Ашық рұқсат Ашық рұқсат  Рұқсат жабық Рұқсат берілді  Рұқсат жабық Тек жазылушылар үшін

Том 32, № 3 (2024)

Мұқаба

Бүкіл шығарылым

Ашық рұқсат Ашық рұқсат
Рұқсат жабық Рұқсат берілді
Рұқсат жабық Тек жазылушылар үшін

Sources of the Upper Proterozoic Terrigenous Deposits in the Northwestern Part of the Argun Massif, Central Asian Fold Belt: Results of U–Th–Pb Geochronological and Sm–Nd Isotopic-Geochemical Studies

Smirnova Y., Kurilenko A., Dril S., Khubanov V.

Аннотация

The publication presents the results of geochemical, isotopic-geochemical (Sm–Nd) and isotopic-geochronological (U–Th–Pb) studies of terrigenous rocks of the Middle Riphean (?) Nadarov formation and the Upper Riphean (?) Nortui formation of the northwestern part of the Argun continental massif. Features of the material composition of the deposits indicate the presence of formations of various silicia acidity in the source area. According to Sm–Nd data, sedimentary rocks of the Nadarov and Nortui formations are characterized by negative values åNd(t) = –6.6…–3.5 at Early Proterozoic values of Nd model age (tNd(DM) = 2.0–1.8 Ga). According to U–Th–Pb dating of grains of detrital zircon, it was defined that the lower age limit of accumulation of terrigenous deposits of the Nadarov and Nortui formations falls at the Late Riphean (~775 and ~ 744 Ma, respectively). The main provenances area for them were Late Riphean igneous rocks with the participation of Early Proterozoic rocks, extended in the structure of the Argun massif.

Stratigrafiâ. Geologičeskaâ korrelâciâ. 2024;32(3):3-31
pages 3-31 views

Geological Correlation of the Mubarak (Southern Tien Shan) and Podhale (Inner Carpathians) Flysch Basins

Leonov M.

Аннотация

A comparative analysis and correlation of “atypical” flysch formations of the Tien Shan and the Carpathians is carried out in order to distinguish between local (regional) and general (interregional) features of their structure and place in the evolution of mobile belts. The objects of the study were the Upper Carboniferous flysch of the Khanaka syncline (Tien Shan) and the Upper Eocene flysch of the Podhale syncline (Carpathians). Using historical and geological analysis based on the study of lithostratigraphy, tectonic structure and geodynamic position of objects, a comparative characteristic of the flysch of the Khanaka syncline and the flysch of the Podhale syncline was carried out for the first time. The selected objects belong to different mobile belts and tectonic cycles; similar in internal structure and in non-standard tectonic position for flysch; they have some features that are not peculiar to flysch: formation on a quasi-platform basement, a significant volume of conglomerates, a simple configuration of geological bodies, the absence of internal deformations, and a narrow time interval of formation. On the basis of a comparative analysis, it was established that the studied objects belong to a special variety of flysch, which is proposed to be designated as the “final flysch of the inner massifs of mobile belts”, the formation of which reflects the specifics of the geodynamic evolution of the Hercynian and Alpine mobile belts.

Stratigrafiâ. Geologičeskaâ korrelâciâ. 2024;32(3):32-55
pages 32-55 views

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 the Mountainous Crimea

Kuznetsov N., Strashko A., Romanyuk Т., Nikishin А., Moskovsky D., Novikova A., Dubenskiy A., Erofeeva K., Sheshukov V.

Аннотация

The first results of U–Th–Pb isotope dating of detrital zircons (dZr) from the Chenka sandstones of the Cimmerides of the Mountainous Crimea are presented. Carboniferous–Triassic dZr dominate among dZr from Chenka sandstones. Analysis of previously obtained sets of dZr ages from the different-age and lithology formations of Cimmerides of the Mountainous Crimea has revealed the certain regularities in the change in time of the provenance signal and, accordingly, of the sources, the erosion products of which compose the studied formations. A comparison of the obtained of U–Pb ages of dZr from Chenka sandstones with similar data for sandstones from the Upper Triassic–Jurassic formations has shown that the provenance signals of the Chenka sandstones and Upper Triassic–Lower Jurassic flysсh strata are different, but the provenance signals of the Chenka sandstones and Middle–Upper Jurassic coarse clastic strata are similar. Detrital zircons from the Chenka sandstones are characterized by the parameters of the distribution of Th/U values intermediate between those from sandstones of flysch strata and from sandstones of coarse-grained strata. In general, the obtained isotope-geochronological and geochemical data and some features of the internal structure of dZr from the Chenka sandstones can be used as a strong argument in favor of interpretation of Chenka sandstones as an independent stratigraphic unit with an age not older than the Middle Jurassic. The similarity of the characteristics of dZr from sandstones of the Chenka sandstones with those of Middle–Upper Jurassic coarse clastic sequences casts doubt on the correlations of the Chenka sandstones with a number of lithologically similar units of the southwestern regions of the Mountainous Crimea, specified as Early Jurassic in age based on faunal finds.

