S. G. Skublov

Russian Academy of Sciences | RAS · Institute of Precambrian Geology and Geochronology

The aim of the present contribution was to evaluate the trace element mobility in olivine, low-Ca pyroxene and plagioclase of the Kargapole meteorite under thermal or impact metamorphic conditions and recognition of the properties of chondrule-forming events. The compositions of the minerals were analyzed using an electron probe microanalyser (EPMA...

For the leucogranites of the Belokurikha massif, depletion of LREE and HFS elements was established as a result of fractionation of the granite melt while maintaining the unchanged content of LIL elements. High content of rare-earth elements (up to 87800 ppm) and Y (up to 50000 ppm) was found in zircon from leucogranite. The anomalous composition o...

The composition and mineral associations of amphiboles from marbles of the Luk Yen deposit of colored stones, northern Vietnam have been investigated. It was found that in ruby-bearing marbles, amphiboles are found in association with tourmaline, anorthite, phlogopite and are represented by pargasites and sadanagaites. Moreover, they are enriched i...

The paper presents the results of U–Pb SHRIMP-II dating and isotope-geochemical data on zir- con xenocrysts extracted from igneous rocks of the Shaka Ridge, South Atlantic. We compared the obtained data and the results of studying young “oceanic” zircons from rocks of the Atlantis Bank, Central Atlantic. The age of xenogenic zircon grains, recorded...

The results of SIMS and EPMA studies on the silicate minerals and bulk compositions (SEM-EDS) of porphyritic and nonporphyritic chondrules from Elenovka and Knyahinya meteorites are reported. The trace element composition of silicate minerals (olivine, low-Са pyroxene) in equilibrated ordinary chondrites (EOC) has not been affected considerably by...

A comprehensive isotope-geochemical study of zircon (oxygen isotopic composition, trace element composition, and U-Pb SIMS dating) from two samples (50 points) of ore-bearing red-colored and gray-colored sandstones of the Pizhemskoye deposit (Middle Timan) made it possible to establish that peak values in the age spectrum are at around 1200 and 150...

This paper presents data on the age of the volcanites of the Sommers Island. Sommers, located to the south of the submarine extension of the Vyborg Massif. Volcanites are probable comagmates of the Rapakivi granites. The U-Pb system of zircon from Early Riphean volcanics was studied to determine their geochronological age using the SHRIMP-II ion mi...

A study of the trace element composition of beryl varieties (469 SIMS analyses) was carried out. Red beryls are distinguished by a higher content of Ni, Sc, Mn, Fe, Ti, Cs, Rb, K, and B and lower content of Na and water. Pink beryls are characterized by a higher content of Cs, Rb, Na, Li, Cl, and water with lower content of Mg and Fe. Green beryls...

Eclogites of the Belomorian Mobile Belt (BMB) are a key object for geodynamic reconstructions not only of the BMB, but also of the entire Fennoscandian Shield. One of the main issues for BMB eclogites is the establishment of the time of their formation. The interpretation of the age of the BMB eclogites as Archean allowed some researchers to extend...

The article provides an evaluation of thermal metamorphism temperatures on chondrite parent bodies using an olivine-Сr spinel geothermometer. To calculate temperatures, the results of EPMA analysis of the major and trace elements in olivine and Cr spinel of Kargapole, Orlovka, Saratov, Elenovka, Buschhof, Bjurböle and Knyahinya meteorites are used....

This paper is dedicated to the isotope-geochemical study of zircon from riebeckite granites of the Verkhnee Espe rare earth-rare metal deposit and the specification of its U–Pb age. Zircon from the Verkhnee Espe massif is peculiar in the high content of non-formula elements (up to 43000 ppm REE, up to 22000 Y, and others) and demonstrates a clearly...

Beryl occurs in the ancient Roman mines at Wadi Nugrus, South Eastern Desert of Egypt. It ranges from small crystals to 10 mm in size, and it varies in color, appearing as bright green, pale green, dark green and brown-green with biotite inclusions. The trace and minor elements were analyzed by the SIMS method. The two rims are richer in Cs, Na, Mg...

