. Вонсовского, 15; 450077, г. Уфа, ул. К. Маркса, 16/2.

15 Akad. Vonsovsky st., Ekaterinburg 620016; 16/2 Karl Marx st.,Ufa 450077.

amas2004@mail.ruАртюшковаО. В.ArtyushkovaO. V.

450077, г. Уфа, ул. К. Маркса, 16/2.

6/2 Karl Marx st.,Ufa 450077.

ТагариеваР. Ч.TagarievaR. Ch.

450077, г. Уфа, ул. К. Маркса, 16/2.

6/2 Karl Marx st.,Ufa 450077.

КиселеваД. В.KiselevaD. V.

620016, г. Екатеринбург, ул. Акад. Вонсовского, 15.

15 Akad. Vonsovsky st., Ekaterinburg 620016.

СтрелецкаяМ. В.StreletskayaM. V.

620016, г. Екатеринбург, ул. Акад. Вонсовского, 15.

15 Akad. Vonsovsky st., Ekaterinburg 620016.

ЧервяковскаяМ. В.ChervyakovskayaM. V.

620016, г. Екатеринбург, ул. Акад. Вонсовского, 15.

15 Akad. Vonsovsky st., Ekaterinburg 620016.

ЧередниченкоН. В.CherednichenkoN. V.

620016, г. Екатеринбург, ул. Акад. Вонсовского, 15.

15 Akad. Vonsovsky st., Ekaterinburg 620016.

Институт геологии и геохимии УрО РАН; Институт геологии УФИЦ РАН.РоссияA.N. Zavaritsky Institute of Geology and Geochemistry Urals Branch of RAS; Institute of Geology Subdivision of the Ufa Federal Research Centre of RAS.Russian FederationИнститут геологии УФИЦ РАН.РоссияInstitute of Geology Subdivision of the Ufa Federal Research Centre of RAS.Russian FederationИнститут геологии и геохимии УрО РАН.РоссияA.N. Zavaritsky Institute of Geology and Geochemistry Urals Branch of RAS.Russian Federation20191106201902250268Copyright © Маслов А.В., Артюшкова О.В., Тагариева Р.Ч., Киселева Д.В., Стрелецкая М.В., Червяковская М.В., Чередниченко Н.В., 20192019Маслов А.В., Артюшкова О.В., Тагариева Р.Ч., Киселева Д.В., Стрелецкая М.В., Червяковская М.В., Чередниченко Н.В.Maslov A.V., Artyushkova O.V., Tagarieva R.C., Kiseleva D.V., Streletskaya M.V., Chervyakovskaya M.V., Cherednichenko N.V.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.lithosphere.ru/jour/article/view/1162Объект исследований

Объект исследований. В статье обсуждаются результаты исследования систематики редкоземельных элементов (РЗЭ), Y, Th, U и Mn в конодонтах верхнего девона (аскынский (фран) и макаровский (фамен) горизонты, разрезы Куккараук, Ряузяк и Лемезинский) Западно-Уральской области передовой складчатости Южного Урала.

Методы

Методы. Конодонты из карбонатных пород выделены с использованием традиционной методики путем растворения их в органических кислотах, прежде всего муравьиной. Пробоподготовка и масс-спектрометрический анализ проведены в ИГГ УрО РАН в блоке чистых помещений (классы ИСО 6, 7). Измерения микроэлементного состава осуществлены на квадрупольном ИСП-масс-спектрометре ELAN 9000 (PerkinElmer). Измерение изотопных отношений Sm и Nd выполнено из 3%-го азотнокислого раствора на мультиколлекторном магнитосекторном масс-спектрометре с индуктивно-связанной плазмой Neptune Plus, Thermo Fischer. Долговременная воспроизводимость и правильность измерительной процедуры оценивались с помощью стандартного раствора Merck Nd, приготовленного на основе NIST Nd2O3 : 143Nd/144Nd = 0.511720 ± 15 (1 SD, n = 40).

