Abstract— One of the pivoting problems in the genesis of magmatic deposits is the role of silicate melt in the origin of sulfide ores. A way of solving this problem is to compare massifs with different mineralization, using contents of major and trace elements in the rocks. However, intrusions of the Norilsk intrusive complex are rarely compared with one another in terms of ore composition and volume

Eutrophic lowland swamp was investigated in the southern taiga within the Ostashkovskaya terminal moraine ridges of the Valdai Upland in the Novgorod Region. Obtained characteristics of the landscape–geochemical barrier of the swamp must be taken into account both in the search for minerals and in planning of rational nature management. The chemical composition of peats and drainage water is determined

Abstract— Mineralogical–geochemical properties of snow were studied in the activity areas of the mining and ore-processing companies Severonikel in Monchegorsk, Karelsky Okatysh in Kostomuksha, and Sibay Mining and Processing Company in Sibay. The mineralogical and chemical compositions of the aerosols corresponds to the metallogeny of the study areas and the ore specialization of enterprises. The

Abstract— A radical transformation of the liquidus structure of the MgO–FeO–CaO–SiO2 system of thermochemical superplumes formed in the Mg–Fe postperovskite-bearing layer D” at the boundary with the Earth’s core during its ascent in the host material of the Mg–Fe bridgmanite-bearing lower mantle to the Mg–Fe ringwoodite-bearing transition zone crossing the 670-km seismic boundary was studied experimentally

Abstract— The paper deals with the vulnerability of surface waters in the Arctic to regional and global base-metal pollution fluxes, a problem whose solution requires specialized approaches to water quality assessment. The metals are shown to be contained in low-salinity waters of the northern territories mostly in ionic forms, which predetermines the high bioavailability of these metals for aquatic

Abstract In Gulu area, geothermal waters show a high concentration of alkali metals (Li, Rb and Cs) and some other typical pollution elements, e.g. As, Sb and Tl. They are also enriched in the geothermal deposits during the phase separation of silica sinter and residual geothermal water. A comprehensive sequential extraction was carried out on the Gulu silica sinter. The results indicated that significant

The article presents the first U-Pb (SHRIMP–II) zircon age data on dikes cutting dunite of the Kamenushinsky dunite–clinopyroxenite–gabbroic massif in the Ural Platinum Belt. The dikes are made up of gabbro-pegmatite, hornblendite, and granite, the field relations between which suggest their subsequent intrusion in the dunites. Their geochemical features show that they belong to two different magmatic

Abstract— The paper presents original authors’ data on the geochemical aspects and peat deposits and conditions of their accumulation at the three oligotrophic bogs in the south taiga subzone of West Siberia. These data were acquired with regard to a complex of factors impacting the development of peat deposits: the geomorphological setting in the landscape, the lithochemical composition of the underlying

The lithological-facies zoning of the Neo- and Eopleistocene sediments of submarine continental margin of Southwestern Africa was described for the first time using deep-sea drilling data. Corresponding maps with isopachs were processed using A.B. Ronov’s volumetric method to calculate the quantitative parameters of sedimentation for the distinguished types of Pleistocene sediments. The accumulation

Abstract The purpose of the work is to analyze long-term radiocesium wash-off from the catchments contaminated due to the Chernobyl accident in 1986 and Fukushima Dai-ichi NPP (FDNPP) accident in 2011. A semiempirical diffusional model for radionuclide wash-off is proposed enabling estimation of 137Cs dissolved and particulate wash-off coefficients for Chernobyl and Fukushima contaminated catchments

Transfer functions for reconstruction of the duration of ice-free period at stations in the Chukchi, East Siberian and Laptev seas have been developed by comparison of hydrometeorological data and the chemical composition of bottom sediments accumulated during observation period. It has been established that in addition to the previously discussed processes through which the ice cover affects the chemical

Abstract— The carbon isotope composition of oil in the various regions of Tatarstan was found out to range from δ13C = –32.5 to –28.6‰. Oil in sedimentary rocks in the central part of the South Tatar Arch (STA) is characterized by a lighter carbon isotope composition (δ13C < –29‰) than oil in the southeastern STA slope (δ13C > –29‰), whose rocks are broken by deep faults. The oil of relatively heavy

