Alexander V Sobolev

Alexander V Sobolev
Université Grenoble Alpes · Institute Science de La Terre, ISTerre

PhD, Doctor Science

About

273
Publications
58,717
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12,356
Citations
Additional affiliations
January 2016 - present
Université Grenoble Alpes
Position
  • Professor (Full)
October 2009 - January 2016
University Joseph Fourier - Grenoble 1
Position
  • Professor (Full)
January 2009 - January 2010
Georg-August-Universität Göttingen
Position
  • Gauss Professor

Publications

Publications (273)
Article
Full-text available
Recycling of oceanic crust through subduction, mantle upwelling, and remelting in mantle plumes is a widely accepted mechanism to explain ocean island volcanism. The timescale of this recycling is important to our understanding of mantle circulation rates. Correlations of uranogenic lead isotopes in lavas from ocean islands such as Hawaii or Icelan...
Article
Full-text available
Archaean komatiites (ultramafic lavas) result from melting under extreme conditions of the Earth's mantle. Their chemical compositions evoke very high eruption temperatures, up to 1,600 degrees Celsius, which suggests even higher temperatures in their mantle source. This message is clouded, however, by uncertainty about the water content in komatii...
Article
Full-text available
A new olivine reference material – MongOL Sh11‐2 – for in situ analysis has been prepared from a central portion of a large (20 cm × 20 cm × 10 cm) mantle peridotite xenolith from a ~ 0.5 Ma old basaltic breccia at Shavaryn‐Tsaram, Tariat region, central Mongolia. The xenolith is a fertile mantle lherzolite with minimal signs of alteration. Approxi...
Article
Full-text available
Water strongly influences the physical properties of the mantle and enhances its ability to melt or convect. Its presence can also be used to trace recycling of surface reservoirs down to the deep mantle1, which makes knowledge of the water content in the Earth's interior and its evolution crucial for understanding global geodynamics. Komatiites (M...
Article
Full-text available
Homogenized melt inclusions in olivine were studied in Archean komatiites from the Barberton greenstone belt, Weltevreden formation in South Africa (3.3 Ga), Abitibi Greenstone belt in Canada (2.72 Ga), and the Belingwe Greenstone belt in Zimbabwe (2.69 Ga). Contamination of the komatiite melts with the crustal material enriched in Rb, Cl and H2O d...
Article
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Here, we present the results of 55 one atmosphere experiments conducted to determine the effects of Na2O and K2O on Ni-Mg partitioning between olivine and highly alkaline melts. The experiments were performed in the temperature range of 1250–1450 °C at Ni/NiO buffer conditions using a crucible-supported loop technique, which allowed the alkali cont...
Presentation
Full-text available
Trace element analysis in olivine is challenging but vital, since trace element concentrations in olivine could potentially record conditions of olivine crystallization and, correspondingly, conditions of magma generation, evolution, and/or transport dynamics. Currently, electron microprobe analyses (EPMA) for olivine remain the most popular for ma...
Conference Paper
Full-text available
Trace element analysis in olivine is challenging but vital, since trace element concentrations in olivine could potentially record conditions of olivine crystallization and, correspondingly, conditions of magma generation, evolution, and/or transport dynamics. Currently, electron microprobe analyses (EPMA) for olivine remain the most popular for ma...
Article
Full-text available
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 pl...
Article
Pyroxenites from Voykar Ophiolite mantle section provide a great record of processes happening during final stages of evolution of an ophiolite. They are represented by the complete range from clino- to ortho-pyroxenites with websterites and complex dunite-pyroxenite veins also present. Their formation is attributed to various degrees of fractional...
Conference Paper
Full-text available
The ERC Synergy project: Monitoring Earth Evolution Through Time (MEET) started in November 2020. Here we report results of study of melt inclusions and host high-Mg olivine phenocrysts of komatiites and related picrites from Phanerozoic localities: Gorgona, Colombia (0.09 Ga), Song Da, Vietnam (0.26 Ga), and Archean localities: Belingwe belt, Zimb...
Article
Full-text available
Исследованы составы гомогенизированных включений расплава и вмещающих вкрапленников оливина из архейских коматиитов пояса Барбертон, провинции Велтефреден, Южная Африка (возраст 3.3 млрд. лет); пояса Абитиби, Канада (возраст 2.72 млрд. лет) и пояса Белингве, Зимбабве (возраст 2.69 млрд. лет). Показано, что кристаллизация вкрапленников оливина в ком...
Article
Full-text available