Titanite is a U-bearing accessory mineral that can serve as a geochronometer. Compared with zircon, titanite is more likely to contain multi-stage fluid-induced growth. Thus, individual titanite grains may yield complex UPb ages that reveal the entire geological history of the rock. Secondary ion mass spectrometry (SIMS), which has high sensitivity...

Over the past two decades, a significant number of discoveries of ancient zircon xenocrysts in ocean-floor magmatic rocks have been reported. These findings provide compelling evidence for the presence of ancient continental crust within young oceanic lithosphere. Almost all finds of ancient zircon xenocrysts within oceanic crust are from the Mid-A...

Volodichev et al. (Volodichev et al., 2021) reported on the first finding of omphacite (23%–25% Jd) inclusions in 2.68 Ga metamorphic zircons from Gridino eclogites and presented it as evidence for Archean eclogite-facies metamorphism in the Belomorian Mobile Belt. We believe that the Archean age of the garnets referred to by the above authors was...

This paper presents the results of dating (U-Pb method, SHRIMP-II) and isotope geochemical data (oxygen δ18O, rare elements and REE) for zircon xenocrysts from igneous rocks of the Shaka Ridge (South Atlantic) as well as the results of comparative analysis of zircon from the Shaka Ridge with young zircon of oceanic origin from the rocks of Atlantis...

Detrital zircons with an age of 3.65-3.87 Ga have been found earlier in Jatulian terrigenous rocks from the eastern Fennoscandian Shield, i.e., the Karelian and Kola regions (Kozhevnikov et al., 2010; Smol'kin et al., 2011, 2019), while rocks of this age are not reported in the inferior Sumian-Sariolian complexes and in the Archean basement. To est...

Zircon grains from syenogranite of Wadi Ras Abda area were studied to identify the geochemical behavior of REE and trace elements during magmatic crystallization and hydrothermal processes and reconstruct timing of events. Zircon grains are elongated and long prismatic crystals. The internal structures in cathodoluminescence images show patchy and...

Впервые проведено изотопно-геохимическое исследование (SHRIMP-II, SIMS) циркона из сиенитов горы Рудная, включающих в себя недавно открытое Морозкинское золоторудное месторождение, расположенных в Южной Якутии. Гора Рудная представляет собой сиенитовый массив в форме лакколита и находится в пределах Центрально-Алданского рудного района. Золоторудна...

This paper presents the first isotope-geochemical study (SHRIMP-II, SIMS) of zircons from syenites of Gora Rudnaya (South Yakutia), which host the recently discovered Morozkinsky gold deposit. Gora Rudnaya is a laccolith located in the Central Aldan ore district. Vein and vein-disseminated gold mineralization occur in low-temperature acid metasomat...

This article presents new isotope-geochronological results for the granites of the Voznesensky ore district (southeastern part of the Khanka massif). The granites are associated with extensive rare-metal–fluorite, tin and tantalum mineralization. Despite the numerous published results of Rb–Sr, Sm–Nd and U–Pb dating of ore-bearing granites and asso...

The monzogranite of El Fereyid is one of the rare metal–rich granites, where zircon is one of the ore minerals. Thus, studying zircon here is of vital importance. Most of the studied zircon grains are metamict and thus the loss of radiogenic Pb is detected for them. Nevertheless, our study allowed us to obtain the U–Pb (SHRIMP–II) age of magmatic c...

It was found as a result of SIMS study of beryl with various color zoning from the Uralian Izumrudnye Kopi that the content of a number of trace elements regularly varies to the margin of the crystal regardless of the color nature of the central and marginal crystal parts. The Na, Mn, Ga, Fe and Rb content increases towards the periphery of both cr...

Abstract—A study of specific aggregates of corundum from kimberlite and lamproite of the Ukrainian Shield has been carried out. The presence of unusual segregations of oxides, silicates, and highly reduced phases is a characteristic feature of these aggregates. Oxide and silicate phases fill the interstitials between corundum grains and include oxi...

