A5049172834- Astro and Planetary Science
- Planetary Science and Exploration
- High-pressure geophysics and materials
- Geological and Geochemical Analysis
- Isotope Analysis in Ecology
- Particle physics theoretical and experimental studies
- Nuclear Physics and Applications
- Dark Matter and Cosmic Phenomena
- Marine and environmental studies
- Stellar, planetary, and galactic studies
- Spacecraft and Cryogenic Technologies
- Geology and Paleoclimatology Research
- Astronomical and nuclear sciences
- Astrophysics and Cosmic Phenomena
- Geochemistry and Geologic Mapping
- Geomagnetism and Paleomagnetism Studies
- Quantum Chromodynamics and Particle Interactions
- Paleontology and Stratigraphy of Fossils
- Mineralogy and Gemology Studies
- Crystal Structures and Properties
- Neutrino Physics Research
- High-Energy Particle Collisions Research
- earthquake and tectonic studies
- Methane Hydrates and Related Phenomena
- Astrophysics and Star Formation Studies
V.I. Vernadsky Institute of Geochemistry and Analytical Chemistry
2015-2024
Irkutsk National Research Technical University
2024
Russian Academy of Sciences
2013-2024
Nanjing University of Information Science and Technology
2022
North-Eastern Federal University
2019
All-Russian Research Institute for Fire Protection
2018
North-Western State Medical University named after I.I. Mechnikov
2018
National Museum of Natural History
2002-2016
Smithsonian Institution
2002-2016
University of Tennessee at Knoxville
2003
Transient heating events that formed calcium-aluminum-rich inclusions (CAIs) and chondrules are fundamental processes in the evolution of solar protoplanetary disk, but their chronology is not understood. Using U-corrected Pb-Pb dating, we determined absolute ages individual CAIs from primitive meteorites. define a brief formation interval corresponding to an age 4567.30 ± 0.16 million years (My), whereas chondrule range 4567.32 0.42 4564.71 0.30 My. These data refute long-held view gap...
With a half-life of 0.73 Myr, the 26Al-to-26Mg decay system is most widely used short-lived chronometer for understanding formation and earliest evolution solar protoplanetary disk. However, validity 26Al–26Mg ages meteorites their components relies on critical assumption that canonical 26Al/27Al ratio ∼5 × 10−5 recorded by oldest dated solids, calcium–aluminium-rich inclusions (CAIs), represents initial abundance 26Al as whole. Here, we report high-precision Mg-isotope measurements inner...
Abstract— Radiochronometry of L chondritic meteorites yields a rough age estimate for major collision in the asteroid belt about 500 Myr ago. Fossil from Sweden indicate highly increased influx extraterrestrial matter Middle Ordovician ∼480 An association with L‐chondrite parent body event was suggested, but definite link is precluded by lack more precise radiometric ages. Suggested ages range between 450 ± 30 and 520 60 Myr, can neither convincingly prove single breakup event, nor constrain...
Abstract— Dhofar 019 is a new martian meteorite found in the desert of Oman. In texture, mineralogy, and major trace element chemistry, this classified as basaltic shergottite. Olivine megacrysts are set within groundmass composed finer grained olivine, pyroxene (pigeonite augite), maskelynite. Minor phases chromite‐ulvöspinel, ilmenite, silica, K‐rich feldspar, merrillite, chlorapatite, pyrrhotite. Secondary terrestrial origin include calcite, gypsum, celestite, Fe hydroxides, smectite....
Abstract— Isheyevo is a metal‐rich carbonaceous chondrite that contains several lithologies with different abundances of Fe,Ni metal (7–90 vol%). The 50–60 vol% are dominant. and metal‐poor most similar to the CB b CH chondrites, respectively, providing potential link between these groups. All experienced shock metamorphism stage S4. consist components—Fe,Ni metal, chondrules, refractory inclusions (Ca, Al‐rich [CAIs] amoeboid olivine aggregates [AOAs]), heavily hydrated lithic clasts—but...
Abstract Bulk isotopic and elemental compositions of CV CK chondrites have led to the suggestion that both originate from same asteroid. It has been argued magnetite also support this model; however, studied almost exclusively in equilibrated (type 4‐6) s. Magnetite seven unequilibrated s analyzed here is enriched MgO, TiO 2 , Al O 3 relative s, suggesting are affected by metamorphism. compositionally distinct particularly abundances Cr NiO, . Although there minor similarities between...
