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| 7 , VOL. 4 I , PP. 487-92 The Mayo Belwa meteorite: a new enstatite achondrite fall A. L. GRAHAM,A....History), London SW7 5BD SUMMARY.Mayo Belwa, a highly shocked enstatite achondrite, fell during the evening...evening of 3 August I974 in the Adamawa District, NE. Nigeria (8~ 58' N., 12~ o5' E.). The stone weighed 4...and was deposited in the Geological Survey of Nigeria and loaned for study to the British Museum (Natural...(Natural History). It is composed principally of enstatite (o.02 FeO%), with some olivine (Fo10o), diopside |
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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...tendency for low Ni, low Si metal to be within enstatite crystals. Schreibersite (8-14.4% Ni) occurs as... The Mayo Belwa meteorite is a brecciated enstatite achondrite (aubrite) which fell in Nigeria in August |
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| 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 |
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| x Impact melting in the Cumberland Falls and Mayo Belwa aubrites Alan E. RUBIN* Institute of Geophysics...Falls host. Mayo Belwa is the first known aubrite impact melt breccia. It contains coarse enstatite grains...grains exhibiting mosaic extinction; the enstatite grains are surrounded by a melt matrix composed of 3–16...3–16 lm-size euhedral and subhedral enstatite grains embedded in sodic plagioclase. Numerous vugs, ranging...constitute 5 vol% of the meteorite. They occur nearly exclusively within the Mayo Belwa matrix; literature |
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| 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...INTRODUCTION Enstatite achondrites - aubrites - are heterogeneous assemblages of nearly iron-free enstatite and |
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| 8:00 O 22 [(OH)0: 81 F 0:57 ] §=1:38 : (2) Mayo Belwa meteorite; by electron microprobe, average of three...apatite, natrolite, phlogopite, cristobalite, enstatite, plagioclase. Distribution: A few historic localities...(1977) Amphibole in the Mayo Belwa meteorite: ¯rst occurrence in an enstatite achondrite. Mineral. Mag |
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| the remaining aubrites (Bustee, Khor Temiki, Mayo Belwa and Shallowater). High Ga/Ni and Ge/Ni ratios...have a wide compositional range like that in Mayo Belwa (Graham, 1978). In Shallowater the distribution...(Keil, 1968), this is not so for the aubrite Mayo Belwa (Graham, 1978) and therefore it was decided to...Aubrites Aubres Bishopville Bustee KhorTemiki Mayo Belwa Norton County Peiia Blanca Spring Shallowater...calculated as follows: From the metal content of each meteorite (Easton, 1982) and the P content of kamacite (Table |
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| Shallowater). The bulk chemical analysis of the aubrite Mayo Belwa (Graham et al., 1977) is included for comparison...samples that appeared to be representative of each meteorite. The weight of each sample (Table I) was largely...largely governed by the total weight of the meteorite in the Collection of the British Museum (Natural History);...Bustft 32100 New analyses by the author, except Mayo Belwa(A.J. Easton, inGraham et al., 1977) Non-magnetlc...Blanca Spring aubrite require discussion. This meteorite fell into a drainage pond and at least one fragment |
 | 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) |
| easily distinguish between a lunar highlands and enstatite basalt composition since these materials have...strongest argument against Mercury having an enstatite basalt composition is its extreme spectral redness...1300-1400 K), possibly similar to the enstatite chondrites. Enstatite chondrites are composed (e.g., Keil...Keil, 1968) primarily of enstatite, metal, sulfides, and plagioclase. This precursor material would then...Mercury's density is much higher than that of enstatite chondrites (about 3.4-3.7 g/cms) (Consolmagno |
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| seen in oldhamite from the unequilibrated (E3-4) enstatite chondrites, and many of these exhibit positive...E3-4 chondrites, CaS from two equilibrated (EL6) enstatite chondrites shows high and uniform REE abundances...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...abundances in the aubrites with a two-component (enstatite and plagioclase) mixing model, the addition of |