Результаты

Результаты. В ходе исследований установлено, что особенности нормированных по PAAS спектров распределения лантаноидов в валовых (10.4–21.8 мг) пробах конодонтов, значения Ce аномалий, высокие величины ∑РЗЭ (173–1211 г/т) и ряд других параметров указывают на ведущую роль позднедиагенетических процессов в формировании свойственной конодонтам систематики РЗЭ. На это же указывают и присущие изученным выборкам конодонтов значения Y/Ho (≈26–32).

Выводы

Выводы. В целом распределение лантаноидов в конодонтах позволяет считать, что оно контролируется преимущественно литогенным (от 90 до более 99%) источником РЗЭ. Свойственные конодонтам аскынского и макаровского горизонтов величины εNd(t) (–4.0…–2.8) дают основание предполагать, что изотопный состав Nd в них либо сформирован под влиянием вод открытого океана, характеризовавшихся существенной долей радиогенного Nd, либо обусловлен поступлением более радиогенных вод океана в шельфовую зону на пике морской трансгрессии, имевшей место в рассматриваемом регионе в фамене. 

Research subject

Research subject. This article presents the results of a study undertaken to investigate the systematics of rare-earth elements (REE), Y, Th, U and Mn in the Upper Devonian conodonts of the Western Ural region of the foreland fold of the Southern Urals (Askyn and Makarovo horizons, Kukkarauk, Ryauzyak and Lemezinsky sections).

Methods

Methods. The conodonts were isolated from carbonate rocks using the conventional method of their dissolution in organic acids, mainly formic acid. Sample preparation and mass spectrometric analysis were carried out in the class 1000 and 10 000 cleanroom facilities of the Zavaritsky Institute of Geology and Geochemistry. A PerkinElmer ELAN 9000 quadrupole ICP mass-spectrometer was used to determine the concentration of the trace elements under study. Sm and Nd isotope ratios were measured from a 3% nitric acid solution by a Thermo Fischer Neptune Plus multicollector inductively coupled plasma mass-spectrometer. The long-term reproducibility and accuracy of the measurement procedure were evaluated using a standard Merck Nd solution based on the NIST Nd2O3 and yielded 143Nd/144Nd = 0.511720 ± 15 (1 SD, n = 40).

Results

Results. The established features of PAAS-normalised lanthanide distributions in the conodont bulk samples (10.4–21.8 mg), Ce-anomalies, high REE values (173–1211 ppm) and a number of other parameters indicate the leading role of late diagenetic processes in the formation of conodont REE systematics. This is also evidenced by the Y/Ho values (≈26–32) specific for the studied conodont samples.

Conclusions

Conclusions. In general, the distribution of lanthanides in the conodonts suggests that this process was mainly controlled by a lithogenic (from 90 to more than 99%) REE source. The εNd (t) (–4.0…–2.8) values characteristic of the cono donts of the Askyn and Makarovo horizons suggest that their Nd isotopic composition was either formed under the influence of the open ocean (island arc basin), characterised by a significant share of radiogenic Nd, or due to the entry of radiogenic waters of the ocean into the shelf zone at the peak of the marine transgression that took place in the region under consideration in the Famennian. 

Южный Уралверхний девонаскынский и макаровский горизонтыконодонтысистематика РЗЭYThU и MnSouthern UralsUpper DevonianAskyn and Makarovo horizonsconodontsREEYThU and Mn systematicОпределение микроэлементного состава и SmNd-изотопной систематики конодонтов выполнено при частичной поддержке РНФ (проект № 1617-10283) (Д.В. Киселева – определение микроэлементного состава конодонтов, М.В. Стрелецкая и М.В. Червяковская – определение Sm-Nd-изотопной систематики конодонтов).The analysis of microelement composition and Sm-Nd isotope systematics in conodonts was supported in part by RSF grant No. 16-17-10283 (D.V. Kiseleva, M.V. Streletskaya and M.V. Chervyakovskaya).ReferencesАбрамова А.Н. (1999) Франский ярус западного склона Южного Урала. Уфа: ИГ УфНЦ РАН, 55 с.Abramova A.N. (1999) Franskii yarus zapadnogo sclona Yuzhnogo Urala [The Frasnian of the Western slope of the Southern Urals]. Ufa, IG USC RAS, 55 p. 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The authors declare that there are no conflicts of interest present.