 | | Report (issue) | | Data: Orthorhombic. Point Group: 2/m 2/m 2/m. ringwoodite or wadsleyite crystals. Physical Properties:...3.405 (54), 1.453 (32) Chemistry: (1) Suizhou meteorite; calculated from structure; corresponds to (Mg...Series: Polymorph of forsterite, wadsleyite, and ringwoodite. Occurrence: In melt veins of shocked chondritic...metamorphism. Association: Ringwoodite, wadsleyite. Distribution From the Suizhou meteorite, fell at Xihe, Zengdu...(holotype), the Tenham meteorite, fell at Tenham Station, Windorah, Barcoo Shire, Queensland, Australia (cotype) |  | | Journal (article/letter/editorial) | | 0016-7037(95)00086-O Thermal and shock metamorphism of the Tenham chondrite: A TEM examination FALKO LANCENHORST...early episode of the solar system, the L6 chondrite Tenham has been affected by intense thermal metamorphism...high-pressure phases majorite and ringwoodite, the L6 chondrite Tenham is an instructive example for strong...signature of the silicates occurring in the bulk of Tenham. Plagioclase is either pervaded by thin (200 nm)...and ringwoodite, were observed in a thin shock vein. Majorite is defect-free, whereas ringwoodite contains |  | Ma, Chi, Tschauner, Oliver, Bindi, Luca, Beckett, John R., Xie, Xiande (2019) A vacancy‐rich, partially inverted spinelloid silicate, (Mg,Fe,Si)
2
(Si,□)O
4
, as a major matrix phase in shock melt veins of the Tenham and Suizhou L6 chondrites. Meteoritics & Planetary Science, 54 (9) 1907-1918 doi:10.1111/maps.13349 | Journal (article/letter/editorial) | | a major matrix phase in shock melt veins of the Tenham and Suizhou L6 chondrites Chi MA 1* , Oliver... was discovered within shock melt veins in the Tenham and Suizhou meteorites, two highly shocked L6 ordinary...ordinary chondrites. Relative to ringwoodite, this phase exhibits an inversion of Si coupled with intrinsic...remainder composed of a vitrified (Mg,Fe)SiO3 phase (in Tenham) or (Mg,Fe)SiO3-rich clinopyroxene (in Suizhou);...inferred conditions during shock melt cooling of the Tenham and Suizhou meteorites, revealing in particular |  | Ferroir, Tristan, Beck, Pierre, Van de Moortèle, Bertrand, Bohn, Marcel, Reynard, Bruno, Simionovici, Alexandre, El Goresy, Ahmed, Gillet, Philippe (2008) Akimotoite in the Tenham meteorite: Crystal chemistry and high-pressure transformation mechanisms. Earth and Planetary Science Letters, 275 (1) 26-31 doi:10.1016/j.epsl.2008.07.048 | Journal (article/letter/editorial) | | / l o c a t e / e p s l Akimotoite in the Tenham meteorite: Crystal chemistry and high-pressure transformation...20 September 2008 Editor: L. Stixrude Keywords: tenham chondrite shock melt vein akimotoite perovskite...documented in the shock-induced melt veins of the L6 Tenham chondrite. Four textural relationships between...al., 2004). The Tenham chondrite fell in 1879 in South Georgy, Queensland Australia. It is classified...chondrite of shock stage 4-5. Major phases in this meteorite are olivine, orthoenstatite, diopside, plagioclase |  | | Journal (article/letter/editorial) | | High-pressure phases in a shock-induced melt vein of the Tenham L6 chondrite: Constraints on shock pressure and...and mineralogy of a 580-lm-wide melt vein in the Tenham L6 chondrite were investigated using field-emission...edge consists of vitrified silicate perovskite + ringwoodite + akimotoite + majorite with minor metal-sulfide...at least 40 ms. Using a synthetic Hugoniot for Tenham and assuming that the sample experienced a peak-shock...GPa near the impact site, we estimate that the Tenham parent body experienced an impact with collision |  | | Journal (article/letter/editorial) | | new silicate mineral of the ilmenite group in the Tenham chondrite NAOTAKA TOMIOKA* AND KIYOSHI FUJINO...ilmenite group, was found in the shock-metamorphosed Tenham chondrite. It occurs as aggregates adjacent to...pressure and temperature generated by shock events in Tenham are estimated to be 22 GPa ,Pmax , 26 GPa and Tmax...a natural silicate perovskite phase in the Tenham meteorite was found. These high-pressure silicate minerals...sci.hokudai.ac.jp 0003–004X/99/0003–0267$05.00 Tenham chondrite, as compared to that in the Acfer 040 |  | | Journal (article/letter/editorial) | | transformation in a