V. A. Lebedev

V. A. Lebedev
Russian Academy of Sciences | RAS · Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM RAS)

PhD (Candidate of Sciences, Geology-Mineralogy)

About

260
Publications
44,025
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Introduction
Vladimir A. Lebedev currently works at the Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry (IGEM RAS), Russian Academy of Sciences. V. does research in Isotope Geochronology (K-Ar dating), Volcanology, Petrology, and Geochemistry. The most recent publication is 'Petrological-Geochemical Characteristics of Lavas, Sources and Evolution of Magmatic Melts of the Kazbek Neovolcanic Center (Greater Caucasus)'.
Additional affiliations
August 1993 - present
Russian Academy of Sciences
Position
  • The head of research group, leading researcher
Education
September 1988 - June 1993
Lomonosov Moscow State University
Field of study
  • Geology-geochemistry

Publications

Publications (260)
Article
Full-text available
The paper reports the isotope-geochronological and petrological-geochemical studies of the Pliocene moderately-acid volcanism of the Akhalkalaki Plateau in the central part of the Lesser Caucasus (Javakheti highland, Georgia). K-Ar dating showed that young dacitic lavas and pyroclastic rocks were formed in the mid-Pliocene (3.28 ± 0.10 Ma) in relat...
Article
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This paper is aimed at studying the chronological evolution of the Neogene–Quaternary volcanic activity within the Çaldıran plain and its mountainous framing (Eastern Turkey). It is shown that the last pulse of continental-margin magmatism related to the subduction and closure of Neotethys oceanic basin occurred in the Middle Miocene (13.5–12.5 Ma)...
Article
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The paper presents detailed isotope-geochronological, geological, and petrologic-mineralogical data on lavas of one of the greatest Quaternary magmatic area in the Greater Caucasus, the Kazbek neovolcanic center, including polygenetic Kazbek stratovolcano and a number of subordinate volcanic cones in its vicinities. The research was conducted based...
Article
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The series of two papers presents a comprehensive isotope-geochronological and petrological- geochemical study of the Late Quaternary Tendürek Volcano (Eastern Turkey), one of the greatest volcanoes within the Caucasian–Eastern Anatolian segment of the Alpine foldbelt. The second article discusses the results of petrogenetic modeling, role of AFC-p...
Article
We present new radiometric ages and full-vector paleomagnetic data from São Vicente Island, Cape Verde. Samples were obtained from a sequence of 11 nephelinitic flows. A K-Ar age determination was performed on the lowermost flow of the sequence, yielding an upper Miocene age of 6.07 ± 0.16 (2σ) Ma. Considering the normal polarity observed in all fl...
Article
The K–Ar isotope age and petrological–geochemical data were obtained for the first time on igneous rocks from a core recovered from previously drilled wells on the Sakhalin shelf. Based on these data, the igneous rocks were compared to the rocks of the Anivskiy, Orlovskiy, Lamanonskiy, and Chekhovskiy volcanic complexes. The isotopic ages obtained...
Article
We present new radiometric ages and full-vector paleomagnetic data from São Vicente Island, Cape Verde. Samples were obtained from a sequence of 11 nephelinitic flows. A K-Ar age determination was performed on the lowermost flow of the sequence, yielding an upper Miocene age of 6.07 ± 0.16 (2σ) Ma. Considering the normal polarity observed in all fl...
Article
Full-text available
В статье рассмотрены новые петролого-геохимические и изотопно-геохронологические данные для магматических пород хуламского вулкано-плутонического комплекса, распространенных в центральной части Северного Кавказа (Кабардино-Балкария). Показано, что умеренно-щелочные породы хуламского комплекса представлены бимодальной ассоциацией габбро+трахиандезиб...
Article
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This paper is concerned with new petrological-geochemical, and isotope-geochronological data for the igneous rocks that compose the Khulam volcano-plutonic complex in the central part of the North Caucasus (Kabardino-Balkaria). It is shown that the moderately-alkaline rocks of the Khulam complex are represented by a bimodal association of gabbro +...
Article
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The paper presents the frst data on the composition of REE and Nb mineralization in the Middle Jurassic moderately alkaline felsic and moderately acid rocks of the Khulam volcano-plutonic complex at the territory of Kabardino-Balkaria, central part of Northern Caucasus. The igneous rocks of the Khulam Complex (intrusive and subvolcanic facies) belo...
Article
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Представлены результаты изотопно-геохронологического и петролого-геохимического изучения молодых вулканических пород Гегамского нагорья (Центральная Армения), образовавшихся на плиоцен-раннечетвертичном этапе позднекайнозойского постколлизионного магматизма Малого Кавказа. Установлены границы ареала развития вулканической активности в этот период,...
Article
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The paper presents the results of isotope-geochronological and petrological-geochemical study of young volcanic rocks in the Geghama highland (Central Armenia), which were formed at the Pliocene–Early Quaternary stage of the Late Cenozoic post-collisional magmatism of the Lesser Caucasus. The boundaries of the area of volcanic activity manifested d...
