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| 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 |
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| Mg-rich olivine and the stability of niningerite in enstatite chondrites. ELLIOT C. SPIKER and PATRICK 6. HATCHER:...inside amoeboid olivine aggregates in the Allende meteorite. BERNARD SANJUAN and GIL MICHARD: Aluminum hydroxide...KULLERUD: Mercury ores from the New Idria Mining District: Geochemical and stable isotope studies. ERNST...C. M. 0. ALEXANDER and D. J. BARBER: The Semarkona meteorite: First recorded occurrence of smectite in...coarse-grained chondrule rims in the Allende meteorite: Origin, interrelationships and possible precursor |
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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... thus explaining the lack of basaltic (i.e., enstatite-plagioclase) meteorites and clasts from the aubrite...Muenow et al. (1992) measured volatile contents in enstatite chondrites (similar to the likely precursors of |
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| and coordination of titanium in ordinary and enstatite chondrites Steven B. Simon a,⇑, Stephen R. Sutton...pyroxene in suites of ordinary (H, L, and LL) and enstatite (EH and EL) chondrites of types 3 through 6 have...aqueous fluids from melting of accreted ice. In the enstatite chondrites, typically 20–90% of the Ti is trivalent...underwent reduction. Unlike ordinary chondrites, enstatite chondrites are thought to have been derived from...rights reserved. Keywords: Ordinary chondrites; Enstatite chondrites; Ti valence; Chondrite metamorphism |
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| 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...suggest that the cause of the luminescence in the Semarkona fine-grained matrix is forsterite. In some respects...respects the matrix TL data resemble that of Semarkona chondrules, in which the phosphor is forsterite |
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| 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...the population of chondrules in carbonaceous or enstatite chondrites. Chondrules define an isotopic mixing...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 |
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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 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 |
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| 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...The Kaidun breccia contains diverse clasts of enstatite (EH5 and EL3) and carbonaceous (CR2 and C l )...alteration minerals, and absence of olivine, enstatite, and glass indicate that the CMI clasts have suffered |
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| relationship such that c* of saponite parallels a* of enstatite. Matrix saponite exhibits a variety of textures...Kaba is determined by local bulk compositions; enstatite in chondrules has been altered more extensively... Are phyllosilicates the same throughout the meteorite? How does the alteration assemblage in Kaba compare...near Kaba, Hungary, in 1857, and the bulk of the meteorite is kept in the museum at the College of the Reformed...formation of Fe-bearing saponite from glass and enstatite in chondrules and from anhydrous silicates in |
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| 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 |
 | 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 |
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| 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 |
 | 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) |
| troilite phases in chondrules from the LL3 chondrite Semarkona J. N. GOSWAMI**,S. SAHIJPALI, K. KEHM2, C. M....IPhysical Research Laboratory, Ahmedabad 380 009, India 2McDonnell Center for Space Sciences, Washington...(FeS) phases in three chondrules from the Semarkona (LL3) meteorite were determined by an ion microprobe....for interpreting the I-Xe system within a given meteorite. Several plausible host phases have been proposed...study I-Xe systematics in samples of Allende meteorite and showed sodalite to be the major carrier of |
 | 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) |
| ordinary chondrites, three CM chondrites, three enstatite chondrites, a CI chondrite and a CR chondrite)...with metamorphic indicators in the ordinary and enstatite chondrites, suggest that the chondrites all accreted...closely resembles that now found in Renazzo and Semarkona. These two meteorites have almost M-shaped N isotope...ordinary chondrites (Semarkona, Bishunpur, Krymka, Inman and Tieschitz) and three enstatite chondrites (EET...Murchison, Murray and Orgueil), 1-2 g samples of each meteorite were given alternate treatments in 9 M HF/l M |
