Yu.V. Gol'tsman's research while affiliated with Russian Academy of Sciences and other places

Publications (46)

Article
Full-text available
The results of petrological-geochemical and isotope-geochemical studies of the Late Pleistocene-Holocene lavas of the Kazbek neovolcanic center, one of the largest centers of youngest magmatism in the Greater Caucasus, are presented. It has been established that the volcanic rocks of the Kazbek center form a continuous compositional series basaltic...
Article
A system of variously sized basins filled with sediments and volcanic rocks was formed during Late Mesozoic time in Transbaikalia and adjacent areas of Mongolia and China. Magmatic formations are concentrated in three major volcanic belts: the Mongolia–West-Transbaikalia (MWT), the Mongolia–East-Transbaikalia (MET), and the Great Xing’an belt (GX)....
Article
Full-text available
An isotope-geochronological study of young magmatism in the central part of the Greater Caucasus (Kazbek neovolcanic area) on the territory of Russia and Georgia has been carried out. It was proved for the first time that, in the Early Pleistocene, there was a separate impulse of magmatic activity in this area. The K–Ar and Rb–Sr methods have been...
Article
The possibility of using hydrothermal fluorite as an Sm–Nd geochronometer is based on the results of an REE pattern study of this mineral (Chernyshev et al., 1986). As a result of REE fractionation, in many cases, the Sm/Nd ratio achieves a multifold increase compared with its level in terrestrial rocks, and the radiogenic shift of the ¹⁴³Nd/¹⁴⁴Nd...
Article
Full-text available
This paper presents isotope-geochronological and petrological study of granitoids of the potentially ore-bearing (Au–As–Sb–Sn–Mo) Early Pliocene Tsana Complex, which are confined to the Main Caucasus fault zone (upthrow fault) in the central part of the Greater Caucasus Range. The Tsurungal and Karobi groups of magmatic bodies are distinguished bas...
Data
Multi-layer geological map of the Elbrus neovolcanic center (Greater Caucasus). Scale 1/100000. Compiled by V.A. Lebedev (IGEM RAS) ©. File is in PSD (Photoshop) format. Layers: topography, hydrology and glaciers (snow line at September, 2010), infrastructure, geological borders, color fields. Reference should be given as: Lebedev V.A. Geological M...
Article
Full-text available
In this paper we report the first results of petrological and isotope-geochemical studies of young lavas of the Porak neovolcanic center within the eastern part of the potentially active Vardenis volcanic area of the Lesser Caucasus (Armenia). According to a number of material characteristics, the newest lavas of the Porak neovolcanic center are cl...
Article
Full-text available
The chronology of evolution of the young explosive volcanism in the Elbrus area of the Greater Caucasus is revealed. The isotopic–geochronological data indicate that ignimbrites and associated volcanic rocks were formed during the Middle Pliocene (3.0–2.75 Ma) and Early Pleistocene (0.84–0.70 Ma) stages of magmatic activity of the Greater Caucasus....
Conference Paper
Full-text available
Приэльбрусье является одним из тех немногих районов Кавказа, где неоген-четвертичный игнимбритовый вулканизм проявился в значительных масштабах. Покровы игнимбритов и ассоциированных с ними пирокластических пород сохранились в виде небольших останцов на западе, востоке и северо-востоке этого региона в верховьях рек Малка, Чучхур, Чомарткол, Бийтик-...
Chapter
Full-text available
The actual collective monograph presents the results of both theoretical and experimental studies of actual problems of modern geophysics in order to mitigate issues on seismic hazards and consequent risks on the territory of Russian Federation. New methods and technologies for mitigation of possible catastrophic events, including manifestations of...
Article
Full-text available
Complex geochronological and isotope-geochemical studies showed that the Late Quaternary Elbrus volcano (Greater Caucasus) experienced long (approximately 200 ka) discrete evolution, with protracted periods of igneous quiescence (approximately 50 ka) between large-scale eruptions. The volcanic activity of Elbrus is subdivided into three phases: Mid...
Data
Multi-layer geological map of Elbrus Volcano (Greater Caucasus), the highest peak of Europe. Scale 1/25000. Compiled by V.A. Lebedev (IGEM RAS) ©. File is in PSD (Photoshop) format. Layers: topography, rivers and glaciers (snow line at September, 2010), mounts, infrastructure, geological borders, color fields. Reference should be given as: Lebedev...
