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| 0016-7037/94/$6.00 + .Ml Ion microprobe studies of Efremovka CAIs: I. Magnesium isotope composition J. N. GOSWAMI...Ca-Al-rich refractory inclusions (CAB) from the Efremovka CV3 chondrite are analysed for their magnesium...of the major mineral phases (melilite, spinel, fassaite, and anorthite) in these inclusions are used to...localized in nature. The pristine nature of the Efremovka CAB, as evident from the lack of secondary alteration...magnesium isotopes between these two phases. The Efremovka data are suggestive of a relatively homogeneous |
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| SOO16-7037( 96)00054-3 Ion microprobe studies of Efremovka CAIs: II. Potassium and 41Ca in the early Solar...potassium isotope composition of refractory phases in Efremovka CAls has been measured by an ion microprobe. Extensive...with high Ca/K ratios (>3 X 105) in all the four Efremovka CAls analysed in this study. The excess 4’K in...0.14) X lo-’ at the time of formation of the Efremovka CAls. We have considered several processes that...best one from plausibility considerations. The Efremovka CAls with excess 4’K also have excess 26Mg that |
 | Vogel, Nadia, Baur, Heinrich, Bischoff, Addi, Leya, Ingo, Wieler, Rainer (2004) Noble gas studies in CAIs from CV3 chondrites: No evidence for primordial noble gases. Meteoritics & Planetary Science, 39 (5) 767-778 doi:10.1111/j.1945-5100.2004.tb00118.x | Journal (article/letter/editorial) |
| from the CV3 chondrites Allende, Axtell, and Efremovka. The 20Ne/22Ne ratios of all CAIs studied here...7 and 4.8, with fine-grained CAIs within one meteorite showing higher ratios than the coarse-grained...al. (1996) reported the Ne composition of two Efremovka CAIs to be in agreement with a trapped 20Ne/22Ne...interpreted the Ar isotopic composition of an Efremovka CAI as a mixture of cosmogenic, atmospheric, and...unequilibrated CV3 chondrites Allende, Axtell, and Efremovka. Our analytical technique is particularly suited |
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| Carbonaceous chondrites, the most primi- tive of all meteorite types, have solar-like compositions, and contain...examples of which include the unique Efremovka meteorite in the Meteorite Collection of the Russian Academy... Ca–Al-RICH INCLUSIONS IN CARBONACEOUS CHONDRITES 389 Meteorite matrix Melilite Wark–Lovering rim Fine-grained...carbonaceous chondrite and FTA CAI 33E from the Efremovka (CV3) chondrite, containing UR CAIs 3N-24 and...NWA 3118 (CV3) meteorite; (b) fluffy type A (FTA) CAI 33E from Efremovka (CV3) meteorite; (c) type B CAI |
 | Kawasaki, Noriyuki, Park, Changkun, Sakamoto, Naoya, Park, Sun Young, Kim, Hyun Na, Kuroda, Minami, Yurimoto, Hisayoshi (2019) Variations in initial 26Al/27Al ratios among fluffy Type A Ca–Al-rich inclusions from reduced CV chondrites. Earth and Planetary Science Letters, 511. 25-35 doi:10.1016/j.epsl.2019.01.026 | Journal (article/letter/editorial) |
| fluffy Type A CAIs, from the reduced CV chondrites Efremovka and Vigarano were obtained by in situ Al–Mg isotope...was distributed homogeneously in the CAI forming region. Alternatively, the observed variations in (26...heterogeneous distributions of 26 Al in the forming region. © 2019 Elsevier B.V. All rights reserved. 1....gas. FGIs in the reduced CV chondrites, such as Efremovka and Leoville, preserve * Corresponding author...homogeneously distributed throughout at least the region of the Solar System where “canonical” CAIs in CV |
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| the Allende meteorite fell in Mexico, CV3 chondrites have played a major role in meteorite studies. The...Allende quickly became the most widely studied meteorite, a title it still holds today. Initially, studies...diversity of carbonaceous asteroids and to relate meteorite and asteroid types (e.g.,Bell et al., 1989). ...Y-86751 find 200 Reduced Subgroup find Arch 990 s3 Efremovka find 21,000 s4 Leoville find 8100 s3 Vigarano...(data from McSween, 1977b). Symbols as follows: Efremovka (Efr), Leoville (Leo), Vigarano (Vig), Allende |
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| University Library on July 13, 2015 The history of meteorite age determinations J.R. D E L A E T E R Department...nucleosynthesis of elements in stars and the formation of meteorite parent bodies, to be determined. The last 40 years...evidence of clustering of exposure ages in some meteorite classes, which provide information on the frequency...systems in 'finds', compared with corresponding meteorite 'falls', give their terrestrial age on the Earth's...(eds) 2006. The History of Meteoritics and Key Meteorite Collections: Fireballs, Falls and Finds. Geological |
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| compact group of bodies and form the stable "meteorite swarm" in resonant orbit (Hughes, 1982). A small...from the recent cosmic-ray irradiation of the meteorite; the rest presumably comes from a presolar cosmic-ray...Interstellar amorphous carbon in the Murchison meteorite: Carrier of neon-E(L). Sachiko Amari,' Edward...other than the suggestion that the ice in this region is probably close to a steady state condition....movement of the ice with some ice dropping into the meteorite concentration zone of the Main Icefield. The majority |