shock-induced melt vein of Tenham L6 chondrite Zhidong Xie ⁎, Thomas G. Sharp School...fragments entrained in a 580-μm-wide melt vein of the Tenham L6 chondrite were investigated using fieldemission...mechanisms. These high-pressure phases include ringwoodite, low-Ca majorite, clinoenstatite, hollandite-structured...in the Tenham are reconstructive. The transformation of olivine to polycrystalline ringwoodite appears...lamellae, but rather lamellae of polycrystalline ringwoodite, which is inconsistent with a coherent lamellar |  | Xie, Z., Sharp, T. G., Leinenweber, K., DeCarli, P. S., Dera, P. (2011) A new mineral with an olivine structure and pyroxene composition in the shock-induced melt veins of Tenham L6 chondrite. American Mineralogist, 96 (2) 430-436 doi:10.2138/am.2011.3437 | Journal (article/letter/editorial) | | composition in the shock-induced melt veins of Tenham L6 chondrite Zhidong Xie,1,* Thomas g. sharp,2...that occurs in shock-induced melt veins of the Tenham L6 chondrite. The new mineral, identified by transmission...the deep upper mantle. Keywords: Shock-induced, Tenham, olivine, melt vein inTroduCTion Impact metamorphism...those synthesized in high-pressure experiments. The Tenham L6 chondrite was strongly shocked to shock stage...Z. Xie et al. 2006a). The crystal sizes in the Tenham melt veins range from several micrometers down |  | | Report (issue) | | (Mg; Fe2+ )2 SiO4 Ringwoodite ° c 2001 Mineral Data Publishing, ver sion 1.2 Cubic. Point Group: 4=m...= 8.113{8.127 Z=8 X-ray Powder Pattern: Tenham meteorite. 2.447 (100), 1.434 (60), 2.028 (40), 2.872...42 0.05 22.98 0.30 37.86 0.05 [99.66] (1) Tenham meteorite; by electron microprobe, corresponding to...Fe2+ 0:52 )§=2:00 SiO4 : (2) Pampa del In¯erno meteorite; by electron microprobe, Al 2 O3 ; Cr2 O3 ; NiO;...silicate glass. Distribution: meteorites. In the Tenham, Pampa del In¯erno, Catherwood, and Coorara chondrite |  | | Journal (article/letter/editorial) | | shock-produced (Mg, Fe)SiO3 glass in the Suizhou meteorite Ming CHEN,1* Xiande XIE,1 and Ahmed EL GORESY2...identified in the shock veins of the Suizhou meteorite. The glass is surrounded by a thick rim of polycrystalline...fine-grained matrix composed of majorite-pyrope garnet, ringwoodite, magnesiowüstite, metal, and troilite. This study...exceeds 23 GPa. The post-shock temperature in the meteorite could have been above 477 °C. This study indicates...perovskite transformed from orthopyroxene in the Tenham meteorite. Sharp et al. (1997) found vitrified perovskite |  | | Journal (article/letter/editorial) | | wadsleyite (a modified spinel structure) or to ringwoodite (a spinel structure) (e.g., Boland and Liu, 1983;...shear − promoted mechanism for the olivine to ringwoodite transition. This is characterized by a diffusionless...composition has been found in a shocked chondritic meteorite (Tomioka and Fujino, 1997, 1999). This sowed intergrowths...energetically favorable, as proposed for the olivine − ringwoodite transition in Mg2SiO4 (Poirier, 1981). In this...CLINOENSTATITE-AKIMOTOITE INTERGROWTH IN A SHOCKED METEORITE The lamellar intergrowth of (Mg,Fe)SiO3 akimotoite |  | | Journal (article/letter/editorial) | | 859–869, 2013 The pressures and temperatures of meteorite impact: Evidence from micro-Raman mapping of mineral...mineral phases such as olivine, wadsleyite, ringwoodite, high-Ca clinopyroxene, majorite-pyrope, jadeite...the ringwoodite, which suggests chemical fractionation during a solid-state olivine-ringwoodite transformation...revealed a close correlation between the blue ringwoodite color and the peak observed at 877 cm–1; this...absorption bands of the ringwoodite. We propose that the blue color of the ringwoodite is due to a small amount |  | | Journal (article/letter/editorial) | | chondrite which fell in September 1969 in Victoria, Australia (Lovering et al., 1971). Vigarano is Type III...wollastonite, St. John's Island olivine and Eagle Station olivine were used as standards. Results were corrected...crystals. With this in mind, grains of ringwoodite in Tenham were re-analysed and Reed's calcium-free...analysed olivines is not a relict of an earlier ringwoodite structure. The olivines of the ureilites Goalpara...Goalpara: