 | | Journal (article/letter/editorial) | | reacts with SiO2 to form fayalite and secondary kamacite. Analogous processes of magnetite formation and...metal (taenite and tetrataenite) and associated kamacite (Kimura et al., 2008), (11) 4 changes in the...opaque masses have cores of metallic Fe-Ni Jo (kamacite, taenite, tetrataenite) and/or carbide (cohenite...the matrix. In many of the CO3.0-3.1 chondrites, kamacite is more abundant than Ni-rich of metal; tetrataenite...concentrations of Cr (typically 0.1 - 0.4 wt.%; Table 3). Kamacite contains ~3 - 5 wt.% Ni and ~0.4 - 0.7 wt.% Co |  | Krot, Alexander N., Zolensky, Michael E., Wasson, John T., Scott, Edward R.D., Keil, Klaus, Ohsumi, Kazumasa (1997) Carbide-magnetite assemblages in type-3 ordinary chondrites. Geochimica et Cosmochimica Acta, 61 (1) 219-237 doi:10.1016/s0016-7037(96)00336-5 | Journal (article/letter/editorial) | | USA 3Earth Science and Solar System Exploration Division, NASA, Johnson Space Center, Houston, Texas 77058...in L and LL chondrites, Co-rich (up to 35 wt%) kamacite; minor element contents of troilite and magnetite...metal-sulfide nodules. The high Co contents of residual kamacite in association with carbides indicates that Co... Fe/Co is much higher in the carbides than in kamacite). Because Ni in carbides and magnetite is low...(1982) identified haxonite in association with kamacite and taenite in LL3 ALHA79003, L3.6 Khohar, and |  | | Journal (article/letter/editorial) | | than type 3.10 is enriched in Co relative to the kamacite in chondrules. However, Ni-rich metal in type...contains less Co than does kamacite. Fe-Ni metal grains in chondrules in Semarkona typically show plessitic...plessitic intergrowths consisting of submicrometer kamacite and Ni-rich regions. Metal in other type 3 chondrites...composed of fine- to coarse-grained aggregates of kamacite and Ni-rich metal, resulting from metamorphism... Among the known ordinary and CO chondrites, Semarkona is the most primitive. The range of metamorphic |  | | Journal (article/letter/editorial) | | compositionally heterogeneous glass from LL3.0 Semarkona Alan E. RUBIN Institute of Geophysics and Planetary...December 2012) Abstract–Chondrule K7p from LL3.0 Semarkona consists of four nested barred-olivine (BO) chondrules...Mosaic backscattered electron (BSE) image of Semarkona thin section AMNH 4128-2. A grid is superimposed...multilayered barred-olivine (BO) chondrule from the Semarkona LL3.0 ordinary chondrite that sheds light on multiple...to make backscattered electron (BSE) images of Semarkona thin section AMNH 4128-2, on loan from the American |  | | Journal (article/letter/editorial) | | the transmission electron microscope (TEM) to meteorite studies, mineralogical investigations of carbonaceous...and minor chromite occur in Lance matrix, while kamacite is absent. Nirich taenite is in direct contact...matrix using an electron microprobe. The lack of kamacite and the presence of Nirich taenite and minor chromite...In addition to these major phases. fine-grained kamacite (Feg4Ni6), taenite (Fe55Ni45), and a single grain...graphite was observed. The graphite surrounds a kamacite grain in matrix. Unlike Lance, the metal in Kainsaz |  | | Journal (article/letter/editorial) | | porphyritic olivine compound chondrule from LL3.0 Semarkona that experienced limited remelting Alan E. RUBIN...April 2006) Abstract–Chondrule D8n in LL3.0 Semarkona is a porphyritic olivine (PO) chondrule, 1300...fine-grained material consisting of forsterite, kamacite, troilite, and possibly reduced C. The final chondrule...chondrule. At one end of the exterior region, a kamacite- and troilite-rich lump 960 µm in length formed...with low-FeO overgrowths in the LL3.0 chondrite Semarkona. The chondrule contains metal blebs (formed by |  | | Journal (article/letter/editorial) | | Wl6-7037/87/%3.00 + .oO The Semarkona meteorite: First recorded occurrence of smectite in an ordinary...hydrothermally altered. Analyses of Abstract-Semarkona altered materials and opaque matrix are presented...calcite and Na, Fe smectite, respectively. In Semarkona the process possibly