Vol 64, No 5 (2019)


Isotopic and geochemical study of marine sediments organic matter from delta of Indigirka river to the ice shelf border of the East-Siberian sea

Sevastyanov V.S., Fedulov V.S., Fedulova V.Y., Kuznetsova O.V., Dushenko N.V., Naimushin S.G., Stennikov A.V., Krivenko A.P.


Various hydrocarbon gases (СН4, С2Н4, С2Н6, С3Н6, С3Н8, С4Н8, н-С4Н10) and CO2 have been obtained with very low concentration from different layers of marine sediments with thickness up to 2 m on the continental shelf of the East Siberian Sea in the section from the mouth of Indigirka river to the ice shelf border. A freshwater complex, carried by Indigirka river and other rivers, has the dominant influence on composition of organic matter (OM) in almost entire studied area of the East Siberian Sea. It was shown that concentration of the most common gases CH4 and CO2 increases with increasing depth of sediment sampling for the core of sediments selected at station 5602-2, and the carbon isotope composition of CO2 decreases, reaching a value of -24‰. A sulfate reduction area was found at sediment depth of 48–70 cm. For the first time it was shown that a regular change in isotopic fractional characteristics (IFC) occurs as a result of diagenesis of OM. IFC was obtained for low maturation OM, OM for sulfate reduction area, and for high maturation OM. For low horizons of the sediment (below 77 cm from the surface), the OM is significantly matured along the path of geochemical evolution compared with the immature sediments of the upper horizons.

Геохимия. 2019;64(5):451-459
pages 451-459 views

High-pressure elastic properties of polycyclic aromatic hydrocarbons obtained by first-principles calculations

Litasov K.D., Inerbaev T.M., Abuova F.U., Chanyshev A.D., Dauletbekova A.K., Akilbekov A.T.


Crystal structure and compressibility parameters of benzene and a number of polycyclic aromatic hydrocarbons (PAHs) were calculated by first-principles methods of the density functional theory with a gradient approximation of the exchange-correlation potential in the form of PBE, taking into account the van der Waals interactions optPBE-vdW in a pressure interval of 0–20 GPa. A comparison with the experimental data for benzene, naphthalene, tetracene, and pentacene shows a high accuracy of the calculations. All studied materials have a close compressibility with the bulk modulus from 8 to 12 GPa and its pressure derivative 6.9–7.5, which consistent with a decrease in the intermolecular distances and a weak deformation of the molecules and benzene rings themselves. There is a weak dependence of the compressibility on the number of atoms (benzene rings) in the molecule or on the type of crystal structure (most PAHs have a space group 21/a). Compounds with a large number of benzene rings, as well as a denser ring structure – cyclic (pyrene, coronene) have lower compressibility with respect to less dense PAHs (tetracene, hexacene). Some PAHs, benzene, phenanthrene, pyrene and coronene, have high-pressure modifications, but a correct description of their structures, which allows to obtain elastic modules, has not yet been made. The obtained data on PAH compressibility can be used in the development of high-temperature equations of state and calculation of the equilibrium composition of the liquid and solid components of the C-O-H system.

Геохимия. 2019;64(5):460-470
pages 460-470 views

Estimation of the content and composition of trapped melt in dunite

Bazylev B.A., Ledneva G.V., Bychkova Y.V., Kononkova N.N., Kuz’mina T.G., Romashova T.V.


A method was developed for the quantitative estimation of the content of trapped melt in various dunite types and the composition of this melt on the basis of the major- and trace-element characteristics of the dunites and compositions of their chrome spinels. Our approach is advantageous over the method based on clinopyroxene geochemistry and clinopyroxene–melt partition coefficients for the contents of the light REE and more incompatible elements in melt, comparable with it for the middle REE, and possibly less accurate for the heavy REE and Sr. The estimated mean contents of trapped melt in dunites from ophiolite and concentrically zoned complexes are 1.0–1.5 wt %, which is probably typical of various dunite types, including cumulate dunites from layered complexes. These values are an order of magnitude higher than previous estimates. The correspondence between the compositions of calculated trapped melts in dunites and real natural melts indicates that the estimated contents of trapped melt in dunites are realistic, and the mineral–melt partition coefficients that were used in our calculations are valid for the complexes considered in this paper. In general, the proposed method is suitable for serpentinized dunites, including dunitic serpentinites.

