 | Floran, R.J., Prinz, Martin, Hlava, P.F., Keil, Klaus, Spettel, B., Wänke, H. (1981) Mineralogy, petrology, and trace element geochemistry of the Johnstown meteorite: a brecciated orthopyroxenite with siderophile and REE-rich components. Geochimica et Cosmochimica Acta, 45 (12) 2385-2391 doi:10.1016/0016-7037(81)90092-2 | Journal (article/letter/editorial) | | petrology, and trace element geochemistry of the Johnstown meteorite: a brecciated orthopyroxenite with siderophile...recisrd,form 10 Augutr 1981) Abstract-The Johnstown meteorite is a brecciated orthopyroxenite (diogenite)...unbrecciated samples from different portions of the meteorite show, respectively, the most enriched and the...most representative REE pattern for the bulk meteorite has an intermediate composition and was obtained...sample. The data presented here indicate that Johnstown is a monomict breccia, in contrast to several |  | | Journal (article/letter/editorial) | | E. University Blvd., Tucson, Arizona 85721–0092, USA address: Department of Geological Sciences, Brown...University, Box 1846, Providence, Rhode Island 02912, USA *Corresponding author. E-mail: Kerri_Donaldson_Hanna@brown...selection of howardite, eucrite, and diogenite (HED) meteorite samples. In addition, we apply the same technique...1755 © The Meteoritical Society, 2009. Printed in USA. 1756 K. Donaldson Hanna and A. L. Sprague demonstrated...collected thermal emission spectra of Vesta. The HED meteorite samples were crushed and sieved to <70 µm grain |  | | Journal (article/letter/editorial) | | 164 The relationship of orthopyroxene to pigeonite. (With Plate XIII.) By A~I~. POLDERVAART, t~r Ph...orthopyroxenes within this ORTHOPYROXENES AND PIGEONITE 165 range have been described mainly from eulysites...composi- ORTHOPYROXENES AND 167 PIGEONITE Orthopyroxene-pigeonite stability .fie/ds.--Various authors...773 0.018 3.88 88.2 1, Enstatite, Shallowater meteorite (Hess and Phillips, 1940). 2, Enstatite, Espedalen...Bronzite, Hanover, Cape (this paper). 8, Johnstown meteorite (Hovey, 1925). 9, Hypersthene, Naln, Labrador |  | | Journal (article/letter/editorial) | | the symmetrical zone. I n describing the Johnstown meteorite, E. 0. Hovey (1925) gives some data and an...suggested the presence of clinoenstatite in a meteorite along with enstatite on the basis of oblique extinction...Barth (1931) uses the terms 'clinoeustatite' and 'pigeonite' indiscriminately, while G. T. Prior (1920) proposed... and' clinoferrosilite' quite separate from' pigeonite' or ' enstatite-augite'. Very few reliable analyses...h e ' pigeonite B' of E. P. Henderson and H. T. Davies (1936) from the Moore County meteorite. Its greater |  | | Journal (article/letter/editorial) | | order-disorder in an orthopyroxene crystal from the Johnstown meteorite G . M . M o l i n a S.K. S a x e n a b a...Geology, Brooklyn College, Brooklyn, N Y 11210, USA * c Dipartimento di Scienze della Terra, Universith...and M2 sites of an orthopyroxene from the Johnstown meteorite were achieved at several temperatures between...body. 1. Introduction T h e J o h n s t o w n meteorite has been the subject of several petrological a...l o r a n et al. [1] d e t e r m i n e d the meteorite to be a diogenite, that is a brecciated o r t |  | | Journal (article/letter/editorial) | | ranging from <10 wt% for Moama to ~30 wt% for Moore County were involved. The origin of diogenites is more...basaltic rocks composed mainly of plagioclase and pigeonite. Diogenites are essentially composed of orthopyroxene... 