Abstract— The paper presents data obtained on the production rates of cosmogenic radionuclides of different half-life in 42 chondrites that fell in 1959–2016. A quantitative approach is developed for using cosmogenic radionuclides as natural detectors of galactic cosmic rays (GCR) for different time periods and for different heliocentric distances. A long set of homogeneous data is compiled on 54Mn

Abstract—The influence of industrial emissions on the content of ash elements in the biogeochemical food chain “snow cover–soil–willow bushes–willow ptarmigan (Lagopus lagopus L.)” was investigated in the northern Norilsk plateau. A significant enrichment in metal pollutants (Ni, Cu, Co, Fe) and deficiency in Mn was found in the leaves of Salix lanata L. and the browse of the willow ptarmigan, indicating

Abstract—The lithological-facies zonality of the Neo- and Eopleistocene sediments from two main areas of the Cordilleran submarine margin is described for the first time. Processing of corresponding maps and isopach schemes using A.B. Ronov’s volumetric method made it possible to calculate the quantitative parameters of sedimentation for the distinguished types of Pleistocene sediments. Terrigenous

Abstract— One of the processes that can locally be involved in forming the composition of aromatic hydrocarbons in oils is the reaction of electrophilic methylation of aromatic cycles. Up to 40% of the original oil compounds can be transformed into methylation products. Methylation is demonstrated to most likely proceed during catagenesis, after the generation of the fluid that had produced a given

Abstract— Reproducing the geological evolution of the Yenisei Range is important not only to understand how mobile belts at boundaries between ancient cratons tectonically evolved but also to gain an insight into how the Siberian craton was incorporated into the Nuna and Rodinia supercontinents. The paper presents geological, geochemical, and isotope geochronologic evidence of Meso- to Neoproterozoic

Abstract—The contents of ions of basic salt composition (Na+, K+, Mg2+, Ca2+, \({\text{C}}{{{\text{l}}}^{ - }}{\text{,}}\)\({\text{SO}}_{{\text{4}}}^{{{\text{2}} - }}{\text{,}}\)\({\text{HCO}}_{{\text{3}}}^{ - }\)), dissolved nutrients (Si, P), and trace elements (Li, Rb, Cs, Sr, Ba, B, V, Ge, As, Mo, Mn, Fe, Co, Cu, Zn, Cd, Sb, Tl, Pb, Al, Ga, Ti, Zr, Hf, U, Y, REE) were determined for the first time

Abstract The study aims to fill the gap of knowledge in the literature concerning submarine hydrothermal activity on the eastern part of Hellenic Volcanic Arc. Hydrothermal fluids were collected by scuba diving in active shallow hydrothermal venting areas on Kos Island in the Aegean Sea in East Mediterranean. Analysis was carried out in suspended particles for Fe, Mn, Cu, Pb, Cd, Ca, Ba, Sr, Li, Al

Abstract The significant geochemical characteristics of the groundwater quality assessment including the impact of monsoon variation of chemical composition of groundwater were determined. 44 groundwater samples were collected in the Arani Taluk of South India and all important physico-chemical parameters including trace metals were determined to characterize and evaluate the hydrogeochemical nature

Abstract— The paper presents newly acquired data on the mineral and chemical composition of the crystal surface layers of arsenopyrite and pyrite from the Natalkinskoe gold deposit, northeastern Russia. Data on arsenopyrite and pyrite grains from metasomatites and from quartz veins and veinlets were obtained using a scanning electron microscope equipped with an energy dispersive X-ray spectrometer

Abstract— Experiments on REE, Y, Sc, and Li partition between aluminosilicate (L) and aluminofluoride (LF) melts in the granite system at 800°C and 1, 2 kbar, containing up to 18 wt % F and 2 to 13 wt % H2O, show that all REE, Y, Sc, and Li are preferably distributed into the aluminofluoride melt, regardless of the experimental conditions. The partition coefficients of the elements Kd REE = \(C_{{

