Article
Geochemistry & Geophysics
Jana Kotkova, Renata Copjakova, Radek Skoda
Summary: Orogenic peridotite in ultrahigh-pressure ultrahigh-temperature terranes provides evidence of material transfer in subduction zones, with multiphase solid inclusions (MSI) trapped in garnet offering clues to the metasomatism and melting of mantle rocks. The MSI suggest an evolution from silicic melt to carbonate-rich liquid, enriched in LILE and volatiles, during the infiltration into peridotite.
Article
Multidisciplinary Sciences
Yuri N. Palyanov, Yuri M. Borzdov, Alexander G. Sokol, Yuliya Bataleva, Igor N. Kupriyanov, Vadim N. Reutsky, Michael Wiedenbeck, Nikolay Sobolev
Summary: The study introduces a new model of diamond formation, suggesting that localized electric fields play a significant role in the process. Experimental evidence supports the effectiveness of the model under lithospheric mantle conditions.
Article
Geochemistry & Geophysics
Anton Shatskiy, Altyna Bekhtenova, Ivan Podborodnikov, Anton V. Areflev, Konstantin D. Litasov
Summary: The study reveals that potassium-rich carbonatite melts can maintain thermodynamic equilibrium with different types of olivine at high pressure and high temperature. Melts with Ca# < 30 result in wehrlitization, melts with Ca# ranging from 30 to 34 cause harzburgitization, and melts with Ca# > 34 induce wehrlitization. At a depth of about 200 km in the subcontinental lithospheric mantle, high-Mg sodium-rich dolomitic carbonatite melts are the only carbonate melts that can thermodynamically stable with garnet lherzolites.
EARTH AND PLANETARY SCIENCE LETTERS
(2022)
Review
Multidisciplinary Sciences
Bao-Hua Zhang, Xuan Guo, Takashi Yoshino, Qun-Ke Xia
Summary: Magmatic liquids, including silicate and carbonate melts, are important for mass and heat transfer in the Earth and terrestrial planets. Recent advances in experimental and theoretical studies have revealed the factors affecting the electrical conductivity of these melts. Silicate melts show strong dependence on temperature, pressure, water content, and NBO/T ratio, while carbonate melts exhibit weak dependence due to their depolymerized structure. Water content significantly affects the electrical conductivity of silicate melts but has a weaker effect on carbonate melts. Alkali element substitution decreases the electrical conductivity of carbonate melts.
NATIONAL SCIENCE REVIEW
(2021)
Article
Geosciences, Multidisciplinary
Jingyi Deng, Jiankang Li, Dehui Zhang, I-Ming Chou, Qinggao Yan, Xin Xiong
Summary: This study analyzes melt inclusions in granitic pegmatites from a world-class deposit in eastern China, demonstrating that pegmatitic melts may originate from melt-melt immiscibility in granitic magmas. This research is significant for understanding the origin and formation mechanism of pegmatite deposits.
JOURNAL OF ASIAN EARTH SCIENCES
(2022)
Article
Multidisciplinary Sciences
Charlotte L. DeVitre, Esteban Gazel, Ricardo S. Ramalho, Swetha Venugopal, Matthew Steele-MacInnis, Junlin Hua, Chelsea M. Allison, Lowell R. Moore, Juan Carlos Carracedo, Brian Monteleone
Summary: Constraining the volatile content of magmas is crucial for understanding eruptive processes and the deep Earth cycling. However, most studies on magmatic volatiles have focused on their cycling through subduction zones, while research on intraplate mafic volcanism is limited. This study analyzes melt inclusion data from Fogo volcano in Cabo Verde and suggests that oceanic intraplate silica-undersaturated explosive eruptions have volatile-rich sources.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Geochemistry & Geophysics
Fernando Tornos, John M. Hanchar, Matthew Steele-MacInnis, Elena Crespo, Vadim S. Kamenetsky, Cesar Casquet
Summary: Magnetite-(apatite) ore deposits are interpreted as being formed by the crystallization of iron-rich ultrabasic melts, dominantly generated by the interaction of silicate melts with oxidized P-F-SO4-bearing sedimentary rocks. These deposits have distinct mineralogical and geological characteristics and are significantly different from the magmatic-hydrothermal systems related to intermediate to felsic igneous rocks.
