 | | Journal (article/letter/editorial) | | 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 |  | | Journal (article/letter/editorial) | | Carbonaceous chondrites, the most primi- tive of all meteorite types, have solar-like compositions, and contain...chondrites are known to contain presolar grains of hibonite and spinel with non-solar oxygen isotope compositions...examples of which include the unique Efremovka meteorite in the Meteorite Collection of the Russian Academy...crystals with included smaller crystals of spinel, hibonite, and sometimes perovskite. Fine-grained secondary...forsterite. The remaining minerals, including hibonite, grossite, dmitrivanovite (or krotite), perovskite |  | | Journal (article/letter/editorial) | | 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...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...less abundant. The refractory inclu~ons in the Efremovka CV3 chondrite are, however, an exception in this |  | | Report (issue) | | μm (Vigarano), 1-8 μm (Allende), and 1-20 μm (Efremovka). Physical Properties: Cleavage: n.d. Fracture:...Luster: n.d. Z=8 X-ray Powder Pattern: Allende meteorite. 2.725 (100), 1.629 (80), 3.047 (55), 2.488 (50)...80 0.79 0.61 0.53 0.07 0.05 98.38 (1) Allende meteorite; average electron microprobe analysis, Ti3+ and...04Zr0.03) (Si2.38Al0.38Ti4+0.24)O12. (2) Efremovka meteorite; analysis not given; corresponds to (Ca2...01Fe0.01)(Si2.36Al0.48Ti4+0.16)O12. (3) Vigarano meteorite; analysis not given; corresponds to (Ca1.89Y0 |  | | Journal (article/letter/editorial) | | calcium-aluminum-rich inclusions from the reduced CV3 chondrite Efremovka ALEXANDER N. KROTI*, ALEXANDER A. ULYANOV1,2,...type B CAI (E48) from the reduced CV3 chondrite Efremovka, which is less altered than Allende. In contrast...contrast to the Allende accretionary rims, those in Efremovka consist of coarse-grained ( 2 0 4 0 ym), anhedral...AOAs and host CAIs are virtually unaltered, a hibonite-spinelperovskite CAI in the E48 accretionary rim...accretionary rims. We infer that accretionary rims in Efremovka are more primitive than those in Allende and formed |  | Ivanova, Marina A., Petaev, Michail I., Macpherson, Glenn J., Nazarov, Michail A., Taylor, Lawrence A., Wood, John A. (2002) The first known natural occurrence of calcium monoaluminate, in a calcium-aluminum-rich inclusion from the CH chondrite Northwest Africa 470. Meteoritics & Planetary Science, 37 (10) 1337-1344 doi:10.1111/j.1945-5100.2002.tb01032.x | Journal (article/letter/editorial) | | the time of formation (Srinivasan et al., 1994). Hibonite-bearing CAIs therefore are believed to The system...calculations (e.g., compare the results of Yoneda Both hibonite (CaAlI2Ol9)and grossite (CaA1407) were and Grossman...describe review by Brearley and Jones, 1998). Hibonite is predicted by the first natural occurrence of...Ivanova et al. (200 1c). and Grossman, 2000). Hibonite in CAIs commonly contains clear evidence, in the...Vernadsky 1995, and numerous references therein). Some hibonite has Institute, was studied by optical microscopy |  | 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...aluminous diopside, and more rarely perovskite and hibonite (Krot et al., 2004), however, in FGIs from oxidized |  | | Journal (article/letter/editorial) | | 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 |  | 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 |  | Nakashima, Daisuke, Ott, Ulrich, Hoppe, Peter, El Goresy, Ahmed (2008) Search for extinct 36Cl: Vigarano CAIs, the Pink Angel from Allende, and a Ningqiang chondrule. Geochimica et Cosmochimica Acta, 72 (24) 6141-6153 doi:10.1016/j.gca.2008.10.001 | Journal (article/letter/editorial) | | alteration occurred in the solar nebula or on the meteorite parent body (Brearley, 2003). Radioactive 36Cl...overabundances in bulk noble gas measurements of the Efremovka CV3 chondrite, and inferred a 36Cl/35Cl ratio...sections from the Vigarano meteorite and a thin section from the Ningqiang meteorite were prepared. Two thin...and 36S, the dynamic background in the 36 S mass region, and 37Cl were measured in a combined peak jumping...second step the dynamic background in the 36S mass region was re- 36 Cl 6143 corded by changing the deflection |  | | Book | | 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 |  | | Journal (article/letter/editorial) | | if the dust (1-10 JIm) in the chondrule-forming region experienced similar conditions to chondrules (100-1000...explaining some of the fine-grained corundum and hibonite found in the CAl-poor OCs. If some ofthis dust...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 |  | 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) | | the Curious Marie CAI (and that of a Madagascar hibonite standard used for normalization), the signals...determined to be 1.39 ± 0.04 based on the Madagascar hibonite (27Al/24Mg = 42.7 ± 0.7; measured by UCLA JEOL...Backscattered electron images of the Curious Marie CAI. The region outlined in panel (A) is shown in greater detail...systematics Terrestrial standards Madagascar hibonite #1 #2 #3 #4 Al/24Mg Weighted Average Average...sources for thermal processing in an early accreted meteorite parent body. Numerical simulations (Herndon and |  | | Book | | 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 |  | | Journal (article/letter/editorial) | | 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 |  | 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...initial value of 10Be/9Be = (5.1 ± 1.4) 104 in a hibonite that did not initially contain measurable 26Al...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 |  | | Journal (article/letter/editorial) | | contain spinel, Co (Alexander et al., 1989b), hibonite, corundum, titanium oxide and zircon. In Murchison...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. |  | | Journal (article/letter/editorial) | | 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 |  | HERZOG, Gregory F., CAFFEE, Marc W., FAESTERMANN, Thomas, HERTENBERGER, R., KORSCHINEK, Gunther, LEYA, Ingo, REEDY, Robert C., SISTERSON, J. M. (2011) Cross sections from 5 to 35 MeV for the reactions natMg(3He,x)26Al, 27Al(3He,x)26Al, natCa(3He,x)41Ca, and natCa(3He,x)36Cl: Implications for early irradiation in the solar system. Meteoritics & Planetary Science, 46 (10) 1427-1446 doi:10.1111/j.1945-5100.2011.01236.x | Journal (article/letter/editorial) | | natCa(3He,x)41Ca, and natCa(3He,x)36Cl in the energy region from approximately 5–35 MeV. The rates of these...sections 1429 and natCa(3He,x)36Cl in the energy region from about 5 to 35 MeV. Targets containing the...x)26Al and 26Mg(3He,x)26Al rise accordingly. In the region of maximum cross sections, approximately 7–12 MeV...be fit well with simple power law in the energy region of interest. For example, we obtain v2 ⁄ DoF =...source region (in the X-region of the young Sun perhaps), or within the irradiated target region itself |  | | Journal (article/letter/editorial) | | 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 |  | | Book | | 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 | | | Book | | 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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