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| of the elements, e.g. silicon in the metal of enstatite chondrites will appear as the oxide). MINERAL...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. |
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| the press. FALL OF THE ACAPULCO, MEXICO,STONY METEORITE Name: ACAPULCO Place of fall: El Quemado Colony...Source: DISCOVERY OF THEALISKEROVO, USSR,IRON METEORITE Name: ALISKEROVO Place of find: About 4.5 km...Total weight: 58.4 kg Circumstances of find: Meteorite was found by the worker A. Cherednichenko when... USSR. FALL OF THE ALTA 'AMEEM, IRAQ, STONY METEORITE Name: ALTA'AMEEM Place of fall: About 100 m...reported hearing a humming sound that ended when the meteorite struck the ground. Source: Dr. Y. Al-Rawi, Department |
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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...abundances in Bishopville with a two-component (enstatite and plagioclase) mixing model, the addition of...straightforward results. Analyses of mineral separates from Mayo Belwa (GRAHAM and HENDERSON,1985) showed that a “magnetic”...separates from the paired Antarctic THE AUBRITES, OR ENSTATITE achondrites, are a relatively rare group (only |
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| Netherlands 420 [61 s 7Rb.87Sr CHRONOLOGY OF ENSTATITE METEORITES J -F M I N S T E R , L -P R I C A R...and Saint Sauveur can be mixing hnes between enstatite and feldspar The results are interpreted m terms...secondary effects type-I and intermediate-type enstatIte chondrltes have been shocked 6 0 - 2 0 0 m y after...ages of enstatite meteorites Whole rock and enstatlte from Btshopvllle, Cumberland Falls and Mayo Belwa...of our results uncertain Cumberland Falls and Mayo Belwa probably suffered relatwely recent shocks and |
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| PRODUCTS OF OLDHAMITE PARENTAGE IN THE NORTON COUNTY ENSTATITE ACHONDRITE Aklhlko Okada·, Klaus Kell and G.J...occur on surfaces offragments ofthe Norton County enstatite achondrite. X-ray powder analysis ofthese materials...INTRODUCTION Oldhamite is found only in enstatite chondrites and enstatite achondrites. Because of the reduced...carbonates in hot water extracts of the Norton County meteorite. DuFresne and Anders (1962) found vaterite mixed...mixed with oldhamite in the Pesyanoe enstatite achondrite, but they could not explain the origin of vaterite |
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| homepage: www.elsevier.de/chemer INVITED REVIEW Enstatite achondrite meteorites (aubrites) and the histories...nearly monomineralic enstatite pyroxenites, consisting mostly of nearly FeO-free enstatite, with minor albitic...isotopic compositions suggest close kinship to the enstatite chondrites. However, they did not form from known...their parent bodies. Rather, they formed from enstatite chondrite-like material on at least two separate...the melting and fractional crystallization of enstatite chondritelike parent lithologies, which should |
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| elsevier.com/locate/gca Shock effects in “EH6” enstatite chondrites and implications for collisional heating...wt% Si). All of the meteorites contain euhedral enstatite grains surrounded by metal ± sulfide (although...Y-793225), consistent with enstatite crystallizing from a mixed melt. All contain enstatite with <0.04 wt% MnO;...show that typical EH3–EH5 chondrites contain enstatite with 0.13–0.20 wt% MnO and troilite with 0.05–0...10 wt%, respectively), a rare phase in most enstatite chondrites. We suggest that all six meteorites |
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| annealed to S1. INTRODUCTION Although a few enstatite achondrites (aubrites) appear unbrecciated (e...chondrite impact-melt breccia (Rubin 2010). The Mayo Belwa whole rock is itself an impact-melt breccia containing...et al. (1997) for ordinary, carbonaceous, and enstatite chondrites, it is clear that aubrite whole rocks...derived from a large cratering event on a porous enstatite chondritic asteroid. The parental rocks may have...Olympus BX60 petrographic microscope. Antarctic meteorite sections are from Johnson Space Center, NASA; |
