This photograph shows the meteor trail near Chelyabinsk, Russia on Feb. 15, 2013 at about 9:21 a.m. local time, ... if the circumstances of an object's composition and trajectory permit." EL), and R and K chondrites. The, largest troilite grains contain small round inclusions of, 14), they are represented by ironrich pentlandite. Publ. Grains of intermetallic compounds, are characterized by a zoned structure: a kamasite, growths with a size up to 0.3 mm formed by a polygo, nal–granular aggregate, as well as rims o, intermetallic compounds, and participates in all types, troilite is characterized by a constant chemical com, position independently of association. Dr Borovicka explained that the videos were chosen based on the angles they were filmed and then calibrated for clarity with the help of an engineer. The results suggest that postshock thermal effects observed at each experiment may be attained by impact on the natural targets at a considerably lower shock pressure than the peak shock pressure. History. Clinopyroxene is xenomorphic in relation to olivine, and enstatite grains and is often observed in the matrix, as individual grains in the orthopyroxene aggregate. novskii, in Magmatism and metamorphism in the Earth [20], In the aftermath of the superbolide air burst, a large number of small meteorite fragments fell on areas west of Chelyabinsk, including Deputatskoye, generally at terminal velocity, about the speed of a piece of gravel dropped from a skyscraper. London, 535 (1988). accretion of metallic cores from disrupted asteroids. The second sample of black chon, drite had a slightly different chemical composition. Credit: Victor Sharygin. It has been found that that the meteorite’s matter is composed of olivine (chrysolite), In detail, minor differences in element ratios correlate with the istopic characteristics of different types of OIB components (HIMU, EM, MORB). © Pleiades Publishing, L. i, iron and nickel intermetallic compounds. Interstitials between oliv, ine grains in gray chondrite are mainly filled by plagio, clase, whereas in black chondrite they are filled only, by feldspar glass. [4][5] The resulting fragments were scattered over a wide area. The melts contain much larger vesicles (50–300 μm in diameter) than those in the samples shocked at lower pressures, which indicates that much more intense devolatilization and gas expansion took place.For the purpose of comparing shock thermal effects between the experimentally shocked samples and naturally shocked targets (surface materials in the Murchison parent body), we calculated internal energy increase for compression by multiple shock wave reflections (experimental case) and for compression by a single shock wave (natural case). [11] Meteorite fragments of the body landed on the ground. Access scientific knowledge from anywhere. Some groups are subdivided into subgroups, which may have resulted from Jorge Zuluaga of the University of Antioquia in Colombia, who traced the Chelyabinsk meteor to the Apollo asteroid family, cautions that 2011 EO40 has yet to be confirmed as the parent. Quench zones occur along contacts of, veins; they are characterized by a regular decrease in, Chemical composition of chromite (wt %) from the meteorite, sizes of both olivine grains and droplike troilite segre, gations. It was caused by an approximately 20 m (66 ft) near-Earth asteroid with a speed relative to Earth of 19.16 ± 0.15 kilometres per second (60,000 –69,000 km/h or 40,000 –42,900 mph). Searching for pure iron in nature: The Chelyabinsk meteorite, The Kargapole meteorite: New data on mineralogy, The Ozernoye Meteorite: New Data on Mineralogy, Crystalline and Amorphous Matter in the Chelyabinsk Meteorite: Evidence from Raman Spectroscopy, Formation and deformation of Phosphorus-Olivine-Assemblages in the Chelyabinsk chondrite, The variations of chemical composition and features of the distribution of rare elements in chondrites of fragments of the Chelyabinsk meteorite, Mineral Composition and Structure of the Sverdlovsk Meteorite (H4-5), The Kunashak meteorite: New data on mineralogy, The Substance of the Chelyabinsk Meteorite: Results of Geochemical and Thermomagnetic Studies, Chemical and isotopic systematics of oceanic basalts: Implications for mantle composition and processes, Systematics and Evaluation of Meteorite Classification, Disequilibrium melting and melt migration driven by impacts: Implications for rapid planetesimal core formation, Experimental shock metamorphism of the Murchison CM carbonaceous chondrite, Platinum-group element mineralization of zoned-type massifs from Middle Urals (Russia) / Платинометальное оруденение зональных массивов Среднего Урала: состав, источники вещества, условия образования, Ru-Os-Ir alloys and sulfides from Late Archaean placer deposits of the Witwatersrand Basin: composition, isotope systematics, origin, PGE-bearing ultramafic massifs of Eurasia: New insights on the age and origin, Timing and isotope systematics of ultramafic-mafic intrusions and Ni-Cu-PGE sulfide deposits from Polar Siberia: Genetic constraints and implications for exploration. Roy. BSE image of black chondrite from Chelyabinsk meteorite intruded by veins of two generations: network of thin sulfide veins (Veins 1) and thick veins composed of glass, olivine, and troilite (Vein 2) (SEM JSMM6390LV, Institute of Geology and Geochemistry, Ural Branch, Russian Academy of Sciences, analyst S.P. This rule works in general and suggests that the overall fractionation processes operating during magma generation and evolution are relatively simple, involving no significant change in the environment of formation for MORBs and OIBs. Results. Further tests would be needed to confirm if 2011 EO40 was Chelyabinsk’s parent rock. This minor event appears to have generated a sub-population of phosphates that display patchy CL textures, in both the light and dark lithology. Meeting (Yekaterinburg, Field-emission SEM, electron back-scatter diffraction (EBSD) and electron microprobe were used to characterize its composition and structure and associated phases. A series of shock-recovery experiments were carried out on the Murchison CM carbonaceous chondrite by using a single-stage propellant gun. This page was last edited on 26 January 2021, at 18:05. Empty squares and triangles denote. The solar abundances and the Hence, the content of magnetite is much below 0.1. At ∼20 GPa, subparallel fractures begin to form in the matrix in directions roughly perpendicular to the compression axis and their densities increase with pressure, especially dramatically at 25 to 30 GPa; thus, the sample is increasingly comminuted and becomes fragile.Local shock melting occurs as melt veins and pockets at 20 to 30 GPa. Months after a 62-foot-wide fireball streaked through the morning sky over Chelyabinsk, Russia, scientists are starting to get a handle on the rock's composition, trajectory and impact. [11] At an altitude of about 23.3 km (14.5 miles) the body exploded in an air burst. [12], Size comparison of the meteoroid to a Boeing 747, among some other objects. There are 15 chondrite groups, including 8 carbonaceous More recently, in 2013 the world was startled by a brilliant fireball that streaked across the sky above Chelyabinsk, Russia. Many thousand people observed the, explosion within the Middle and South Urals and, North Kazakhstan.
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