B.M.43058; PIn Dyalpur: B.M.5l185;P578 Tenham: B.M.1935,792; P433 REFERENCES Arrhenius, G. and |  | | Journal (article/letter/editorial) | | electron microscopy (ATEM) in two shocked chondrites, Tenham (L6) and Gaines County (H5). We have characterized...shock indices in the relevant minerals of the meteorite (Stoffler et al., 1991; Bischoff and Stoffler...chondrites have been studied: on the one hand, the Tenham meteorite, which is a highly shocked L6 chondrite and...H5 chondrite. Although it is more weathered than Tenham, Gaines County was chosen because it contains quite...reported by Wlotzka (1992) is FaI8.6' and the meteorite is classified in the H5-group. Our own analyses |  | | Journal (article/letter/editorial) | | and conditions of formation of akimotoite in the Tenham chondrite O. TSCHAUNER 1* , C. MA 2 , C. PRESCHER3...finding and the actual composition of akimotoite in Tenham, we show that this mineral has formed by solid–solid...akimotoite from a section of the holotype specimen, the Tenham L6 chondrite. The application of these crystal-chemical...METHODS The Tenham L6 chondrite is type material for akimotoite, bridgmanite, and ringwoodite (Binns et...effects in the minerals afar the melt veins of the Tenham chondrite indicate peak-shock pressures of at least |  | | Journal (article/letter/editorial) | | Electron Petrography of Shock-Produced Veins in the Tenham Chondrite G.D. Price, A. Putnis, and S. O. Agrell...in, and adjacent to the black veins of the Tenham meteorite reveals that the minerals have undergone varying...shock. The orthopyroxenes of the bulk of the meteorite have been transformed to clinopyroxenes in areas...the release of pressure. The olivines of the meteorite are also deformed, and some have been transformed...the fi-phase polymorph. Introduction The Tenham meteorite is a white olivine-hypersthene chondrite, |  | Ohtani, Eiji, Kimura, Yukiko, Kimura, Makoto, Takata, Toshiko, Kondo, Tadashi, Kubo, Tomoaki (2004) Formation of high-pressure minerals in shocked L6 chondrite Yamato 791384: constraints on shock conditions and parent body size. Earth and Planetary Science Letters, 227 (3) 505-515 doi:10.1016/j.epsl.2004.08.018 | Journal (article/letter/editorial) | | observed in Yamato 791384 L6 chondrite. Host meteorite mainly consists of olivine, pyroxenes and plagioclase...the host meteorite were partially or totally transformed into high-pressure phases; ringwoodite, majorite...temperatures around 2300 8C during the shock event. Ringwoodite lamellae were observed in the host olivine adjacent...investigation for ringwoodite lamellar growth in olivine indicates that the shocked meteorite experienced the...chondrite; high-pressure phase; phase transformation; ringwoodite lamellae; kinetics; parent body * Corresponding |  | | Journal (article/letter/editorial) | | minerals provide clues about the impact events of meteorite parent bodies, including their size and mutual...in Arizona, which was the product of an iron meteorite INTRODUCTION The Earth’s crust and upper mantle...OCCURRENCES OF HIGH-PRESSURE MINERALS IN METEORITES Ringwoodite, a high-pressure polymorph of olivine, is an...ion milling and ultramicrotomy. In the case of meteorite samples, the target particles for TEM observations...Mg2SiO4-rich spinel, ringwoodite, was discovered in the shock vein of the Tenham chondrite (L6; Binns |  | | Journal (article/letter/editorial) | | in the Tenham L6 chondrite contain majorite and magnesiowüstite in the center, and ringwoodite, akimotoite...veins (5–30 μm wide) in Tenham contain glass, olivine, clinopyroxene, and ringwoodite, suggesting crystallization...continuum level. Melt veins of Umbarger include ringwoodite, akimotoite, and clinopyroxene in the vein matrix...silicate melt veins in Roy contain majorite plus ringwoodite, indicating pressure of ~20 GPa. Melt veins of...