Article
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Впервые получена серия из 10 изотопных K–Ar дат для лавовых центров Седанкинского Дола, расположенного в северной части Срединного хребта Камчатки. Установлено, что вулканизм в этом районе начал проявляться как минимум в среднем плейстоцене. Для доголоценового времени выделено четыре этапа активизация вулканизма (300–270, 180–160, 100–80 и между 50...
Article
For the first time, a series of 10 isotopic K-Ar ages was obtained for the lava centers of the Sedank-insky Dol, located in the northern part of the Sredinny Range of Kamchatka. We show that volcanism in this area started at least in the Middle Pleistocene. For the pre-Holocene time, four stages of volcanism activation were distinguished (300-270,...
Chapter
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The Caucasian-Arabian segment of the huge Late Cenozoic Alpine-Himalayan orogenic belt marks a zone of the indentation of the Arabian plate into the Eurasian plate. The segment is formed by two tectonic domains: (1) the NW-SE-striking Greater Caucasus (GC) at the north, represents the southern margin of East European Craton, tectonically uplifted a...
Article
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We report paleointensity results obtained with the multispecimen method (MSP) over the Pliocene sequence of Apnia (Georgia) which records a polarity reversal. Paleointensity determinations with the multispecimen technique were performed on 12 flows with the original (MSP‐DB) and the domain‐state corrected (MSP‐DSC) protocol. Eight MSP‐DSC determina...
Article
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Sixteen rhyolitic and dacitic Cretaceous and Paleocene‐Eocene lavas from the Lesser Caucasus have been subjected to paleomagnetic and multimethod paleointensity experiments to analyze the variations of the Earth's magnetic field. Paleointensity experiments were performed with two methods. Thellier‐type experiments with the IZZI method on 65 specime...
Article
Well-exposed lava sequences with available geochronological information may provide invaluable information on the fine characteristics of the Earth's magnetic field variation. A paleomagnetic study has been performed on twenty Pleistocene age, sub-horizontal lava flows in the Javakheti Highland (Lesser Caucasus). The sequence is formed by calc-alka...
Article
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An isotope-geochronological study for a number of young volcanic manifestations in the eastern part of Balkaria (North Caucasus, Russia) referred by previous researchers to the Neogene-Quaternary stage of evolution of the Greater Caucasus was carried out. The obtained results of K–Ar dating have proved for the first time that volcanic activity with...
Article
We report the chemical and isotopic compositions of volcanic rocks of the Akhtang and Kostina mountain massifs in the Sredinny Range, Kamchatka. The analyzed rocks are similar in composition to the earlier studied volcanics of the eastern flank of the southern part of the Sredinny Range. Results of K–Ar isotope dating reveal three stages of volcani...
Article
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The results of isotope-geochronological study of Quaternary mafic volcanism in the Kapan neovolcanic center (Southern Armenia) are discussed. The rocks studied are represented by alkaline basaltoids with haüyne as the main foid (ordanchites and haüyne basanites), which are unique for the Caucasian Region. As is evidenced from the K-Ar age results,...
Article
A first set of K–Ar isotopic ages obtained, which allowed to estimate the age of the largest volcanoes of the Anaunsky Dol (3.2, 2.2 and 1.9 Ma) and eruptive centers of the post-caldera stage of Uksichan massif (1.2 and 0.8 Ma), located in the Sredinny Range of Kamchatka. Significant time intervals separating the individual phases of volcanism sugg...
Article
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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
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K-Ar isotopic age of the beginning of formation of Ichinsky (0,35 Ma) and Khangar (0,4 Ma) stratovolcanoes is established for the first time, as well as the age of the final stage of activity of the Lauchan Ridge (about 0,9 Ma) in the Sredinny Range of Kamchatka. Probably the formation of the studied volcanoes may be caused by the generation of the...
Article
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The radiocarbon technique is widely used to date Late Pleistocene and Holocene lava flows. The significant difference with palaeomagnetic methods is that the 14C dating is performed on the organic matter carbonized by the rock formation or the paleosols found within or below the lava flow. On the contrary, the archaeomagnetic dating allows to date...
Article
K-Ar isotopic age of the beginning of formation of Ichinsky (0.35 Ma) and Khangar (0.4 Ma) stratovolcanoes is established for the first time, as well as the age of the final stage of activity of the Lauchan Ridge (about 0.9 Ma) in the Sredinny Range of Kamchatka. Probably the formation of the studied volcanoes may be caused by the generation of the...
Article
Full-text available
