 | | Journal (article/letter/editorial) | | DECEMBER 1 9 7 7 , VOL. 4 I , PP. 487-92 The Mayo Belwa meteorite: a new enstatite achondrite fall A. L. GRAHAM...(Natural History), London SW7 5BD SUMMARY.Mayo Belwa, a highly shocked enstatite achondrite, fell during...the evening of 3 August I974 in the Adamawa District, NE. Nigeria (8~ 58' N., 12~ o5' E.). The stone weighed...and was deposited in the Geological Survey of Nigeria and loaned for study to the British Museum (Natural...Or3), and minor Fe-Ni metal and the sulphides oldhamite, daubr6elite, ferroan alabandine, and troilite |  | | 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) | | 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...e are presentin sulphides, for example Ca in oldhamite caS, Mn in (MnFe)S alabandite and Mg in (MgMnFe)S |  | | 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 ļ¬rst 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 aubritesāCumberland Falls and Mayo Belwa. Cumberland Falls is a polymict breccia with |  | 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) | | COl6-7037/93/$6.00+ .OU Heterogeneous REE patterns in oldhamite from aubrites: Their nature and origin CHRISTINE...Abstract-A comprehensive study of the REEs in oldhamite from three aubrites confirms that heterogeneous...are directly comparable to REE patterns seen in oldhamite from the unequilibrated (E3-4) enstatite chondrites...REE patterns seen in oldhamite from the aubrites. It is proposed that oldhamite was close to the liquidus...formation in the solar nebula. In contrast to oldhamite from the aubrites and E3-4 chondrites, CaS from |  | | Journal (article/letter/editorial) | | measurements in the Bishopville aubrite confirm that oldhamite ( CaS)is the dominant REE carrier, while most...major silicates, are extremely REEdepleted. In oldhamite, a variety of REE patterns are observed, which...aubrites have clearly undergone igneous processing, oldhamite (which is highly refractory) may be a relict phase...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 |  | | Journal (article/letter/editorial) | | UNUSUAL WEATHERING PRODUCTS OF OLDHAMITE PARENTAGE IN THE NORTON COUNTY ENSTATITE ACHONDRITE Aklhlko...suggest that these minerals formed by weathering of oldhamite (CaS), which we found to occur in Norton County...in the terrestrial environment, hydrolysis of oldhamite is the most important first step in the weathering...weathering sequence in the terrestrial environment of oldhamite ā¢ portlandite ā¢ vaterite ā¢ calcite. The mineral...weathering environment of Norton County). INTRODUCTION Oldhamite is found only in enstatite chondrites and enstatite |  | | Journal (article/letter/editorial) | | alert to the potential discovery of a genuine meteorite from Mercury which, superļ¬cially, 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...classiļ¬ed 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, PenĢa Blanca Spring and Pesyanoe |  | | Journal (article/letter/editorial) | | 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...ālithophileā rare earth elements partition strongly into oldhamite (CaS) rather than into oxide minerals (Larimer...diļ¬cult to use these data to determine whether this meteorite is more closely related to EH or EL chondrites |  | | Journal (article/letter/editorial) | | 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, kamacite, taenite, titanoan troilite, oldhamite and caswellsilverite. Xenomorphic plagioclase...grain-tograin Ti contents (Table 10). Occurrences of oldhamite and caswellsilverite are associated with metallic...alabandite; c. Ferromagnesian alabandite; d. Oldhamite. 2. Pyroxenitic clast, troilite. 67 Norton |  | | Journal (article/letter/editorial) | | enstatlte from Btshopvllle, Cumberland Falls and Mayo Belwa have also been analysed In these three aubrItes...of our results uncertain Cumberland Falls and Mayo Belwa probably suffered relatwely recent shocks and...analysed density separates from the type-I Indarch meteorite and found an lsochron indistinguishable from their...the aubntes Blshopvdle, Cumberland Falls and Mayo Belwa, all three of which might have had a shock-dommated...Blshopvllle (1 25 g), Cumberland Falls (1 25 g) and Mayo Belwa (800 mg) were obtained from the Museum National |  | | Journal (article/letter/editorial) | | Aubrites Shock effects Asteroidal parent bodies Meteorite breccias Impact melting Sinoite a b s t r a c...low MnO in enstatite, high Mn in troilite and oldhamite, grains of keilite, abundant silica, euhedral...impact-melt globules and spherules. No single meteorite possesses all of these features, although many...REE fractionations due to melting and loss of oldhamite (CaS) ā the main REE carrier in enstatite meteorites...enstatite and enrichment of Mn in troilite and oldhamite; Rubin, 2008) and alteration of the bulk chemical |  | | 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) | | in this study were selected from the Antarctic meteorite collection of the National Institute of Polar...Phlogopite Fe- Ni Metal Schreibersite Perryite Oldhamite (Mg,Mn,Fe)S Troilite Sphalerite Djerfisherite...schreibersite, graphite and sphalerite. Relic oldhamite was found in weathered assemblages only in Y-8414...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 |  | | 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...graphite, schreibersite, troilite, daubreelite, oldhamite, osbornite, chromite, magnetite, tridymite, olivine...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 |  | | Journal (article/letter/editorial) | | the IMACNMNC, including 17 from the Allende CV3 meteorite (Ma, 2015a) and high-pressure phases such as bridgmanite...millerite molybdenite murchisite niningerite nuwaite oldhamite pentlandite plagionite pyrite pyrrhotite rudashevskyite...(not approved) nontronite nuwaite nyerereite oldhamite olivine olkhonskite omeiite omphacite opal orcelite...ļ¬ne-grained condensates including sinoite (Si2 N2 O), oldhamite (CaS), graphite, enstatite, diopside, sphalerite...alabandite ((Mn,Fe)S), daubrĆ©elite (FeCr2 S4 ), oldhamite (CaS), caswellsilverite (NaCrS2 ) (and other Cr-rich |  | | 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 ļ¬elds. 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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