Article
Mineralogy
Roger H. Mitchell, J. Barry Dawson
Summary: The study presents the petrological characteristics of carbonatite blocks in the Trig Point Hill flow from Kerimasi volcano, suggesting that these rocks may be primary phases rather than secondary alteration products of nyerereite.
MINERALOGICAL MAGAZINE
(2021)
Review
Multidisciplinary Sciences
Juliet Biggs, Atalay Ayele, Tobias P. Fischer, Karen Fontijn, William Hutchison, Emmanuel Kazimoto, Kathy Whaler, Tim J. Wright
Summary: New observations of volcanic and magmatic activity in Africa are reshaping our understanding of continental rifting and highlighting the associated hazards. Despite efforts to shift from crisis response to reducing disaster risks, limited capacity in sub-Saharan Africa hinders effective mitigation of geohazards.
NATURE COMMUNICATIONS
(2021)
Article
Geosciences, Multidisciplinary
Noemi Halasz, Marta Berkesi, Tivadar M. Toth, Roger H. Mitchell, Ralf Milke, Tibor Guzmics
Summary: A detailed petrographic and mineralogical investigation of olivine-phlogopite micro-ijolite xenoliths from Oldoinyo Lengai, Tanzania reveals their complex evolutionary history and diverse textural features. The xenoliths show crystallization temperatures ranging from 1070-970 degrees C to 850-700 degrees C, controlled by perovskite-titanite equilibria under plutonic pressures. The presence of double coronas and compositional zonation in the xenoliths suggests early magma chamber processes and multiple magma injections followed by cooling periods. The study provides insights into the origin and formation processes of these micro-ijolite xenoliths.
JOURNAL OF AFRICAN EARTH SCIENCES
(2023)
Article
Geochemistry & Geophysics
S. Minissale, M. Casalini, C. Cucciniello, C. Balagizi, D. Tedesco, G. Boudoire, V Morra, L. Melluso
Summary: In this study, the geochemical and isotopic variability of primitive and evolved magmas from the Nyamulagira and Nyiragongo volcanic complexes were investigated. The differences in silica undersaturation and incompatible element enrichment between the two volcanoes were remarkable. The concentration of volatile elements increased with magmatic evolution and showed distinct differences between the two volcanic complexes. The isotopic range of Sr-Nd-Pb overlapped with previous analyses in the Virunga Volcanic Province and suggested a negligible role for subducted sediments as a mantle-added geochemical component.
Article
Geosciences, Multidisciplinary
M. C. Reiss, L. De Siena, J. D. Muirhead
Summary: Understanding the magmatic plumbing system of rift volcanoes is important for examining the interaction between magma and tectonic forces. Using high-resolution tomographic imaging, this study reveals the presence of fluid-filled fracture networks and their association with carbonatite volcanism. The study also highlights the connection between volcanoes and rift segments through a central sill complex and a connected plumbing system.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Geosciences, Multidisciplinary
Lyderic France, Florian Brouillet, Sarah Lang
Summary: Carbonatites are rare C-rich alkaline magmas, with only one active system on Earth currently. Research indicates that Oldoinyo Lengai volcano had reports of carbonatites dating back to the 19th century, and recent studies suggest the presence of immiscible silicate-carbonatite melts in the volcano's reservoir as early as >11 ka.
COMPTES RENDUS GEOSCIENCE
(2021)
Article
Geochemistry & Geophysics
Celine Baudouin, Lyderic France
Summary: Trace-element partitioning between gregoryite, nyerereite, and natrocarbonatite melt is paramount for understanding trace-element distribution and fractionation in alkali-rich carbonatites. This study provides the first set of partition coefficients and lattice strain model parameters for trace-element partitioning between these carbonate minerals and natrocarbonatite at Oldoinyo Lengai (Tanzania). The results show that trace element behavior is predominantly incompatible in gregoryite and nyerereite under low-temperature and pressure conditions. Rating: 7/10
CONTRIBUTIONS TO MINERALOGY AND PETROLOGY
(2023)
Article
Geosciences, Multidisciplinary
Pierre-Yves Tournigand, Benoit Smets, Kate Laxton, Antoine Dille, Lyderic France, Gilles Chazot, Cristy Ho, Christelle Wauthier, Emma J. Nicholson, Charles Happe Kasanzu, Maruvuko Msechu, Matthieu Kervyn
Summary: This study utilizes crowd-sourced data and remote sensing data to investigate the morphological evolution and hazard assessment of the Oldoinyo Lengai volcano in Tanzania. The research reveals that the location of lava emission within the crater has shifted multiple times, and the volcano cone has experienced subsidence over time. It predicts that the crater could be filled with lava within the next decade.