The comments are given on the article authored by M.V. Mints and K.A. Dokukina – The Belomorian Eclogite Province (Eastern Fennoscandian Shield, Russia): Meso-Neoarchean or Late Paleoproterozoic? (Geodynamics & Tectonophysics 2020, 11 (1), 151–200). The Belomorian (White Sea) province of the Fennoscandia Shield is a key site for studying the tecton...

В работе представлены результаты комплексного геохимического и изотопно-геохимического (SHRIMP-II, SIMS) исследования пород Джелтулинского массива, расположенного в малоизученном Тыркандинском рудном районе. Массив в пределах рудного района является самым крупным по масштабам выхода на поверхность и представляет собой кольцевой плутон, сложенный ул...

Very few zircon-bearing, kimberlite-hosted mantle eclogite xenoliths have been identified to date; however, the zircon they contain is crucial for our understanding of subcratonic lithospheric mantle evolution and eclogite genesis. In this study, we constrain the characteristics of zircon from mantle eclogite xenoliths based on existing mineralogic...

As a result of isotope-geochemical study, the age data (U-Pb method, ID-TIMS) of titanite from the first phase granites of the Belokurikhinsky granite massif, Gorny Altai, were obtained for the first time. The concordant value of the titanite age of 255 ± 2 Ma coincides within the margin of error with the previously published results of dating mica...

The article presents original data of chemical composition of tholeiitic basaltoids and andesites, dredged from the Shaka Ridge (South Atlantic) in the course of field research in spring 2016 on the scientific expedition vessel “Akademik Fedorov”. The analytical part of the work on estimating the contents of petrogenic, trace and rare-earth element...

This study highlights the usefulness of rutile when applied for reconstruction of the metamorphic evolution of ultrahigh-pressure rocks containing diamond. Within the diamondiferous kyanite gneiss (Kokchetav massif, Northern Kazakhstan), rutile shows three distinct textural positions: (i) rounded/irregular-shaped grains in the rock matrix; (ii) mon...

The formation of leucosyenites in the Velyka Vyska syenite massif was provoked by the liquation layering of magmatic melt. This assumption is based on the presence of two primary melt inclusions of different chemical composition in zircon crystals from Velyka Vyska leucosyenites. They correspond to two types of silicate melts. Type I is a leucosyen...

Granulite complex on the left side of the Bol. Kuonamka River, below the mouth of the Khapchan River, is composed of melanocratic and mesocratic orthopyroxene–clinopyroxene crystalline schists and leucocratic orthopyroxene and orthopyroxene–clinopyroxene plagiogneisses. The granulites formed after mafic to felsic volcanoplutonic rocks with rare sed...

The Belomorian Province of the Fennoscandian Shield exposes numerous Precambrian eclogites, which makes it significant for the study of early tectonic processes. The age of these eclogites has been discussed for more than 15 years and regarded as either Archean or Paleoproterozoic. In the Kuru-Vaara quarry within the northern Belomorian Province, t...

An abundance of the trace elements has been determined in olivine of the Archean spinel-bearing phlogopite harzburgite enclave (sample UR17/2) from the Bug granulite complex of the Ukrainian Shield by SIMS analysis. Major elements were analyzed in the olivine by SEM-EDS and EPMA analysis. The olivine shows a homogeneous chemical composition: MgO —...

The distribution of rare-earth elements (SIMS method) in minerals from the rocks of the Khitoostrov occurrence (Belomorian mobile belt of Eastern Fennoscandia) was studied: corundum-bearing metasomatites with anomalous isotopically light oxygen and hydrogen and garnet amphibolites after gabbro with normal isotopic composition. The study was accompa...

The present study contains the detailed ion microprobe data on trace and rare earth elements distribution in the large zircon crystal about 10 × 6 mm in size with distinct growth and sector zonings from Ilmen Mountains feldspathic pegmatite. The zircon crystal morphology is a combination of a prism {110} and a dipyramid {111}. It is found out that...