Mesozoic (125-135 Ma) cratonic low-Ti lamproites from the northern part of the Aldan Shield do not conform to typical classification schemes of ultrapotassic anorogenic rocks. Here we investigate their origins by analyzing olivine and olivine-hosted inclusions from the Ryabinoviy pipe, a well preserved lamproite intrusion within the Aldan Shield. F...
Article
Full-text available
An Amendment to this paper has been published and can be accessed via a link at the top of the paper.
Preprint
Full-text available
H2O strongly influences physical properties of the mantle and its ability to melt or convect and can trace recycling of surface reservoirs down to the deep mantle1,2. This makes knowledge of water content in the Earth's interior and its evolution through time crucial to understanding global geodynamics. Komatiites (MgO-rich ultramafic magmas) resul...
Article
Full-text available
Mesozoic dikes associated with the Karoo plume were studied within the East Antarctica where at Queen Maud Land on the Almannryggen massif high-Ti magnesian Fe-basalts were found. It is assumed that such basalts originate by means of the pyroxenite-containing mantle melting. The isotopic characteristics of the studied dolerites reflect the composit...
Article
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The formation of Bermuda sampled a previously unknown mantle reservoir that is characterized by silica-undersaturated melts enriched in volatiles and by a unique lead isotopic signature, which suggests that the source is young.
Article
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The Mesozoic dykes related to the distribution of Karoo plume on the territory of East Antarctica are studied. It is shown that magnesian high-Ti ferrobasalts are found in the area of Ahlmannryggen massif. Their formation is determined by melting of the mantle that contains pyroxenite. The isotope characteristics of the studied dolerites reflect th...
Article
Full-text available
The objects of study are Triassic hypabyssal diamondiferous kimberlites with an age of 220-245 Ma, containing macrocrysts of unaltered olivine. The latter are close in the time of formation to the main stage of intrusion of the Siberian Trap Province (252 Ma), which lasted less than 1 Myr. A comparative high-precision analytical study of the Ti, Ca...
Article
Full-text available
Obtained data shows that high-potassic dyke rocks of the Ryabinoviy massif (Central Aldan) belong to low-titanium lamproite series (Mediterranean type) and are distinct with “classic” high-titanium lamproites. Based on Al-in-olivine thermometer, temperature of olivine–chrome-spinel pair crystallization varies in range between 1100 and 1250°C. This...
Article
Full-text available
We have studied mineral-hosted melt, crystal and fluid inclusions from two ugandite, one mafurite and two katungite samples from the Toro-Ankole volcanic province in the East African Rift, which is the archetypal location for kamafugitic rocks. A main finding of our study is the presence of orthopyroxene as inclusions in an early generation of oliv...
Article
Mantle plume-derived melts provide a unique glimpse into the chemical heterogeneity of the deep mantle. However, the exact processes involved in forming and sampling lower mantle heterogeneities remain unresolved and thus, require further investigation to understand the cumulative effects of planetary differentiation, crustal recycling, and mantle...
Conference Paper
Full-text available
Эксперимент проводится при атмосферном давлении и контролируемой летучести кислорода, заданной с точностью превышающей 0.1 лог.ед. в диапазоне значений от IW-4 до FMQ+4 лог.ед. Прогрев отобранных зерен, помещенных в платиновые ампулы, проходит в три главных этапа. Во время нагрева при температуре на 200-400оС ниже рассчитанной происходит насыщение...
Article
Full-text available
Numerous summit and parasitic eruptions of moderate potassium magnesian and high-alumina basalts and basaltic andesites, their mineralogic and geochemical features, and the composition of in situ chilled melt inclusions in the olivine of cinder lapilli discharged by Klyuchevskoi Volcano all provide evidence of the presence of magma chambers beneath...
Article
Full-text available
Use of the electron probe microanalyser (EPMA) for trace element analysis has increased over the last decade, mainly because of improved stability of spectrometers and the electron column when operated at high probe current; development of new large-area crystal monochromators and ultra-high count rate spectrometers; full integration of energy-disp...
Article
Full-text available
High-Mg, low-Ti volcanic rocks from the Manihiki Plateau in the Western Pacific share many geochemical characteristics with subduction-related boninites such as high-Ca boninites from the Troodos ophiolite on Cyprus, which are believed to originate by hydrous re-melting of previously depleted mantle. In this paper we compare the Manihiki rocks and...
Article