JOURNAL OF VOLCANOLOGY AND GEOTHERMAL RESEARCH
(2023)
Article
Geochemistry & Geophysics
Vadim S. Kamenetsky, Anna G. Doroshkevich, Holl A. L. Elliott, Anatol N. Zaitsev
Summary: Carbonatites are unique and controversial rocks derived from mantle melts, with highly variable mineral proportions and chemical compositions influenced by multiple geological processes. They are enriched in rare elements, playing a significant role in ore deposits and the carbon cycle.
Article
Geosciences, Multidisciplinary
Alessandro Aiuppa, Federico Casetta, Massimo Coltorti, Vincenzo Stagno, Giancarlo Tamburello
Summary: The carbon concentration in the upper mantle controls melt formation and volatile outflux, with heterogeneous distribution suggesting varying extents of mantle metasomatism. The depth of melt formation in the upper mantle is positively correlated with carbon enrichment, indicating a key role of carbon in driving plate tectonics.
Article
Geochemistry & Geophysics
Anatoly N. Zaitsev, Anton R. Chakhmouradian, Charles Musiba
Summary: Hominin footprints in eastern Africa, found in Laetoli (Tanzania), Ileret (Kenya), and Melka Kunture (Ethiopia), provide valuable information on body size, anatomy, positional behavior, and locomotion biomechanics of Australopithecus afarensis, Homo erectus, and Homo heidelbergensis. The most well-known and extensively studied footprints are the 3.66-million-year-old Australopithecus afarensis tracks at Laetoli, representing the earliest record of hominin bipedalism in Africa. However, recent excavations reveal that this important paleoanthropological site is gradually disappearing due to surface diagenetic processes, highlighting the urgent need for preservation.
Article
Chemistry, Inorganic & Nuclear
Dominik Spahr, Lkhamsuren Bayarjargal, Maxim Bykov, Lukas Bruening, Tim H. Reuter, Victor Milman, Hanns-Peter Liermann, Bjoern Winkler
Summary: The inorganic pyrocarbonate salt Na-2[C2O5] has been synthesized and its crystal structure has been determined. The crystal structure is characterized by alternating layers of Na+-cations and [C2O5](2-)-complex anions.
DALTON TRANSACTIONS
(2023)
Article
Multidisciplinary Sciences
Jasper Berndt, Stephan Klemme
Summary: Carbonatites are rare igneous rocks with a global distribution, and their genesis is still a mystery. This study provides evidence that a calcium-rich carbonatite melt found in the Laacher See volcano was formed by liquid immiscibility from a phonolitic magma.
NATURE COMMUNICATIONS
(2022)
Article
Engineering, Environmental
Claudete Gindri Ramos, Marcos Leandro Silva Oliveira, Merlys Fernandez Pena, Andrea Merino Cantillo, Liliana Patricia Lozano Ayarza, Jackson Korchagin, Edson Campanhola Bortoluzzi
Summary: Nanoparticles generated from mining of volcanic rocks have raised concerns globally due to their potential risks to both the environment and human health. While these nanoparticles have opportunities for applications in filtration and transportation of metals and molecules, they have also been identified as promoters of human diseases. Therefore, there is a need to develop cleaner procedures to minimize exposure to these materials.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Geochemistry & Geophysics
Luigi Vigliotti, Dario Bilardello, Aldo Winkler, Paola Del Carlo
Summary: A detailed rock magnetic study was conducted on ash samples from different explosive activities of Mount Etna. The study found that magnetic properties can be used as effective factors for discriminating among different eruptive products. The more explosive products were characterized by oxidized Ti-rich titanomagnetites, higher coercivity distributions, and higher magnetizations and susceptibilities. Additionally, the magnetic properties of tachylite-bearing tephra provided a useful tool for studying the fragmentation process and explosive character of volcanic activities.