1767 © Meteoritical Society, 2004. Printed in USA. 1768 Jean-Alix Barrat trapped melt was sealed...coefficients between the cumulus phases (plagioclase, pigeonite, orthopyroxene) and the melt are established relatively...the LREE enrichments of the phases of the Moore County cumulate eucrite, which leads to erroneous calculations |  | | Journal (article/letter/editorial) | | Copyright @Z1994 Elsevier Science Ltd Printed in the USA. All rights reserved 0016-7037/94$6.00 + .OO The...Sciences Co., 2400 Nasa Road I, Houston, TX 77058, USA (Received Muy 6, 1993; accepled in rrvised,forrn...orthopyroxene clasts, one plagioclase clast from Johnstown and two large chromite grains from Shalka were...Ellemeet LL Garland USNM #2140 lbbenboren Johnstown USNM #2828 Me #2059 LEW88008 Manegaon ,9 BM(NH)...(Smithsonian Institution); Antarctic diogenites from Meteorite Working Group. 1 Genesis of diogenites I539 |  | | Journal (article/letter/editorial) | | and the identity of the MgjCr ratio in the two meteorite groups is established, provided Chaves is treated...indicative of the genetic link between these three meteorite classes. The silicate fractions of nine mesosiderites...ofa eucritic liquid of the composition of Sioux County yields a residual liquid similar to Nuevo Laredo;...Juvinas; MC - Moore County; MO - Moama (Lovering, 1975); PS - Pasamonte; SC - Sioux County;SM - Serra de Mage;...Ellemeet; G - Garland; IB - Ibbenbiiren; IT - Johnstown; R - Roda; S - Shalka;T - Tatahouine;YB - Yamato |  | | Journal (article/letter/editorial) | | EVOLUTION AND THE THERMAL OF THE STEINBACH METEORITE ARCH M. REID, RICHARD J. WILLIAMS and HIROSHI...TAKEDA NASA Johnson Space Center, Houston, Texas (USA) Received June 6, 1973 Revised version received...received February 18, 1974 Steinbach is a stony-iron meteorite with approximately equal amounts of silicate and...700-500°C range. 1. Introduction The Steinbach meteorite was found in 1724 but may have fallen around 1...as 1164 [1]. Heide [2] described this unique meteorite that consists of nickel iron and silicate in approximately |  | | Journal (article/letter/editorial) | | Geosciences, University of Arizona Tucson, AZ 85721, USA M. C. Domeneghetti CNR-Centro di Studio per la Cristallochimica...nonuniform within large orthopyroxene (inverted pigeonite) grains, some of which had small domains free...exsolved augites in an orthopyroxene (inverted pigeonite) is 42%. To ensure the accuracy of the site occupancy...M2 sites of an orthopyroxene crystal from Johnstown meteorite. An average of 55 spot analyses for which...with Fe2`/(Fe2`#Mg) ratio similar to that in the Johnstown sample. The latter workers determined the site |  | | Journal (article/letter/editorial) | | were taken from large clasts in the diogenites Johnstown (En,,) and Tatahouine (En& and the mesosiderites...the eucrites and shergottites. The problem of meteorite kinship becomes more difficult when clasts in...clasts in howardites and these three types of meteorite institute the majority of the achondrites. Mesosiderites...coolants. The diogenites Tatahouine USNM 5289 and Johnstown AMNH 2497. and the mesosiderites EstherviJle USNM...(NORD, pers. commun., 1982). The orthopyroxene in Johnstown is En72-74(FLORANef al., 198I I The samples were |  | | Journal (article/letter/editorial) | | 2% TiO2 and 10% A1,O3) in the Angra des Reis meteorite, meteoritic OH' .o A M~Z $1206 C . E . ...orthopyroxene in achondrites and mesosiderites; M : pigeonite in achondrites and mesosiderites; N : augite in...specifically between the two pyroxenes. In the Woodbine meteorite the orthopyroxene contains about 3% (by weight)...the least-rccrystallized group is the Chainpur meteorite, described in considerable detail by Keil et al...calcium-poor clinopyroxene crystals from this meteorite, with the results shown in Fig. 7. 