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| that, during partial melting of some asteroidal meteorite parent bodies, explosive pyroclastic volcanism...the precursor materials of these magmatic iron meteorite groups were similar in composition to unequilibrated...meteorites in the world's collections, some asteroidal meteorite parent bodies must have experienced complex processes...sufficient volatiles, and if some of the igneous iron meteorite groups originated on bodies having similar starting...by the Center for Meteorite Stdies, Arizona State University, and samples of Semarkona and Sharps by the |
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| 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 |
 | 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...(1989) studied magnetite-metaltroilite-cohenite-graphite nodules in the Study Butte H chondrite regolith...pentlandite was originally described in LL3.0 Semarkona, LL3.7 ALHA77278, and LL3.2/3.7 Ngawi (Taylor...carbidization of metal-troilite assemblages (reaction with graphite or gaseous CO or CH4 to form cohenite and haxonite)...Hutchison et al. (1987) described carbide veins in Semarkona matrix and a carbide that might be intermediate |
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| accepted idea that chondritic Fe was reduced by graphite. The mineralogies of unequilibrated (type 3) chondrites...first have been reduced through reaction with graphite at the onset of metamorphism, although there are...appropriate for types 4-6 chondrites, the activity of graphite may have been lowered by its dis~lution in taenite;...to have been well within the stability field of graphite, precluding its reaction. At these temperatures...because of the high precision and large number of meteorite analyses. However, the occurrence of three systematic |
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| be synthesized in reducing conditions by adding graphite or diamond into precursory silicate dust [8,9...experiments we added 3 mg of carbon in the form of graphite powder into starting materials. A vacuumed quartz...the load current was from 0 to 10 A. A hand-made graphite crucible (3.5 and 5 mm in inner and outer diameters...its bottom was supported by an alumina tube on a graphite base plate. Glass fiber thermowool was stuffed...from a peak temperature. Geomagnetic field. Added graphite in the starting materials. 296 M. Uehara, N |
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| the transmission electron microscope (TEM) to meteorite studies, mineralogical investigations of carbonaceous...single grain ofâ well-crystallized graphite was observed. The graphite surrounds a kamacite grain in matrix...described the occurrence of hydrous silicates in the Semarkona LL3 chondrite and observed that the ferromagnesian...magnetite in the matrix. The alteration assemblage in Semarkona is more similar to Mokoia than to Lance. Bishunpur...obtained with funds provided by the Earth Science division of the NSF (Grant #EAR8408 163). Editorial bundling: |
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| 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 UOCâby far...that fine-grained chondrule rims and matrix in Semarkona could be the source of smectite-rich IDPs is not |
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| increasing metamorphic grade of a given chemical meteorite type, FeO/MgO ratios in olivine and pyroxene increase;...metamorphism were reducing until temperatures at which graphite would dissolve into metal were reached. A study...metal-rich materials, with euhedral enstatite, graphite and sinoite. Rubin and Wasson (2011) suggested...Concord 3.2 3.4 3.6 3.8 4 5 6 LL chondrites Semarkona Bishunpur Chainpur Parnallee LAR 06674,4 Hamlet... 1180-3; Lost City, 4848-3; Guarena, 1469-3; Semarkona 1805-18; Bishunpur 2359-1; Chainpur, 1251-16; |
 | Ali, Arshad, Nasir, Sobhi J., Jabeen, Iffat, Al Rawas, Ahmed, Banerjee, Neil R., Osinski, Gordon R. (2017) Chemical and oxygen isotopic properties of ordinary chondrites (H5, L6) from Oman: Signs of isotopic equilibrium during thermal metamorphism. Meteoritics & Planetary Science, 52 (10) 2097-2112 doi:10.1111/maps.12910 | Journal (article/letter/editorial) |
| types. A numerical scale 3 to 6 is assigned to a meteorite to represent the degree of thermal metamorphism...OCs documented so far (3,495). Ten out of 24 meteorite samples included in this study are of H5 and the...ordinary chondrite (EOC) meteorite samples analyzed in the present study. Class Meteorite H5 JaH 877 JaH 881...metaborate/lithium tetraborate in high-purity graphite crucibles covered with graphite lids in an induction furnace....1984; Sears and Weeks 1986) by carbon (either as graphite or CO gas) and oxidation of equilibrated chondrites |