GEOPHYSICAL JOURNAL INTERNATIONAL
(2022)
Article
Mineralogy
Anatoly N. Zaitsev, John Spratt, Alexander G. Shtukenberg, Andrei A. Zolotarev, Sergey N. Britvin, Sergey Petrov, Alina Kuptsova, Anton Antonov
Summary: The Kerimasi volcano in northern Tanzania is composed of nephelinitic and carbonatitic pyroclastic rocks, tuffs, tuff breccias and pyroclastic breccias. The pyrochlore composition in the Loluni and Kisete craters suggest crystallisation from compositionally different carbonatitic melts. The majority of pyrochlore crystals studied exhibit well-preserved zoning patterns.
MINERALOGICAL MAGAZINE
(2021)
Article
Materials Science, Multidisciplinary
Diana O. Nekrasova, Oleg I. Siidra, Anatoly N. Zaitsev, Valery L. Ugolkov, Marie Colmont, Dmitry O. Charkin, Olivier Mentre, Ruiqi Chen, Vadim M. Kovrugin, Artem S. Borisov
Summary: The abundant anhydrous sulfate minerals in the active fumaroles of the Tolbachik volcano scoria cones were studied, resulting in the synthesis of synthetic analogs of itelmenite and glikinite minerals, showing slight deviations from their ideal stoichiometry. Analysis of Na+-ion diffusion allowed for possible scenarios of mineral formation processes to be deduced.
PHYSICS AND CHEMISTRY OF MINERALS
(2021)
Article
Geochemistry & Geophysics
S. Braunger, M. A. W. Marks, T. Wenzel, A. N. Zaitsev, G. Markl
Summary: This study investigates the genetic relationships between different rock types and focuses on the peculiar formation conditions of the extrusive agpaitic rocks at Tarosero volcano. The results suggest that the Tarosero rocks formed at redox conditions and there is no simple genetic relationship between the trachytes and other rock types. Some rock types, such as primitive basalts and intermediate latites, can be explained by high-pressure fractional crystallization.
JOURNAL OF PETROLOGY
(2021)
Article
Geochemistry & Geophysics
Sergey N. Britvin, Oleg S. Vereshchagin, Vladimir V. Shilovskikh, Maria G. Krzhizhanovskaya, Liudmila A. Gorelova, Natalia S. Vlasenko, Anna S. Pakhomova, Anatoly N. Zaitsev, Andrey A. Zolotarev, Maxim Bykov, Maksim S. Lozhkin, Fabrizio Nestola
Summary: The discovery of terrestrial allabogdanite (Fe, Ni)(2)P in the pyrometamorphic rocks surrounding the Dead Sea basin in Israel is a significant finding, indicating its metastability at ambient pressure and stability at high-pressure, high-temperature conditions. Partial substitution of Fe for Ni and Mo has been shown to significantly increase the transition pressure of allabogdanite, highlighting the influence of impurities on phase transitions in natural systems.
AMERICAN MINERALOGIST
(2021)
Editorial Material
Mineralogy
Anatoly N. Zaitsev, Anton R. Chakhmouradian, Sergey V. Krivovichev, Victor N. Yakovenchuk
MINERALOGICAL MAGAZINE
(2021)
Article
Geochemistry & Geophysics
Vadim S. Kamenetsky, Anna G. Doroshkevich, Holl A. L. Elliott, Anatol N. Zaitsev
Summary: Carbonatites are unique and controversial rocks derived from mantle melts, with highly variable mineral proportions and chemical compositions influenced by multiple geological processes. They are enriched in rare elements, playing a significant role in ore deposits and the carbon cycle.
Article
Mineralogy
Oleg Siidra, Diana O. Nekrasova, Dmitry O. Charkin, Anatoly N. Zaitsev, Artem S. Borisov, Marie Colmont, Olivier Mentre, Darya Spiridonova
Summary: The crystal structures of eight new synthetic multinary Rb-Cu sulfates have been reported, representing four new structure types, expanding the family of anhydrous copper sulfates. Some of the obtained anhydrous rubidium copper sulfates are isostructural to known compounds and new monoclinic polymorphs have been discovered. The structures reveal unique coordination environments and suggest the importance of further systematic studies in these systems to explore potentially interesting magnetic properties.
