 | GOSWAMI, J. N., SAHIJPAL, S., KEHM, K., HOHENBERG, C. M., SWINDLE, T., GROSSMAN, J. N. (1998) In situdetermination of iodine content and iodine-xenon systematics in silicates and troilite phases in chondrules from the LL3 chondrite Semarkona. Meteoritics & Planetary Science, 33 (3) 527-534 doi:10.1111/j.1945-5100.1998.tb01657.x | Journal (article/letter/editorial) | | systematics in silicates and troilite phases in chondrules from the LL3 chondrite Semarkona J. N. GOSWAMI**,S....IPhysical Research Laboratory, Ahmedabad 380 009, India 2McDonnell Center for Space Sciences, Washington...silicates and troilite (FeS) phases in three chondrules from the Semarkona (LL3) meteorite were determined...silicate phases via ion microprobe. The I contents in troilite measured by ion microprobe, however, are prone...microprobe data suggest I content of >1 ppm in troilite, if the calibration from our silicate standard |  | | Journal (article/letter/editorial) | | chondrites contain ~2-8 vol.% magnetite, minor troilite and accessory carbide and chromite; some CO3.1...chondrites contain 1-5 vol.% metallic Fe-Ni, minor troilite, accessory chromite and 0-0.6 vol.% magnetite...Fe-Ni and troilite; in some cases, magnetite and pentlandite occur along with or instead of troilite and metallic...association with other opaque minerals (metallic Fe-Ni, troilite and magnetite). 7 Chromite, when present, occurs...consisting of aggregates of small (<4 µm) grains of troilite, magnetite and metallic Fe-Ni. Spheroidal-to-irregular |  | | 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 |  | 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...to 35 wt%) kamacite; minor element contents of troilite and magnetite are very low. Textural observations...hydrothermal alteration of metallic Fe in metal-troilite nodules by a C-O-H-bearing fluid on their parent...kamacite, troilite, and accessory taenite and pentlandite was originally described in LL3.0 Semarkona, LL3...700 K resulting in formation of troilite, carbidization of metal-troilite assemblages (reaction with graphite |  | | Journal (article/letter/editorial) | | Fractionated sulfur isotopes in sulfides of the Kaidun meteorite HARRYY. MCSWEEN, JR.'*, LEER. RICIPUT12 AND BRUCEA...37996, USA 2Chemistry and Analytical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee...form 1996 September 12) Abstract-The Kaidun meteorite contains carbonaceous chondrite (CM 1) clasts...by ion microprobe, are fractionated compared to troilite in ordinary chondrites. The S in Kaidun sulfides...jackstraw pyrrhotites are unknown from any other meteorite, although uncoated acicular pyrrhotites were noted |  | Prasad, M. Shyam, Rudraswami, N. G., De Araujo, Agnelo, Babu, E. V. S. S. K., Vijaya Kumar, T. (2015) Ordinary chondritic micrometeorites from the Indian Ocean. Meteoritics & Planetary Science, 50 (6) 1013-1031 doi:10.1111/maps.12451 | Journal (article/letter/editorial) | | Institute of Oceanography, Dona Paula, Goa 403004, India LAM-ICP-MS National Facility, CSIR-National Geophysical...Research Institute, Uppal Road, Hyderabad 500007, India * Corresponding author. E-mail: shyam@nio.org ...micrometeorites overlap and extend the range of the known meteorite types, therefore constitute an extremely valuable...et al. 1997) with smaller percentages of other meteorite types in the total flux (Taylor et al. 2007)....carbonaceous chondrites comprise a miniscule ~3% of the meteorite flux (Krot et al. 2003). More recently, micrometeorites |  | | 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 melting...one end of the exterior region, a kamacite- and troilite-rich lump 960 µm in length formed. During the...with low-FeO overgrowths in the LL3.0 chondrite Semarkona. The chondrule contains metal blebs (formed by |  | | Journal (article/letter/editorial) | | kamacite. Fe-Ni metal grains in chondrules in Semarkona typically show plessitic intergrowths consisting... Among the known ordinary and CO chondrites, Semarkona is the most primitive. The range of metamorphic...Acfer 094, a true type 3.00 chondrite, than in Semarkona, which should be reclassified as type 3.01. INTRODUCTION...chondrites, except for bulk metal compositions in Semarkona chondrules (Kimura and Weisberg 2004), and the...the bulk chemical composition of Semarkona chondrules (Grossman and Wasson, 1985). Because CH and CR chondrites |  | | 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) | | 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...chondrites minerals of known Fe content, such as troilite and magnetite, this is not always an option for |  | | Journal (article/letter/editorial) | | ferroan olivine veins and rims (light gra~¢); troilite occurs as veins in pyroxene and as anhedral grains...