 | | Journal (article/letter/editorial) | | METAL AND SCHREIBERSITE IN MAYO BELWA, AN ENSTATITE ACHONDRITE A.L. Graham Department ofMineralogy British...Museum (Natural History) London SW7 5BD The Mayo Belwa meteorite (an aubrite} contains discrete metal grains...are distributed heterogeneously throughout the meteorite and are present both in the fine-grained matrix... The Mayo Belwa meteorite is a brecciated enstatite achondrite (aubrite) which fell in Nigeria in August...and form the subject of the present paper. The meteorite is composed mainly of disordered enstatite, WOo |  | | Journal (article/letter/editorial) | | of a metallic nodule from the Bondoc Peninsula meteorite, I21 (Syn.), MI Bad na h'Achlaise, Assynt, Sutherland...), and FRANCIS (J. G.), Amphibole in the Mayo Belwa meteorite, 53I BEVAN (J. C.), see BEVAN (A. W. R.)...anal., opt., cryst., Xray, 398 Bondoc Peninsula meteorite, metallic nodule with silicate inclusions, anal...blast-furnace slag and a comparison with the Allende meteorite, 493 Callowhill Upper, Newtown Mr. Kennedy, Co...blast-furnace slag, anal., 493; Norway, 513; Mayo Belwa meteorite, anal., 487 Diorite, Papua, anal., 528 (Syn |  | | Journal (article/letter/editorial) | | x Impact melting in the Cumberland Falls and Mayo Belwa aubrites Alan E. RUBIN* Institute of Geophysics...when it collided with the Cumberland Falls host. Mayo Belwa is the first known aubrite impact melt breccia...constitute 5 vol% of the meteorite. They occur nearly exclusively within the Mayo Belwa matrix; literature...impact melt breccias. It seems likely that in Mayo Belwa, volatiles were vaporized during an impact event...material in two aubrites—Cumberland Falls and Mayo Belwa. Cumberland Falls is a polymict breccia with |  | | Journal (article/letter/editorial) | | EARTII ELEMENT ABUNDANCES IN SEPARATED PHASES OF MAYO BELWA, AN ENSTATITE ACHONDRITE A.L. Grabam and P. Henderson... SW7 SBD. U.K. Separated fractions from the Mayo Belwa aubrite have been analysedfor the rare earth...account for the total REE abundances in the bulk meteorite which are about 0.5 times chondritic. The REE...ofthe feldspar is greater than that ofthe bulk meteorite. The partition coefficients for the REE between...to the enstatite chondrites and indeed these meteorite groups have very similaroxygen isotopic systematics |  | | Report (issue) | | 8:00 O 22 [(OH)0: 81 F 0:57 ] §=1:38 : (2) Mayo Belwa meteorite; by electron microprobe, average of three...in meteorites. Association: Leucite, diopside, forsterite, calcite, apatite, natrolite, phlogopite, cristobalite...and J.G. Francis (1977) Amphibole in the Mayo Belwa meteorite: ¯rst occurrence in an enstatite achondrite |  | BURBINE, Thomas H., McCOY, Timothy J., NITTLER, Larry R., BENEDIX, Gretchen K., CLOUTIS, Edward A., Dickinson, Tamara L. (2002) Spectra of extremely reduced assemblages: Implications for Mercury. Meteoritics & Planetary Science, 37 (9) 1233-1244 doi:10.1111/j.1945-5100.2002.tb00892.x | Journal (article/letter/editorial) | | identification of mercurian meteorites in our meteorite collection, which have presently not been identified...However, the high FeO content in this basaltic meteorite would indicate it came from a body with a small...selected bulk samples of Khor Temiki (USNM 1551) and Mayo Belwa (USNM 5873) and a coarse-grained, igneous clast...spectral analyses, polished thin sections of each meteorite were studied optically to examine textural features...mineralogies and mineral chemistries for Khor Temiki, Mayo Belwa, and Norton 1235 County. We expect no significant |  | | Journal (article/letter/editorial) | | metallographic study of the Angra dos Reis (iron) meteorite. Mineral. Mag. 38,94-101. Axon, H.J. and C.V....exceptionally large chondrule in the Parnallee meteorite. Mineral Mag. 36,319-323. Binns, R.A., 1968. Cognate...inclusion of unique type in Cumberland Falls meteorite. In Meteorite Research, P.M. Millman, ed., D. Reidel... 