Litologiâ i poleznye iskopaemye

Lithology and Mineral Resources is an international peer reviewed journal that publishes articles on a wide range of problems related to the formation of sedimentary rocks and ores. Special attention is given to comparison of ancient sedimentary rocks and ore formation with present-day processes.

The major part of the journal is devoted to comparative analysis of sedimentary processes on the continents and in oceans, as well as genetic aspects of the formation of sedimentary and hydrothermal-sedimentary mineral resources.

The journal welcomes manuscripts from all countries in the English or Russian language.

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No 3 (2023)

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Structural and Сrystal-Сhemical Features of Mixed-Layer Illite-Containing Minerals from Diagenetically Altered Upper Jurassic Oil Source Rocks
Drits V.A., Sakharov B.A., Zviagina B.B.

Illite-smectite (I-S) minerals from the Upper Jurassic oil-bearing rock shales of Denmark and the North Sea were studied by a complex of diffraction and spectroscopic methods. Detailed structures were identified to reveal the mechanism of diagenetic transformation of these shales. Usually, in oil-bearing rocks of sedimentary basins, oil generation occurs simultaneously with the I-S diagenetic transformation. The results obtained demonstrate the relationship between these two reactions: NH3 molecules released from kerogen during ma-ximum oil formation are fixed as NH4 ammonium cations in smectite or vermiculite interlayers, forming mica or tobelite structural fragments. As a result of this solid-phase transformation, mixed-layer structures are formed, consisting of layers of illite, tobelite, smectite and vermiculite (I-T-S-V).

Litologiâ i poleznye iskopaemye. 2023;(3):215-229
pages 215-229 views
Composition and Genesis of Carbonate Constructions in the Region of Paramushir Hydroacoustic Anomalies (Sea of Okhotsk)
Petrova V.V., Rashidov V.A., Gorkovа N.V.

Carbonate nodules from the area of the Paramushir hydroacoustic anomalies are territorially confined to the zones of methane seeps, controlled, in turn, by deep tectonically weakened bottom areas. According to the structure, chemical and mineral composition, the screeds can be classified as volcanogenic-sedimentary rock, consisting of vitro-, litho-, crystalline clasts and buried microfauna, cemented with carbonate (aragonite) cement. The details and sequence of mineral formation of carbonate nodules are considered.

Litologiâ i poleznye iskopaemye. 2023;(3):230-248
pages 230-248 views
Chemical Weathering Indices and their Use for Paleoclimatic Reconstructions (on the Example of the Vendian‒Lower Cambrian Section of Podolsk Transnistria)
Maslov A.V., Podkovyrov V.N.

The article provides an overview of various indices/indicators (Vogt, Parker, CIA, CIW, PIA, MIA, etc.) used in the study of weathering profiles/crusts and reconstruction of paleoclimatic environments of sedimentary sequence accumulation. Their possibilities are demonstrated by the example of Vendian-Lower Cambrian terrigenous deposits of Podolsk Transnistria (southwestern slope of the Ukrainian Shield). The distribution of the ba1 index values in this section indicates the presence of the material most transformed by the processes of chemical weathering in the mudstones of the Nagoryany Formation, the lower part of the Danylivka and the middle part of the Studenytsya formations. For mudstones of the Danylivka–Zbruch interval, the HM values are close to the HMPAAS. For rocks of the Yaryshiv–Nagoryany interval, the HM values are slightly higher, and for mudstones in the lower part of the Yaryshiv Formation, they are comparable to those inherent in continental clays of a hot tropical climate. The average SA index for mudstones of the entire section is 5.6 ± ± 0.7. Mudstones of the Hrushka–Nagoryany interval, where SA < SAPAAS, are composed of more weathered material. The WIP values in the mudstones of the Mohyliv and Yaryshiv formations, as well as in the upper part of the Zbruch Formation, correspond to the interval of their values between PAAS and the average Archean granite. Clay rocks of other formations have WIP ≤ WIPPAAS values. The average CIA value for mudstones is 71 ± 4, which practically corresponds to the CIA value (70), which separates the sediments of cold/arid and warm/humid climates. Variations in the CIW index along the section are symbate with variations in the CIA. The vast majority of mudstones are characterized by PIA > PIAPAAS values. The average CPA value is 91 ± 4, which is also typical for PAAS. The above and other data show that on the basis of a “direct” interpretation of the values of various indices of chemical weathering inherent in fine-grained clastic rocks, the paleoclimate that existed in the Vendian‒Early Cambrian on the territory of Podolsk Transnistria was rather moderate or warm humid. Comparison of the CIA values of mudstones with the values of this indicator for the particulate suspended matter of modern rivers suggests that the climate in the Vendian‒Early Cambrian resembled dry and humid subtropical or dry tropical with elements of humid.

