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| 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 |
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| 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 |
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| 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...for example Ca in oldhamite caS, Mn in (MnFe)S alabandite and Mg in (MgMnFe)S niningerite. In this degree |
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| 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”...additional aubrites: Bustee, Khor Temiki, and Mayo Belwa. All are observed falls and therefore less likely...(BM 32100), Khor Temiki (BM 1934.781). and Mavo Belwa IBM 1976. M.11) were obtained from the British &eum |
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| 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...troilite, caswellsilverite ( NaCr& ) , ferroan alabandite ( ( Mn, Fe) S) , and daubreelite (FeCr&). Sulfides |
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| 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...1940; Keil et al., 1989), LAP 02233 (Antarctic Meteorite Newsletter, 2003, 2004), LAP 03719 (McCoy et al...classified as aubrites that are actually other meteorite types. Table 1 Ranges and average modal (vol%)...Bishopville, Bustee, Cumberland Falls, Khor Temiki, Mayo Belwa, Norton County, Peña Blanca Spring and Pesyanoe |
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| reclassified as EL (the former contains ferroan alabandite and both contain kamacite with 1 wt% Si). All...weathering category A (Meteorite Newsletter 15), Y-980223 is listed as category A/B (Meteorite Newsletter 16)...cardboard slides. For standards we used the Allende meteorite (Jarosewich et al., 1987), the USGS international...1994), and the North Chile (Filomena) IIAB iron meteorite. Analyses were carried out following a protocol...occurs in Y8404, Y-980211 and Y-980223; ferroan alabandite is present in Y-793225 and A-880239. Enstatite |
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| 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...associated with metallic Fe,Ni, troilite, and alabandite. The textures of the pyroxenitic clasts are plutonic...Ni, troilite, and ferroan and ferromagnesian alabandite. They are similar to the intracrystalline infiltration...metallic Fe.Ni, daubreelite and ferromagnesian alabandite. Some of the larger opaque spherules consist |
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| carbonates in hot water extracts of the Norton County meteorite. DuFresne and Anders (1962) found vaterite mixed...achondrites Aubres, Bishopville, Khor Temiki, Mayo Belwa, Pefia Blanca Springs and Pesyanoe (DuFresne...oldhamite in several polished thin sections of this meteorite. Furthermore, inspection of thousands of specimens...were scraped off the surfaces of Norton County meteorite fragments using a sharp-pointed needle and were...such as kamacite, troilite and ferromagnesian alabandite (Fig. 2). The chemical compositions of oldhamite |
 | 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 |
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| 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...taenite, troilite, daubreelite, and ferroan alabandite (Keil 2010). Many of the ≥100-lm-size troilite...orthopyroxene. Also present are minor daubreelite, alabandite, metallic Fe-Ni, and troilite (Meteoritical Bulletin |
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| in this study were selected from the Antarctic meteorite collection of the National Institute of Polar...first discovery of phlogopite in an enstatite meteorite. Figure 3 shows a typical occurrence of the phlogopite...occurrence, since phases A/B are absent in this meteorite (b). Width of image is 110 pm for (a) and 190pm...in the opaque phases was not observed in this meteorite. Plagioclase (up to 20-30 pm) and a silica mineral...minerals, but no niningerite was found in this meteorite. Instead, there is a grain of (Mg, Mn, Fe)S solid |
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| 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 |
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| 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. ~~ ~ |
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| the IMACNMNC, including 17 from the Allende CV3 meteorite (Ma, 2015a) and high-pressure phases such as bridgmanite...suessite xifengite sulfides and hydroxysulfides alabandite bornite brezinaite browneite buseckite butianite...daubréelite digenite djerfisherite erlichmanite ferroan alabandite galena gentnerite (not approved) greigite heazlewoodite...aenigmatite ahrensite akaganéite åkermanite akimotoite alabandite albite allabogdanite allendeite almandine altaite...feldspar group feroxyhyte ferrihydrite ferroan alabandite ferroan antigorite ferromerrillite ferropseudobrookite |
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| 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 |
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| 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 |
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| 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 |