Abstract— The paper presents recently acquired data on the chemical composition of mineral springs in the Pamirs (Firuza-MGU and Garm-Chashma) and the foothills of the Tien Shan (Tandykul, Obigarm, and Khodzhaobigarm) and discusses their geological settings. The first data are acquired on the trace-element composition of the waters of the springs. The calculated B/Cl, B/Br, and Li : Rb : Cs ratios

Abstract— The composition and content of hydrocarbons (HCs) in the waters three raised bogs of the south taiga subzone of Western Siberia: the Bolshoe bog, Central bog, and Bakchar bog (which is part of the Great Vasyugan mire) were determined by IR spectrometry, fluorimetry, and chromatography–mass spectrometry. The waters of the bogs are demonstrated to contain hydrocarbons coming from peat deposits

Abstract—Bottom sediment cores from the Langtibeito (Yamal Peninsula) and Gol’tsovoe (Gydan Peninsula) background arctic lakes are studied. The sedimentation rate estimated from 210Pb and 137Cs accounted for 0.17 and 0.20 cm/y, respectively. The element composition, grain-size composition, and loss on ignition were determined layer-by-layer in both cores. The element concentrations in the bottom sediments

Abstract—The lithological-facies zonality of the Neo- and Eopleistocene sediments from two main areas of the Andean submarine margin is described for the first time. Processing of corresponding maps and isopach schemes using A.B. Ronov’s volumetric method made it possible to calculate the quantitative parameters of sedimentation for distinguished types of Pleistocene sediments. Terrigenous sedimentation

Abstract In this paper, the capabilities of demotic unsupervised learning approaches were investigated to improve the procedure of geochemical anomaly identification. The separation of anomalous concentrations from the background is a crucial task in the mathematical analysis of geochemical data. The conventional methods rely on the statistical thresholds routinely; however, determining such boundary

Abstract— The Nadayansky Flow is one of the main markers of the volcanic pile of the Siberian Trap Province and covers an area of approximately 48 000 km2 at an average thickness of 30 to 50 m. The paper is the first to present data demonstrating the constancy of the major- and trace-element composition of the Nadayansky Flow, typifying basalt lava flows in the province. The flow makes up the bottom

Abstract— The paper systematizes methods used to determine trace concentrations (1n to 1000n ppb) of PGE and Au in geochemical materials. The methods involve various techniques of sample preparation for analysis and instrumental determination of elements. Each of the methods is briefly characterized, and the analytical possibilities of the application of the suggested approaches in solving various

Abstract Groundwater is only the primary source for drinking water in the northern Telangana, South India, where a number people suffers from fluorosis. With this concern a 34 groundwater samples were collected and studied to identify the occurrence, hydrochemical distribution of fluoride groundwater, using geo-statistical tool such as principal component analysis (PCA), saturation indices (SI), and

Abstract Chemical composition of melt-rocks from several localities around proposed post-Eocene Krk impact structure in Croatian carbonate (a.k.a. External) Dinarides was analyzed by three spectroscopic methods to decipher their source lithology. The utilized spectroscopic methods were ICP-AES, TXRF and PIXE+EBS, and their applicability for the analysis of melt-rocks was tested. The three analytical

Abstract— The mean concentrations of volatiles, major, and trace elements are estimated in the magmatic melts of Kamchatka based on an our database that includes analyses of melt inclusions and quenched glasses of rocks for 75 elements (the database comprised 1 900 000 analyses as of late 2018). The determined concentrations are compared with analogous characteristics of melts from island arcs and

Abstract In mainland China, there are large surface areas covered with shallow overburden (Regolith thickness < 100 m). Geological mapping is difficult here as there is not enough exposed bedrock. In this paper, we transfer geochemical and geophysical data to characteristics, and use it in geological mapping to identify the underlying bedrock. Above all, we define the “represent area of one geochemical

Abstract— The paper discusses the forms of anthropogenic radionuclides in natural waters at radiation-contaminated territories. The data were obtained using techniques of cascade filtration and flow field flow fractionation coupled with multi-detector analysis. The size and nature of the colloid and suspended particles in the tunnel waters were determined in the range of 1 to 10 000 nm. The average