Beryllium-10 is a short-lived radionuclide (t1/2 = 1.4 Myr) uniquely synthesized by spallation reactions and inferred to have been present when the solar system's oldest solids (calcium–aluminum-rich inclusions, CAIs) formed. Yet, astrophysical site of 10Be nucleosynthesis uncertain. We report Li–Be–B isotope measurements CAIs from CV chondrites, including that formed with canonical 26Al/27Al ratio ∼5 × 10−5 (canonical Fractionation Unidentified Nuclear effects (FUN-CAIs) characterized...
Dmitryivanovite (CaAl2O4) is a newly described, calcium aluminum oxide from the Northwest Africa 470 (NWA470) CH3 chondrite (Ivanova et al. 2002). NWA470 contains abundant small Ca,Alrich inclusions (CAIs), and dmitryivanovite, whose composition close to stoichiometric CaAl2O4 [Ca1.000(Al1.993Si0.003Ti0.002)1.998O4], was found in one of these CAIs. It occurs as ~10 μm subhedral grains intergrown with grossite (CaAl4O7), perovskite, melilite. Electron backscatter diffraction (EBSD) analysis...
Abstract We investigated the khatyrkite–cupalite holotype sample, 1.2 × 0.5 mm across. It consists of khatyrkite (Cu,Zn)Al 2 , cupalite (Cu,Zn)Al, and interstitial material with approximate composition (Zn,Cu)Al 3 . All mineral phases sample contain Zn lack Fe that distinguishes them from in Khatyrka meteorite particles (Bindi et al. ; MacPherson Hollister ). Neither highly fractionated natural systems nor geo‐ or cosmochemical processes capable forming are known so far. The bulk chemistry...
Abstract– Two compound calcium‐aluminum‐rich inclusions (CAIs), 3N from the oxidized CV chondrite Northwest Africa (NWA) 3118 and 33E reduced Efremovka, contain ultrarefractory (UR) inclusions. is a forsterite‐bearing type B (FoB) CAI that encloses UR inclusion 3N‐24 composed of Zr,Sc,Y‐rich oxides, Y‐rich perovskite, Zr,Sc‐rich Al,Ti‐diopside. contains fluffy A (FTA) 33E‐1 , surrounded by Wark‐Lovering rim layers spinel, Al‐diopside, forsterite, common forsterite‐rich accretionary rim....
Abstract– Dhofar (Dho) 225 and Dho 735 are carbonaceous chondrites found in a hot desert having affinities to Belgica‐like Antarctic (Belgica [B‐] 7904 Yamato [Y‐] 86720). Texturally they resemble CM2 chondrites, but differ mineralogy, bulk chemistry oxygen isotopic compositions. The texture main mineralogy of similar the unlike do not contain any (P, Cr)‐sulfides, nor tochilinite 6Fe 0.9 S*5(Fe,Mg)(OH) 2 . H O‐contents (1.76 1.06 wt%) lower than those (2–18 wt%), metamorphosed group. Bulk...
Abstract— –The CH/CB‐like chondrite Isheyevo consists of metal‐rich (70–90 vol% Fe,Ni‐metal) and metal‐poor (7–20 lithologies which differ in size relative abundance Fe,Ni‐metal chondrules, as well proportions porphyritic versus non‐porphyritic chondrules. Here, we describe the mineralogy petrography Ca,Al‐rich inclusions (CAIs) amoeboid olivine aggregates (AOAs) these lithologies. Based on mineralogy, refractory can be divided into hibonite‐rich (39%), grossite‐rich (16%), melilite‐rich...
Abstract We studied three lithologies (light and dark chondritic impact melt rock) differing in shock stage from the LL 5 chondrite Chelyabinsk. Using 40 Ar‐ 39 Ar dating technique, we identified low‐ high‐temperature reservoirs within all samples, ascribed to K‐bearing oligoclase feldspar shock‐induced jadeite–feldspar glass assemblages veins, respectively. Trapped argon components had variable Ar/ 36 ratios even of individual samples. Correcting for trapped revealed a lithology‐specific...