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| was further strengthened by the large Allende meteorite fall in 1969 with its abundant calcium-aluminum-rich...and Mason and Wiik (1962), and for the other meteorite classes from Wasson and Kallemeyn (1988). primitive...2003; Bonal et al. 2004). In the OCs, compared to Semarkona (LL3.0), Bishunpur (L/ LL3.1) and Krymka (LL3...IOM, respectively (Alexander et al. 1998). Even Semarkona has experienced some metamorphism (Grossman and...1993), with a similar degree of metamorphism to Semarkona (Grossman and Brearley 2005), but its bulk alkali |
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| Printedin U.S.A. + .oO The microstructure of Semarkona and Bishunpur C. M. OâD. ALEXANDER,â* D. J. BARBER...24, 1989) Abstract-The ordinary chondrites, Semarkona and Bishunpur, appear to have experienced in situ...examination of them, which supports this conclusion. In Semarkona, all but the most magnesian mafic minerals have...composition of the gas present during the alteration of Semarkona was not solar but was dominated by H20. The formation...grain-boundary fluid present. The alteration in Semarkona and Bishunpur is far from complete. Thermodynamic |
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| porphyritic olivine compound chondrule from LL3.0 Semarkona that experienced limited remelting Alan E. RUBIN...April 2006) AbstractâChondrule D8n in LL3.0 Semarkona is a porphyritic olivine (PO) chondrule, 1300...with low-FeO overgrowths in the LL3.0 chondrite Semarkona. The chondrule contains metal blebs (formed by...I examined thin section AMNH 4128-2 of LL3.0 Semarkona in transmitted light and in backscattered electron...porphyritic olivine compound chondrule from LL3.0 Semarkona 1029 1030 A. E. Rubin o Fig. 2. BSE images |
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| carbides (Krot et al., 1997). Evidence from LL3.0 Semarkona that water moved through the matrix into chondrules...high-ï17O composition of magnetite grains in LL3.00 Semarkona, L3.05 EET 90161, LL3.6 Ngawi and other type-3...temperatures ranging from 200 - 260ÂșC for type-3.00 Semarkona (Alexander et al., 1989; Huss and Lewis, 1994)...those of the most unequilibrated OC (e.g., LL3.00 Semarkona, LL3.15 Bishunpur, LL3.2 Krymka; Takagi, 2005;...PCA 91002 contains 0.3 vol.% magnetite, this meteorite is paired with PCA 91241 and all the magnetite |
 | Davidson, Jemma, Busemann, Henner, Nittler, Larry R., Alexander, Conel M.OâD., Orthous-Daunay, François-RĂ©gis, Franchi, Ian A., Hoppe, Peter (2014) Abundances of presolar silicon carbide grains in primitive meteorites determined by NanoSIMS. Geochimica et Cosmochimica Acta, 139. 248-266 doi:10.1016/j.gca.2014.04.026 | Journal (article/letter/editorial) |
| extracted from primitive members of different meteorite groups. We show that presolar SiC abundance determinations...differences between primitive members of other meteorite classes, which did not experience such high temperatures...scale, the material that accreted to form the meteorite parent bodies was physically and chemically heterogeneous...distribution of presolar grains throughout the meteorite-forming regions of the early Solar System, and...within meteorite classes. Presolar grains (including silicates, oxides, nanodiamonds, graphite, and silicon |
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| Name Size (/~m) ~13C (7oo) 815N (%o) Ref. Graphite Diamond SiC SiC SiC ~ Ne-E(L) Xe-HL Xe-S Ne-E(H)...6. TABLE 3 The yields (relative to the bulk meteorite) and the peak isotopic compositions of the heavy...temperatures for carbon and nitrogen are also listed Meteorite (ppm) 2. T e c h n i q u e s Most of the presolar...are greater than petrologic type 3.6 Meteorite and type Semarkona (LL3.0) Bishunpur (L/LL3.1) Krymka (LL3...have been calculated relative to the bulk meteorite. Semarkona Bishunpur Krymka Inman Tieschitz 1.6 1 |
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| them to the metamorphic history of their host meteorite. SulïŹdes 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 â 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 |
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| armalcolite (165) 37 Asia (165) 129 1897 Assam India (167) 269 assimilation (170) 301 Atlantic Ocean...granites (167) 121 granulite facies (171) 607 graphite (171) 607 gravity anomalies (171) 289, (171) 411...inclusions (164) 345, (165) 25, (169) 173 India (171) 7, (171) 607 India-Asia collision (171) 107 Indian Ocean...(169) 37 seismicity (168) 255, (172) 11 Semarkona Meteorite (164) 577 Senegal (173) 413 Sesia-Lanzo Zone...Mountain (171) 95 Yunnan China (165) 1 Zagami Meteorite (173) 397 zircon (164) 409, (169) 291, (171) 591 |