Abstract—The composition of compounds employed as markers for anoxia in the photic layer of the sedimentation basin is studied in samples from Upper Devonian domanik-type sediments (Sargaevian, Semilukian, and Mendymian horizons, Famennian stage), which are widespread over the Volga–Urals basin. The studies were carried out along the north-south section spanning the northern and central parts of the

Abstract— The conditions of genesis of diamondiferous ultrabasic and basic rocks from xenoliths in kimberlite were studied by combining the data from analytical investigations of their mineral phases and experimental results of the study of melting relations in the diamond-forming mineral systems of the upper mantle. The compositions of minerals in some samples of metasomatized diamondiferous eclogite

Abstract— The paper presents analysis of the accumulation of toxic and vital chemical elements in discrete links of the food chain under conditions of a biogeochemical province in relation to the accumulation of phytochelatins and metallothioneins in the leaves of white birch (Betula pubescens). Gradients of metal concentrations are determined in the soils with increasing distance from the Unal tailing

Abstract—The base-metal (70–75 wt %) and tin–sulfide (10–15 wt %) deposits are the main indium suppliers in the world. However, the causes and conditions of In accumulation in the ores of these deposits are still unclear. To shed light on this problem, we simulated the physicochemical conditions of formation of base metal and tin–sulfide ores with elevated indium content. For this purpose, the average

Abstract—Data on the influx and behavior of humus substances in natural waters are considered. The widest spread methods of analyzing physicochemical properties of natural polymers causing their interaction with metal ions are analyzed. The concept of metal complexation with humus substances at different chemical equilibria is developed on the basis of original and an available literature review evaluating

Abstract The shock-explosive processing of rocks by micrometeorite and meteorite bombardment on the surface of the Moon and other airless bodies of the solar system is a dominant geological and geochemical process that produces the loose layer of regolith. The paper presents results of modeling the process of a micrometeorite impact using a millisecond laser. The targets in the experiment were a sample

Abstract—The kinetics of Np(VI and V) reduction was studied in model underground water in the presence of bacteria, isolated from from deep-injection disposal of liquid radioactive wastes of Siberian Chemical Plant. Obtained data indicate a chemical instability of Np(VI) in the studied system. The reduction of neptunium (V) depended on its initial concentration and the presence of microorganisms. In

Abstract The purpose of equivalence assessement is to recognize a significant shift between values of the same variables (elements in geochemical surveys) in two datasets. To merge two or more independent datasets that are somehow linked together to create a new integrated dataset, the significance of the difference between datasets must be determined. Merging data originated from two or more geochemical

Abstract This paper continues a series of our earlier publications summarizing literature data on the physicochemical parameters and chemical composition of fluids at endogenic gold deposits and presents estimated average values of the temperature, pressure, and salinity of fluids, and variations in these parameters, at Mesozoic gold deposits. Parameters of mineralizing fluids at the Mesozoic deposits

Abstract— A physicochemical study of natural hydrous magnesium orthophosphates bobierrite Mg3[PO4]2 · 8H2O and kovdorskite Mg2[PO4](OH) · 3H2O from the Kovdor carbonatite massif, Kola Peninsula, Russia, was carried out using X-ray diffraction, infrared spectroscopy, Raman spectroscopy, and thermal analysis. The enthalpies of dehydration of the minerals were measured using a NETZSCH DSC 204 F1 differential

Abstract— A procedure was proposed for the direct determination of changes in the composition of the adsorbed complex of freshwater terrigenous material upon its entry into a marine environment. It was shown that changes in the composition of the adsorbed complex calculated from the difference of major cation contents before and after contact with seawater closely match data obtained by the proposed

Abstract—Carbon isotope composition was analyzed in С21n‑alkylbenzene and n‑alklylnaphthalene from five Upper Devonian oils of the Timan–Pechora Basin. In spite of the variations in carbon isotope composition, the difference in δ13C between n‑alkylbenzene and n‑alklylnaphthalene is relatively constant and accounts for, on average, 2.7‰. It is generally accepted that these compounds were derived from

Abstract—Lithological-facies mapping of Pleistocene sediments of pelagic zone and ten key areas of the Pacific submarine margins allowed us to compile the review maps of the Neo- and Eopleistocene sediments for almost 90% of ocean basin area. The comparative analysis of quantitative sedimentation parameters for the Pleistocene sediments of the pelagic and continental margins revealed an increase of