= ferroan olivine; Opx = low-Ca pyroxene; Tr = troilite; Fe, Ni = metallic Fe-Ni. 406 J.T. Wasson,...and ALHA 77115) are paired with ALHA77011. This meteorite and Sharps have high contents of C-rich aggregates...plagioclase mesostasis, an unidentified Mg-Fe-Si phase, troilite and metallic Fe-Ni. Silica occurs as an- hedral...associated with recognizable metallic Fe-Ni or troilite (troilite-rich Sharps chondrule 20 is the only exception |  | Swindle, T.D, Caffee, M.W, Hohenberg, C.M, Lindstrom, M.M, Taylor, G.J (1991) Iodine-xenon studies of petrographically and chemically characterized Chainpur chondrules. Geochimica et Cosmochimica Acta, 55 (3) 861-880 doi:10.1016/0016-7037(91)90347-8 | Journal (article/letter/editorial) | | Louis, MO 63 130, USA 2Planetary Geosciences Division, Department of Geology and Geophysics, School...chondrules and matrix from the Chainpur (LL3) meteorite to study variations in & the ratio of ‘29Ito r2’I...objects into the rock that became the Chainpur meteorite. Our other objective is to understand whether...of the solar system, during the formation of meteorite parent bodies, is of obvious importance to the...chondrule 5. The sulfides are polycrystalline troilite and appear unaltered. An agate-like sulfide occurrence |  | | Journal (article/letter/editorial) | | Printedin U.S.A. + .oO The microstructure of Semarkona and Bishunpur C. M. O’D. ALEXANDER,“* 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...destroyed, and primary sulphides, most likely troilite, have been partially altered to phyllosilicates...composition of the gas present during the alteration of Semarkona was not solar but was dominated by H20. The formation |  | | 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 |  | | 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...extraterrestrial samples are the pyrrhotite group sulfides troilite [FeS] and pyrrhotite [(Fe,Ni,Co,Cr)1xS], which |  | | Journal (article/letter/editorial) | | Section area (mm2) Points Silicate Metallic Fe-Ni Troilite Chromite Limonite Total ALHA79046 Changde LEW...g cm⫺3): silicate (3.2), metallic Fe-Ni (7.9), troilite (4.67), chromite (4.7), limonite (4.28). a 2...fluorescence (F), that is, ZAF corrections. For each meteorite, the centers of unfractured olivine grains ⬎10...chromite–plagioclase assemblages (cf. Rubin, 2003), irregular troilite grains inside metallic Fe-Ni (cf. Rubin, 1994)...veinlets (cf. Rubin, 1992), and polycrystalline troilite (cf. Bennett and McSween, 1996). All except Shuangyang |  | 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...(typically less than 20 lm) occur within Fe,Ni metal/troilite aggregates, both as rounded inclusions within...inclusions, 10–20 lm across, within Fe, Ni metal and troilite grains (Fig. 3a and b). Merrillite also occurs |  | | Journal (article/letter/editorial) | | 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 olivine—PO) 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 |  | | Journal (article/letter/editorial) | | chondrites. We studied bleached chondrules from Semarkona by ion microprobe for trace elements and H isotopes...and was partially replaced by phyllosilicates, troilite was altered to pentlandite, but pyroxene was completely...chondrites, especially in the wellstudied falls Semarkona, Bishunpur, Chainpur, and Tieschitz, most of the...fluids and replaced in some cases by metal and troilite. Finally, Skinner et a/. (1989) observed the same...the highly unequilibrated ordinary chondrites, Semarkona (LL3.0) and Bishunpur (L3. I), led to our "rediscovery" |  | Brearley, Adrian J, Scott, Edward R.D, Keil, Klaus, Clayton, Robert N, Mayeda, Toshiko K, Boynton, William V, Hill, Dolores H (1989) Chemical, isotopic and mineralogical evidence for the origin of matrix in ordinary chondrites. Geochimica et Cosmochimica Acta, 53 (8) 2081-2093 doi:10.1016/0016-7037(89)90326-8 | Journal (article/letter/editorial) | | fine-grained matrix lumps and chondrule rims from Semarkona (GROSSMANet al., 1987). Transmission electron...extracting matrix materials intact from the host meteorite due to the small dimensions of matrix fragments...from this study (TAYLOR et al., 1984) and from Semarkona (GROSSMANet al., 1987), have been lacking. Consequently...subsequently isolated on two adjacent slices of the meteorite. Samples of the lump weighing 8 and 4 mg were...finely powdered in a precleaned agate mortar. (The meteorite was friable and easily powdered). A 7.5 mg split |  | | Journal (article/letter/editorial) | | light isotope enrichment for the LL3 chondrite Semarkona, to +2.7%0 per mass unit for the LL3 chondrite...was prevalent in CAI inclusions in the Allende meteorite. The oxygen anomaly led to the revision of theories...is evidence from these data that Bishunpur and Semarkona contain isotopically fractionated Cd. This is...to be enhanced in the heavier isotopes while Semarkona is depleted in these isotopes. Because the measurement...Isotopic ratios a of cadmium in whole rock meteorite samples Meteorite Type ALHA-77299,30 c,d H3 measured |  | | Journal (article/letter/editorial) | | edges. Assemblages in MAC 87320 are composed of troilite, phosphate, and Ni-rich metal. EET 92011 contains...contains assemblages composed of pentlandite, troilite, and Ni-rich metal. The assemblages in Renazzo contain...contain tochilinite, magnetite, troilite, pentlandite, and phosphate. In all of the assemblages in Renazzo...tochilinite is fine grained and intimately mixed with troilite, pentlandite, or magnetite. Opaque assemblages...rights reserved. 1. INTRODUCTION The Renazzo meteorite was first identified as distinct from other carbonaceous |  | | Journal (article/letter/editorial) | | / The halite-bearing Zag and Monahans (1998) meteorite breccias: Shock metamorphism, thermal metamorphism...significant fraction of their metallic Fe-Ni and troilite grains. The clastic matrices of these meteorites...grains of martensite with 8-11 wt% Ni also occur. Troilite in the clasts is essentially pure FeS with Ni...the detection limit of 0.04 wt%; however, some troilite grains have low but measurable concentrations...trails oftiny (0.2-2 ,urn) blebs of metal and troilite that cut through silicate grains and decorate |  | Sutton, S., Alexander, C.M.O'D., Bryant, A., Lanzirotti, A., Newville, M., Cloutis, E.A. (2017) The bulk valence state of Fe and the origin of water in chondrites. Geochimica et Cosmochimica Acta, 211. 115-132 doi:10.1016/j.gca.2017.05.021 | Journal (article/letter/editorial) | | Fe XANES to determine the Fe valences of bulk meteorite powders in Orgueil (CI1), a number of CMs and...experienced varying degrees of alteration, and Semarkona (LL3.00). The total ranges of bulk Fe valences...Orgueil 2.77, CMs 2.40-2.63, CRs 1.46-2.54, and Semarkona 2.10. Combining previous estimates of the present...fractional water losses to have been: Orgueil 15-26 %, Semarkona 73-83 %, CMs 23-48 %, and CRs 39-62 %. The associated...CMs -676 ‰ to -493 ‰, CRs -527 ‰ to -56 ‰, and Semarkona -527 ‰ to 154 ‰. The CI, CM, CR and ordinary chondrites |  | | Journal (article/letter/editorial) | | determined by EPMA analysis. Compositional fields of Semarkona, Tagish Lake carbonate-poor, and Bells are also...versus c) SiO2 versus Na2O. diagrams of SK series Semarkona LL3 chondrite, lithology, and Bells CM obtained...micrometeorites do not show K-enrichment. In addition, the Semarkona LL3 chondrite, which consists largely of hydrous...Table 1). 2. Saponite-Rich Type The matrices of Semarkona ordinary chondrite, Bells CM chondrite, and Tagish...chondrites, Semarkona, Bells, and the Tagish Lake carbonate-poor lithology. The matrix of Semarkona contains |
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