Clays from the Bulganak volcanic field (Kerch Peninsula) were studied to estimate the possible sources of chemical elements in mud volcanoes. The collected clay samples were analyzed using inductively-coupled argon plasma mass spectrometry on an ELAN 9000 mass spectrometer (PerkinElmer-Sciex, USA-Canada). According to the obtained data, the geochemical specialization of the eruption products was determined

In this work, mineralogical and geochemical data are presented for sulfide-rich phoscorites and carbonatites in the Kovdor massif. The PGE and Ag-bearing mineralization of bornite–chalcopyrite and Ag‑bearing mineralization of pyrrhotite–chalcopyrite associations were investigated. In carbonatite stage formation of massif, the noble metal minerals occurred during evolution of alkaline–ultrabasic melt

The Uralian foredeep is a classical marginal structure located on the foreland of the Late Paleozoic Uralian Orogen. It is subdivided into several depressions/sedimentation basins. This paper presents the analysis of the REE and Th distribution in the Middle Carboniferous and Lower Permian clay rocks of the Yuryuzan–Sylva Depression. This structure, like other depressions of the foredeep, is made up

Abstract— A mechanism is suggested to explain the transport of sulfide material by means of its dissolution and subsequent redeposition under the effect of an ascending infiltrating flow of intercumulus melt during the compaction of cumulates in layered plutons. Evidences of this process are observable in the Burakovo–Aganozero intrusion. Analysis of data on Cu concentrations in rocks of the pluton

The ecological situation on Shkot Island and the adjacent part of Russky Island in terms of mercury content in soils and leaves of tree and shrubbery vegetation has been analyzed. The main sources of mercury input into geosystems have been revealed. To determine its content in soils and vegetation, 3 and 16 plots have been sampled on Russky and Shkot islands, respectively. It is shown that the soil

In the Angara part of the Yenisei Ridge, a sequential section of the metapicritic–basalt sequence and overlying carbonate rocks of the Gorevskaya Formation is established. This section is considered as a single volcanic–sedimentary complex formed at the Late Mesoproterozoic–Early Neoproterozoic boundary in the riftogenic marginal–continental paleobasin in the southwestern Siberian Craton. It is proposed

High concentrations of hydrocarbons were found in ground (400–4560 mg/kg) and bottom sediments (1180–17640 mg/kg) of the industrial zone of Khabarovsk. Intense microbiological transformation of organic pollutants was confirmed by the predominance of microbial components in alkanes, by the composition of volatile organic compounds (methanol, propanol, acetaldehyde, etc.), and by the total number of

Abstract— Oils in Tatarstan were determined to have been generated in at least two source rock formations, whose organic matter (OM) differed in genesis, redox conditions of sedimentation, and maturity. The oils of type 1 are hosted in Devonian terrigenous reservoir rocks, whereas the oils of type 2 occur in overlying reservoirs. Differences between the oils are reliably identified in most compositional

Abstract— The natural soil-forming process is currently significantly impacted by human activities. Intense agricultural production intensifies the weathering and transformation processes of soil clay minerals, which were inherited from rocks and contain much potassium available to plants. A positive balance of vermiculite is a reliable diagnostic criterion of soil depletion in potassium, and therefore

Abstract The Tethys Himalaya tectonic belt has long been a passive continental margin north of Gondwana, commonly known as the Tethys Himalaya, which Indo-Asian collision orogeny developed until the Cenozoic era. It is of great scientific significance to determine its geo-tectonic evolution over geological history. Therefore, to reveal the geodynamic background of the Late Cretaceous Tethys Himalaya

Abstract As an important source, sink and pool of carbon, lake sediment plays an important role in carbon cycle. Inorganic carbon (IC) in lake sediment is abundant, however the role of inorganic carbon in lake systems in terrestrial carbon cycling remains less clear. In this paper, the spatial variations, source and transformation of IC in sediments of Lake Hulun were investigated and compared with

Abstract The petrography, major, and trace elements concentration of the sandstones from the Zhanjin Formation in Qiwu area, south Qiangtang Basin, have been studied to determine their provenance, intensity of paleo-weathering and depositional tectonic setting. Petrography indicates that the composition and texture maturity of the sandstones are moderate. The detrital composition of Zhanjin Formation

Abstract The Paleoproterozoic Jiao-Liao-Ji Orogenic Belt is a part of the Eastern Block, North China Craton. The Shuangcha rock mass has been recently recognized in Laohe group of Jiao-Liao-Ji Orogenic Belt, and it consists of mainly porphyritic monzonitic granite and porphyritic K-feldspar granite. We present detailed studies of petrography, geochronology and geochemistry of Shuangcha rock mass to