(Chen et al. 1996), Acfer 040 (Sharp et al. 1997), Tenham (Tomioka and Fujino 1997; Xie et al. 2006), Umbarger |  | | Journal (article/letter/editorial) | | It is found that the melt veins in the Suizhou meteorite morphologically are the simplest, straightest...maskelynite, it is estimated that the Suizhou meteorite experienced shock pressures and shock temperatures...occurrences of high-pressure phases such as ringwoodite, wadsleyite, majorite, among others (e.g., Binns...Fujino 1997). Rubin (1985) pointed out that ringwoodite and majorite were found in melt veins of seven...2001, 2002; Ozawa et al. 2009). However, tiny ringwoodite grains were identified by Raman spectroscopy in |  | Guo, Zhuang, Li, Yang, Liu, Shen, Xu, Huifang, Xie, Zhidong, Li, Shijie, Li, Xiongyao, Lin, Yangting, Coulson, Ian M., Zhang, Mingming (2020) Discovery of nanophase iron particles and high pressure clinoenstatite in a heavily shocked ordinary chondrite: Implications for the decomposition of pyroxene. Geochimica et Cosmochimica Acta, 272. 276-286 doi:10.1016/j.gca.2019.10.036 | Journal (article/letter/editorial) | | glass selvage within the shock melt vein in this meteorite suggests that these phases formed as the result...surrounded high-pressure mineral assemblage: ringwoodite, majorite, and magnesiowüstite. This study...presence of shock-induced melt veins within the meteorite can provide invaluable insight to the nature and...incorporate Fe3+ (e.g. Silicate perovskite, ringwoodite), which had been used to explain the presence...shock metamorphism affecting the Tatahounine meteorite, but without the evidence of Fe gradients (Benzerara |  | | Journal (article/letter/editorial) | | other high-pressure minerals in the melt pocket: ringwoodite, akimotoite, augite, and hollanditestructured...1996). The most common of these minerals are ringwoodite ((Mg,Fe)2SiO4-spinel) (Mason et al. 1968), majorite...0003-004X/02/0809–1257$05.00 1958). Although ringwoodite, Mg-rich (MgFe)2SiO4-spinel, is believed to be...(Stöffler et al. 1991). However, our discovery of ringwoodite in melt pockets and the presence of maskelynite...and pockets, to identify large polycrystalline ringwoodite grains and to characterize alteration zones. |  | | Journal (article/letter/editorial) | | a shock-induced melt vein in an H chondritic meteorite. The bulk chemical composition of these aggregates...Ultrahigh-pressure polymorphs of olivine (wadsleyite, ringwoodite), lowCa pyroxene (majorite, akimotoite, and perovskite-phase)...with augite composition in a shocked Martian meteorite [12]. However, high-pressure phase transition... 2. ATEM observations We examined the Y75100 meteorite collected in Antarctica, which is an ordinary...fragments of highpressure minerals, such as ringwoodite, wadsleyite (Mg2 SiO4 polymorphs), akimotoite |  | Feng, Lu, Miyahara, Masaaki, Nagase, Toshiro, Ohtani, Eiji, Hu, Sen, El Goresy, Ahmed, Lin, Yangting (2017) Shock-inducedP-Tconditions and formation mechanism of akimotoite-pyroxene glass assemblages in the Grove Mountains (GRV) 052082 (L6) meteorite. American Mineralogist, 102 (6) 1254-1262 doi:10.2138/am-2017-5905 | Journal (article/letter/editorial) | | assemblages in the Grove Mountains (GRV) 052082 (L6) meteorite Lu Feng1,2, Masaaki Miyahara3,4, Toshiro Nagase5...low iron ordinary chondritic meteorite (L6). Coexistence of ringwoodite, majorite, and majorite-pyrope...Akimotoite, pyroxene glass, high-pressure polymorphs, meteorite, shock, impact Introduction Orthopyroxenes [(Mg...052082 (L6). Chemically fractionated olivine-ringwoodite and akimotoite-pyroxene glass assemblages (referred...highly equilibrated low iron ordinary chondritic meteorite (L6), with very homogeneous compositions of olivine |  | Guyot, F., Boyer, H., Madon, M., Velde, B., Poirier, J. P. (1986) Comparison of the raman microprobe spectra of (Mg, Fe)2SiO4 and Mg2GeO4 with olivine and spinel structures. Physics and Chemistry of Minerals, 13 (2) 91-95 doi:10.1007/bf00311898 | Journal (article/letter/editorial) | | structure at lower pressure and spinel structure (ringwoodite) at higher pressure (e.g. Bassett 1979). The...crystal of Olivine from a thin section of Tenham meteorite donated by the British Museum, Natural History...studied was ringwoodite (Mgo.v4Feo.26)2SiO4 from the same thin section of Tenham meteorite. Tenham is a shocked...locally transformed into the high-pressure phase ringwoodite (Binns 1970). Magnesium germanate was hydrothermally...for germanates, 3 sec for olivine and 10 s for ringwoodite. We restricted the investigation to the high |
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