requires open system behavior...The low petrologic type previously assigned to Semarkona is the result of retrograde metamorphism, under... of a higher temperature mineral assemblage. Semarkona, and possibly Bishunpur, should be assigned to |  | | Journal (article/letter/editorial) | | of iron-nickel carbides in the matrix of the Semarkona unequilibrated ordinary chondrite LINDSAY P. KELLER...Barringer) Abstract-The fine-grained matrix of the Semarkona unequilibrated ordinary chondrite contains an...postaccretional thermal processing that occurred on the Semarkona parent body. INTRODUCTION The unequilibrated ordinary...of certain matrix materials in the Semarkona chondrite. Semarkona is a UOC fall of low petrographic type...(Hutchison et al., 1987; Alexander et al., 1989). Semarkona is also unusual because of the occurrence of FeNi |  | | Journal (article/letter/editorial) | | time–temperature relation of such finegrained Fe (kamacite) grains suggested that a paleomagnetic data observed...corresponding to that of Fe–Ni alloy of low-Ni (b7 wt.%) kamacite [18,19]. The PO-0 and PO-1 samples with no carbon... e.g. Murchison (CM2), Bishunpur (LL3.1) and Semarkona (LL3.0) [6,7,10,20,24,25], and have also been...diagram for a particular ensemble of single domain kamacite (Fe1−xNix for x ≤ 0.10) from Garrick-Bethell and...estimates are based on Alexander et al. [51] for Semarkona, Rambaldi and Wasson [20] for Bishunpur, Huss |  | Nabelek, Ladislav, Mazanec, Martin, Kdyr, Simon, Kletetschka, Gunther (2015) Magnetic, in situ, mineral characterization of Chelyabinsk meteorite thin section. Meteoritics & Planetary Science, 50 (6) 1112-1121 doi:10.1111/maps.12448 | Journal (article/letter/editorial) | | situ, mineral characterization of Chelyabinsk meteorite thin section Ladislav NABELEK1,2, Martin MAZANEC1...from about 0.3 mm distance between the probe and meteorite surface (resolution about 0.15 mm). Anomalies...in both magnetizing and demagnetizing of the meteorite thin section, while keeping the magnetization...pulses. Bcr of magnetic sources in Chelyabinsk meteorite ranges between 4 and 7 mT. These magnetic sources...made out of the F1 fragment of the Chelyabinsk meteorite that landed in Russia, 15 February 2013 (Borovicka |  | | Journal (article/letter/editorial) | | the olivine/pyroxene ratio, and increases in the kamacite Co and Ni contents. As water (with its heavy O...metallic Fe-Ni, olivine/pyroxene ratio, and average kamacite Co and Ni concentrations (Prior, 1916; Mueller...Rubin 1990) who found that mean olivine Fa and kamacite Co contents increase in each OC group from type-3...fluorescence (F), that is, ZAF corrections. For each meteorite, the centers of unfractured olivine grains ⬎10...metamorphism, there is evidence of oxidation. Semarkona (LL3.0), the least-equilibrated OC fall, contains |  | | Journal (article/letter/editorial) | | chondrites as well as investigating conditions on meteorite parent bodies. Several aspects of ordinary chondrite...ordinary chondrites in an attempt to correlate meteorite mineralogy with asteroid composition from reflectance...the growing interest in aqueous alteration on meteorite parent bodies and observations of phyllosilicates...important when analyzing small and precious pieces of meteorite. Mˆssbauer spectroscopy is capable of detecting...a 57Co source allows the presence of 57Fe in meteorite samples to be analyzed. The energy of the source |  | | Journal (article/letter/editorial) | | 6 unequilibrated ordinary chondrites (UOCs) (Semarkona [LL 3.0], Bishunpur [L/LL 3.1], Krymka [LL 3.1]...that previous studies pointed to the OM in this meteorite as being the most pristine among all chondrites...metamorphic grade: 1) follows the hierarchy Renazzo << Semarkona << other UOCs; 2) is well correlated to the petrographic...discrimination between Renazzo, Semarkona, and other UOCs shows: 1) Semarkona is a very peculiar UOC—by far...that fine-grained chondrule rims and matrix in Semarkona could be the source of smectite-rich IDPs is not |  | Gattacceca, J., Suavet, C., Rochette, P., Weiss, B. P., Winklhofer, M., Uehara, M., Friedrich, Jon