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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 |
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| to possible decay of extinct 36Cl in the Efremovka meteorite. Trapped 22Ne in the range of (1.4 –2.5)... 4436 V. K. Rai , S. V. S. Murty, and U. Ott graphite is virtually free of trapped gases (Göbel et...that diamond was produced by shock conversion of graphite (Lipschutz, 1964; Anders and Lipschutz, 1966;...whether diamond is produced by shock conversion of graphite or condensed directly from the solar nebula, there...indicates that the sample has been analyzed. Meteorite (Abbreviation)† Type Haverö (Hav) Monomict |
 | 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...22Ne-rich component Ne-G or Ne-R (carried by presolar graphite and presolar SiC; see Ott 2002). Furthermore,...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 |
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| to the minimally thermally metamorphized CO3 meteorite ALHA 77307. With increasing metamorphic grade...onion-shell model of structure and cooling history of meteorite parent bodies where the temperature increases...presence of 127I in nanodiamonds of the Efremovka meteorite (Holland et al., 2003) and the increase of...coarse-grained diamond fraction ED-12 of the Efremovka CV3 meteorite is about 20 Ma (Holland et al., 2003)....from the Efremovka CV3 meteorite took place about 20 Ma after the I–Xe closure for the meteorite Shallowater |
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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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| the Pv-ehde preprint MS#4506 Orion star-forming region (Bloemen et al., 1994) has been used as evidence...lines from I2C and 1 6 0 in the Orion star-forming region could not be substantiated (Bloemen et al., 1999)...calcium-aluminum-rich inclusion (CAI) from the Efremovka meteorite by Marhas and Goswami (2000) did not reveal...in 1OB in melilites in CAIs from Allende and Efremovka characterized by low B content (less than a few...pers. comm., 1996), the matrix of the Orgueil CI meteorite (0.78 pprn B and 611B = -3.9 2 0.1%0;Zhai ef al |
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| l6-m.y.-old structure formed by the impact of a meteorite with the Earth. The long history of geological...highly birefringent. The residue also contains graphite, which occurs as discrete thin sheets and as coatings...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...continued our efforts to characterize low-density graphite grains from Murchison separate KE3 (1.65-1.72 |
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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...lIth, 1697-1712. CALCIUM·41 IN CIRCUMSTELLAR GRAPHITE FROM SUPER· NOVAE. S. Amartt-s, E. Zinner', and...Ca, and Ti in 13 C grains from the low-density graphite fraction KE3 (1.65-1.72 g/cmt). These grains show...been proposed as stellar sources of low-density graphite grains [1-3]. Grain KE3c-551 (14 pm in size) has |
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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...possible and showed that presolar silicon carbide and graphite grains have 12C/13C and 14N/15N ratios that span |
 | Ouellette, N., Desch, S.J., Bizzarro, M., Boss, A.P., Ciesla, F., Meyer, B. (2009) Injection mechanisms of short-lived radionuclides and their homogenization. Geochimica et Cosmochimica Acta, 73 (17) 4946-4962 doi:10.1016/j.gca.2008.10.044 | Journal (article/letter/editorial) |
| calcium-aluminum-rich inclusion (CAI) from the Allende meteorite by McKeegan et al. (2000). Following this discovery...also been found in hibonites from the Murchison meteorite, at levels that are consistent with the initial...demonstrates that 26Al was present in the accretion region of terrestrial planets and planetesimals at levels...detailed K isotope study of CAIs from the Efremovka meteorite that defined an initial 41Ca abundance of...association between an AGB star and a star-forming region will be coincidental, and not a necessary consequence |
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| branching of the s-process path in the 184 F A F 188 region may be responsible for a departure from the steady-flow...high that the material is pushed deep inside the region of very neutron-rich b-unstable nuclei. If the...refractory materials of various types Ždiamond, SiC, graphite, corrundum, silicon nitride.. Tiny subgrains,...Mo-carbide or TiC subgrains, have even been found in graphite or SiC grains, respectively Žsee Bernatowicz and...of 26Al observed in presolar silicon carbide, graphite, and oxide grains, as demonstrated in Fig. 14 |
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| interstellar grains of diamond, silicon, carbide and graphite found in meteorites to attempt a better under¬...identification of diamond, silicon carbide and graphite grains in samples of primitive meteorites. Isotopic...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 |
 | Defouilloy, C., Cartigny, P., Assayag, N., Moynier, F., Barrat, J.-A. (2016) High-precision sulfur isotope composition of enstatite meteorites and implications of the formation and evolution of their parent bodies. Geochimica et Cosmochimica Acta, 172. 393-409 doi:10.1016/j.gca.2015.10.009 | Journal (article/letter/editorial) |
| features that distinguish them from any other meteorite groups. They have a distinct mineralogy, with...and 2 for the aubrites (one for the Shallowater meteorite, and another parent body for all the other aubrites)...from two museums) that were analyzed from this meteorite (d34S = 1.350‰ vs. d34S = +0.215‰). This difference...First analyses on undiscriminated powder from the meteorite gave a bulk composition of d34S = 0.517 ± 0.06‰...reproducible between different replicates of a same meteorite with a difference of less than 0.2‰ in d34S, with |
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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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| 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...grain did not show any lines of crystalline C (graphite, diamond), indicating that it is amorphous. A...beam and could not be measured. Since crystalline graphite is stable under the beam, Ca I, too, seems to |
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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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| this is the first record of formaldehyde in a meteorite. [So] it now appears that such prebiological materials...Portugal) and colleagues accounted SOLAR SYSTEM Meteorite Evidence: Earth Was Born with Its Water ASTRONOMERS...analyz- ¢ MONICA YOUNG ing the Efremovka meteorite found in Kazakhstan in 1962. It contains several c...team found that the minerals trapped within the meteorite had two distinct D/H ratios. Some components had...the large quantities of dust that obscure this region in visible light, radio waves reveal a scene teeming |
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| Science Tunis, Tunisia, 4 Meteorite Laboratory Lehmweg Gifhorn, Germany, 5 Meteorite Recon Mühlendamm Hamburg...calculation of meteorite flux is possible [4]. Following previous estimation of meteorite flux based on...geographical and morpho-structural district located in NW Argentina. This region is characterized by an extremely...structures in the alluvial fan, or the result of a meteorite shower. Their age, whatever the event is, is very...ANALYSIS (INAA) FOR ELEMENTAL COMPOSITION OF FRESH METEORITE FALL IN ORISSA, INDIA (2003). B. Adur, H.B. Mali |
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| .... 83 Gases in presolar silicon carbide and graphite .................................................. 149 Exposure ages and dynamical models of meteorite delivery .......................................first discovered 129Xe excesses in the Richardton meteorite, then wrote that astonishing paper entitled “The...first discovered 129Xe excesses in the Richardton meteorite, then wrote that astonishing paper entitled “The...sector mass spectrometer (Clarke et al. 1969). Meteorite research has made particular demands upon noble |
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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 |