Геохимия. 2019;64(5):471-485
pages 471-485 views

Sapphirine-bearing granulites of the anabar shield

Nozhkin A.D., Likhanov I.I., Savko K.A., Krylov А.А., Serov P.A.


The results of a detailed study of the mineral and chemical composition, geothermobarometry, and U-Pb isotope dating of zircon of high-aluminous sapphirine-bearing crystals of shales associated with biotite-garnet-sillimanite gneisses, hypersthene-two feldspar and high-potassium hypersthene orthogneisses, Ti-rich and subalkaline metabasites belonging to the Kilegirian Formation of the Daldyn series of the Anabar shield. Unlike the known granulites of the Daldin and Upper Ananbar series, the rocks of this association are enriched in K, Rb, Ba, Th, light REEs, differing in elevated (La/Yb)n. The results of thermobarometry yielded the P–Tparameters of formation and evolution of sapphirine-bearing granulites in the Anabar shield with peak values of UHT metamorphism in the range of T= 920–1000°C at P= 9–11 kbar. Isotope-geochronological data indicate a polymetamorphic evolution of these rocks. Detrital zircon cores in the center of crystals yielded ages of 3.36, 2.75, 2.6, and 2.5 Ga. Later, superimposed metamorphic transformations of the detrital zircon formed rims dated to 2.4, 2.3, 2.2, and 1.8 Ga. The timing of formation of aluminous metasedimentary and associated metamagmatic rocks can be estimated in the interval from 2.5 to 2.4 billion years. A potential provenance source of the detrital zircons could be hypersthene plagiogneisses and metabasites of the Daldyn series with a premetamorphic age no less than 3.3 Ga, and products of their metamorphism of about 2.7 Ga old, and possibly not yet detected in the region Na-K granites with an age of about 2.6–2.5 billion years, known on other shields and enriched with radioactive (K, Th, U) and rare elements. An additional source of clastic material in the formation of aluminous sediments could be the associated two feldspar magmatic rocks of rhyolite composition, having the same model age with them.

Геохимия. 2019;64(5):486-502
pages 486-502 views

Geochemical features, sources and geodynamic settings of accumulation of the cambrian sedimentary rocks of the Mel’gin trough (Bureya continental massif)

Ovchinnikov R.O., Sorokin A.A., Kovach V.P., Kotov A.B.


The first data about geochemical features of the Cambrian sedimentary rocks of the Mel’gin trough of the Bureya continental Massif, as well as ages of detrital zircons of them are obtained. It is established, that among the detrital zircons from the sandstones of the Chergilen and Allin formations of the Mel’gin trough zircons with Late Riphean (peaks on relative probability plots – 0.78, 0.82, 0.94, 1.04 Ga) and Early Riphean (peaks on relative probability plots – 1.38, 1.45, 1.64 Ga) ages predominate. The single grains have a Middle Riphean, Early Proterozoic and Late Archean ages. We can suppose, that the sources of Late Riphean detrital zircons from sandstones of the Chergilen and Allin formations are igneous rocks of gabbro-granitoids (940–933 Ma) and granite- leucogranites (804–789 Ma) association, identified in the Bureya continental Massif. We can`t assume, what kind of rocks were the source for Middle Riphean and older detrital zircons from the Cambrian sedimentary rocks of the Bureya continental Massif, because in this massif still do not identified complexes older Late Riphean age. The most probable geodynamic conditions of accumulation of the Cambrian deposits of the Mel’gin trough is the conditions of active continental margin, which is corresponding to of Early Cambrian granitoids magmatism.

