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WADSLEYITE, NATURAL F-(Mg, Fe).Sion from the PEACE

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WADSLEYITE, NATURAL F-(Mg, Fe).Sion from the PEACE Canadian Mineralogist Vol. 21, pp. 29-35(1983) WADSLEYITE,NATURAL F-(Mg, Fe).SiOnFROM THE PEACERIVEH METEORITE G. D. PRICE, A. PUTNIS eNp S. O. AGRELL Departmentof Earth Sciettces,University ol Cambridge,Cambridge CB2 3EQ, England D. G. W. SMITH Departmentof Geology,University of Alberta, Edmonton,Alberta T6G 2E3 ABsrRAcr tion 6lectroniquesont compatiblesavec le groupe spatialImma. La nouvelleespdce honore feu le Dr. Wadsleyite, a new mineral species, occurs as a A.D. WadsleST'. fine-grained material in fragments within a vein (Iraduit par la R6daction) in the Peace River meteorite (Alberta); it was formed by a series of polymorphic phase trans- Mots clds: wadsleyite,nouvelle espdce,F-(MeFe)z formations, from olivine and ringwoodite, during SiOr,polymorphe, min6ral du manteau,m6t6orite, (Alberta). an extraterrestrial shock event. Wadslevite has the 6v6nementde choc, PeaceRiver structure of the P-phase polymorph of (IvIg,Fe)cSiOr and an ideal composition of (Mg,."Feo.JSiOo.Single INtnoouctIox crystals of wadsleyite rarely exceed 5 p,m in dia- meter; polycrystalline aggregates are transparent Wadsleyite, a new mineral species found in with a pale fawn coloration and a bulk index of the Peace River meteorite (Alberta), is the refraction of 1.76. The strongest six reflections in naturally occurring B-phase polymorph of (Mg, the X-ray powder-diffracrion pattern td in A qy Fe)rSiO.. The occurrence of the p-phase as an (/r A l)l are: 2.89(m) (040), 2.69(m) (013), 2.45(s) intermediate in the high-pressuretransformation (lal), 2.04(s) (240), r.57(m) (303), L4aG) Qa{. of magnesium-rich olivine to its spinel-structure Wadsleyite is orthorhombic with a 5.70(2), b ll.Sl polymorph was first reported Ringwood (7), c 8.24(4) L, V Slt(l) ]r", Z- 8 and. on the by & basis of the ideal formula, has a calculated density Major (1966). The B-phase was subsequently of 3.84 g cm-3. All observed X-ray and electron- confirmed to have a stability field by Akimoto diffraction data are compatible with space group & Sato (1968),Akimoto (1970) and others,who Imma. The new species is named after the late performed further studies on the system (Mg, Dr. A. D. Wadsley. Fe)$iOa and also synthesizedisostructural ana- logues with compositions CozSiOa, MnrGeO4, Keywords: wadsleyite, new mineral species, F-(Ms, Ni,,AlrSiO' Fe)rSiO., polymorph, mantle mineral, shock and ZnzSiO". event, meteorite, Peace River (Alberta). Phase equilibria in the solid-solution series MgrSiO'-FerSiOo have been widely studied be- Souuernr cause the polymorphic phase transformations in this series are believed to determine directly the La wadsleyite, espdce nouvelle, se pr6sente en structure of the earth's mantle. In particular, the mat6riau finement grenu dans des fragments i polymorph of (Mg,Fe)zSiOais expected peacE li-phase l'int6rieur d'un filon dans la m6t6orite de to comprise a significant proportion of the River (Alberta). Elle s'est formde par transforma- transition zone of the mantle. Obviously, since tions polymorphiques, i partir d'olivine et de no mantle-derivedp-phase is ringwoodite lors d'un dv6nement-chocextraterrestre. available,the study La structure est du type g-(Mg,Fe)2SiOr, avec of this compound has previously been restricted (Mg,."Feo.5)SiOo comme composition id6ale. Ies to synthetic material. The discovery of wads- monocristaux excident rarement 5 um de diamdtre: leyite in the PeaceRiver meteorite is particularly les agr6gats polycristallins sont transparents et pos- important, therefore, because of the further sadent une faible coloration fauve et un indice insight into the behavior of this mantle-forming de r6fraction moyen de 1.76. I-es raies les plus material that can be obtained by studying the intenses du ctich6 de pondre [d en A(tXlr & /)] sont: naturally produced 2.89(m) (040), 2.69(m) (013), 2.4s(s) (l4l), 2.04(s) B-phase. It was originally proposed by Ringwood & (240), 1.57(m) (303), La4G) Q44. La wadsleyite est orthorhombique avec a 5.70Q), b ll.5l(7), Major (1970, p. 107) that if p-(Mg,Fe),SiO, c 8.24(41 4,, V SqtQ) A" pour Z - 8; sa densit6 were ever to be found in nature, it should be calcul6e ir partir de la formule id6ale est de 3.84. named wadsleyitein honor of the late Dr. A. D. Toutes les donlr6es de diffraction X et de diffrac- Wadsley, "whose outstanding crystallographic 29 THE CANADIAN MINERALOGIST left and right of the Hc. l. A. Typical vein-structure in the Peace River meteorite. The light areas to the The opaque vein-material vein are recrystallized chondrite of which the meteoriie is largely composed. phases. rounded fragments is made up of sulfide *O -"t"f aroplets and microcrystalline silicate The WADSLEYITE FROM THE PEACE RIVER METEORITE 31 