 | | Journal (article/letter/editorial) | | THE COMPOSITION OF THE JOHNSTOWN METEORITE Brian Mason and E. Jarosewich Smithsonian Institution, Washington...Washington A new analysis of the Johnstown meteorite, a hypersthene achondrite, gives the following results...in the bulk meteorite and in the pyroxene are presented in tabular form. This meteorite fell near Johnstown...town in north-central Colorado, on July 6, 1924. It is the largest hypersthene achondrite known, and...far exceeds the combinedweight of all other hypersthene achondrites. It was described by Hovey (1925) |  | 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) | | quite inconclusive, because many sections of hypersthene show extinction-directions oblique to the trace...as having the same optical properties as the hypersthene which accompanies it, except that in the former...the symmetrical zone. I n describing the Johnstown meteorite, E. 0. Hovey (1925) gives some data and an...and its other properties agree with those of hypersthene, so the lamellar structure is probably that which...Service (1934) has since been identified as hypersthene, the inclined extinctions and lamellar appearance |  | | Journal (article/letter/editorial) | | characteristic of the various iron compounds in the meteorite. By comparison with absorption patterns of terrestrial...determined. The minerals idont~ified in the Plainview meteorite wcrc olivine and pyroxenc (forromagncsian silicates)...The absorption patterns of the Holbrook and ,Johnstown meteor&es were A0 investig&cd. INTRODUCTION analysis...inferences eoncerning the evolution of the parent meteorite bodies may be deduced from the relative proportions...metal, silicate, and sulfide phases of a st~one meteorite, with subsequent chemical analysis of the iron |  | | Journal (article/letter/editorial) | | and Ni cent (probably weight percent) in the Johnstown mehave been conductedon the metallic particlesin...different from those usually used by mineralogists; hypersthene in meteoritic terms contains more than 20 percent...GOOLEYAND C. B MOORE 2 polished sections each of Johnstown and Tatahouine, and 3 polished sectionseach of...Ibbenbiiren, Roda, and Shalka. Hand specimensof Johnstown, Shalka, and Tatahouine were availablefor representative...those in the larger pyroxene clasts from the same meteorite. Both troilite and chromite Ftc. 2. Planes of |  | | Journal (article/letter/editorial) | | 773 0.018 3.88 88.2 1, Enstatite, Shallowater meteorite (Hess and Phillips, 1940). 2, Enstatite, Espedalen...Hanover, Cape (this paper). 8, Johnstown meteorite (Hovey, 1925). 9, Hypersthene, Naln, Labrador (Washington...Komagatakd, J a p a n (KJzu, 1934). 12, Hypersthene, Summitvflle, Colorado (Larsen, Irving, and Gonyer, 1936)...Odawara-mati, J a p a n (Kuno, 1938). 14, and 15, Hypersthene, Quflquox, Aberdeenshia'e (Walls, 1935). 16,...1935). 17, Iron-hypersthene, Vittinki, Finland (Saxdn, 1925 ; ]~enry, 1935). 18, Hypersthene, Loeh Duieh |  | | Journal (article/letter/editorial) | | analysis of the enstatite from the Shallowater meteorite, and for giving us some of the powder from which...specimens:Webster bronzitel Johnstown meteorite hypersthene; Nain Labrador hypersthene. Cnvsrar,r,ocRApHrcOnrrNrarroN...6 100.00 100.00 1. Enstatite, Shallowater meteorite. Analyst W. F. Foshag. No impurities. 2. Enstatite...& M erwin, Am. Mineral., 8,63-64 (1923). 11. Hypersthene, Nain, Labrador. Analyst Washington, No impurities...B u I l 4 r ( 1 9 3 6 ) . 10. Hypersthene, Johnstown meteorite, Colorado Analyst E. V. Shannon No impurities |  | | Journal (article/letter/editorial) | | depth MANY authors have searched for clusters of meteorite (WRIGHT et al., 1973; SCHULTZ et al., 1973). These...to cluster near 20 Myr again the size of the meteorite (HERZOG and CRESSY, 1974; indicating only a small...clivity to leak helium. The “Ne content of a meteorite sample reflects its previous location in the parent...possible to improve the caltwo samples of each meteorite are reported. culation of cosmogenic exposure...918 NMNH 2140 0.102 84.1+3.8 Me 1554 2.0 Johnstown 40.5 Manegaon Ref -- 67.2t2.4 1 Me 1632 |  | 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) | | (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) | | geothermal temperature field [1-4]. Cooling rates of meteorite parent bodies have been estimated from the study...Minerals studied include hypersthene, olivine and augite from the meteorites Johnstown, Eagle Station and Angra...Reis respectively. Fossil cosmic ray tracks in hypersthene and olivine were revealed by etching these minerals...properties in pyroxene (hypersthene) and olivine grains from the meteorites Johnstown and Eagle Station, respectively...fission tracks in pyroxene (augite) from the meteorite Angra dos Reis. Statistical errors of individual |  | | Journal (article/letter/editorial) | | Orthopyroxenite clasts of been generally recognized. Johnstown (FLORANet al., centimeter size are found, but...and other orthopyroxene compositions for the Johnstown dioelements are present in very small amounts...the average FeO/MnO ratio for olivine in this meteorite is only 32. With the possible exception of a few...than olivine orthopyroxenites. Acknowledgements-Meteorite thin sections were kindly made available by R...petrology and trace element geochemistry of the Johnstown meteorite: a brecciated orthopyroxen$e with a chondriiic |  | | 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...mOnOmineraliC igneous meteorites composed of >90% hypersthene, with minor olivine and chromite and traces of...