 | | Journal (article/letter/editorial) | | ZOLENSKY Earth Science and Solar System Exploration Division, NASA, Johnson Space Center, Houston, Texas 77058...minerals into the lunar regolith. The Bench Crater meteorite also provides a glimpse of the petrography of...this time we had assumed that the Bench Crater meteorite is anhydrous, with only dehydrated phyllosilicates...al., 1974). I have examined the Bench Crater meteorite, a chondrite recovered from the lunar regolith...reported recently by Zolensky et al. (1 996a). This meteorite measures only 3 mm in greatest dimension and exists |  | | 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) | | 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...altered by reactions with hydrothermal fluids. Pyrrhotite in these clasts occurs as unusual needles wrapped...aggregates of phyllosilicate and garnet but not pyrrhotite. The isotopic compositions of S (d34SCDT) in |  | | 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...partially altered to phyllosilicates and Ni-rich pyrrhotite. In Bishunpur, alteration is confined to the...composition of the gas present during the alteration of Semarkona was not solar but was dominated by H20. The formation |  | | 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...Pentlandite; Pyrrhotite; Exsolution; High-temperature; Annealing; Aqueous alteration; Meteorite; Chondrite...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) | | indicates that saponite, Mg-Fe carbonate, and pyrrhotite are major phases and serpentine, magnetite, and...occupies core regions of fine-grained saponite, pyrrhotite has a low-Ni concentration, and Mg-Fe carbonate...sulfides: carbonates are dissolved into water and pyrrhotite is easily oxidized because it is a non-stoichiometric...Major phases are saponite, Mg-Fe carbonate, and pyrrhotite. Minor phases are serpentine and magnetite. SK05P2A2...SK05P2A2 in (c) and SK05P2H6 in (f) contain large pyrrhotite (Py) grains on their surfaces. SK05P2E6 in (d) |  | 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 |  | McCanta, M.C., Treiman, A.H., Dyar, M.D., Alexander, C.M.O’D., Rumble, D., Essene, E.J. (2008) The LaPaz Icefield 04840 meteorite: Mineralogy, metamorphism, and origin of an amphibole- and biotite-bearing R chondrite. Geochimica et Cosmochimica Acta, 72 (23) 5757-5780 doi:10.1016/j.gca.2008.07.034 | Journal (article/letter/editorial) | | elsevier.com/locate/gca The LaPaz Icefield 04840 meteorite: Mineralogy, metamorphism, and origin of an amphibole-...online 11 September 2008 Abstract The R chondrite meteorite LaPaz Icefield (LAP) 04840 is unique among metamorphosed...(En69Fs30Wo1), albite (An8Ab90Or2), magnetite, pyrrhotite, pentlandite, and apatite. Ferromagnesian minerals...ordinary chondrite phyllosilicates (as in the Semarkona chondrite), and insoluble organic matter (IOM)...mccanta@ gmail.com (M.C. McCanta). 1 Present address: Division of Geological and Planetary Sciences, California |  | | Journal (article/letter/editorial) | | apparently took place without change in bulk meteorite composition. from Ivuna were polished ultrathin...amounts of carbonate have been recently found in Semarkona (LL3) by Hutchison et al. (1987) and in Allegan...Because some phases present in Orgueil, especially pyrrhotite, interfere with FeO determination, a check was...considering the complexity of the phase system of this meteorite, the values given here agree well with the observed...Kerridge 36 TABLE I. Analysis of the Orgueil meteorite (wt.%). Bulk SiO, TiO, AI,03 Cr,03 Fe,03 FeO |  | | Journal (article/letter/editorial) | | carbides (Krot et al., 1997). Evidence from LL3.0 Semarkona that water moved through the matrix into chondrules...high-17O composition of magnetite grains in LL3.00 Semarkona, L3.05 EET 90161, LL3.6 Ngawi and other type-3...temperatures ranging from 200 - 260ºC 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 |  | | Journal (article/letter/editorial) | | 10 January 2020 Editor: R. Dasgupta Keywords: meteorite paleomagnetism Rumuruti chondrites dynamo magnetic...consists of pseudo-single domain pyrrhotite in LAP 03639 and pyrrhotite plus magnetite in PCA 91002. Paleomagnetic...Rumuruti chondrites are named after the Rumuruti meteorite that fell in Kenya in 1934, and have been recognized...form of iron sulfides (∼6 vol% on average, mainly pyrrhotite and pentlandite). Mineralogical features reflect...from the Sun. The accreting material, including pyrrhotite, was likely oxidized before accretion (Bischoff |  | | Journal (article/letter/editorial) | | armalcolite (165) 37 Asia (165) 129 1897 Assam India (167) 269 assimilation (170) 301 Atlantic Ocean...inclusions (164) 345, (165) 25, (169) 173 India (171) 7, (171) 607 India-Asia collision (171) 107 Indian Ocean...287 pyrolite (164) 277 pyroxene group (173) 235 pyrrhotite (164) 467 Q (173) 101 Qinghai-Xizang Plateau...