First U-Pb (CA-ID-TIMS) Dating of the Uppermost Permian Coal Interval in the Minusinsk Coal Basin (Siberia, Russia) Using Zircon Grains from Volcanic Ashfalls / Vladimir V. Silantiev, Sergey I. Arbuzov, Marion Tichomirowa [et al.]

Set Level: Minerals, Basel, MDPI AGCoauthor: Silantjev, V. V., Vladimir Vladimirovich;Arbuzov, S. I., Russian geologist and geochemist, Professor of Tomsk Polytechnic University, Doctor of geological and mineralogical sciences, 1959-, Sergey Ivanovich;Tikhomirova, M., Marion;Kessner, A., Alexandra;Izmailova, A. K., Alsu;Iljenok (Il'enok), S. S., geochemist, assistant Professor of Tomsk Polytechnic Institute, 1986-, Sergey Sergeevich;Soktoev, B. R., Geochemist, Associate Professor of the Department of Tomsk Polytechnic University, Candidate of Geological and Mineralogical Sciences, 1990-, Bulat Rinchinovich;Nurgalieva, N. G., Nouria;Gutak, Y. M., Yaroslav Mikhaylovich;Felker, A. S., Anastasiya Sergeevna;Porokhovnichenko, L. G., Lyubov Georgievna;Eliseev, N. A., Nikolay Alekseevich;Zharinova, V. V., Veronika Vladimirovna;Nurieva, E. M., Evgeniya Mikhaylovna;Urazaeva, M. N., Milyausha NazimovnaCorporate Author (Secondary): National Research Tomsk Polytechnic University, (2009- )Language: английский.Country: Switzerland.Abstract: This study presents the first U-Pb (CA-ID-TIMS) radioisotopic dating of zircon grains extracted from tonsteins within the uppermost Permian coal interval of the Minusinsk Coal Basin (Siberia, Russia). Petrographic, structural, and mineralogical analyses confirm the volcanic ash origin of the tonsteins. The parent pyroclastic materials are identified as rhyolite–pantellerite for tonstein I-22 and dacite–rhyodacite for tonstein I-12. Morphological analysis of zircon crystals, along with cathodoluminescence and melt inclusion studies, confirms their volcanic origin and crystallisation temperatures of 700–900 °C. New radioisotopic dates of 261.4 ± 0.7 Ma and 261.3 ± 0.4 Ma clarify the age of the Izykh Formation, enabling its direct correlation with the Capitanian Stage of the International Chronostratigraphic Chart. The results emphasise the possible discontinuity of the coal-bearing succession of Siberian palaeocontinent and highlight the potential for further stratigraphic refinement through continued radioisotopic dating of tonsteins..Bibliography: References: 99 tit..Subject: Siberia | Permian | tonstein | ashfalls | U-PB dating | CA-ID-TIMS | geochronology | biostratigraphy | электронный ресурс | труды учёных ТПУ Online Resources:http://earchive.tpu.ru/handle/11683/132460 | https://doi.org/10.3390/min14100982
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References: 99 tit.

This study presents the first U-Pb (CA-ID-TIMS) radioisotopic dating of zircon grains extracted from tonsteins within the uppermost Permian coal interval of the Minusinsk Coal Basin (Siberia, Russia). Petrographic, structural, and mineralogical analyses confirm the volcanic ash origin of the tonsteins. The parent pyroclastic materials are identified as rhyolite–pantellerite for tonstein I-22 and dacite–rhyodacite for tonstein I-12. Morphological analysis of zircon crystals, along with cathodoluminescence and melt inclusion studies, confirms their volcanic origin and crystallisation temperatures of 700–900 °C. New radioisotopic dates of 261.4 ± 0.7 Ma and 261.3 ± 0.4 Ma clarify the age of the Izykh Formation, enabling its direct correlation with the Capitanian Stage of the International Chronostratigraphic Chart. The results emphasise the possible discontinuity of the coal-bearing succession of Siberian palaeocontinent and highlight the potential for further stratigraphic refinement through continued radioisotopic dating of tonsteins.

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