52 28 28 |  | | Journal (article/letter/editorial) | | forsttrite pure, proviennent aussi d’un apport de meteorite carbon&e. ‘(------l MnO R- 47.6 - 13 / 7...mineures associee a l’orthopyroxbne (Fs 23-25) dans Johnstown (Floran et al., 1977); Reid (1980) a observe de...eucrites seraient issues du fractionnement mod&e de pigeonite et plagioclase 2 partir de liquides primaires...partielle d’un assemblage compose d’olivine (Fa 35), pigeonite (Wo 5, Fs 351, plagioclase (An 94), spinelle riche...Mage, la vaieur 34 caracterise uniquement Moore County et Nagaria, les autres eucrites de ce type (Serra |  | | Journal (article/letter/editorial) | | (1992) © Meteoritical Society, 1992. Printed in USA Minor/major element variation within and among diogenite...14063, USA 'Mathematics and Computer Science, SUNY, College at Fredonia, New York 14063, USA JOHN (Received...for Manegaon are From Fredriksson (1982), for Johnstown from Floran et al. (1981) and Fredriksson et al...microprobe. ALHA77256,7 and ALHA77256,62- This meteorite is very coarse grained (opx 5-6 mm dia.), with...was described as a diogenite in the Antarctic Meteorite Newsletter (1986). TABLE 3b. Electron microprobe |  | | Journal (article/letter/editorial) | | (2000) 0 Meteoritical Society, 2000. Printed in USA Petrology and geochemistry of the Elephant Moraine...Code C23,2400 Nasa Road 1, Houston, Texas 77058, USA Author's e-mail address: david.w.mittlefehldt1 @jsc...higher Ni, Co, and Se compared to light samples. Meteorite EETA79002 appears to contain material from three...contain material that is foreign to the bulk of the meteorite. A chondritic clast was found in Ellemeet by...(Mittlefehldt, 1994). Plagioclase mineral fragments in Johnstown have trace element contents that indicate that |  | | Journal (article/letter/editorial) | | intracrystalline Fe2+ , Mg exchange reaction in Johnstown meteoritic orthopyroxene Rolf HEINEMANN1 , Herbert...order/disorder process in orthopyroxenes from the Johnstown meteoritic diogenite is extremely slow. It is...with data previously obtained on non-homogenized Johnstown orthopyroxenes (Heinemann et al., 2000) shows...KD relations, the cooling rate of the original Johnstown orthopyroxenes was calculated from the Mueller...cation ordering, kinetics, cooling rate, Johnstown meteorite. Introduction Orthopyroxene cation geospeedometry |  | Cordier, Carole, Suavet, Clément, Folco, Luigi, Rochette, Pierre, Sonzogni, Corinne (2012) HED-like cosmic spherules from the Transantarctic Mountains, Antarctica: Major and trace element abundances and oxygen isotopic compositions. Geochimica et Cosmochimica Acta, 77. 515-529 doi:10.1016/j.gca.2011.10.021 | Journal (article/letter/editorial) | | strongly depleted in LREE and are related to pigeonite-rich equilibrated eucrite fragments. Type 3 spherules...Massachusetts Avenue, Cambridge, MA 02139-4307, USA. 0016-7037/$ - see front matter Ó 2011 Elsevier...asteroids, i.e. asteroids that are not represented in meteorite collections (Gounelle et al., 2009; Badjukov et...and Sun, 1995). Light gray pattern is for (b) pigeonite En36Wo10 and (c) orthopyroxene En73Wo2.5 (Table...spherules deriving from precursors with (b) 60–90% of pigeonite and (c) 80–90% of orthopyroxene. 0.1 0.0001 |  | | Book | | obtain a panorama of the scope and substance of meteorite research. I endeavored to remedy this situation...not exhaustively discussed—the great upsurge in meteorite research along many new lines in recent years...and conservation of meteoritic material. Every meteorite is to some degree unique; and meteorites, unlike...I not been favored bv the curatorship of the meteorite collection of The American Museum of Natural History...Chicago Natural History Museum, the Nininger Meteorite Collection (Arizona State University, Tempe), |  | MAYNE, Rhiannon G., SUNSHINE, Jessica M., McSWEEN, Harry Y., McCOY, Timothy J., CORRIGAN, Catherine M., GALE, Allison (2010) Petrologic insights from the spectra of the unbrecciated eucrites: Implications for Vesta and basaltic asteroids. Meteoritics & Planetary Science, 45 (7) 1074-1092 doi:10.1111/j.1945-5100.2010.01090.x | Journal (article/letter/editorial) | | 76109, USA 2 Department of Astronomy, University of Maryland, College Park, Maryland 20742–2421, USA 3 Department...University of Tennessee, Knoxville, Tennessee 37996–1410, USA 4 Department of Mineral