(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 |  | | Journal (article/letter/editorial) | | parent body and the solar nebula from the Kaba meteorite Jérôme Gattacceca a,b,∗ , Benjamin P. Weiss b...online xxxx Editor: C. Sotin Keywords: Kaba meteorite meteorite paleomagnetism CV parent body asteroid differentiation...paleomagnetic results on Kaba CV chondrite. This meteorite contains 11 wt% pseudo-single domain magnetite...paleomagnetic evidence was obtained from a single meteorite. To further test this hypothesis, we present a...paleomagnetic study of another CV chondrite: the Kaba meteorite. * Corresponding author. E-mail address: gattacceca@cerege |  | Hicks, L. J., MacArthur, J. L., Bridges, J. C., Price, M. C., Wickham-Eade, J. E., Burchell, M. J., Hansford, G. M., Butterworth, A. L., Gurman, S. J., Baker, S. H. (2017) Magnetite in Comet Wild 2: Evidence for parent body aqueous alteration. Meteoritics & Planetary Science, 52 (10) 2075-2096 doi:10.1111/maps.12909 | Journal (article/letter/editorial) | | this hypothesis, powdered material from a CR2 meteorite (NWA 10256) was shot into the aerogel at 6.1 km...silicates, requiring aqueous activity in the meteorite parent body. Hematite and maghemite c-Fe2O3 are...look at powdered material from a CR2 chondrite meteorite, selected as an analogue to Wild 2, including...magnetite grain from a thin section of the same CR2 meteorite shows a Fe-rich content with a trace of Cr. Peaks...Hematite Goethite Chromite Chromite Peridotite Pyrrhotite Troilite Illite Nontronite Nontronite Nontronite |  | Muxworthy, Adrian R., Bland, Phillip A., Davison, Thomas M., Moore, James, Collins, Gareth S., Ciesla, Fred J. (2017) Evidence for an impact-induced magnetic fabric in Allende, and exogenous alternatives to the core dynamo theory for Allende magnetization. Meteoritics & Planetary Science, 52 (10) 2132-2146 doi:10.1111/maps.12918 | Journal (article/letter/editorial) | | study of the matrix of Allende CV3 chondritic meteorite, isolating the matrix’s primary remanent magnetization...The primary magnetic mineral was found to be pyrrhotite. Given the thermal history of Allende, we conclude...that give chondrites their name. The Allende meteorite is a member of the CV group of carbonaceous chondrites...early solar system processes, contained in this meteorite and others, remain poorly understood and a matter...in interpreting the paleomagnetic record in a meteorite. Shock metamorphism has not been considered a |  | | Journal (article/letter/editorial) | | e.g. Murchison (CM2), Bishunpur (LL3.1) and Semarkona (LL3.0) [6,7,10,20,24,25], and have also been...estimates are based on Alexander et al. [51] for Semarkona, Rambaldi and Wasson [20] for Bishunpur, Huss...100 Ma [50] Meteorite name Type Metamorphic Geothermometer temperature (°C) Semarkona LL3.0 250 ð2Þ...olivine. The least metamorphosed type LL3.0 Semarkona meteorite indicates the maximum metamorphic temperature...nebula. 5. Discussion Magnetic signatures in bulk meteorite samples result from magnetic minerals in different |  | Joswiak, D. J., Brownlee, D. E., Matrajt, G., Westphal, A. J., Snead, C. J. (2010) Kosmochloric Ca-rich pyroxenes and FeO-rich olivines (Kool grains) and associated phases in Stardust tracks and chondritic porous interplanetary dust particles: Possible precursors to FeO-rich type II chondrules in ordinary chondrites. Meteoritics & Planetary Science, 44 (10) 1561-1588 doi:10.1111/j.1945-5100.2009.tb01192.x | Journal (article/letter/editorial) | | = Cr-rich spinel, gl = silicate glass, pyrr = pyrrhotite, pent = pentlandite, En = enstatite trid = tridymite...compositions were observed attached to a >2 µm pyrrhotite grain (Figs. 3b and 3c), indicating that this...3b which separated during capture. A ~300 nm pyrrhotite crystal that is present along the edge of the...TP in Track 57 (Febo) is composed of a large pyrrhotite grain with apparent size of 2 µm and an equal...size were observed sandwiched