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) |  | | 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 |  | | Book | | ADDIE D. NININGER A Publication of the American Meteorite Museum Winslow, Arizona . 1950 Astronomical...to the manner in which it has come into being. Meteorite collections are of value in proportion as they...and college officials, teachers, and students; county agents and farm organizations; editors, newscasters...George D. and Ruth M. Thompson of the American Meteorite Museum staff for their assist ance in compiling...in its twenty-seventh year. In some ways, the meteorite collection of H. H. and Addie D. Ninin ger differs |  | | 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 . ...in bronzite chondrites; F: orthopyroxene in hypersthene chondrites; G : diopside in chondrites and in...Enstatite (I l) Olivine-bronzite (227) Olivine-hypersthene (303) Carbonaceous (31) Enstatite, nickel-iron...nickel-iron Olivine, bronzite, nickel-iron Olivine, hypersthene, nickel-iron Serpentine, olivine Achondrites...specifically between the two pyroxenes. In the Woodbine meteorite the orthopyroxene contains about 3% (by weight) |  | | 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...studied here are dominated by orthopyroxene (hypersthene) but also contain variable amounts ofCr-spinel...microprobe. ALHA77256,7 and ALHA77256,62- This meteorite is very coarse grained (opx 5-6 mm dia.), with |  | | Journal (article/letter/editorial) | | (1996) © Meteoritical Society, 1996. Printed in USA. Unshocked equilibrated H-chondrites: A common low-temperature...importance to define the thermal models of the meteorite parent body (i.e., accretionary history, structure...provide significant constraints on the structure of meteorite parent bodies. So far, systematic estimates of...cation ordering thermal records. EXPERIMENTAL Meteorite Selection In meteorites, shock deformation constitutes...numerous polished thin sections from various meteorite collections, we eventually selected eight equilibrated |  | Dottin, James W., Labidi, Jabrane, Farquhar, James, Piccoli, Philip, Liu, Ming-Chang, McKeegan, Kevin D. (2018) Evidence for oxidation at the base of the nakhlite pile by reduction of sulfate salts at the time of lava emplacement. Geochimica et Cosmochimica Acta, 239. 186-197 doi:10.1016/j.gca.2018.07.029 | Journal (article/letter/editorial) | | 09013634 allocated by the Meteorite Working Group from the Antarctic meteorite collections were used for...(Gila Co, AZ) USNM 111312/444 Ni; Hypersthene (Johnstown Meteorite) USNM 746 – Cr. The following standards...(New Zealand) USNM 122142-Ca, Al; Hypersthene (Johnstown Meteorite) USNM 746 – Cr; Fayalite (Rockport...(Gila Co, AZ) USNM 111312/444 – Ni; Hypersthene (Johnstown Meteorite) USNM 746 – Cr. For magnetite analyses...multiple parts in order to maximize the area of the meteorite analyzed. Dimensions for the X-ray maps have been |  | | Journal (article/letter/editorial) | | 2257 lo 2270 8 Pergamon Press Ltd. 1983. Printed m USA 00lh-7037/R3/1???57-14$03.00/0 Aubrites and diogenites:...Institute, University of Chicago, Chicago, IL 60637, USA (Received August 5, 1983; accepted in revisedfi)rm...volatile, and lithophile trace elements. Both meteorite classes show a typically igneous siderophile element...to -0.05X Cl, it apparently represents a new meteorite class. Three diogenites analyzed for REE show...be igneous differentiates that formed in the meteorite parent bodies from more primitive material. WASSON |  | | Journal (article/letter/editorial) | | cpx, opx, spn) Corundum Al2O3 (spn) Johnstown Meteorite hypersthene SiO2 (opx), FeO* (opx), MgO (opx) Kakanui...accurately the compositions of secondary olivine, hypersthene, and basalt standards (Table 3). The range of...test primary peridotite standards Johnstown meteorite hypersthene Accepted value* Analyzed s.d. n 4 SiO2 |  | | Journal (article/letter/editorial) | | ranging from <10 wt% for Moama to ~30 wt% for Moore County were involved. The origin of diogenites is more... 1767 © Meteoritical Society, 2004. Printed in USA. 1768 Jean-Alix Barrat trapped melt was sealed...the LREE enrichments of the phases of the Moore County cumulate eucrite, which leads to erroneous calculations...that the cumulate eucrites Binda, Moama, Moore County, and Serra de Magé might have re-equilibrated with...mineral phases for four cumulate eucrites (Moore County, Moama, Serra de Magé, and Binda) were determined |  | | 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), |  | | 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...Mage, la vaieur 34 caracterise uniquement Moore County et Nagaria, les autres eucrites de ce type (Serra...(3)(4)(5) (7)19)flO) 27,6 (11) Pomozdino Sioux County 33,6 (3)(b)(7) Eucrites StannEXn Diog&ites 34... Allan Hills A76005 36,3 (14) Medanitos Moore County wama Nagaria Serra de Mag6 27,8 33,4 29,7 34,4 |
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