investigations in minerals and inorganic com- by transmission electron microscopy (TEM). pounds are renowned to all within his field and The polycrystalline aggregates of wadsleyite to many outside". We endorse this proposal, have a felsitic texture and are invariablv fras- which has also been approved by the Commission tured. They are transparent and have a pale on New Minerals and Mineral Names of the fawn coloration. By virtue of the small crystal- International Mineralogical Association. The size,no detailedoptical data on wadsleyitecould type specimen is preserved in the collection of be obtained;however, the grains are anisotropic the Department of Geology, University of and show low, first-order birefringence colors. Alberta. Relatively large wadsleyiteaggregates have,'an effective index of refraction of 1.76. This com- OccunnnNcn AND AppEARANcE pareswell with the valueof 1.77 calculatedfrom the Gladstone-Dale mle (Mandarino 19j6, . Wadsleyite has been found in the L6 hyper- 1978, 1979). sthene-olivine peace chondritic River meteorire, TEM shows that wadsleyite polycrystalline the fall and recovery of which have been des- aggregatesare generally composed of well- cribed by Folinsbee & Bayrock (1964). The formed gralns, with intergranular boundaries PeaceRiver meteorite is distinctly recrystallized, usually meeting at triple points (often with and has only a poorly preserved chondritic interfacial anglesclose to 120"). In addition to structure. The meteorite is largely an assem_ wadsleyite, the fragments may contain small blage of olivine, orthopyroxene, plagioclase, amounts of majorite or microcrystallineaggre- iron-rqickel alloys and troilite. plagioglase ThO gates of pyroxene pseudomorphing majorite has.beenextensively converted to its amorphous (Price et al.1979) and highly faulted ring- equivalent,maskelynite, which indicates thit the woodite. Wadsleyite is also occasionally found meteorite has been subjected to a high-pressure to carry stacking faults, which predominantly shock event. In addition to this shock-produced lie on.(010) (Fig. lC). Thesemay be viewedas phase, the Peace River meteorite contains thin, Frank-type faults, corresponding to the removal black, sulfide-rich veins, which pervade the body of a stoichiometric (Mg,Fe)zSiO*layer accom- of the specimen in much the same wav as veins panied by a V+[OIO]displacementn and are inter- found in other meteorites believed to have preted as being structural mistakes incurred undergone an extraterrestrial shock event [e.g., during the relatively rapid, post-shock growth Tenham, Coorara, Catherwood and Coolamon: process. Price et al. (1979)1. Typically, within rounded fragmentsfound in theseveins, the constituent Cnrurcel AND SrRucrunel .Dere grains of olivine and orthopyroxene have been transformed into their high-density polymorphs, Electron-microprobedata for olivine, wads- the spinel-structure ringwoodite and the garnet- leyite and the other major, nonmetallic phases structuremajorite, respectively(e.S,., Binns 1970, found in the PeaceRiver meteoriteare given in Price et al. 1979), The vein studied in the peace Table I, and their recalculatedstnrctural for- River meteorite differs significantly from those mulae in Table 2. The analyseswere performed described in other meteorites. however. in that using an ARL EMX microprobe fitted with it containssignificant quantities of wadsleyite. three wavelength-dispersionspectronleters and The wadsleyite occurs as microcrystalline an Ortec energy-dispersionspectrometer. Well- ageregatesthat pseudomorphpreviously existing characterized analytical standards were used olivine fragments within the vein (Figs. lA, B,t. throughout. All data were obtained at an oper- The wadsleyite-bearingfragments rarely exceed ating voltage of 15 kV and with probe currents 0.5 mm in diameter, and the actual grain-size of the order of 20 nA. Wavelength-dispersion of the crystals within the polycrystallinefrag- results were processed using ApL program ments is between 0.5 and 5 prn, as estimated PROBEDATA (Smith & Tomlinson 1970), and within the vein are largely composed of shocked olivine and its high-density polymorphs, wadsleyite and ringwoodite. B. An enlarged view of a wadsleyite-bearing fragrient surioundid Uy vein material. The.fragment is made up of microcrystaltine wadsleyite (W) and shoiked olivine (o). the"devetopment of tracturing is common. C. Transmission electron micrograph of wadsleyite, showing stacking faults developed normal to (010). The faults have a displacemint of %tol}). These faults occui in the wadsleyite because of the relatively rapid, post-shock grcwth pro".... tj. Electron micrograp6- of a fault-free wadsleyite OV)_grai1 _topoJacticallyreplacing highly faulted ringwoodite (R). The i*o ptru... are related such that [010]rr ll [ll0Jn and [001]s li [001]n. 32 THE CANADIAN MINERALOGIST
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