Article
Full-text available
The isotopic (δD, δ18O, δ13C, and 87Sr/86Sr) and geochemical characteristics of hydrothermal solutions from the Mid-Atlantic Ridge and the material of brucite-carbonate chimneys at the Lost City hydrothermal field at 30°N, MAR, were examined to assay the role of the major factors controlling the genesis of the fluid and hydrothermal chimneys of the...
Article
Full-text available
This paper presents results of the Rb‐Sr and K‐Ar isotope‐geochronological study of the Sukhoi Log deposit, one of the world’s largest noble metal deposits localized among metasedimentary black shales. The deposits of this type (Muruntau, Uzbekistan; Nezhdaninskoe, Russia; Ashanti, Gana; and others) account for a considerable part in the balance of...
Article
Full-text available
The problem of eclogite formation occupies an important place in paleodynamic reconstructions of the geological history of the Urals. To date, the overwhelming majority of researchers have accepted that the eclogite‐glaucophane schist complexes in the mobile belt are related to the subduction-related and collisional geodynamic regimes. The age of h...
Article
Full-text available
The isotope–geochronological data obtained reveal a large center of Late Quaternary volcanism in the southern part of Republic of Georgia – Samsari volcanic center, with its main development phases corresponding to phases of magmatic activity previously defined for other areas of neovolcanic activity in the Caucasus region. According to these data,...
Article
New potentialities of isotope geochronology including K-Ar-method make it possible to describe history of both individual volcanoes and large volcanic areas in period since early to the last stages of their development. Determination of potential volcanic hazard is possible. Investigations of known volcanic centers have been performed. Results of t...
Article
Full-text available
K-Ar and Rb-Sr isotopic geochronologic data were first used to constrain the timing and duration of magmatic activity at modern volcanic centers in the Greater Caucasus. The main dating technique was a modification of the K-Ar method with the utilization of low-background high-precision equipment and a technique that ensures the reliable analysis o...
Article
The results of the calibration of strontium standards on a Sector 54 multicollector isotope mass spectromeler are reported. 87Sr/86Sr ratios are measured accurate to ±0.0005% (1σ). The external precision was ±0.0005-0.001% (1σ). The data from international Sr-standards SRM-987 and Eimer & Amend and the Russian standard VNIIM allowed us to normalize...
Article
Full-text available
The aim of this paper was to report and discuss the data available for the K-Ar dating of effusive rocks from a few centers of recent volcanic activity in the Kazbek region (Great Caucasus) of the Caucasian segment of the Mediterranean (or of the Alpine-Himalayan) mobile belt separating the African-Arabian and European platforms. These data were ob...
Article
Full-text available
This paper presents the results of complex isotope (K-Ar, 40Ar/39Ar, Rb-Sr) studies of one of the largest tin-ore district in Russian Far East - Verkhneurmi ore field. Geochronological data, obtained using modern approaches and techniques, allowed us to determine a total evolution duration of Verkhneurmi hydrothermal-magmatic system (> 20 Ma) and d...
Article
The number and age of hyperacidic volcanism events in late-orogenic troughs of the Chatkal-Kurama structural zone are discussed on the basis of the radiometric dating. All K-Ar data available are used, including 90 original age determinations. The results of Rb-Sr dating obtained for five liparitic and trachyliparitic volcanic bodies of the region...
Article
Petrological analysis of magmatic and metasomatic rocks and their K-Ar and Rb-Sr isotope dating show that the multistage tectonomagmatic activization in the study area lasted from the Late Triassic to the Middle Cretaceous. Four stages (impulses) of magmatic and hydrothermal activity were distinguished, each of which continued for 15-20 Ma and was...

Citations

... suggest there is a common Caucasus mantle composition that is represented by trachy-basalts similar to oceanic island basalts (OIB) erupted in central Georgia, such that intermediate composition rocks from the central range of the Greater Caucasus have undergone small amounts of crustal assimilation (e.g. Parfenov et al., 2019), whereas the silicic volcanics of the western range require significant (50%) crustal assimilation (e.g. Lebedev et al., 2010). ...