The lithological-facies zoning of the Neo- and Eopleistocene sediments of the Caribbean Sea has been described for the first time based on deep-sea drilling data. Сorresponding maps and isopach schemes were processed using A.B. Ronov’s volumetric method to calculate the quantitative parameters of sedimentation for the distinguished types of Pleistocene sediments. It was revealed that the role of carbonate

Abstract— Strong seasonal variations in the radon exhalation rate from the soil surface were revealed during a two-year monitoring cycle in a fault zone on a slope of Mount Beshtau in the Caucasus Mineral Water Resort area, Russia. The variations are characterized by very high radon levels in summer and low levels in winter. In the warm season (from late April to early October), the radon exhalation

A simple and reliable method for sulfate reduction using the Kiba reagent is adapted for the preparation of trace amounts of natural sulfates and sulfuric acid for isotopic (δ34S, δ33S and δ36S) sulfur analysis. It is shown that the method is successfully applicable for the preparation of samples of sulfates and sulfuric acid with a sulfur content of 0.1 mg for isotopic analysis of 34S, 33S, and 36S

Major and trace element distribution in the bottom sediments of Lake Maloe located on the Kuybyshev Isthmus, Iturup Island, was analyzed using the method of principal components. It was established that the geochemical characteristics of Lake Maloe sediments reflect a change from marine and lagoonal to fresh-water sedimentation environments. According to geochemical data, the erosion and weathering

Abstract— The paper presents results of the first geochronologic study (LA-ICP-MS zircon method) of metasedimentary rocks that host the banded iron formation (BIF) and the metarhyolites (halleflinta) of the Gimoly Group in the Kostimuksha greenstone belt,Karelian Craton. Felsic magmatism that produced the rhyolite sills and dikes was dated at 2759 ± 19–2743 ± 15 Ma. The clearly predominant group of

Abstract— The kinetics of reactions between minerals and water vapor or two water phases simultaneously (liquid + vapor) is still understood inadequately poorly, and the absence of these data disable realistic and comprehensive quantitative description of the evolution of hydrothermal system after its fluid heterogenizes. To bridge this gap, we have conducted quenching experiments with quartz crystals

Petrological and geochemical study of basalts and dolerites in East Antarctica, the formation of which is explained by the Karoo plume impact on the Queen Maud Land, revealed the presence of high-magnesium magmas, Fe-rich and depleted in incompatible elements, among the geochemically diverse magmas. Such high-Mg ferropicrites are scarce in other plume-related igneous provinces and their genesis is

Abstract The native gold in the Woxi Au–Sb–W deposit is characterized by remarkably high purities (99.9%), called as super-pure native gold. The deposit can thus be used as the suitable application example for analyzing ore-forming conditions by using the thermodynamic calculation of AuxAg1 – x-fluid equilibria. According to experimental results of minerals and fluid inclusions, some physicochemical

Abstract The paper presents data on noble-metal mineralization in carbon-bearing rocks of the Sarma Group in the southern flank of the Baikal inlier of the Siberian craton basement. The phase composition of the accessory ore minerals (pyrite, arsenopyrite, microinclusions of native Ni, Sn, Zn, Cu, Fe–Ni and Ni–Fe–Ti composite compounds, Cu and Pb sulfides, rutile, monazite, zircon, and barite) were

Abstract Surma Basin in Northeast India is characterized by a thick Cenozoic sedimentary succession that initiated due to the collision between Indian and Burmese plates. Variability in the litho-association of a thick sedimentary column in this robust terrain represents the distribution and deposition of enormous sediments that supplied throughout the entire basin evolution, especially during the

Abstract The paper summarizes data on germanium and gallium concentrations in natural magmatic melts as follows from analyses of mineral-hosted inclusions and quench glasses in volcanic rocks. Germanium concentrations in melts vary from 0.96 to 17.6 ppm (1472 determinations). The geometric mean germanium concentration in silicate melts is 1.56 ppm, which is quite close to the clarke value. Concentrations

Abstract Changes in the elemental composition of asphaltenes in organic matter (OM) of different origin, with particular focus on their evolution from proto- to mesocatagenesis, were analyzed in samples of Devonian bituminous shales and brown coals from the Kuznetsk Basin and samples of Cenozoic brown coals and clays from the Middle Amur Basin. The composition of asphaltenes (protoasphaltenes) of different

