 | Floran, R.J., Prinz, Martin, Hlava, P.F., Keil, Klaus, Spettel, B., WĂ€nke, 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) | | (1997) 8 Meteoritical Society, 1997. Printed in USA. Cooling rates of diogenites: A study of Fe2+-Mg...on Vesta and the HED Meteorites, Houston, Texas, USA, 1996 October 1618) Abstract-The iron-magnesium...(1982). These ranged between -5 "C/104 year in Johnstown and -0.8 "C/year in Roda. A comparison with other...of Ca compositional gradients and the width of augite lamellae in pyroxenes from different cumulate eucrites...values ranging between 1.6 "C/IO4 year in Moore County eucrite (corresponding to a burial depth of 8 km) |  | | Journal (article/letter/editorial) | | E. University Blvd., Tucson, Arizona 85721â0092, 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 ”m grain |  | | 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...essentially the same meaning as has 'enstatite-augite'. Where lime is appreciable he proposed the term...quite separate from' pigeonite' or ' enstatite-augite'. Very few reliable analyses are available of these...Henderson and H. T. Davies (1936) from the Moore County meteorite. Its greater birefringence than the corresponding |  | | 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...of the crystal showed the presence of very thin augite lameUae and Guinier-Preston zones indicating a...body. 1. Introduction T h e J o h n s t o w n meteorite has been the subject of several petrological a |  | | Journal (article/letter/editorial) | | Pavia, Italy Abstract: Orthopyroxene from the Johnstown diogenite contains exsolution products. It shows...(several unit-cell wide). Additionally, only Johnstown orthopyroxenes contain single unit-cell wide Guinier-Preston...chemically distinct pyroxene and their distribution in Johnstown is pervasive. They are still present after annealing...orthopyroxene crystals of the Johnstown meteorite. Orthopyroxene from this meteorite has been previously studied...who described exsolution products as (i) frequent augite exsolution lamellae several unitcell wide, epitactically |  | | Journal (article/letter/editorial) | | composition Wo4En60Fs36, contains thin exsolved augite lamellae but no Guinier-Preston zones. A series...ânormalâ kinetic behaviour. The presence of Ca and augite lamellae in the orthopyroxene matrix do not seem...observed in the Ca-rich orthopyroxene from the Johnstown meteorite. Key-words: Ca-rich orthopyroxene, order-disorder...disordering in the Ca-rich orthopyroxene from the Johnstown meteorite. This orthopyroxene has the composition Wo3En74Fs23...et al., 1999) and contains both exsolved (100) augite lamellae and abundant GuinierPreston (GP) zones |  | 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 20742â2421, USA 3 Department...University of Tennessee, Knoxville, Tennessee 37996â1410, USA 4 Department of Mineral Sciences, Smithsonian Institution...History, Washington, District of Columbia 20560â0119, 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) | | 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...are however richer in tridymite, phosphate and augite than achondrites (PRINZ et al., 1980) as a result...coolants. The diogenites Tatahouine USNM 5289 and Johnstown AMNH 2497. and the mesosiderites EstherviJle USNM |  | | Journal (article/letter/editorial) | | geothermal temperature field [1-4]. Cooling rates of meteorite parent bodies have been estimated from the study...include hypersthene, olivine and augite from the meteorites Johnstown, Eagle Station and Angra dos Reis...respectively [23,24]. The predominantly fission tracks in augite from Angra dos Reis [25,26] were revealed by etching...(hypersthene) and olivine grains from the meteorites Johnstown and Eagle Station, respectively, are shown in...field for fission tracks in pyroxene (augite) from the meteorite Angra dos Reis. Statistical errors of |  | | Journal (article/letter/editorial) | | Geosciences, University of Arizona Tucson, AZ 85721, USA M. C. Domeneghetti CNR-Centro di Studio per la Cristallochimica...inverted pigeonites with exsolution lamellae of augite. However, the distribution of the exsolved lamellae...sections. Since there are (optically invisible) augite exsolutions in the orthopyroxenes, the analyzed...reflections indicates extremely small amounts (42%) of augite exsolutions. X-ray data collection Single crystal...M2 sites of an orthopyroxene crystal from Johnstown meteorite. An average of 55 spot analyses for which |  | 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) | | producing olivine, and a second stage yielding augite from an evolving silica-rich melt upon ascent (Goodrich...09013634 allocated by the Meteorite Working Group from the Antarctic meteorite collections were used for...Co, AZ) USNM 111312/444 Ni; Hypersthene (Johnstown Meteorite) USNM 746 â