 | | Journal (article/letter/editorial) | | http://meteoritics.org The fine-grained matrix of the Semarkona LL3.0 ordinary chondrite: An induced thermoluminescence...origin, and history of the fine-grained matrix in Semarkona and develop techniques suitable for small samples...chondrites, which is very high relative to bulk Semarkona. The other induced TL properties of these samples...cause of the luminescence in the Semarkona fine-grained matrix is forsterite. In some respects the matrix...data resemble that of Semarkona chondrules, in which the phosphor is forsterite and terrestrial forsterites |  | | Journal (article/letter/editorial) | | e-mail: ukelm@udec.cl CHEMIE der ERDE The Semarkona meteorite under a beam of electrons luminescences in...dominant red color is produced by the mineral forsterite and it is present as very fine grains in the...matrix that encircles everything in the meteorite. Forsterite is also sometimes present in large grains...9818, 10 Xiaoguan Dongli, Anding Menwai, Chaoyang District Beijing 00029, China e-Mail: zyli9818@126.com...Typesetting: Thomson Digital India Ltd., B-10-11-12, NSEZ, NOIDA, (UP) India Printing and binding: Printforce |  | | 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) | | 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 |  | DeHart, John M., Lofgren, Gary E., Jie, Lu, Benoit, Paul H., Sears, Derek W.G. (1992) Chemical and physical studies of chondrites: X. Cathodoluminescence and phase composition studies of metamorphism and nebular processes in chondrules of type 3 ordinary chondrites. Geochimica et Cosmochimica Acta, 56 (10) 3791-3807 doi:10.1016/0016-7037(92)90171-e | Journal (article/letter/editorial) | | been analyzed in the chondrules of four of them (Semarkona, type 3.0; Krymka, 3.1; Allan Hills A77214,3.5;...present in Semarkona ( l&20,60,5% by number, respectively), group A5 chondrules in Semarkona being more...function of petrologic type Section # Meteorite *o"rCe+ Semarkona Bishunpur Krymka Chainpur ALHA Hedjaz...on the four analyzed chondrites underlined): Semarkona, lOO%A5; Krymka, Bishunpur, SO%AS: Cbainpur, ALRA77214...of Natural History, Smithsonian Institution (Semarkona polished thick section made at UCLA). BH, Robert |  | | 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...chondrule and fine-grained material consisting of forsterite, kamacite, troilite, and possibly reduced C....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 |  | 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) | | 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) | | temperatures too low to permit diffusion into forsterite or enstatite. The reaction of SiP 2 with FeO...5 0.25 5.7 0.18 0.27 n.d. Fa = fayalite; Fs = forsterite; Wo = wollastonite;Tp = tephroite (Mn2SiO4);...and ALHA 77115) are paired with ALHA77011. This meteorite and Sharps have high contents of C-rich aggregates...of the least equilibrated chondrites such as Semarkona. We suggest that the key reaction responsible...(1), not by reactions involving enstatite or forsterite as the source of Si. Unfortunately, time constraints |  | | Journal (article/letter/editorial) | | chondrites, formed prior to final lithification of the meteorite and probably prior to parent body accretion. We...possible that matrix may differ in origin from meteorite to meteorite, thus reflecting the diversity of environments...(a) containing a large (-20 pm) enstatite, a forsterite (-7 pm) and clusters of platy fayalitic olivine...olivine. (e) Krymka matrix area with a cluster of forsterite and platy olivine. Some of the platy olivine...olivine occurs as overgrowths on the forsterite (arrow). (4Cluster of olivine grains in Krymka matrix with platy |  | Matsunami, Satoshi, Ninagawa, Kiyotaka, Nishimura, Satoru, Kubono, Noriko, Yamamoto, Isao, Kohata, Masaki, Wada, Tomonori, Yamashita, Yoshihiko, Lu, Jie, Sears, Derek W.G., Nishimura, Hiroshi (1993) Thermoluminescence and compositional zoning in the mesostasis of a Semarkona group A1 chondrule and new insights into the