Sciences, Smithsonian Institution...History, Washington, District of Columbia 20560–0119, USA 5 Department of Earth and Planetary Sciences, Harvard...20 Oxford Street, Cambridge, Massachusetts 02138, USA * Corresponding author. E-mail: r.g.mayne@tcu.edu...thought to be a zone for dynamically favorable meteorite delivery to Earth. If this proposed relationship |  | | Journal (article/letter/editorial) | | main gtoup palfasites and IIIAB irons. These meteorite groups appear closely related based (m composition...petrogenetic processes may have produced these meteorite types from similar starting compositions. This...This grouping does not imply that all these meteorite types are from a single parent body, although this...large datafile’haa been compiled ofwhole iack meteorite and c&t analyses of eucr&s, polymict eucritea...the AHIR elements in olivine, orthopyroxene, pigeonite, augite and plagioclase, significant fractionations |  | | Journal (article/letter/editorial) | | (1997) 8 Meteoritical Society, 1997. Printed in USA. Meleorilics Transmission electron microscope texture...performed on clinopyroxene, orthopyroxene and pigeonite. The (100) twin lamellae in the clinopyroxene...also revealed interstitial Na-rich glass and pigeonite with sharp h+k odd reflections and rare stacking...mainly consist of coarse-grained olivine and pigeonite enclosed in a carbonaceous matrix with minor amounts...grains of orthopyroxene, clinopyroxene, olivine, pigeonite and glass, using a CM12 Philips electron microscope |  | | Journal (article/letter/editorial) | | Copyright © 1998 Elsevier Science Ltd Printed in the USA. All rights reserved 0016-7037/98 $19.00 1 .00 Pergamon...California, San Diego, La Jolla, California 92093-0212, USA 2 Max-Planck-Institute for Chemistry, Cosmochemistry...late nebula. These studies have shown that all meteorite groups investigated so far have excess 53Cr relative...uncertainties at the same time when high temperature meteorite inclusions (CAI) were formed in the nebula. The...elements, including Cr, in the interior of the iron meteorite Grant. The production rates for 53Cr and 54Cr |  | | Journal (article/letter/editorial) | | Kinetics of Fe2+-Mg order-disorder in P21/c pigeonite M. CHIARA DOMENEGHETTI,* MICHELE ZEMA, AND VITTORIO...Fe-Mg intracrystalline exchange reaction in P21/c pigeonite (Wo10En47Fs43) free of exsolved augite, from the...very fast lava cooling. INTRODUCTION 2+ 2+ Pigeonite (Mg, Fe , Ca) (Mg, Fe ) (Si2O6) is a Ca-poor clinopyroxene...extraterrestrial volcanic rocks. At high temperature, pigeonite is monoclinic C2/c but, on cooling, a displacive...Brown et al. 1972; Sueno et al. 1984). In P21/c pigeonite, as well as in Pbca orthopyroxene and C2/c clinopyroxene |  | | Journal (article/letter/editorial) | | this study was extracted from the meteorite fragments of the meteorite collection at the Istituto di Mineralogia...grain size of the mineral phases. In the Jolomba meteorite, for example, it is often impossible to distinguish...yielded one pyroxene single crystal for each meteorite. The three crystals produced sharp diffraction...one of the Jolomba fragments. Since the Jolomba meteorite is composed of breccia fragments and the chondrules...assess whether the crystal extracted from this meteorite was part of a chondrule. The space groups were |  | | Journal (article/letter/editorial) | | Mn2+) between M1 and M2 sites of natural P21/c pigeonite. Suitable crystals free of exsolution textures...structural varieties of pyroxene, such as P21/c pigeonite. For the latter, the only available calibration...geothermometer to pigeonite-bearing rocks. A detailed study of relationships between P21/c pigeonite structure...PASQUAL ET AL.: INTRACRYSTALLINE THERMOMETRY IN PIGEONITE EXPERIMENTAL METHODS The single crystals chosen...effects on the Mg-Fe2+ intracrystalline exchange in pigeonite. Transmission electron microscopy Natural pigeonites |
|