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| Parent Asteroid: Evidence from the Norton County Enstatite Achondrite AKIHIKO OKADA,* KLAUS KEIL, G. JEFFREY...studied numerous specimens of the Norton County enstatite achondrite (aubrite) by optical microscopy, electron...consisting of a clastic matrix made mostly of crushed enstatite, into which are embedded a variety of mineral...plutonic orthopyroxenites (represented by most enstatite crystals in the matrix), plutonic pyroxenites...crystallization of a melt of enstatite chondrite composition on the enstatite chondrite parent body. Keil |
 | Floss, C., Jolliff, B. L., Benedix, G. K., Stadermann, F. J., Reid, J. (2007) Hammadah al Hamra 193: The first amphibole-bearing winonaite. American Mineralogist, 92 (4) 460-467 doi:10.2138/am.2007.2253 | Journal (article/letter/editorial) |
| fluor-apatite in this meteorite. The presence of fluoro-edenite in HaH 193, a meteorite that experienced extensive...compositions are distinct from those of other meteorite groups, except for silicate inclusions in IAB...2003), attesting to the chondritic origin of this meteorite group. Hammadah al Hamra (HaH) 193 was found in...reduced compositions that fall between those of enstatite and ordinary (H) chondrites (Brearley and Jones...to determine the bulk REE composition of this meteorite (Fig. 5). The REE pattern calculated using the |
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| de/chemer Invited Review Impact features of enstatite-rich meteorites Alan E. Rubin ∗ Institute of Geophysics...Editorial handling - Klaus Keil Keywords: Enstatite chondrites Enstatite achondrites Aubrites Shock effects...Asteroidal parent bodies Meteorite breccias Impact melting Sinoite a b s t r a c t Enstatite-rich meteorites...include EH and EL chondrites, rare ungrouped enstatite chondrites, aubrites, a few metal-rich meteorites...partial-melt residues ultimately derived from enstatite chondrites. Members of these sets of rocks exhibit |
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| which could have only been preserved if this meteorite was not subjected to any significant thermal metamorphism...have only been identified in clasts in one other meteorite, the LL3.1 ordinary chondrite Krymka (e.g., Semenenko...analysis by the Johnson Space Center Antarctic Meteorite Collection. QUE 99177 was classified as Antarctic...clast is coarser-grained than matrix in the host meteorite. It contains olivine, amphiboles, sulfides, and...olivines are different from those in the host meteorite. Olivines are at least one order of magnitude |
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| © Meteoritical Society, 1989. Printed in USA Enstatite meteorites and their parent bodies* KLAUS KEIL...Abstract-Enstatite meteorites are highly reduced rocks that consist of major, nearly FeO-free enstatite, variable...bodies. 2. Aubrites were not derived from known enstatite chondrites on the same parent bodies. Aubrites...Aubrites represent samples from a third enstatite meteorite parent body. 3. The aubrite parent body may have...aubrite source material (parent body) was probably enstatite chondrite-like in composition, but had a higher |
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| mineralogical study of new EH melt rocks and a new enstatite chondrite grouplet Y. LIN132*AND M. KIMURAI 'Institute...accepted in revised form 1998 February 20) Abstract-Enstatite chondrites are classified into EH and EL groups...petrography and mineral chemistry of five new Antarctic enstatite chondrites. Yamato 793225 is characterized by...groups and probably represents a new grouplet of enstatite chondrites. The three paired meteorites (Y-8404...occurrence of phlogopite in enstatite meteorites. INTRODUCTION Enstatite chondrites are the most reduced |
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| Society, 1997. Printed in USA. Mineralogy of meteorite groups ALANE. RUBIN Institute of Geophysics and... The highly reduced enstatite chondrites and achondrites contain.major enstatite, plagioclase, free silica...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 |
Mayo Belwa meteorite, Mayo-Belwa, Adamawa, Nigeria