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Tholeiitic melts from the Bouvet triple junction (BTJ) of rift zones in the South Atlantic are moderately enriched rocks with specific lithophile-element patterns. The high (Gd/Yb)n values (up to 2.5) in some tholeiite compositions suggest the presence of garnet in the mantle source of primary BTJ melts. The high Ni and low Mn contents of the most...
Article
Full-text available
Data are presented on the equilibrium compositions of olivine and melts in the products of 101 experiments performed at 1300–1600 C, atmospheric pressure, and controlled oxygen fugacity by means of new equipment at the Vernadsky Institute. It was shown that the available models of the olivine–melt equilibrium describe with insufficient adequacy the...
Article
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Large igneous provinces and some hotspot volcanoes are thought to form above thermochemical anomalies known as mantle plumes. Petrologic investigations that support this model suggest that plume-derived melts originated at high mantle temperatures (greater than 1,500 °C) relative to those generated at ambient mid-ocean ridge conditions (about 1,350...
Article
Full-text available
The formation conditions of the parental magmas of Gorely volcano, which is located behind a volcanic front in Southern Kamchatka, have been evaluated using the modern methods of micro-element ther-mobarometry. These magmas contained 1.7 ± 0.8 (2σ) wt % of H2O, the majority (82%) of which has been lost from inclusions. They crystallized at 1121 ± 1...
Data
The Bouvet Triple Junction (BTJ) consists of three main structures of the oceanic floor: Mid Atlantic Ridge (MAR), American Antarctic Ridge (AAR) and Southwest Indian Ridge (SWIR). Tholeiitic basalts were dredged during the research cruises: 18 A/V “Akademic Nikolay Strakhov” (S18) and “Gelendzhik”-96 (G96). 14 stations were distributed along two S...
Article
The Aeolian arc (Italy) is characterized by some of the strongest along-the-arc geochemical variations in the planet, making it an ideal location to study the effect of subducting components in modifying the mantle source of island arc melts. Here, we use high-precision element concentrations in primitive phenocrystic olivine from basalts along the...
Article
Full-text available
Представлены результаты исследования состава равновесных оливина и расплава в продуктах 101 высокотемпературного (1300–1600 °С) эксперимента, проведённого при атмосферном давлении и контролируемой летучести кислорода на новой установке в ГЕОХИ РАН. Показано, что сущест- вующие модели равновесия оливин-расплав недостаточно точно описывают природные...
Article
Full-text available
We consider the composition and microstructures of pyroxene–Cr-spinel exsolution products from lherzolites of the deep mantle section of the Syum-Keu ophiolite massif in the Arctic Urals. Enstatite and diopside from the lherzolites contain lamellae and diverse micron segregations of Cr-spinel. We have first determined the composition of Cr-spinel l...
Conference Paper
Full-text available
Olivine-liquid thermometry is a powerful modelling method in the modern petrology allowing scientists to reevaluate thermic conditions of the mantle [1, 2]. Different calculation models fit better for special types of compositions or temperature values [3]. The most primitive mafic and ultra-mafic melts formed at the highest magmatic temperatures (...
Conference Paper
Full-text available
The paper presents new high-temperature vertical tube furnace for one-atmosphere experiments at V.I.Vernadsky Institute (Moscow) and its application in modern petrological studies. Described main features of the furnace and reachable temperature and oxidation conditions. Reported the first results of high-temperature experiments on melt inclusions...
Article
This study is concerned with the petrographic, mineralogic, and geochemical features in the K-high basaltic trachyandesites that were discharged by the 2012–2013 parasitic eruption on Ploskii Tolbachik Volcano. These K-high basaltic trachyandesites exhibit some obvious characteristics that testify to their suprasubduction origin. They are deeply di...
Conference Paper
Full-text available
The compositional and thermal heterogeneity of convecting mantle critically affect magma production and compositions and cannot be easily distinguished from each other. The way to resolve this ambiguity is an independent estimation of temperature and composition of mantle sources of various types of magma. Here we report application of olivine-spin...
Article
Full-text available
Unaltered Mg-olivine (Fo = 85–94) is a predominant mineral of the kimberlite block (serpentine-free) of the Udachnaya-East pipe, and it prevails in peridotite xenoliths and as inclusions in diamonds. The kimberlite of this pipe, like a series of hypabyssal kimberlites in other regions, contains two main types of olivine macrocrysts according to the...