Abstract— Combined ecological and geochemical assessment was performed for the major- and trace-element composition of groundwater of Bryansk oblast used for drinking water supply, and settlements and districts were ranked with respect to the contents of I, Se, and some other chemical elements and their concentrations were compared with the existing hygienic standards. It was shown that the I and Se

Abstract— Thermodynamic modeling was carried out for the formation of Mo–W ores at the Kalguty deposit (Gornyi Altai). The modeling was based on the physicochemical conditions of Mo–W ore formation estimated from fluid inclusion data. Quartz–wolframite veins of the deposit were formed under the influence of homogeneous reduced carbonate–chloride fluids, which showed elevated W and Sb concentrations

Abstract— The aim of this paper is to carry out a geochemical multivariate analysis on Qolqola gold deposit which is located in Kordestan province of Iran. The analysis and interpretation of geochemical data was carried out based on the results of 543 drilling core samples analyzed for Cu, Pb, W, Mo, Ag, As, Bi, Hg and Au. The purpose of this paper is to use probability plot modeling method for anomaly

Abstract— Differences between two types of highly differentiated granites of the Salmi batholith: namely Li-siderophyllite topaz-bearing and Li–F topaz-zinnwaldite granites, were determined based on the study of their structural-morphological, mineralogical and geochemical features are determined. The high degree of the differentiation of these granites is confirmed by the presence of primary topaz

Abstract— This paper reports the results of numerical estimation of the degree of organic matter maturity and hydrocarbon generation in the rocks of the Bremer 1–6 formations during the burial of the sedimentary basin of the Mawson Sea on the passive margin of East Antarctica. Numerical simulation of basins was conduced for 15 areas along two profiles, 5903 and 5909, in the eastern and western parts

Abstract— The effect of variations in the fo, fa, en, fs, di, an and ab components in high-Mg basaltic melts on the topology of the spinel liquidus was quantified by conducting simulations with the new SPINMELT-2.0 model for the spinel–melt equilibrium. It has been established that enrichment of the melt in pyroxene components leads to an increase, and conversely, enrichment in plagioclase and olivine

Abstract—The existing models of the formation of the Yessentuki mineral water deposits are analyzed on the basis of geothermal features of the formation, major and trace-element characteristics of salt composition, as well as isotope composition of aqueous (δ18О and δ2Н) and gas (δ13С in СО2 and СН4, 3Не/4Не) phases of carbonated mineral waters of the North Cis-Caucasus. It has been shown that water

Abstract— Uranium (U) (or U/Ca ratio) in speleothems has been suggested to be an indicator of soil humidity and effective rainfall in the Asian summer monsoon region. However, this argument has not yet been confirmed in modern cave monitoring studies. A 3-year (July 2011–August 2014) cave monitoring study was conducted to explore the seasonal variations of U in karstic waters (including cave water

Abstract—The article discusses the distribution of rare-earth elements in the igneous and metasomatic rocks of the Murovdag ore district of the Lesser Caucasus. It has been established that the metasomatites and host rocks of the Murovdag ore district are characterized by the predominance of light rare-earth elements over heavy ones. The whole complex of the data obtained indicates that the components

Abstract—The study aims to contribute to submarine hydrothermal particle geochemistry knowledge on the central part of the Hellenic Volcanic Arc. Hydrothermal fluids collected by scuba diving from active shallow hydrothermal venting areas on Milos Island in the Aegean Sea in East Mediterranean. Analysis carried out in suspended particles for Fe, Mn, Cu, Pb, Cd, Ca, Ba, Sr, Li, Al and Si. During sampling

Abstract—Analysis of zircons from Early Paleozoic calc-alkaline granitoids in the central part of the Angara–Vitim Batholith revealed two geochemically different zircon varieties. Central unaltered domains have homogenous BSE images, “magmatic” REE distribution pattern, and the moderate content of trace elements. Altered zones of zircon are characterized by more gentle patterns owing to the growth