... The oldest mastotermitid was recovered from Cretaceous age (near 127 Ma) deposits of Chernovskie Kopi, eastern Transbaikalia (Vršanský and Aristov 2014;Vršanský et al. 2017Vršanský et al. , 2019. This locality is characterized by a complex rhythmical association of volcanic-sedimentary rocks, with lakes that were periodically covered by volcanic ash (Stupak et al. 2018). Reconstructed palaeoenvironment consisted of high-mountain, caldera lakes characterized by punctuated populations and surrounding vegetation consisting mostly of horsetails. ...
... The next magmatic pulse was dated at the Early Pleistocene (1.4-1.3 Ma), when a number small volcanic cones were formed and numerous dacite dikes were emplaced in the Main Caucasus Range zone (Lebedev et al., 2017). In the late Quaternary over the past 500-400 Ma, magmatic activity in the Kazbek area was constrained to the Kazbek, Keli, Kabardzhini, and Java neovolcanic centers (Lebedev et al., 2011b;Lebedev and Vashakidze, 2014). ...
... Therefore, Sm-Nd isotope dating is an effective method for precisely determining the time of hydrothermal events [14][15][16], even for relatively young mineralization [17]. It has been successfully used for dating hydrothermal Ca-bearing minerals, such as calcite [18][19][20], scheelite [15,21,22], fluorite [23][24][25], and tourmaline [15,21]. ...
... K-Ar dating of samples was carried out using a highly sensitive low-noise technique developed in IGEM RAS (Moscow) to determine the age of young rocks. Its detailed description, including geochemical background, characteristics of mass-spectrometric equipment, description of the procedure, and assessment of measurement accuracy are reported in (Chernyshev et al., 2006;Lebedev et al., 2016cLebedev et al., , 2018. The groundmass of lavas and matrix of subvolcanic rocks were used as K-Ar geochronometers. ...
... Measurements were taken on a modified MI1201T mass spectrometer. The mass spectrometry data were calibrated against the NBS-987 isotopic standard, which was 87 Sr/ 86 Sr = 0.71027 ± 0.00004 (according to analysis based on three measurements), the recommended value being 87 Sr/ 86 Sr = 0.71025 (Chernyshev et al., 2000). The measurement accuracy for 87 Rb/ 86 Sr, according to parallel measurements, was ~1 rel.%; for 87 Sr/ 86 Sr, no more than 0.015 rel.%. ...
... The structure, mineralogical, and geochemical features as well as the origin of the mineralization of the Dzhidinskoe ore field have been studied by many researchers [1][2][3][4][18][19][20][21][22][23][24][25][26][27][28]. All the researchers marked the following feature of the Dzhidinskoe ore field: the hydrothermal ore formation had a pulsating character and repeatedly alternated with magmatic injections of mainly granite composition, and the ore mineralization profile changed in the following sequence: MoMo + BeBe + WW + Pb, Zn. ...
... of the section contains Asselian and Sakmarian fauna and flora; clastic rocks overlying volcanites contain Kazanian (Wordian) flora remnants [18]. The Rb-Sr isochron ages of lavas and comagmatic intrusions are in the range of 268-284 Ma [17,18]; the Ar-Ar age of rhyolite is 292 Ma [17]; the U-Pb ages of granites are in the range of 275-300 Ma [78]. ...
... They are characterized by the development of dioctahedral illites and mixed-layer illites-smectites associated with ferric carbonates and quartz. Below, these rocks are called "hydromica metasomatic rocks" (Andreeva, 1979;Andreeva and Golovin, 1998;Andreeva et al., 1996). ...
... is approximately located on the northern slope of Aragats volcano (depth of ~7 to 13.66 km), which may be the reason for the existence of magma. Based on I.V.Chernyshev et al., 2002 and Vadim Milukov et al., 2018 studies, the Aragats center, one of the largest Quaternary volcanic centers in the Caucasus, is con ned to the Aragats neovolcanic area located in the western part of Armenia, at the intersection of tectonic zones of a general Caucasian extension and the sublongitudinal Transcaucasus uplift. The development of the Pliocene-Quaternary volcanism of the Aragats area is de ned by complex late collisional Geodynamics, which is related to global processes of the convergence of Eurasian and Arabian continental plates. ...