M. (2014) Metal phases in ordinary chondrites: Magnetic hysteresis properties and implications for thermal history. Meteoritics & Planetary Science, 49 (4) 652-676 doi:10.1111/maps.12268 | Journal (article/letter/editorial) | | individual meteorites while homogeneous among meteorite subsamples. Except for the most primitive chondrites...properties can be explained by a mixture of multidomain kamacite that dominates the induced magnetism and tetrataenite...poor magnetic recording properties of multidomain kamacite and the secondary origin of tetrataenite make...2003, 2008, 2009), allowing scanning of large meteorite collections for preliminary classification (Folco...significant data set of hysteresis properties for meteorite falls is the report by Terho et al. (1992) that |  | Harju, Ellen R., Rubin, Alan E., Ahn, Insu, Choi, Byeon-Gak, Ziegler, Karen, Wasson, John T. (2014) Progressive aqueous alteration of CR carbonaceous chondrites. Geochimica et Cosmochimica Acta, 139. 267-292 doi:10.1016/j.gca.2014.04.048 | Journal (article/letter/editorial) | | chondrites constitute one of the most primitive meteorite groups. There has been minimal thermal metamorphism:...Wasson and Rubin, 2009). There are additional bulk meteorite properties that correlate to different degrees...representative. A few tens of milligrams of each meteorite were gently crushed using an agate mortar and...binocular microscope. A small amount of each meteorite (5-10 mg) was washed with diluted HCl (6 M), rinsed...porphyritic olivine-pyroxene (POP) chondrule from this meteorite is given in Table 3. The slightly low analytical |  | Bischoff, Addi, Dyl, Kathryn A., Horstmann, Marian, Ziegler, Karen, Wimmer, Karl, Young, Edward D. (2013) Reclassification of Villalbeto de la Peña-Occurrence of a winonaite-related fragment in a hydrothermally metamorphosed polymict L-chondritic breccia. Meteoritics & Planetary Science, 48 (4) 628-640 doi:10.1111/maps.12076 | Journal (article/letter/editorial) | | January 2013) Abstract–The Villalbeto de la Pe~ na meteorite that fell in 2004 in Spain was originally classified...fragments within the Villalbeto de la Pe~ na meteorite clearly bears consequences for the previous classification...Blanca and the anomalous silicate-bearing iron meteorite LEW 86211 than to the ordinary chondrite groups...inclusion is increasing from the fragment/host meteorite boundary (approximately An10) toward the interior...audible booms (Llorca et al. 2005). The first meteorite specimen was found on January 11, 2004, near the |  | | Journal (article/letter/editorial) | | phyllosilicates MARTIN R. LEE1,* and PHILIP A. BLAND2 1 2 Division of Earth Sciences, University of Glasgow, Lilybank...parts of some meteorites, will only occur if the meteorite is especially metal-rich, or has a low primary...but occur in abundance in only one ‘hot’ desert meteorite, Daraj 014. The majority of Fe-rich weathering...concentrations. Here we report results of a study of meteorite terrestrial weathering products using high-resolution...weathering products do not form before the fall of the meteorite. The work reported here has focused on determining |  | | Journal (article/letter/editorial) | | effect is revealed from comparisons of bulk metal (kamacite plus taenite) compositions for H and L chondrites...ordinary chondrites, RUBIN ( 1990) also found that kamacite Ni and Co contents increase with metamorphic grade...because of the high precision and large number of meteorite analyses. However, the occurrence of three systematic...seen in the compilation of JAROSEW~CH ( 1990) of meteorite analyses (Table 1). The metal abundances of JAROSEWICH...concentrations of other siderophile elements in bulk meteorite samples. MORGAN et al. ( 1985) likewise inferred |  | | Journal (article/letter/editorial) | | chondrites WSG 95300 (H3.3, meteorite find) and Parnallee (LL3.6, meteorite fall). Fine grained magnetic...chondrule formation processes) or processes on the meteorite parent bodies (Scott et al., 1981; Nagahara, 1984;...processing in the nebula or, less likely, on the meteorite parent bodies. Similar REE patterns of sulfides...metamorphic and aqueous alteration processes on the meteorite parent body (Becker et al., 2001; Walker et al...behaviour (e.g., terrestrial weathering in case of meteorite finds), however, the causes of these shifts were |  | Jones, Rhian H., McCubbin, Francis M., Dreeland, Linda, Guan, Yunbin, Burger, Paul V., Shearer, Charles K. (2014) Phosphate minerals in LL chondrites: A record of the action of fluids during metamorphism on ordinary chondrite parent bodies. Geochimica et Cosmochimica Acta, 132. 