between the large pyrrhotite grain and the fine-grained silicates. The TP |  | JOSWIAK, David J., BROWNLEE, Donald E., MATRAJT, Graciela, WESTPHAL, Andrew J., SNEAD, Christopher J., GAINSFORTH, Zack (2012) Comprehensive examination of large mineral and rock fragments in Stardust tracks: Mineralogy, analogous extraterrestrial materials, and source regions. Meteoritics & Planetary Science, 47 (4) 471-524 doi:10.1111/j.1945-5100.2012.01337.x | Journal (article/letter/editorial) | | Ko = kosmochloric, Pent = pentlandite, Pyrr = pyrrhotite, Sph = sphalerite, Roed = roedderite, SiC = silicon...1(TP) Major Pyrr+Sph Pyrr+Pent+Sph Kam Fo98–99.4 Pyrrhotite Plag(An64, An75)? Kool grain Fo83+Spnl En99.8...Estimated MSG in track Abundant Kool grain Fe-oxide Pyrrhotite Absent Absent Chr, Cub Low Low or absent ...1(TP) = terminal particle(fragment 1), Pyrr = pyrrhotite, Sph = sphalerite, Pent = pentlandite, Fo = forsterite...discussion of MSG-like material produced from pyrrhotite), loosely bound fine-grained components present |  | | Book (edition) | | Italy NT Chieti NT Marsica AJjsaroka Fault Abee Meteorite aa Taylor County Texas Texas Southwestern U...River IN Index Indian states as applica¬ ble. BT India SA Bihar SA West Bengal Ajman Sheikdom. One of federation...Peninsula Ajmer City and district in central Raja¬ 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 |  | | Journal (article/letter/editorial) | | particles include iron-rich sulfides (especially pyrrhotite and to a lesser extent pentlandite), magnetite...growth of "accessory" phases like pentlandite, pyrrhotite, and magnetite. An "Fe-rich phyllosilicate" has...dominant "accessory" phases are pentlandite and pyrrhotite, together with very small «500 A) inclusions...sampled volumes during the chondritic particle and meteorite analyses were similar (i.e.• <1000 Adiameter)...ALEXANDER C. M. O. and BARBER D. J. (1987). The Semarkona meteorite: First recorded occurrence of smectite in |  | | Journal (article/letter/editorial) | | phases’’ or PCP), pentlandite and Ni-bearing pyrrhotite. We studied 11 CM chondrites that span the known...alteration. The extent of alteration varies from meteorite to meteorite. Some rocks (e.g., Murchison; QUE 97990;...Samples, petrographic types, and weathering grades Meteorite Section number Fall or find Petrographic type... Alteration of CM chondrites 91600, a CM-related meteorite that previous studies had suggested had been metamorphosed...rectangular blocks. Standards included the Allende meteorite, the USGS standards granite G-2 and basalt BHVO-1 |  | | 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) | | USA 3Earth Science and Solar System Exploration Division, NASA Johnson Space Center, Houston, TX 77058...phyllosilicates, implying that these mostly anhydrous meteorite classes may have experienced alteration events...alteration (McSween, 1979). Table 1 lists the meteorite names, abbreviations,thin section numbers, and...that all S was incorporated into pyrrhotite inclusions. Although pyrrhotite probably is the most common S-bearing...the mineralogic alteration index for a given meteorite. Table 3 gives the average serpentine formulae |  | | Journal (article/letter/editorial) | | occurrences of Ca-rich armalcolite and geikielite in a meteorite, and the second occurrence of phase T (an unidentified...2007). To gain a deeper insight into this unique meteorite and a better understanding of the variety of materials...described by Jiang et al. (2004). Samples of Allende meteorite were treated and analyzed in the same way for...Ningqiang are mainly composed of awaruite, magnetite, pyrrhotite and pentlandite with minor amounts of whitlockite...2–53.8), enstatite, pigeonite, spinel, awaruite, pyrrhotite and pentlandite, which range in size from 20 |  | | Journal (article/letter/editorial) | | primitive ordinary chondrite known is Semarkona, although even this meteorite has experienced a small amount...95544. NWA 3127 was a previously unclassified meteorite, though it closely resembles NWA 1756 in thin...is considered to be paired with GRO 95502, a meteorite that had already been chosen for this study. The...number of CL images were obtained of chondrules in Semarkona using a single-channel photon detector attached...(USGS), Reston, Virginia. Color CL images of Semarkona were also obtained using the ELN-3R luminoscope |
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