MINERALIUM DEPOSITA
(2023)
Article
Geochemistry & Geophysics
Simon Matthews, Oliver Shorttle, John Maclennan, John F. Rudge
Summary: The distribution of carbon within the Earth's mantle affects global and local carbon-trace element trends, with the C/Ba ratio in melt inclusions closely correlated with trace element enrichment. The variation in C/Ba ratios within melt inclusions from Iceland reflects similar trends observed globally, indicating a systematic influence of crustal processes and degassing on the mantle source.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2021)
Article
Multidisciplinary Sciences
Yaakov Weiss, Yael Kiro, Cornelia Class, Gisela Winckler, Jeff W. Harris, Steven L. Goldstein
Summary: This study uses U-Th-He geochronology of fluid-bearing diamonds to reveal three alteration events in the southwest Kaapvaal lithosphere, and constrains the diffusivity of helium, providing both upper and lower age limits for these events. The youngest event, occurring in the Cretaceous period, involved highly saline fluids and is related to late-Mesozoic kimberlite eruptions; while remnants of two earlier events formed by a Paleozoic silicic fluid and a Proterozoic carbonatitic fluid are also encapsulated in diamonds and likely coeval with major tectonic events.
NATURE COMMUNICATIONS
(2021)
Article
Geochemistry & Geophysics
A. Shatskiy, A. Bekhtenova, A. Arefiev, I. Podborodnikov, K. D. Litasov
Summary: Partial melting of carbonated metapelites at depth can produce two immiscible melts, which are similar to melt inclusions in diamonds. These melts react with garnet lherzolite, resulting in the formation of different minerals. These findings can help interpret the origins and mantle lithological characteristics of melt inclusions in diamonds.
Article
Multidisciplinary Sciences
Ekaterina S. Kiseeva, Nester Korolev, Iuliia Koemets, Dmitry A. Zedgenizov, Richard Unitt, Catherine McCammon, Alena Aslandukova, Saiana Khandarkhaeva, Timofey Fedotenko, Konstantin Glazyrin, Dimitrios Bessas, Georgios Aprilis, Alexandr I. Chumakov, Hiroyuki Kagi, Leonid Dubrovinsky
Summary: Ferropericlase (Mg,Fe)O is a common inclusion found in subcratonic diamonds and is the second most abundant mineral in Earth's lower mantle. This study used advanced spectroscopy and diffraction techniques to determine the iron oxidation state and structure of ferropericlase inclusions in diamonds. The results suggest that the wide range of magnesium concentrations observed in these inclusions may be due to oxidation of ferropericlase in the sublithospheric mantle.
NATURE COMMUNICATIONS
(2022)
Article
Geochemistry & Geophysics
Anton Arefiev, Anton Shatskiy, Altyna Bekhtenova, Konstantin D. Litasov
Summary: In this study, quench products of alkali-rich carbonate melts at high pressure were investigated, revealing different carbonate phases. The data suggest that these carbonates serve as markers for the pressure of their entrapment, and can be used for reconstructing the composition of carbonatitic melts entrapped by mantle minerals.
Article
Geochemistry & Geophysics
Sumith Abeykoon, Vera Laurenz, Daniel J. Frost, Nobuyoshi Miyajima, Catherine McCammon
Summary: The factors controlling the oxygen content of sulphide melts in the upper mantle were investigated using equilibration experiments with mantle peridotite assemblages. The study found that variations in sulphur/metal cation ratio and oxygen fugacity did not significantly affect the sulphide melt oxygen content. Instead, the main controls on oxygen content were the silicate FeO contents, temperature, and pressure. Nickel was found to lower the oxygen content, but its effect was difficult to separate from other variables.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2023)
Review
Geochemistry & Geophysics
A. V. Golovin, V. S. Kamenetsky
Summary: This paper provides a comprehensive review on the characteristics of melt inclusions in kimberlites of different ages and provenance. The study shows that the crystallized melt inclusions consist of various carbonate, sulfate, and chloride minerals, with similar compositions across different kimberlites. The findings suggest that the role of alkali carbonates, sulfates, and chlorides in kimberlite petrogenesis has been underestimated, while the significance of silicates and serpentine-forming components has been exaggerated.
Article
Geochemistry & Geophysics
C. Tiraboschi, C. McCammon, A. Rohrbach, S. Klemme, J. Berndt, C. Sanchez-Valle
Summary: The role of hydrous silicate melts in transferring oxidized iron in subduction zones has been confirmed by experiments. The experiments showed high concentrations of FeO in the hydrous silicate melts, indicating the dominance of oxidized iron. The results also demonstrated that hydrous silicate melts can dissolve iron oxides more efficiently than aqueous fluids, playing a crucial role in oxidizing the source of arc magma.