1966. A potassium-argon age for the Barwell meteorite. Nature 210,620. Graham, A.L., AJ. Easton, R.... Hutchison and D.Y. Jerome. 1976. The Bovedy meteorite; mineral chemistry and origin of its Ca-rich glass |  | | Journal (article/letter/editorial) | | albitic plagioclase, nearly FeO-free diopside and forsterite, metallic Fe,Ni, troilite, and a host of rare...alert to the potential discovery of a genuine meteorite from Mercury which, superficially, should resemble...and, if true, a meteorite from Mercury should not resemble any currently known meteorite type. & 2010 Elsevier...albitic plagioclase, nearly FeO-free diopside and forsterite (e.g., Watters and Prinz, 1979), Si-bearing metallic...1940; Keil et al., 1989), LAP 02233 (Antarctic Meteorite Newsletter, 2003, 2004), LAP 03719 (McCoy et al |  | | Journal (article/letter/editorial) | | the aubrites. Literature data even for the same meteorite often disagree. Whole-rock REE analyses by STRAIT...studies involving several samples from the same meteorite ( OKADA et al., 1988; KEIL et al., 1989). NEWSOM...In an investigation of mineral separates from Mayo Belwa, GRAHAM and HENDERSON ( 1985) reported a “magnetic”...(REID and COHEN, 1967) with varying amounts of forsterite, diopside, plagioclase, metal, and troilite,...additional aubrites: Bustee, Khor Temiki, and Mayo Belwa. All are observed falls and therefore less likely |  | | Journal (article/letter/editorial) | | patterns extends to d&rent samples from the same meteorite. STRAIT ( 1983) found positive Eu anomalies for...studies involving several samples from the same meteorite ( OKADA et al., 1988; KEIL et al., 1989). An investigation...straightforward results. Analyses of mineral separates from Mayo Belwa (GRAHAM and HENDERSON,1985) showed that a “magnetic”...on the Bishopville enstatite achondrite. This meteorite is a typical aubrite except for a high modal abundance...Most other phases in the aubrites, including forsterite, troilite, metal, and caswellsilverite, are devoid |  | | Journal (article/letter/editorial) | | chondrite impact-melt breccia (Rubin 2010). The Mayo Belwa whole rock is itself an impact-melt breccia containing...Olympus BX60 petrographic microscope. Antarctic meteorite sections are from Johnson Space Center, NASA;...brecciation characteristics of selected aubrites. Meteorite Shock Shock stage stage Recovery pyroxene olivine...diffusion coefficient for Mg: e.g., ~2 9 10 18 for forsterite with 1.2 wt% FeO versus 10 20–10 21 for enstatite...exhibiting many of the shock features evident in other meteorite groups because the majority of the features involve |  | | Journal (article/letter/editorial) | | These lithologies include dunites (represented by forsterite crystals), plutonic orthopyroxenites (represented...Pefia Blanca Spring (Lonsdale, 1947); 4 em in Mayo Belwa (Graham et al., 1977); 8 em in Norton County...BHVO-I (Gladney et al., 1983) and the Allende meteorite reference sample (larosewich et al., 1987) (used...silica; microporphyritic clasts consisting of forsterite and ortho- and clinoenstatite microphenocrysts...Kota-Kota (Reed, 1968) and the anomalous iron meteorite Horse Creek (Fredriksson and Henderson, 1965) |  | | Journal (article/letter/editorial) | | Aubrites represent samples from a third enstatite meteorite parent body. 3. The aubrite parent body may have...Shallowater may be a sample from yet a fourth enstatite meteorite parent body. 6. Shallowater experienced a complex...reassembly. 