chondrule-forming process. Geochimica et Cosmochimica Acta, 57 (9) 2101-2110 doi:10.1016/0016-7037(93)90096-f | Journal (article/letter/editorial) | | and compositional zoning in the mesostasis of a Semarkona group Al chondrule and new insights into the chondrule-forming...group Al, porphyritic olivine chondrule in the Semarkona (LL3.0) chondrite with induced thermoluminescence...chondrules with anorthite-normative mesostases in Semarkona (LL3.0) and Bishunpur (LL3.1) is produced at wavelengths...on a large ( - 800 pm) group A 1 chondrule in Semarkona (LL3.0) which contains induced TL and compositional...should be addressed. A 50.47 mg chip of the Semarkona (LL3.0) chondrite (USNM 1805) was cut into three |  | | Journal (article/letter/editorial) | | Singhvi c a b c Space Science and Astrobiology Division, NASA Ames Research Center, MS245-3, Moffett Field...Physical Research Laboratory, Ahmedabad 380 009, India a r t i c l e i n f o Article history: Received...age Metamorphism a b s t r a c t Early work on meteorite thermoluminescence (TL), influenced by pottery...(2) the terrestrial age (time since fall) of a meteorite. For 14 years natural TL measurements were routinely...value of such data are presented, an Antarctic meteorite that underwent a major orbit change prior to fall |  | | Journal (article/letter/editorial) | | Secondary parent-body alteration transformed forsterite in the rims of CV and CK AOIs into more-ferroan...chondrites (e.g., Acfer 094 and Adelaide), and in the Semarkona LL3.0 ordinary chondrite (e.g., Grossman and Steele...(2004a), AOIs in reduced CV chondrites consist of forsterite, metallic Fe-Ni, and variable amounts (<1 to...Allende AOI rims presumably were originally all forsterite; diffusion of FeO during parent-body metamorphism/alteration...and is consistent with the O-isotopic evidence: forsterite, spinel, and diopside are 16O rich (D17O ffi 20 |  | | Journal (article/letter/editorial) | | the transmission electron microscope (TEM) to meteorite studies, mineralogical investigations of carbonaceous...sepentine composition (asterisk). Fa = fayalite. Fo = forsterite. Fs = ferrosilitc. En = enstatite. and 1-1 --...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...was an equi~ib~um process). Se~entinization of forsterite could have occurred at temperatures as low as |  | | Journal (article/letter/editorial) | | in the case of four chondrules removed from Semarkona (type 3.0) and Krymka (type 3.1) , by instrumental...the major chondrule groups Al, A2, and Bl in Semarkona, group A5 is a primary group whose presence provides...with a scheme that is independent of the host meteorite. The compositional classification scheme for chondrules...are present in the essentially unmetamorphosed Semarkona chondrite (Al, A2, A5, and Bl, which can be considered...consistent with the bulk composition of the host meteorite. Group A5 are unique in appearing in both equilibrated |  | | Journal (article/letter/editorial) | | isotopes in the mesostasis of a chondrule from the Semarkona LL3.0 ordinary chondrite Derek W.G. Sears a,*...9 April 2009 Abstract A large chondrule from Semarkona, the most primitive ordinary chondrite known,...also their co-variation (Clayton, 2008). When meteorite data are plotted as d17O against d18O, where d17;18...chondrule resilience to crushing. The Semarkona (LL3.0) meteorite is widely regarded as the least metamorphosed...(Sears et al., 1980). About 35% (by number) of Semarkona chondrules are ‘‘reduced” (i.e. low FeO silicates |  | | Journal (article/letter/editorial) | | carbonaceous chondrites (CCs), and in one ungrouped meteorite (Mueller 1968; Levi-Donati 1970; Rubin et al....matrices and chondrule rims of the two UOCs, Semarkona (LL3.00) and MET 00526 (L3.05) (Grossman and Brearley...thin sections of Semarkona and MET 00526 (two undesignated thin sections of Semarkona designated 101 and...orthoclase (K), albite (Al, Na), chromite (Cr, Fe), forsterite (Mg), spessartine (Mn), diopside (Si, Ca), and...fine-grained matrices and chondrule rims of two UOCs, Semarkona (LL3.00) and MET 00526 (L3.05) contain ubiquitous |  | 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...