GEOCHEMICAL PERSPECTIVES LETTERS
(2023)
Article
Geology
Sergei Yu. Skuzovatov, Vladislav S. Shatsky, Qin Wang, Alexey L. Ragozin, Sergey I. Kostrovitsky
Summary: The discovery of zircon xenocrysts provides insights into the evolution of the buried crustal basement in the West Ukukit kimberlite field, indicating significant tectonic events in ancient times played a crucial role in shaping the region. The multiple tectonomagmatic reactivations over different periods resulted in repeated eruptions of ore bodies in the West Ukukit kimberlite field, highlighting the complex and dynamic nature of deep Earth material cycling.
INTERNATIONAL GEOLOGY REVIEW
(2022)
Article
Geochemistry & Geophysics
A. L. Ragozin, A. M. Agashev, D. A. Zedgenizov, A. A. Denisenko
Summary: This paper presents data on garnets from serpentinized peridotite xenoliths in the Nyurba and Botuoba kimberlite pipes of the Nakyn kimberlite field. The garnets are divided into two types with different REE distribution patterns, indicating two types of metasomatic agents. The geochemical characteristics of the garnets suggest a moderate reworking of lithospheric peridotites by silicate melts.
GEOCHEMISTRY INTERNATIONAL
(2021)
Editorial Material
Geochemistry & Geophysics
Felix V. Kaminsky, Dmitry A. Zedgenizov
Article
Geosciences, Multidisciplinary
Vladislav S. Shatsky, Alexey L. Ragozin, Qin Wang, Meiqian Wu
Summary: The Siberian craton, one of the largest Precambrian cratons in the world, can only provide limited geochronological data due to its coverage by younger sedimentary deposits. However, the xenoliths from various volcanic pipes and basalts in the region offer insights into the composition and evolution of the craton's crust. The available isotopic and geochemical data reveal that the Anabar tectonic province of the Siberian craton lacks age stratification, consisting of reworked Paleoarchean rocks and juvenile Proterozoic rocks at all crustal levels. Therefore, a detailed geochronological study of crustal xenoliths in the kimberlite pipes is necessary.
PRECAMBRIAN RESEARCH
(2022)
Article
Crystallography
Evgeny Vasilev, Dmitry Zedgenizov, Dmitry Zamyatin, Igor Klepikov, Anton Antonov
Summary: This study analyzed zonal and sectorial heterogeneities in natural diamonds using CL microscopy, revealing that the relative brightness of growth sectors depends on the nature of defects and imaging methods. The differences between SS-CL and SEM-CL images are attributed to luminescence kinetics and detector sensitivity. Additionally, it was found that hydrogen atoms around lattice defects in diamonds can impact defect transformation kinetics.
Article
Materials Science, Multidisciplinary
Mariana I. Rakhmanova, Andrey Yu. Komarovskikh, Alexey L. Ragozin, Olga P. Yuryeva, Vladimir A. Nadolinny
Summary: The behavior of characteristic centers in diamond crystals from the Mir pipe (Yakutia) was investigated upon electron irradiation. Different types of diamond crystals were studied based on their nitrogen content and aggregation parameters. The presence of specific photoluminescence systems at different wavelengths suggests the interaction between defects and impurities. Annealing of the irradiated crystals provided insights into the nature of the defects.
DIAMOND AND RELATED MATERIALS
(2022)
Article
Geochemistry & Geophysics
Felix Kaminsky, Dmitry A. Zedgenizov
Summary: This article introduces the discovery of Merrillite minerals in lower-mantle diamonds from the Rio Soriso area in Brazil, marking the first report of Merrillite in a terrestrial environment. The find of Merrillite suggests a larger variety of mineral species in the lower mantle.
AMERICAN MINERALOGIST
(2022)
Article
Geosciences, Multidisciplinary
Sergei Skuzovatov, Vladislav S. Shatsky, Alexey L. Ragozin, Alexander P. Smelov
Summary: This study provides detailed analyses of detrital garnets from diamond-rich Late Triassic sedimentary rocks in northeastern Siberia, revealing the characteristics and potential of the mantle beneath the northeastern Siberian craton. The results are valuable for understanding the mechanisms of diamond formation and preservation.
GEOSCIENCE FRONTIERS
(2022)
Article
Multidisciplinary Sciences
Ekaterina S. Kiseeva, Nester Korolev, Iuliia Koemets, Dmitry A. Zedgenizov, Richard Unitt, Catherine McCammon, Alena Aslandukova, Saiana Khandarkhaeva, Timofey Fedotenko, Konstantin Glazyrin, Dimitrios Bessas, Georgios Aprilis, Alexandr I. Chumakov, Hiroyuki Kagi, Leonid Dubrovinsky
Summary: Ferropericlase (Mg,Fe)O is a common inclusion found in subcratonic diamonds and is the second most abundant mineral in Earth's lower mantle. This study used advanced spectroscopy and diffraction techniques to determine the iron oxidation state and structure of ferropericlase inclusions in diamonds. The results suggest that the wide range of magnesium concentrations observed in these inclusions may be due to oxidation of ferropericlase in the sublithospheric mantle.