120-140 doi:10.1016/j.gca.2014.01.027 | Journal (article/letter/editorial) | | Mexico, MSC03 2050, Albuquerque, NM 87131, USA c Division of Geological and Planetary Sciences, California...and Ap020 from an unknown pegmatite locality in India. The chemical compositions, including the water...Durango apatite, and a merrillite from martian meteorite QUE94201. 3. RESULTS 3.1. Petrographic observations...Abbreviations: mer = merrillite, ap = chlorapatite, k/t = kamacite/taenite (Fe,Ni metal), tae = taenite, tro = troilite...to the 2% commonly found in aliquots of this meteorite; Pellas, private communication”. However, although |  | | Journal (article/letter/editorial) | | / The halite-bearing Zag and Monahans (1998) meteorite breccias: Shock metamorphism, thermal metamorphism... Ni-rich sulfide, Ni-rich taenite and Co-rich kamacite (Krot et al., 1997; Choi et al., 1998). Recently...Gomes and Keil, 1980; Van Schmus and Ribbe, 1968). Kamacite contains 6.6 ± 0.3 wt% Ni; rare grains of martensite...light-colored clasts. Metal1ic Fe-Ni consists of kamacite with 6.6 ± 0.4 wt% Ni (n = 9), taenite with -20... 131 The halite-bearing Zag and Monahans (1998) meteorite breccias 1-20,um size silicate grains occur in |  | | Journal (article/letter/editorial) | | them to the metamorphic history of their host meteorite. Sulfides in Mighei-like carbonaceous chondrites...consistent with formation during chondrule cooling for Semarkona (LL3.00) and during cooling after thermal metamorphism...High-temperature; Annealing; Aqueous alteration; Meteorite; Chondrite 1. INTRODUCTION As the 10th most abundant...terrestrial ⇑ Corresponding author at: Center for Meteorite Studies, School of Earth and Space Exploration...chondrites, the LL3.00 ordinary chondrite (OC) Semarkona, and returned samples from comet 81P/Wild 2 (e |  | | Journal (article/letter/editorial) | | rights reserved. 1. INTRODUCTION The Renazzo meteorite was first identified as distinct from other carbonaceous...87320,10 and EET 92011,5, both from the Antarctic Meteorite Collection at Johnson Space Center, as well as...meteorites studied. We present results from each meteorite in detail below. 3.1. MAC 87320,10: type-II chondrule...previously reported for the maximum Ni content in this meteorite (Weisberg et al., 1993). The assemblages A1, A2...pentlandite to oxidation of kamacite by aqueous alteration. They suggest that kamacite reacted with water, which |  | | Journal (article/letter/editorial) | | the Ni-poor composition of (Fe,Ni)5C2 in the Semarkona LL3 chondrite (Keller, 1998). Gibbs energy functions...composed of tetrataenite (Fe49.5Co1.4Ni49.1) and kamacite (Fe91.5Co6.3Ni2.2), which forms a quarter sector... The metal part (05-M1) consists of a Co-rich kamacite subgrain (Fe89.6Co7.8Ni2.6) and an internally...RA-QD02-0115.Tae = taenite, Tt = tetrataenite, Kam = kamacite, Hx = haxonite, Mer = merrillite, Ol = olivine...The haxonite is partially overlapping with the kamacite subgrain. was identified as haxonite (Fe23C6; |  | | Book | | METEORITE MINERALOGY Meteorites are fascinating cosmic visitors. Using accessible language, this book...book documents the history of mineralogy and meteorite research, summarizes the mineralogical characteristics...photographs of meteorite minerals, and with an accompanying online list of meteorite minerals, this book...book provides a useful resource for meteorite researchers, terrestrial mineralogists, cosmochemists,...students in these fields. a l a n e . r u b i n is a meteorite researcher who recently retired from the University |
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