Cr. The following standards were... Ni; Kakanui Augite (New Zealand) USNM 122142-Ca, Al; Hypersthene (Johnstown Meteorite) USNM 746 â Cr;...Hornblende (New Zealand) USNM 143965 â Fe, Ti Kakanui Augite (New Zealand) USNM 122142 â Ca, Mg, Al, Si; Fayalite |  | | Journal (article/letter/editorial) | | meteorites to estimate the cooling history of the Johnstown diogenite (Molin et al., 1991). Similar information...is the most abundant silicate mineral in the meteorite, in both chondrules and matrix. A single optically...orthopyroxene of the Zaoyang chondrite and the Johnstown diogenite, according to the calibration of Molin...metamorphic ranges (closer to the volcanics), while the Johnstown diogenite plots in the metamorphic range, as expected...temperature of the Zaoyang clinopyroxene with that of the augite of Vulcano Island used for CHONDRITE COOLING |  | | 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 |  | | 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 MagĂ© might have re-equilibrated with...mineral phases for four cumulate eucrites (Moore County, Moama, Serra de MagĂ©, and Binda) were determined |  | | Journal (article/letter/editorial) | | (1997) 0 Meteoritical Society, 1997. F'rinted in USA. Equilibrated ordinary chondrites: Constraints for...TABLE1. Meteorites used for this study. Meteorite Meteorite Selection Unshocked, or very mildly shocked...spectrometer (EDS). From 0.2-0.5 g subsamples of each meteorite, one to four double-polished 100 p m thick sections...selected were actually representative of the meteorite (e.g., exotic clasts were not encountered). In...from LL-chondrites used for SCXRD analyses. meteorite sample PS# Acfer 299 A299-1 PPCC A299-3 PPC |  | | 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) | | 2% TiO2 and 10% A1,O3) in the Angra des Reis meteorite, meteoritic OH' .o A M~Z $1206 C . E . ...pigeonite in achondrites and mesosiderites; N : augite in achondrites and mesosiderites; P: diopside in...Ilypersthene Olivine Olivine, cllnobronzlte, nickel-iron Augite Diopside, olivine Pyroxene, plagioclase Stony-irons...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 |  | | Journal (article/letter/editorial) | | microclineâ K2O (all phases) Black Rock Summit chromium augite⥠SiO2 (cpx), Al2O3 (ol, cpx, opx), FeO* (cpx),...Al2O3 (spn) Johnstown Meteorite hypersthene SiO2 (opx), FeO* (opx), MgO (opx) Kakanui augite Al2O3 (glass)...used to test primary peridotite standards Johnstown meteorite hypersthene Accepted value* Analyzed s.d...E., Gooley, R., and Husler, J. (1987) Chromium augiteâa new microprobe reference sample. Geostandards |  | | 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 datafileâhaa been compiled ofwhole iack meteorite and c&t analyses of eucr&s, polymict eucritea...elements in olivine, orthopyroxene, pigeonite, augite and plagioclase, significant fractionations of |  | Molin, G., Domeneghetti, M.C., Salviulo, G., Stimpfl, M., Tribaudino, M. (1994) Antarctic FRO90011 lodranite: Cooling history from pyroxene crystal chemistry and microstructure. Earth and Planetary Science Letters, 128 (3) 479-487 doi:10.1016/0012-821x(94)90164-3 | Journal (article/letter/editorial) | | to reconstruct the evolutionary history of the meteorite parent body. The structural behaviour of orthopyroxene...10°C/day near the Tc. Clinopyroxene is a low-iron augite ( E n s 1 F s s W o 4 4 ) . Clinopyroxene Fe2+-Mg...body. 1. Introduction T h e F R O 9 0 0 1 1 meteorite was found during the 1990-1991 E U R O M E T /...together with acapulcoites, constitute a rare meteorite group which u n d e r w e n t partial silicate...evolutionary history of the parent body of a given meteorite can be modelled once its cooling history has been |  | | Journal (article/letter/editorial) | | 98.98); terrestrial enstatite (En 86.61); and Johnstown, a diogenite whose orthopyroxene is En 71.92....oxidation of pure iron or troilite (FeS) after the meteorite fell, or else during sample preparation. Features...by oxidized iron observed in these and other meteorite spectra should not be found in reflectance spectra...maximum at 750 nm and a minimum at 500 nm). This meteorite contains 23.2% nickel-iron metal and 9.7% troilite...very small amounts (~<1%) in Bishopville and Johnstown. The presence of these minerals in St. Mark's |  | | 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) | | (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) | | forsttrite pure, proviennent aussi dâun apport de meteorite carbon&e. â(------l MnO R- 47.6 - 13 / 7...mineures associee a lâorthopyroxbne (Fs 23-25) dans Johnstown (Floran et al., 1977); Reid (1980) a observe de...materiaux d~og~nitiques) et probabIcmellt augite et ferro-augite (ayant un Kn FeO/MnO (pyroxene/liquide)...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 |
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