NATURE COMMUNICATIONS
(2022)
Article
Geochemistry & Geophysics
Nikolai V. Gubanov, Dmitry A. Zedgenizov
Summary: A suite of coated diamonds from the International'naya and Mir kimberlite pipes were studied to track the most recent metasomatic events in the sub-continental lithospheric mantle (SCLM). The diamonds consist of an older monocrystalline core and a younger fibrous coat. Microinclusions in the coats indicate two types of growth media: dominant silicic to low-Mg carbonatitic high-density fluids (HDFs) and minor high-Mg carbonatitic HDFs. The chemistry of the high-Mg carbonatitic HDFs suggests that they originated from partial melting of a carbonated peridotite.
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2023)
Article
Geosciences, Multidisciplinary
O. A. Ivanova, N. P. Pokhilenko, V. P. Afanasiev, D. A. Zedgenizov, E. O. Barabash
Summary: The diamonds from Snap Lake kimberlites, classified as types I and IV according to Yu.L. Orlov's classification, were investigated. The study of their morphology, defect-impurity profile, and internal structure revealed that the uncoated crystals and cores of coated diamonds formed under similar conditions. It was found that the coats appeared on a significant portion of diamonds formed under mantle conditions and were etched during the hypogenic stage of the kimberlite body.
DOKLADY EARTH SCIENCES
(2023)
Article
Multidisciplinary Sciences
Suzette Timmerman, Thomas Stachel, Janne M. Koornneef, Karen V. Smit, Rikke Harlou, Geoff M. Nowell, Andrew R. Thomson, Simon C. Kohn, Joshua H. F. L. Davies, Gareth R. Davies, Mandy Y. Krebs, Qiwei Zhang, Sarah E. M. Milne, Jeffrey W. Harris, Felix Kaminsky, Dmitry Zedgenizov, Galina Bulanova, Chris B. Smith, Izaac Cabral Neto, Francisco V. Silveira, Antony D. Burnham, Fabrizio Nestola, Steven B. Shirey, Michael J. Walter, Andrew Steele, D. Graham Pearson
Summary: The sublithospheric diamonds from Brazil and Guinea, with ages ranging from 450 to 650 million years ago, were formed in a subduction system near Gondwana. These diamonds were preserved beneath Gondwana for over 300 million years and might have enhanced supercontinent stability by attaching to the lithospheric keel.
Article
Geochemistry & Geophysics
Felix V. Kaminsky, Dmitry A. Zedgenizov, Vyacheslav S. Sevastyanov, Olga V. Kuznetsova
Summary: Diamonds from the Rio Sorriso placer in Brazil contain ferropericlase mineral inclusions with different genetic and compositional groups, indicating their origins from the mantle and lithosphere. The difference in carbon isotopic compositions of the diamonds suggests stratification of carbon isotopes in the mantle.
Article
Geosciences, Multidisciplinary
V. S. Shatsky, A. L. Ragozin, Q. Wang, W. Su, A. A. Ilyin, M. V. Kolesnichenko
Summary: Study of xenoliths of crustal rocks from the Novinka kimberlite pipe reveals the composition of pyroxene and garnet-pyroxene crystal schists and garnet-pyroxene gneisses in different levels of the crust. The mineral assemblages of crystal schists suggest their formation under cooling conditions with constant pressure, while the presence of sodalite indicates the presence of highly saline brines during the final stages of rock cooling. The U-Pb age of zircons indicates a tectono-thermal event during the Neoarchean period. These findings provide insights into the crustal heterogeneity of the Yakutsk diamondiferous province.
DOKLADY EARTH SCIENCES
(2022)
Article
Geosciences, Multidisciplinary
V. S. Shatsky, A. L. Ragozin, S. Yu Skuzovatov, O. A. Kozmenko, E. Yagoutz
Summary: The isotope-geochemical features of diamondiferous metamorphic rocks in the Kokchetav subduction-collision zone suggest a link to basement rocks and sediments of the Kokchetav massif dating back to over 1.1 billion years ago. Additionally, high-alumina diamondiferous rocks in the Barchi area underwent partial melting around 507 million years ago, indicating a crustal source for these sediments.
RUSSIAN GEOLOGY AND GEOPHYSICS
(2021)