A paleointensity study has been carried out on a Pliocene sequence of 20 consecutive lava flows where previous directional results seem to reflect anomalous behavior of the Earth’s magnetic field (EMF), which can be explained by a polarity transition record or non-averaged paleosecular variation or both. Here, we perform a total of 55 paleointensit...
Conference Paper
Full-text available
Приводятся результаты петролого-геохимических и изотопно-геохронологических характеристик вулканитов, слагающих фундамент острова Матуа.
Conference Paper
Full-text available
Стратовулкан Ичинский (55o68'N, 157o73'E, 3607 м) – крупнейшая вершина Срединного хребта Камчатки – подстилается эффузивами гор Лаучан, Палец и др. (далее хребет Лаучан). До сих пор было не известно, когда этот вулканический массив начал формироваться. Мы провели изучение и K-Ar датирование ранних порций лав стратовулкана и финальных лав хребта Лау...
Article
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The area under study belongs to the Armenian part of the Armenian volcanic Highland. Previous investigations (Milanovsky, 1968; Trifonov et al., 2014, 2016; Trifonov, 2016) revealed that mountain systems of the Arabia-Caucasus region as well as other segments of the Alpine-Himalayan Belt rose significantly and rapidly during the Late Miocene and pa...
Conference Paper
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Изучен химический состав продуктов извержений вулканических массивов гор Ахтанг и Костина, расположенных на юго-восточном фланге южной части Срединного хребта Камчатки. По результатам K-Ar изотопного датирования для двух массивов впервые выявлены три этапа активизации вулканизма, разделенные продолжительными (1.4 и 2.4 млн лет) периодами покоя. В м...
Article
Full-text available
In this study, we implement multi-method approach to obtain higher quality and reliability of absolute paleointensity values compared to those obtained through the usual procedures that consist of a single paleointensity determination method. This new protocol is motivated by previous studies in which the reliability of the available paleointensiti...
Article
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The Pliocene–Quaternary paleogeography of the Euphrates River valley changed due to sinistral movements on the East-Anatolian Fault Zone (EAFZ) and the Taurus Ridge rise by movements on the South-Taurus Thrust. Evidence of these changes is based on studies of the Pliocene–Quaternary deposits of the Euphrates River basin to the north and to the sout...
Article
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Kandalaksha graben, located in the water-area of the White sea, is a part of the Onega-Kandalaksha paleorift of the Riphean time of foundation. It is filled with the terrigenous formations of the Terskaya suites ranging from 3 to 8 km by depth, while the age of the rocks of the Terskaya suite is still controversial, and according to different sourc...
Article
The Kalakan volcanic area in the Vitim region was formed in three stages: 137–121, 119–117, and 110 Ma. The first two stages were responsible for the formation of the mild-alkaline basaltic lavas of the Vitim Group and a complex of minor intrusions of the dolerite–granite porphyry series. The Early Cretaceous sequence is completed by a terrigenous...
Article
Full-text available
This paper presents the results from an isotope-geochronological and geochemical-petrological study of young volcanic rocks sampled in central Armenia, which were formed during the first stage of the Late Cenozoic magmatism in the Lesser Caucasus at the Miocene/Pliocene boundary. We have found the boundary of the area where the Miocene to Pliocene...
Article
Full-text available
В статье представлены результаты изотопно-еохронологического и петролого-геохимического изучения молодых вулканических пород Центральной Армении, образовавшихся на первом этапе позднекайнозойского магматизма Малого Кавказа на рубеже миоцена и плиоцена. Установлены границы ареала мио-плиоценового вулканизма, определены его масштабы и общая продолжит...
Article
This study deals with the origin of bifacial industry in the Lower Paleolithic of Southeast Asia. We describe stone tools from the stratifi ed sites of Goda and Rocktyng near the town of Ankhe, Vietnam. The lithics represent a homogeneous industry characterized by uniform Lower Paleolithic techniques of primary and secondary reduction. Cores and to...
Article
В статье рассматривается проблема происхождения бифасиальной индустрии в раннем палеолите Юго-Восточной Азии. Проанализированы каменные артефакты раннего палеолита стратифицированных стоянок Года и Роктынг, обнаруженных в районе г. Анкхе (Вьетнам). Данные материалы образуют гомогенную индустрию, в которой отчетливо проявляется единообразие способов...
Article
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В статье представлены результаты изучения хронологии развития неоген-четвертичной вулканической активности в пределах Чалдыранской равнины и ее горного обрамления (Восточная Турция). Показано, что последний импульс континентально-окраинного магматизма, связанного с субдукцией и закрытием океанического бассейна Неотетис, проявился здесь в середине м...
Article
Full-text available
The results of geochronological, petrological–mineralogical, and isotope-geochemical studies of the Tanadon gold deposit in the Greater Caucasus (Republic of North Ossetia–Alania) have made it possible to determine the age of ore veins and identify ore matter sources of sulfide mineralization. The Tanadon deposit is localized in Paleozoic synmetamo...