The First Results of U–Th–Pb Isotopic Dating of Detrital Zircons from the Chenka Sandstones: A Contribution to the Stratigraphy of the Cimmerides of Mountainous Crimea

Kuznetsov, N.B.; Strashko, A.V.; Romanyuk, T.V.; Nikishin, A.M.; Moskovsky, D.V.; Novikova, A.S.; Dubeskiy, A.S.; Erofeeva, K.G.; Sheshukov, V.S.

Авторы: Kuznetsov N.B., Strashko A.V., Romanyuk T.V., Nikishin A.M., Moskovsky D.V., Novikova A.S., Dubeskiy A.S., Erofeeva K.G., Sheshukov V.S.
Журнал: Stratigraphy and Geological Correlation
Том: 32
Номер: 3
Год издания: 2024
Издательство: Pleiades Publishing, Inc.
Местоположение издательства: New York, USA
Первая страница: 265
Последняя страница: 293
Аннотация: The first results of U–Th–Pb isotope dating of detrital zircons (dZr) from the Chenka sandstonesof the Cimmerides of Mountainous Crimea are presented. Carboniferous–Triassic dZr dominate among dZrfrom Chenka sandstones. Analysis of previously obtained sets of dZr ages from the age and lithologically differentformations of Cimmerides of Mountainous Crimea has revealed certain regularities in the change inthe time of the provenance signal and, accordingly, of the provenance areas, whose erosion products composethe studied formations. A comparison of the obtained of U–Pb ages of dZr from Chenka sandstones withsimilar dates obtained for sandstones from the Upper Triassic–Jurassic formations has shown that the provenancesignals of the Chenka sandstones and Upper Triassic–Lower Jurassic flysch strata are different, butthe provenance signals of the Chenka sandstones and Middle–Upper Jurassic coarse clastic strata are similar.Detrital zircons from the Chenka sandstones show that the parameters of the Th–U distribution in them areintermediate between those from sandstones of flysch and coarse-grained strata, respectively. In general, theisotope-geochronological and geochemical data we obtained and some features of the internal structure ofdZr grains from the Chenka sandstones can be used as a strong argument in favor of considering Chenkasandstones as an independent stratigraphic unit with an age not older than the Middle Jurassic. The similarityof the characteristics of dZr grains from sandstones of the Chenka sandstones with those from Middle–UpperJurassic sandstones casts doubt on the correlations of the Chenka sandstones with a number of lithologicallysimilar units of the southwestern regions of Mountainous Crimea, specified as Early Jurassic in age based onfinds of fossil remains.
Добавил в систему: Никишин Анатолий Михайлович

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The First Results of U–Th–Pb Isotopic Dating of Detrital Zircons from the Chenka Sandstones: A Contribution to the Stratigraphy of the Cimmerides of Mountainous Crimeaстатья

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