Геохимия. 2019;64(5):503-519
pages 503-519 views

Thermochemical study of sodium and sodium-calcium amphibols

Ogorodova L.P., Kiseleva I.A., Vigasina M.F., Gritsenko Y.D., Bryzgalov I.A., Melchakova L.V.


A thermochemical study of six natural sodium and sodium-calcium amphiboles was carried out using the high-temperature melt solution calorimetry on a Tian-Calvet microcalorimeter. The enthalpies of formation from the elements have been obtained for arfvedsonites: K0.5(Na1.5Ca0.5)(Mg4.0Fe0.93+Al0.1)[Si8.0O22](OH)2 (Inaglinsky Massif, Central Aldan, Russia) (-11626.6 ± 8.9 kJ/mol), (Na0.5K0.1)(Na1.6Ca0.4)(Mg3.6Fe0.42+Fe0.83+Al0.2)[Si8.0O22](OH)2 (Khibiny Massif, Kola Peninsula, Russia) (-11520.8 ± 14.6 kJ/mol) and (Na0.7K0.3)Na2.0(Fe4.02+Fe0.63+Mn0.1Ti0.1Al0.2)[Si8.0O22](OH)2 (Katuginskoe deposit, Transbaikalia, Russia) (-11384.7 ± 17.1 kJ/mol); for riebeckites: Na2.0(Mg2.5Fe0.52+Fe1.53+Al0.5)Si8O22(OH)(Kumula deposit, Central Kazakhstan) (-10791.0 ± 10.1 kJ/mol) and Na2.0(Mg0.9Fe2.12+Fe1.93+Al0.1)[Si8O22](OH)(Krivoy Rog, Ukraine) (-10260.8 ± 10.9 kJ/mol) and richterite (Na0.7K0.3)(Ca1.2Na0.8)(Mg4.6Fe0.42+)[Si7.8Al0.2O22](OH)2 (Kovdorsky Massif, Kola Peninsula, Russia) (-12154.2 ± 9.7 kJ/mol). The values of the standard entropies, enthalpies, and Gibbs energies of formation are estimated for the end members of isomorphic series: arfvedsonite – magnesioarfvedsonite, riebeckite – magnesioriebeckite and richterite – ferrochichthite.

Геохимия. 2019;64(5):520-528
pages 520-528 views

Stable carbon and nitrogen isotopes in woody plants and herbs near the large copper smelting plant

Veselkin D.V., Chashchina O.E., Kuyantseva N.B., Mumber A.G.


Variations of stable carbon (13С and 12С) and nitrogen (15N and 14N) isotopic composition are analyzed in forest plants subjected to the emissions of large copper smelting plant. The studies were carried out in pine forests at ten test plots near the Karabash copper smelting plant and in the Ilmen State Reserve at South Urals. The 13С/12С and 15N/14N isotopic ratios were analyzed in leaves of plants of different functional groups (with ecto-, ericoid, or arbuscular mycorrhiza; with nitrogen-fixing symbiosis, and non-mycorrhizal). The 13С/12С ratio did not change under technogenic pollution. The low isotopic 15N/14N ratio was established in ectomycorrhizal trees, while the high ratio was found in herbs with arbuscular mycorrhiza, nitrogenfixing symbiosis, and non-mycorrhizal groups. As compared to nonpolluted habitats, the 15N content in leaves near the copper smelting plant increases by 2.7‰ in the ectomycorrhizal trees and by 3.4‰ in undershrubs with ericoid mycorrhiza, and by 2.2‰ in herbs with arbuscular mycorrhiza. This indicates a significant change in conditions of mineral feeding of plants under heavy metal pollution of natural ecosystems.

Геохимия. 2019;64(5):529-537
pages 529-537 views

Acidic drainage on Pavlovskoe ore deposit (archipelago Novaya Zemlya)

Limantseva O.A., Ryzhenko B.N., Cherkasova E.V.