Stratigrafiâ. Geologičeskaâ korrelâciâ. 2024;32(3):56-87
pages 56-87 views

Volgian and Ryazanian Stages in the Novoyakimovskaya-1 Well (Western Yenisei-Khatanga Regional Trough, Siberia). Article 1. General Characteristics of the Yanov Stan Formation and Its Molluscan Biostratigraphy

Rogov M., Zakharov V., Solovyov A., Melnikov P., Pustylnikova V., Fedorova A., Meshcheryakova E., Savelieva Y., Ippolitov A., Olenova K., Evseeva Y.

Аннотация

We represent data on lithology, biostratigraphy, and molluscan paleontological characteristics of the Lower Volgian–Upper Ryazanian interval of the Yanov Stan Formation obtained from the core of the Novoyakimovskaya-1 parametric borehole. The formation is represented by the intercalation of mudstones and siltstones with rare sandstone beds and numerous levels with carbonate nodules. For the first time, numerous glendonites are reported from the Yanov Stan Formation, including those from stratigraphic intervals from which they have not been previously known. A total thickness of the Janov Stan Formation is 290 m with almost no missing intervals of the core, and ammonites and bivalves are common throughout the section. This enabled us to work out a detailed biostratigraphic subdivision of the section based on ammonites and bivalves. The following succession of ammonite zones known in Western Siberia and, mainly, in Eastern Siberia (from bottom to top) was established: Paravirgatites lideri, Pavlovia iatriensis, Dorsoplanites ilovaiskii, D. maximus, Epivirgatites variabilis, Praechetates exoticus, Craspedites okensis, Praetollia maynci, Hectoroceras kochi, and Surites subanalogus. The bivalve succession, based on the members of the genus Buchia, includes the following zones: Buchia mosquensis, B. unschensis, B. okensis,? B. jasikovi, and B. volgensis. The molluscan assemblages of the studied interval, starting at least from the latest Middle Volgian, are similar to the assemblages of the eastern part of the Yenisei-Khatanga depression and the Laptev Sea coast but differ from the coeval complexes of Western Siberia. This suggests the existence of some environmental factors that prevented the free dispersal of mollusks from the western part of the Yenisei-Khatanga depression into the West Siberian basin.

Stratigrafiâ. Geologičeskaâ korrelâciâ. 2024;32(3):88-111
pages 88-111 views

Cretaceous Angiosperms: Evolutionary, Geographical and Palaeoclimatic Aspects (On the S. V. Meyen’s Scientific Legacy)

Herman A.

Аннотация

The additional arguments regarding Cretaceous evolution of angiosperms are provided which further develop the evolutionary ideas of S.V. Meyen. The quantity, diversity and geographical distribution of angiosperms, which first appeared at the beginning of the Cretaceous (in Berriasian), had been increasing significantly starting from the end of the Albian. This could be due to the fact that for the first time in the Cretaceous history of the Earth, a hot and humid equatorial belt appeared in the Albian and acted as a “generator of suprageneric taxa” of higher plants. The speed of the angiosperm macroevolution had increased dramatically due to the development of this belt, while the fluctuations in the Late Cretaceous climate “launched the equatorial pump at full capacity.” The anatomy of the Triassic bennettitalean microsporangium Leguminanthus indicates that this group of gymnosperms possessed a morphological structure, which could have led to the formation of a closed (with closed margins) seed organ similar to the carpel of angiosperms, probably by means of a large evolutionarily significant saltation – gamoheterotopic transformation of female bennettite fruitifications to the anatomy of male ones. The presence of wide and probably flattened petioles and rachis in the Triassic bennettitalean Pterophyllum leaves confirms indirectly the validity of the assumption that angiosperm leaves could have evolved from those of bennettitaleans by means of phyllodization (flattening and enlargement of the leaf petiole).

Stratigrafiâ. Geologičeskaâ korrelâciâ. 2024;32(3):112-126
pages 112-126 views

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