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...significant, and here we report such a find: the meteorite LAP 04840, a Rumuruti (R) group chondrite, with |  | 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...8.056, and all final results for cometary and meteorite samples and reference materials, including Fe-K |  | | Journal (article/letter/editorial) | | their own. However, if all chondrules from a meteorite group had similar initial 26 Al ⁄ 27Al ratios...the meteorite, the lower the 26Al ⁄ 27Al ratios tend to be (Huss et al. 2001). Even in Semarkona, there...isochrons. 2008, 2010). If Ca was mobilized in some Semarkona chondrule glasses, it seems likely that Mg was...isotopes. Three of the chondrules (CH4 and CH36 from Semarkona, and K27 from Krymka) whose phenocrysts and mesostases...magnetites that formed from the altering fluid in Semarkona (5&—Choi et al. 1998). For chondrule CH36 in |  | | Journal (article/letter/editorial) | | mineralogy of Type II, FeO-rich chondrules in Semarkona (LL3.0): Origin by closed-system fractional crystallization...of type II porphyritic olivine chondrules in Semarkona (LL3.0) has been studied in detail. Olivines in...similar to olivines in type IA chondrules in Semarkona and may result from d&aggregation of such chondrules...The type IA porphyritic olivine chondrules in Semarkona were described by JONESand Scorr ( 1989), who...olivine chondrules in the same chondrite. In Semarkona, type II chondrules represent approximately 23 |  | | Journal (article/letter/editorial) | | oxygen fugacity, and water/rock ratio, on the meteorite parent bodies. Experimental research can provide...hydrous phases in the carbonaceous chondrites. Meteorite Hydrous phase Composition References CI Serpentine...experiments show that the alteration product of forsterite is consistently serpentine for a wide pH range...dissolution behavior between forsterite and enstatite. In contrast to enstatite, forsterite (Mg2SiO4) dissolves...be a more favorable product of alteration of forsterite than saponite (Mg/Si = 0.75). It is significant |  | | Journal (article/letter/editorial) | | and Industrial Research), Dona Paula, Goa 403004, India School of Earth, Atmospheric and Environmental...16O-poor material that is not recognized in the meteorite record. A majority of the spherules have ∆17O...fairly robust indicator to understand precursor meteorite body, and different level of heating in different...several relict olivines (Appendix A) with similar forsterite contents (~99%) which contain small Fe−Ni inclusions...AAS62-51-P24 (Appendix A) has a single large forsterite grain (Fo ~95%) with homogeneous chemical composition |  | | Journal (article/letter/editorial) | | 3Physical Research Laboratory, Ahmedabad 380 009, India of Natural History, Chicago, IL 60605, and Department...isotopic compositions reflect the iron-group of the meteorite (H, L, or LL). Isotopic uniformity of H3 to H6...identification of genetic association with other meteorite types (achondrites and iron) and for recognition...combination of these processes has left each planet and meteorite parent body with a distinctive oxygen isotopic...fractionation line is defined as: 6”O = 0.526”0. For a meteorite sample, an excess in “0 can be defined as A”0 |  | | Journal (article/letter/editorial) | | identified. The incompatible-rich olivines, which have forsterite contents that are greater than Fo98, appear to...the major silicate phases of chondrules from Semarkona (LL3.0), Bishunpur (L3. l), and Chainpur (L/LL3...probe analysis from polished thin sections of Semarkona (LL3.0), Bishunpur (L3. I), and Chainpur (L/LL3...the chondrules and much of the Fe in the bulk meteorite is in metal and sulfide. As can be seen, the fit...make up such a large fraction of the meteorite, in the bulk meteorite. Table 1. The mean compositions of |
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