The paper reports petrochemical and isotope data on the ferromanganese ores and host volcanosedimentary rocks of the Taloi–Usoi interfluve of the Ikat terrane, the Central Asian Fold Belt. Obtained data indicate that the formation of the Taloi ferromanganese mineralization was related to the explosive and volcanic activity of synsedimentation suprasubduction volcanism. The age of the volcanogenic rocks

Abstract The paper presents author’s original and literature data on the standard free energy of 31 Sc ions and complexes in aqueous solution. Scandium behavior at the weathering of phyllite shales is physicochemically simulated with the Selector program package. The content of Sc in the shales is close to its average content in the Earth’s crust: 10–3 wt %. Solution in the weathering profile was determined

The natural basic aqueous aluminum and iron sulfate, aluminocopiapite (Al0.60\({\text{Fe}}_{{0.07}}^{{3 + }}\))\({\text{Fe}}_{{4.00}}^{{3 + }}\)[SO4]6.03(OH)1.95 ⋅ 19.54H2O (Blyava, South Urals, Russia), was studied using powder X‑ray diffraction, infrared and Mössbauer spectroscopy, and thermal analysis. The enthalpy of formation from the elements \({{\Delta }_{f}}H_{{el}}^{0}\)(298.15 K) = −11 826

Abstract The paper presents data on amphibolites dredged during Cruise 249 of the German R/V Sonne at three sites: one at the northwestern termination of the Stalemate Ridge (ocean-side slope of the Aleutian Trench) and two at the western slope of the north Shirshov Rise (in the western sector of the Bering Sea). Data on the petrography and geochemistry of the amphibolites and their estimated P–T metamorphic

The distribution of composition fields of syn-rift and syncollisional sandstones and fine-grained clastic/clayey rocks of various structures and different ages are compared on the SiO2–K2O/Na2O, F1–F2, and DF1–DF2 diagrams. Syn-rift sedimentary sequences fill intraplate rifts, rifts at divergent, conservative and convergent plate boundaries, as well as their triple junctions. Syncollisional sediments

Abstract The relationship between soil cave development and the chemical characteristics of groundwater in a karst area was investigated. The purpose of the investigation was to identify potential soil caves and predict their collapse. Field surveys and monitoring were carried out, and statistical analysis, and geological comparison methods were used to analyze the relationships between Ca++, HC\({\text{O}}_{3}^{

Abstract— Oxygen isotope composition was studied in 33 monomineralic fractions of olivine from plagioclase lherzolite, dunite, troctolite, and olivine gabbronorite of the Yoko-Dovyren layered massif. The δ18O values of the least altered rocks not contaminated with crustal materials range within 5.8 ± 0.2‰ (n = 27). These values for the dunite contaminated with carbonate material are notably higher

Abstract— The paper presents isotope–geochronological data on zircons from a granite–aplite dike that cuts garnet–hypersthene gneisses of the Kuzeyev unit of the Neoarchean–Paleoproterozoic Kan Group in the southern extension of the Ishimba–Tatarka regional shear zone, Kan River. The morphology and internal structure of most of the zircon grains indicate that the zircons are metamorphic and xenogenic

Abstract The variance and regression analyses were applied to study the distribution and relationships between organic carbon, calcium carbonate, abiogenic matter, biogenic silica, and their accumulation depth in the upper Pliocene sediments in different structural zones of the Indian Ocean. Analysis of variance allowed us to quantify the influence of diverse facies settings on the distribution of

We carried out equilibrium-kinetic modeling the interaction of the integrated technological sample from the Pavlovskoe ore deposit with atmospheric precipitates to estimate the potential environmental contamination during mining. Accumulation of major (Zn, Pb) and trace (Cu, Co, Cd, As, Hg, Se, Hg, Sb) ore elements in aqueous solution during summer period has been calculated. It has been shown that

Melt inclusions were investigated in the minerals of dacite tephra of the largest Holocene eruption (7900 years) of Khangar volcano, Sredinny Range of Kamchatka. Melt compositions correspond to rhyolite (SiO2 = 70–77 wt %, Na2O+K2O = 6–7 wt %) with ~5 wt % H2O. The melts show a minor negative Nb anomaly and lesser HREE depletion (La/Yb is ~7.1) compared to those of Ichinsky Volcano, another active