MINERALOGICAL MAGAZINE
(2021)
Article
Mineralogy
Mikhail N. Murashko, Sergey N. Britvin, Yevgeny Vapnik, Yury S. Polekhovsky, Vladimir V. Shilovskikh, Anatoly N. Zaitsev, Oleg S. Vereshchagin
Summary: Nickolayite, a new mineral, is structurally related to other minerals. It was discovered in the Daba-Siwaqa complex in Jordan, which is associated with the Hatrurim Formation. Nickolayite appears as an accessory phase in rocks and has irregularly shaped grains with a greyish-white color and metallic luster. The mineral is likely formed through co-reduction of molybdenum and phosphorus-bearing minerals during high-temperature pyrometamorphic processes.
MINERALOGICAL MAGAZINE
(2022)
Article
Geochemistry & Geophysics
Sergey N. Britvin, Mikhail N. Murashko, Yevgeny Vapnik, Anatoly N. Zaitsev, Vladimir V. Shilovskikh, Maria G. Krzhizhanovskaya, Liudmila A. Gorelova, Oleg S. Vereshchagin, Evgeny A. Vasilev, Natalia S. Vlasenko
Summary: Orishchinite is a new terrestrial phosphide discovered in Jordan, characterized by its unique mineral composition and structure.
MINERALOGY AND PETROLOGY
(2022)
Article
Geochemistry & Geophysics
Sergey N. Britvin, Natalia S. Vlasenko, Andrey Aslandukov, Alena Aslandukova, Leonid Dubrovinsky, Liudmila A. Gorelova, Maria G. Krzhizhanovskaya, Oleg S. Vereshchagin, Vladimir N. Bocharov, Yulia S. Shelukhina, Maksim S. Lozhkin, Anatoly N. Zaitsev, Fabrizio Nestola
Summary: This study reports the discovery of natural cubic perovskite in the Hatrurim Formation in the Negev Desert. The mineral contains Si and Cr substitutions, as well as oxygen vacancies. The findings suggest new ways for incorporating elements into the perovskite framework.
AMERICAN MINERALOGIST
(2022)
Article
Mineralogy
Vladimir Yu. Karpenko, Leonid A. A. Pautov, Oleg I. I. Siidra, Mirak A. A. Mirakov, Anatoly N. N. Zaitsev, Pavel Yu. Plechov, Saimudasir Makhmadsharif
Summary: A new arsenite bromide mineral, ermakovite, was discovered in the Fan-Yagnob coal deposit in Tajikistan. Ermakovite is formed from gas emitted from an underground coal fire and is associated with sulfur, realgar, and other minerals. It has tabular or prismatic hexagonal crystals.
MINERALOGICAL MAGAZINE
(2023)
Article
Geochemistry & Geophysics
Anatoly N. Zaitsev, Anton R. Chakhmouradian, Charles Musiba
Summary: Hominin footprints in eastern Africa, found in Laetoli (Tanzania), Ileret (Kenya), and Melka Kunture (Ethiopia), provide valuable information on body size, anatomy, positional behavior, and locomotion biomechanics of Australopithecus afarensis, Homo erectus, and Homo heidelbergensis. The most well-known and extensively studied footprints are the 3.66-million-year-old Australopithecus afarensis tracks at Laetoli, representing the earliest record of hominin bipedalism in Africa. However, recent excavations reveal that this important paleoanthropological site is gradually disappearing due to surface diagenetic processes, highlighting the urgent need for preservation.
Article
Geosciences, Multidisciplinary
Elena N. Perova, Anatoly N. Zaitsev, John Spratt, Nataliya S. Vlasenko, Nataliya V. Platonova, Olga G. Bubnova
Summary: The Laetoli area in northern Tanzania is an important site for paleoanthropological studies, as it contains the oldest footprints of Australopithecus afarensis. The major rock type in Laetoli is aeolian tuffs, which are divided into Lower and Upper Laetolil Beds. The Upper Laetolil Beds contain eight layers of air-fall tuffs known as marker tuffs, and it is on one of these layers, specifically marker tuff 7, that the Australopithecus afarensis footprints are found.