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| compositionally heterogeneous glass from LL3.0 Semarkona Alan E. RUBIN Institute of Geophysics and Planetary...December 2012) AbstractâChondrule 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 |
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| inextricably linked to the formation of its host meteorite. Before the IOM can be used to constraint nebular...as how it was modiïŹed in the solar nebula, on meteorite parent bodies and on Earth, we report the results...weathering stages, abundances of matrix and bulk meteorite insoluble C contents determined in this study...CO3.5 CO3.7 S1 S1 S1 S1 S1 S1, br S1 S1 OC Semarkona QUE97008 MET00526 MET00452 Bishunpur LEW86018...ratios (100·) and isotopic compositions of the meteorite residues C (wt%) H/C (at.) N/C (at.) O/C (at |
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| com/locate/gca A unique omphacite, amphibole, and graphite-bearing clast in Queen Alexandra Range (QUE) 99177:...pargasitic hornblende) and coarse-grained (up to 70 lm) graphite laths. The clast also contains relatively equilibrated...(>6 GPa). Amphibole formation probably postdated graphite formation and occurred by reaction of olivine...because it contains omphacite, amphiboles, and graphite laths. QUE 99177 shows minimal signs of alteration...which could have only been preserved if this meteorite was not subjected to any signiïŹcant thermal metamorphism |
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| Italy NT Chieti NT Marsica AJjsaroka Fault Abee Meteorite aa Taylor County Texas Texas Southwestern U...River IN Index Indian states as applicaÂŹ ble. BT India SA Bihar SA West Bengal Ajman Sheikdom. One of federation...Peninsula Ajmer City and district in central RajaÂŹ sthan, NW India. BT Rajasthan BT India akaganeite BA oxides...Endicott Mountains NA Fairbanks Alaska NA Fairbanks District NT Fairweather Fault NT Glacier Bay NA Glacier...Interior Seaway NX Western Overthrust Belt SA Abee Meteorite SA Altyn Limestone SA Banff Formation SA Bearpaw |
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| near the surface of some chondrules in LL3.0 Semarkona, and silica-rich igneous rims around many type-I...grains derived from disrupted type-IA chondrules. Semarkona chondrule mesostases that show increased concentrations...(FeO-rich porphyritic olivineâPO) chondrules in Semarkona LL3.0 and found that most phenocrysts exhibit...Meteoritical Society, 2018. 2 A. E. Rubin Semarkona, and silica-rich igneous rims around many type-I...ANALYTICAL PROCEDURES Two thin sections of LL3.0 Semarkona (USNM 1805-3 and AMNH 4128-2) were examined microscopically |
 | ALEXANDER, C. M. O'D., RUSSELL, S. S., ARDEN, J. W., ASH, R. D., GRADY, M. M., PILLINGER, C. T. (1998) The origin of chondritic macromolecular organic matter: A carbon and nitrogen isotope study. Meteoritics & Planetary Science, 33 (4) 603-622 doi:10.1111/j.1945-5100.1998.tb01667.x | Journal (article/letter/editorial) |
| closely resembles that now found in Renazzo and Semarkona. These two meteorites have almost M-shaped N isotope...chondrite (Renazzo), five type 3 ordinary chondrites (Semarkona, Bishunpur, Krymka, Inman and Tieschitz) and three...Murchison, Murray and Orgueil), 1-2 g samples of each meteorite were given alternate treatments in 9 M HF/l M...various meteorites studied here. Meteorite Concentration factor Semarkona (LL3.0) Krymka (LL3.1) Bishunpur...influence the first two or three steps, but most meteorite residues released considerably >10-20 ng of C |
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| Bokkeveld suggests that Q1 may be related to presolar graphite. Phases Q1 and 4 2 might be related to the subphases...that the 22Ne-E(L) content, and thus the presolar graphite abundances, are correlated with the metamorphic...(Lewis et al., 1987) or Ne-E in Sic grains and graphite (Amari et al., 1990a; Bernatowicz et al., 1987)...of a common origin of the Q-noble gases in all meteorite classes is based on the characteristic depletion...hand, the method requires large amounts of bulk meteorite to yield a sufficient amount of residue after |
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| from grains that were separated from their host meteorite by harsh acid dissolution. We recently reported...meteorites by Lewis et al. (1987) by dissolving up the meteorite matrix with harsh acids to leave refractory minerals:...minerals: diamond, silicon carbide, corundum, graphite, and others (Amari et al. 1994; Bernatowicz et...disaggregation of the matrix from the Murchison meteorite until it was fully decomposed into its constituent...sources. Ten SiC grains isolated from the Murchison meteorite by our new âgentle separationâ (GS) procedure |