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| l6-m.y.-old structure formed by the impact of a meteorite with the Earth. The long history of geological...ISOTOPE FRACTIONATION IN THE E2 CAI TYPE A FROM THE EFREMOVKA CV3 CHONDRITE. S. V. Afanassiev', S. G. Simakinz...type A CAI is one of the largest CAIs of the Efremovka Chondrite. The inclusion has been studied for...Zinc is exclusively located within the FeNisulfide region. This observation complicates the discussed models...SEA (GSS), EGYPT: AN INTERESTING RESERVOIR OF METEORITE FINDS. A. A. Barakatl, V. de Michele,, G. R. Levi-DonatP |
 | Tang, Haolan, Liu, Ming-Chang, McKeegan, Kevin D., Tissot, Francois L.H., Dauphas, Nicolas (2017) In situ isotopic studies of the U-depleted Allende CAI Curious Marie : Pre-accretionary alteration and the co-existence of 26 Al and 36 Cl in the early solar nebula. Geochimica et Cosmochimica Acta, 207. 1-18 doi:10.1016/j.gca.2017.03.001 | Journal (article/letter/editorial) |
| Backscattered electron images of the Curious Marie CAI. The region outlined in panel (A) is shown in greater detail...diopside, Burma spinel and a synthetic glass of fassaite composition. A precise value of 0.5160 ± 0.0034...sources for thermal processing in an early accreted meteorite parent body. Numerical simulations (Herndon and...6, it is clear that the size of this subsurface region, relative to that of the entire body, is significantly...mineralogy and chemical composition of the host meteorite. The presence of ferrous olivine in the dark inclusions |
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| if the dust (1-10 JIm) in the chondrule-forming region experienced similar conditions to chondrules (100-1000...be possible to explain rim, matrix, and bulk meteorite refractory and common lithophile compositions...extracted presolar diamonds from the Allende meteorite by the method described in [I]. The optical properties...CRYSTALLIZATION OF PYROXENE AND SPINEL IN GABBROIC LUNAR METEORITE ASUKA 881757. T. Arai, H. Takeda, and P. H. Warren...University of Tokyo, Hongo, Tokyo 113, Japan. Lunar meteorite Asuka (A)88 1757 is a distinct new type of low-Ti |
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| it, it was just at this time that the Allende meteorite fell and the minerals contained within the so-called...Silliman Chair and being curator of the Yale meteorite collection. In a continuation of Karl’s foray...chemical histories both in the solar nebula and in meteorite parent bodies. It was in CAIs that the great discovery...interstellar medium, in the solar nebula, in meteorite parent bodies, and during atmospheric entry. Each...realization in the early 1970s that there are natural meteorite concentration mechanisms at work there. There |
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| position of 56Fe; and (iv) the abundance peaks in the region past iron at the neutron closed shell positions...mixing caused by the convection, the entire unstable region evolves essentially chemically homogeneously—replenishing...of burning region (central or shell burning) and depleting the fuel elsewhere in that region at the same...burning of this fuel then commences outside that region. Table 1 summarizes the burning stages and their...maximum temperatures that have been reached in each region in the preceding hydrostatic burning stages (Table |
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| MÖSSBAUER SPECTROSCOPY OF OLIVINES FROM THE D’ORBIGNY METEORITE Y. A. Abdu1, M. E. Varela2 and F. C. Hawthorne1...structural OH bands are observed in the OH-stretching region (3800-3000 cm)1) for all samples. Mössbauer spectroscopy...(d13C approximately 0 to +5&) lining vugs in the meteorite. There are also differences in magmatic carbon...of the Meteoritical Society: Abstracts 5022 METEORITE IMPACT CRATERS IN SOUTH AMERICA: A BRIEF REVIEW...discoveries. The following possible and confirmed meteorite impact structures have been reported for this |
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| for thermal metamorphism and differentiation of meteorite parent bodies in the early solar system, that...routine! In the case of meteorites, every new meteorite was analyzed when the sample became available...of a deep-seated rock by glacier action, or a meteorite impact, or exposing a previously shielded rock...exposed on the surface due to the impact of a meteorite; (iv) cosmic ray shielded rocks exposed by glacier...exposed due to the impact of the Canyon Diablo iron meteorite (Nishiizumi et al 1991b), producing the Meteor |
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| position of 56Fe; and (iv) the abundance peaks in the region past iron at the neutron closed shell positions...mixing caused by the convection, the entire unstable region evolves essentially chemically homogeneously—replenishing...of burning region (central or shell burning) and depleting the fuel elsewhere in that region at the same...burning of this fuel then commences outside that region. Table 1 summarizes the burning stages and their...maximum temperatures that have been reached in each region in the preceding hydrostatic burning stages (Table |