VESTNIK OF SAINT PETERSBURG UNIVERSITY EARTH SCIENCES
(2022)
Article
Geochemistry & Geophysics
Anatoly N. Zaitsev, Andrei A. Arzamastsev, Michael A. W. Marks, Simon Braunger, Thomas Wenzel, John Spratt, Tobias Salge, Gregor Markl
Summary: The southern part of the eastern branch of the East African Rift has been characterized by extensive volcanic activity since the late Miocene, with the Crater Highlands showing different rock compositions and formation times.
JOURNAL OF PETROLOGY
(2021)
Proceedings Paper
Biochemistry & Molecular Biology
Anatoly N. Zaitsev, Dmitry Yu Vlasov, Marina S. Zelenskaya, Olga A. Zaitseva, Olga A. Pavlova, Anton R. Chakhmouradian, Anton Savchenok, Larissa Leach, Michael Leach, Joshua Mwankunda
PROCESSES AND PHENOMENA ON THE BOUNDARY BETWEEN BIOGENIC AND ABIOGENIC NATURE
(2020)
Article
Geochemistry & Geophysics
Huichuan Liu, Alan R. Hastie, Chiara Maria Petrone
Summary: This study conducted isotope analyses on two ocean island basalt (OIB)-associated enriched mafic intrusions in the Yunnan-Burma region, and found that these rocks may have originated from the subduction recycling of marine sediments and altered oceanic crust.
Article
Geochemistry & Geophysics
L. Notini, M. Scambelluri, A. Tommasi, A. Zanetti, F. Ferri, A. Rodriguez-Vargas, E. Rampone
Summary: This study provides important petrologic information on the mantle wedge above an active subduction zone in Southern Colombia. The researchers analyzed a unique suite of rock samples and found evidence of hydration, metasomatism, and partial melting in the mantle wedge. They also observed variations in lithotypes, textures, and mineral abundance, indicating different interactions with melts and fluids. This study sheds light on the complex petrological processes occurring in the mantle wedge and contributes to our understanding of subduction zone dynamics.
Article
Geochemistry & Geophysics
Sourav Bhattacharjee, Aniket Chakrabarty, Roger H. Mitchell, Suresh Chandra Patel, Evgeniy N. Kozlov, Ekaterina N. Fomina, Monojit Dey, Supratim Pal
Summary: The Hogenakkal complex in India consists of silicate-rich and silicate-poor carbonatites and clinopyroxenites. The formation of carbonatite is influenced by silicate minerals. The carbohydrothermal mineralization in the carbonatites is induced by magma-derived fluids and interactions with the surrounding rocks.
Article
Geochemistry & Geophysics
Jia-Min Wang, Kyle Patrick Larson, Jin-Jiang Zhang, Liang Zhao, Fu-Yuan Wu
Summary: The role of collisional belts in the global carbon budget is controversial. This study reveals a previously unrecognized carbon source in the collisional orogen of the Himalayas, where metamorphism of carbonate-bearing rocks in the hanging wall resulted in significant CO2 degassing.
Article
Geochemistry & Geophysics
Joseph Martial Akame, Elson Paiva Oliveira, Vinciane Debaille, Marc Poujol, Bernhard Schulz, Dieudonnee Bisso, Fabien Humbert, Serge Parfait Koah Na Lebogo, Philmont Zo'o Zame
Summary: Archean granitoids play key roles in the crustal evolution and can provide important insights into early geologic processes.
Article
Geochemistry & Geophysics
Xiguang Huang, Jun He, Jingxin Zhao, Jingzhao Dou, Weiyong Li, Aimin Hu, Ge Liu, Yiru Ji, Fukun Chen, Shuangqing Li
Summary: This study investigates the zircon ages and whole-rock geochemical data of Late Paleozoic magmatic rocks in the Western Yunnan Tethyan belt to identify the origin and mechanism of mantle melting. The results suggest that these magmatic rocks may originate from different mantle domains that were metasomatized by slab-derived fluids and sediment-derived melts.