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| too low to permit diffusion into forsterite or enstatite. The reaction of SiP 2 with FeO produced by oxidation...and ALHA 77115) are paired with ALHA77011. This meteorite and Sharps have high contents of C-rich aggregates...of a zoned olivine grain (Fa24) and a euhedral enstatite grain. 409 Clast 2 in Krymka consists of individual...silica with oxidized Fe. The formation of Fs-rich enstatite (which is much less common) will be discussed...of the least equilibrated chondrites such as Semarkona. We suggest that the key reaction responsible |
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| 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...r a t i o n residues 1 - 2 g samples of each meteorite were given alternate t r e a t m e n t s i n 9 |
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| the transmission electron microscope (TEM) to meteorite studies, mineralogical investigations of carbonaceous...fayalite. Fo = forsterite. Fs = ferrosilitc. En = enstatite. and 1-1 -- lizardite. Mineralogy of the matrix... and Faso, while pyroxenes tend to be either enstatite or hedenbergite. In addition to these major phases...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 |
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| 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 |
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| apparently less common in H chondrites, and absent in enstatite chondrites. We used x-ray mapping and traditional...chondrites. We studied bleached chondrules from Semarkona by ion microprobe for trace elements and H isotopes...chondrites, especially in the wellstudied falls Semarkona, Bishunpur, Chainpur, and Tieschitz, most of the...the highly unequilibrated ordinary chondrites, Semarkona (LL3.0) and Bishunpur (L3. I), led to our "rediscovery"..."rediscovery" of bleached chondrules. For Semarkona section USNM 1805-7, a 4 x 5 grid of 20 maps, each containing |
 | 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 |
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| cosmic dust, micrometeorite, comet, asteroid, meteorite, chondrite, presolar A hypervelocity impact crater...blade-shaped grain at the top is a pyroxene (enstatite) whisker. Enstatite whiskers are commonly found in particles;...several times more carbon-rich than any known meteorite, and they are fragile porous aggregates of fi...(orange), organics, silicate minerals (including two enstatite whiskers) and amorphous silicates. The amorphous...variations of materials in the locales where specific meteorite parent bodies formed. As mentioned, all meteorites |
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| 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...minerals formed through reactions between vapor and enstatite during a heating event on the parent body (Housley...shown (box) in (a) containing a large (-20 pm) enstatite, a forsterite (-7 pm) and clusters of platy fayalitic...the American Museum of Natural History (AMNH) meteorite collection were studied using a petrographic microscope |
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| 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...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...anorthite, 21 wt% diopside, 11 wt% silica, and 10 wt% enstatite. No. of grains SiO2 TiO2 Al2O3 Cr2O3 FeO MnO |
 | Zhang, Ai-Cheng, Itoh, Shoichi, Sakamoto, Naoya, Wang, Ru-Cheng, Yurimoto, Hisayoshi (2014) Origins of Al-rich chondrules: Clues from a compound Al-rich chondrule in the Dar al Gani 978 carbonaceous chondrite. Geochimica et Cosmochimica Acta, 130. 78-92 doi:10.1016/j.gca.2013.12.026 | Journal (article/letter/editorial) |
| and the mantle are mainly composed of Al-rich enstatite and anorthite with minor amounts of mesostasis...the SARC consists mainly of Fe-rich olivine, enstatite, and Fe–Ni metal. Spinel and some olivine grains...D17O values down to 20& and 23&, respectively. Enstatite, sapphirine, and most olivine grains have similar...thermal metamorphism event, spinel, olivine, some enstatite, and the mesostasis experienced Mg–Fe exchange...aczhang@nju.edu.cn (A.-C. Zhang). 1 Present address: Division of Earth and Planetary Sciences, Kyoto University |
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| http://meteoritics.org Hydrothermal alteration experiments of enstatite: Implications for aqueous alteration of carbonaceous...revision accepted 04 November 2006) Abstract–Enstatite is one of the major constituent minerals in carbonaceous...Hydrothermal alteration experiments (26 in total) of enstatite were carried out at pH 0, 6, 7, 12, 13, and 14...saponite formed in various proportions by replacing enstatite. At 300 °C for 168 h, serpentine formed under...serpentine. The results indicate that alteration of enstatite is strongly dependent on the experimental conditions |