The paper presents results of SIMS and SEM-EDS studies of the silicate minerals from one radial and one granular chondrule of the Buschhof ordinary equilibrated L6 chondrite and discusses geochemical features of the olivine, pyroxene, and plagioclase from the chondrules and matrix of this meteorite. Results show that pyroxene and plagioclase from t...

This paper presents a complex mineralogical and geochemical characteristic (based on SEM-EDS, ICP-MS analysis) of the fahlband rocks of the Kiv-Guba-Kartesh occurrence within the White Sea mobile belt (WSMB). The term “fahlband” first appeared in the silver mines of Kongsberg in the 17th century. Now fahlbands are interlayers or lenses with sulfide...

The Sandow Group in the Denman Glacier area consists of low-grade supracrustal (post-cratonic) strata. Such rocks are scarce and poorly studied in East Antarctica, but are significant for a better understanding of the geological history and tectonic evolution of the Precambrian supercontinents. We report U–Pb (LA-ICP-MS) detrital zircon ages which...

The results of a comprehensive study of the garnet chemical composition from the Bergen Arcs eclogites and their protoliths are presented in the paper. The Bergen Arcs system is a part of the Caledonian Orogen in western Norway. The eclogites are formed in shear zones. Field works were carried out in Holsnøy island (SW Norway). The study included S...

В работе представлены результаты изучения пород вулканокластических фаций лампроитовой трубки Мрия, Приазовский блок Украинского щита. В них был обнаружен комплекс экзотических минеральных час-тиц, сформированных в экстремально-восстановительных мантийных условиях: силикатные сферулы, части-цы самородных металлов и интерметаллических сплавов, бески...

The article presents the results of studying of the pyroclastic facies of the Mriya lamproite pipe, located at Azov block of the Ukrainian shield. In them have been discovered an association of exotic mineral particles formed under super-reduce mantle conditions. These include silicate spherules, particles of native metals and intermetallic alloys...

The paper presents U-Pb zircon dates (SHRIMP-II) and isotopic-geochemical data (SIMS and Sm-Nd method) on detrital zircon and its sedimentary host rocks of the Daldyn Group at the Anabar Shield. The rocks were metamorphosed to the granulite facies. The oldest Eoarchean (3.7 Ga) source of terrigenous material (determined based on single zircon grain...

The gold mineralization in the Central Aldan ore district is genetically related to potassic calc-alkaline and alkaline magmatism dated at 115–150 Ma. The objective of this study is to establish the age of hydrothermal processes that accompanied the formation of Au-Te mineralization at the Samolazovsky Deposit. Based on the isotope-geochemical stud...

Quartzites and paragneisses of the Archean granulite series of the Anabar Shield (Siberian Craton, Russia) are described geochemically. The Sm-Nd isotope systematics of the rocks and the U-Pb age (SHRIMP II) and geochemistry of zircons from quartzites and paragneisses are studied. Newly formed zircons from quartzites display geochemical characteris...

The article presents the results of studying the rocks of the pyroclastic facies of the Mriya lamproite pipe, located on the Priazovsky block of the Ukrainian shield. In them the rock's mineral composition includes a complex of exotic mineral particles formed under extreme reduction mantle conditions: silicate spherules, particles of native metals...

This report presents new data on U-Pb geochronology, oxygen isotopes, and trace element composition of zircon from a pegmatite vein crosscutting an eclogite boudin on Stolbikha Island, Gridino area, Belomorian mobile belt (BMB). The zircon grains occur as two distinct populations. The predominant population is pegmatitic and shows dark cathodolumin...

In the northern part of the Anabar Shield, orthopyroxene plagiogneisses of the granulite Daldyn Group host lenses of mafic rocks surrounded by melanocratic rims. According to their chemical composition, the mafic rocks correspond to subalkaline gabbro, the plagiogneisses correspond to granodiorites contaminated with mafic material, and the rims are...

The detailed mineralogical-geochemical study of eclogites and their retrograde products (amphibolites in a rim of eclogite boudin) from Vichennaya Luda Island (Keret Archipelago, White Sea) revealed systematic variations in major-, trace and rare-earth element composition of rock-forming minerals, which should be taken into account in geochronologi...