7. It is unknown why some enstatite meteorite parent bodies melted (the aubrite and Shallowater...Tucson iron meteorite which had previously been thought to be related to the enstatite meteorite clan (Nehru...Kaczaral et al. (1988) suggested that all three meteorite types come from one parent body that was initially |  | | Journal (article/letter/editorial) | | Aubrites Shock effects Asteroidal parent bodies Meteorite breccias Impact melting Sinoite a b s t r a c...impact-melt globules and spherules. No single meteorite possesses all of these features, although many...history (4.50–4.54 Ga ago); only one enstatite-rich meteorite (EH4 Bethune) appears to have been impact heated...Table 2 Shock stages of enstatite chondrites. Meteorite Group/type Recovery Shock stage Breccia type...Erde xxx (2014) xxx–xxx 6 Table 2 (Continued) Meteorite Group/type Recovery Shock stage Breccia type |  | | Journal (article/letter/editorial) | | Society, 1997. Printed in USA. Mineralogy of meteorite groups ALANE. RUBIN Institute of Geophysics and...shocked ordinary chondrites. Secondary minerals in meteorite finds that formed during terrestrial weathering...numbers of meteorites (including members of new meteorite groups; Table 1) from hot and cold deserts, the...variations 23 1 A. E. Rubin 232 TABLEI . Meteorite classification. Chondrites Carbonaceous chondrites...Wasson and Kallemeyn, 1990). 233 Mineralogy of meteorite groups TABLE 2. Minerals in meteorites. ~~ ~ |  | | Journal (article/letter/editorial) | | the IMACNMNC, including 17 from the Allende CV3 meteorite (Ma, 2015a) and high-pressure phases such as bridgmanite...åkermanite chevkinite Formula ARTICLE IN PRESS forsterite goldmanite grossular hutcheonite kirschsteinite...ferrosilite florenskyite fluorapatite fluor-richterite forsterite galena galileiite gehlenite geikielite gentnerite...spinel, anorthite, albite, Ca pyroxene (diopside), forsterite, enstatite, gehlenite (Ca2 Al(Si,Al) 2 O7 ),...coarse forsterite grains along with pyroxene, spinel and melilite; they are also known as forsterite-bearing |  | | Journal (article/letter/editorial) | | the surface, so rapidly that portions of the meteorite and the ground which were in contact were vaporized...people wondered about what would happen if a large meteorite fell to the ground, but they were limited by the...meteorites and the corollary that the size of the meteorite was quite small relative to the crater it could...an equal mass of TNT. The kinetic energy of a meteorite changes with the square of the velocity and hence...far more probable that the angle of impact of a meteorite with earth or moon is low rather than high. Previously |  | | Book | | METEORITE MINERALOGY Meteorites are fascinating cosmic visitors. Using accessible language, this book...book documents the history of mineralogy and meteorite research, summarizes the mineralogical characteristics...photographs of meteorite minerals, and with an accompanying online list of meteorite minerals, this book...book provides a useful resource for meteorite researchers, terrestrial mineralogists, cosmochemists,...students in these fields. a l a n e . r u b i n is a meteorite researcher who recently retired from the University |  | | Book | | composition of stone meteorites. How to recognize a meteorite. Brazilian stone meteorites. 7.1. ACHONDRITES...chondrite . Parambu. Acknowledgments . References.^.. Meteorite index. Page 1 3 11 29 35 45 47 48 48 48 61 61...during the agglomeration of the meteorite parent bodies. When a meteorite is seen to fall and material is...is collected, the meteorite is referred to as a fall. On the other hand, a meteorite find is the by-chance...meteorites Figure 1 - The Bendego, Bahia, Brazil iron meteorite, weighing approximately 5,360 kg. Note the irregular |
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