Litologiâ i poleznye iskopaemye. 2023;(3):249-273
pages 249-273 views
Early Ediacaran Positive C-Isotope Anomaly in Limestones of the Chernaya Rechka Formation of the Igarka Uplift (Northwestern Siberian Platform)
Kochnev B.B., Pokrovsky B.G., Kuznetsov A.B., Marusin V.V., Kaurova O.K., Bykova N.V., Ivanova N.A.

The Precambrian Chernaya Rechka Formation (Igarka Uplift) hosts a high-amplitude positive carbonate carbon isotope anomaly (up to 12.4‰) spanning through 500 m of the section and occurring simultaneously with a rise of δ13Сorg values. The similar trends of carbon isotope variations in the carbonate fraction and organic matter are not caused by local sedimentary environments since the studied anomaly-bearing carbonates accumulated in different zones of the carbonate ramp and shallow shelf. Oxygen isotope composition of these carbonates and some other geochemical criteria indicate minimal (if any) impact of post-sedimentary processes on preservation of the isotope systems. Concentrations of trace elements in the carbonate fraction indicate alternating anoxic and oxic environments that did not affected the carbon isotope composition during accumulation of the Chernaya Rechka Formation. The profound positive δ13С anomaly was putatively caused by a global deficiency of 12С in the paleo-ocean related to accumulation of methane hydrates and burial of non-oxidized organic matter. Together with geochronological and stratigraphic data, minimal 87Sr/86Sr values (0.7074) in the Chernaya Rechka Formation reveal the lower Ediacaran (lower Vendian) age of the unit (635–580 Ma). Among the closest stratigraphic analogues of the Chernaya Rechka Formation are the Dal’nyaya Taiga Group (Patom Basin) and coeval stratigraphic sequences in the southern Siberian Platform. Global nature of the positive δ13С anomaly provide its correlation with other coeval C-isotope events worldwide.

Litologiâ i poleznye iskopaemye. 2023;(3):274-298
pages 274-298 views
New Data on the Age of Ozernoe Polymetallic Deposit (Western Transbaikal)
Minina O.R., Gordienko I.V., Damdinov B.B., Tashlykov V.S., Goneger T.A., Skripnikov M.S., Lantseva V.S., Khubanov V.B., Kislov E.V.

The article presents the results of biostratigraphic and U-Pb geochronological (detrital zircons) studies of the volcanic-terrigenous lacustrine member of the upper subformation of the Lower Paleozoic Oldyndinskaya Formation, which contains pyrite-polymetallic ores of the Ozernoye deposit (Kurbino-Eravninsky ore region, Western Transbaikalia). The first, second and “crystal tuff” productive horizons of the first ore-bearing level of the ozernaya member were studied. It is represented by an alternation of tuffs, calcareous, siliceous, carbonaceous tuffites, pelitomorphic limestones, limestone gravelstones with interlayers and lenses of mine-ralized tuff-conglobreccia and layers of banded siderite pyrite ores. For the first time, bryozoans, algae, and palynoflora were found in calcareous tuffaceous siltstones and limestones of the second and “crystalline tuff” productive horizons. These data indicate the Early Carboniferous, Tournaisian time of sediment accumulation. The results of U-Pb geochronological studies of detrital zircons from the mineralized tuff-conglobreccia of the third productive horizon limit the lower limit of the rock formation time as not older than the Late Cambrian.

Litologiâ i poleznye iskopaemye. 2023;(3):299-314
pages 299-314 views
Правила для авторов
Litologiâ i poleznye iskopaemye. 2023;(3):315-316
pages 315-316 views

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