Thermodynamic modelling of the system of “Pavlovskoe rocks-water-atmoshere gases” is done. The modelling aqeous solutions are alkaline. The concentrations of normalized elements (As, Cd, Se, Co, Cr, Cu, Ni, Pb, Ga, Ge, Sr, In) are much higher their mcl standards, especially on the ore storehous sites.

Геохимия. 2019;64(5):538-547
pages 538-547 views

Short communications

Age and duration of the formation of the Olimpiadinski gold deposit (Yenisei ridge, Russia)

Gibshner N.A., Sazonov A.M., Travin A.V., Tomilenko A.A., Ponomarchuk A.V., Silyanov S.A., Nekrasova N.A., Shaparenko E.O., Ryabukha M.A., Khomenko M.O.


40Ar/39Ar datings of quartz-mica-sulfide, quartz-gold-arsenopyrite-pyrrhotite and quartz-gold-antimony associations at the ultra-large (more than 1000t. Au) Olimpiadinski gold deposit (Yenisei ridge) have been correlated. It was found that hydrothermal activity at the deposit lasted at least 150 ma.y. from 817 to 660 ma.y.

Геохимия. 2019;64(5):548-553
pages 548-553 views

Germanium-rich palladium minerals – palladogermanide pd2ge, paolovite pd2 (sn, ge), zvyagintsevite in sulfide-bearing anorthosites of the Yoko-Dovyren pluton, Baikal region

Spiridonov E.M., Orsoev D.A., Ariskin A.A., Kislov E.V., Korotaeva N.N., Nikolaev G.S., Yapaskurt V.O.


The bottom part of the Yoko-Dovyren layered mafic–ultramafic intrusion hosts the Baikalskoe deposit of Cu–Ni sulfide ores with Pt–Pd mineralization, and the stratigraphically higher portion of the intrusion includes units and pockets with low-sulfide ore with Pt–Pd mineralization. The maximum Pd, Pt, Au, Ag, Hg, and Cd concentrations and the greatest number of noble-metal minerals, including those containing Ge, are typical of vein-shaped sulfide-bearing anorthosite bodies and pegmatoid anorthosites in the upper part of the Critical Unit, at the boundary between the troctolite unit and overlying gabbronorite. The noble-metal minerals were produced mostly by postmagmatic pneumatolytic (fluid–metasomatic) processes. These minerals are kotulskite, moncheite, zvyagintsevite, telargpalite, paolovite, and other Pd and Pt chalcogenides and intermetallic compounds, including palladogermanide that contains 19.8 wt % Ge (the first find in Russia), paolovite with 8.1 wt % Ge (first find), and Au-rich zvyagintsevite that bears 0.55 wt % Ge. The palladogermanide has the composition Pd2.03(Ge0.80As0.15Bi0.02)0.97, and much of its Ge is substituted for As, as is typical of endogenic Ge minerals. The composition of the Ge-paolovite is
Pd2.02(Sn0.54Ge0.35Sb0.05As0.04)0.98. The possible source of the germanium is contact-metasomatic pyrite-bearing paralic carbonaceous shales hosting the intrusion.

Геохимия. 2019;64(5):554-558
pages 554-558 views


Hydrogeology in Russia: fundamental and applied research (XXII conference on groundwater of Siberia and Russian Far East with international participation)

Novikov D.A., Ryzhenko B.N., Alekseev S.V., Sukhorukova A.F., Eltsov I.N., Kurchikov A.R., Alekseeva L.P.


Hydrogeological studies in Russia are conducted in many areas, ranging from the assessment of the groundwater resource base to the study of water-rock-gas-organic matter system geological evolution. This breadth of research was shown by the All-Russian Conference on Groundwaters of Eastern Russia (XXII Conference on groundwater of Siberia and Russian Far East with international participation) held on June 18-22, 2018 in Novosibirsk at the Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch of Russian Academy of Sciences (IPGG SB RAS). The meeting was attended by 138 scientists from 79 scientific, educational and industrial organizations.

Геохимия. 2019;64(5):559-564
pages 559-564 views

This website uses cookies

You consent to our cookies if you continue to use our website.

About Cookies