Abstract— The paper analyzes methods currently used to evaluate the generation parameters of source rocks and suggests a new modified variant of the van Krevelen diagram and an original algorithm for evaluating the hydrocarbon generation properties of bitumen-bearing rocks of the Bazhenov Formation and its analogues. This is done with the application of an integrated approach that employs pyrolitic

Abstract— The paper presents data on contents of the platinum group elements (Pt, Ir, Pd, and Ru) and Au in Fe–Mn nodules of different morphology and in their separate layers from the Cape Basin, Atlantic Ocean. The Layer-by-layer analysis of the Fe–Mn nodules and crusts shows that the platinum group elements (PGE) are accumulated in the ferromanganese oxyhydroxide layers relative to the clayey nuclei

Electron microscopic studies of the surface of the spacecraft descent vehicle (DV) have revealed faceted particles of various shape and size, which are formed when the DV travels through the Earth’s atmosphere at an ultrasonic velocity. The particles are no more than 5 µm in size. An X-ray diffraction analysis of the phase composition of the precipitate on the DVs porthole after their landing showed

The paper presents experimental and numerical simulation of the bioremediation in nitrate-, -sulfate-ions and uranium polluted aquifers near the Novosibirsk Chemical Concentrates Plant (NCPP) sludge storage facility. We used two HCh 4.4 (MSU) and PHREEQC 2.18 (USGS) software packages for geochemical modeling and found that the microbial consumption of oxidizers (oxygen and nitrate ions) led to a decrease

Abstract— Diamonds were lately identified in chromitites from ophiolites and in volcanic rocks. Although the tectonic settings of diamonds found in these rocks are different, the diamonds are identical in small size, cuboctahedral habit, sets of minor admixture elements, and isotopic characteristics. A model is suggested for their formation during various stages of a single evolutionary cycle of the

Abstract This paper reports the results of the first study of pyroxenes from the deepest zones of the Lovozero deposit. The geochemical and mineralogical study of these rocks is of great scientific interest, as they are the least differentiated rocks and provide insight into the composition of a parental magma. According to microprobe analysis, clinopyroxenes evolve from early diopside–hedenbergite–augite

Abstract— The GEOCHEQ_M and GEOCHEQ_Isotope databases and codes were used to simulate the evolution of chemical interactions with time in the closed systems aqueous solution 0.495 М NaCl + 0.0194 M NaHCO3 + olivine (Fo91) at temperatures of 200 and 320°C and a pressure of 350 bar. The solution to rock mass ratios, selected temperature and pressure, the chemical composition and size of the olivine grains

Abstract— The paper presents data on the comparative assessment of the composition and properties of natural and magnetized zeolite-bearing tuffs (ZBT) from the Kholinsky, Transbaikalia, and Chuguevsky, southern Russian Far East, deposits in Russia. In addition, the composition and properties of magnetite synthesized by two methods and used for ferritization of ZBT were determined. The phase composition

Three different-age series of granitoid veins and dikes of the Baikal–Muya fold belt were studied. Two of them, plagiogranites of the ophiolite complex and the first postophiolitic plagiogranites, are associated with the suprasubduction ophiolites of the eastern Baikal–Muya belt. The third series is represented by hypabyssal tonalite–plagiogranite–leucogranite complex of the Kichera zone in the western

Abstract— This paper discusses the petrological and geochemical characteristics of the acid plutonic rocks (mainly granites of different colors) exposed in Khanak and Devsar areas of Neoproterozoic Malani Igneous Suite (MIS) to understand their magmatic evolution processes, petrogenetic history and tectonic regimes. Petrographically, granites of both areas show porphyritic, hypidiomorphic, granophyric

The paper presents the results of thermodynamic modeling of a transformation of a kerogen-bearing sedimentary rock within the temperature range of 50–400°С at a gradually increasing pressure from 300 to 2200 bar. A gradual increase in temperature and pressure, starting from 50°С, leads to the formation of the lighter and more oxidized type of kerogen. The methane–carbon dioxide gas phase is present

The paper presents certain aspects of applying equilibrium-kinetic modeling to preliminarily assess the formation of the chemical composition of sewage subdump waters during upcoming mining at the Udokan deposit. The mineral dissolution rates, including oxidative dissolution of sulfides, and sorption of strontium, cobalt, zinc, and nickel on calcite are taken into account. It is shown that the chemical