 | | Journal (article/letter/editorial) | | HAMMOND DOWNS, A NEW CHONDRITE FROM THE TENHAM AREA, QUEENSLAND, AUSTRALIA Brian Mason Smithsonian Institution...meteorites from the area of the Tenham shower (Queensland, Australia) was a 27 kg stone which proved...proved to be different from the other Tenham stones. It is a bronzite, H4, chondrite, the principal minerals...devitrlfied glass within the chondrules, and without visible plagioclase. This meteorite was found about...about 1950 near the Hammond Downs station, hence the name; its coordinates are lat 25° 28' S., long 142° |  | | 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...phases majorite and ringwoodite, the L6 chondrite Tenham is an instructive example for strong shock metamorphism...signature of the silicates occurring in the bulk of Tenham. Plagioclase is either pervaded by thin (200 nm)...it is transformed to maskelynite, a diaplectic glass of feldspar composition. In olivine, shock deformation |  | | 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 |  | 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...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...Meteoritical Society, 2019. 2 C. Ma et al. chondrites, Tenham and Suizhou. The main structural characteristic |  | 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...tablets of akimotoite are interwoven with a pyroxene glass with a lower Na and Fe content and a higher Mg content...compared to the adjacent akimotoite. This pyroxene glass is probably the product of (Mg,Fe)SiO3perovskite |  | 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 |  | | 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...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...Introduction Tenham fell in 1879 near Tenham Station (25°440 S, 142°570 E) in South Gregory, Queensland, Australia |  | | 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...suggest that most solid-state transformations in the Tenham are reconstructive. The transformation of olivine...ringwoodite lamellae; growth rate; Tenham 1. Introduction Tenham is a highly shocked L6 chondrite with...fragments in the same 580-μm-wide melt vein in Tenham. High-pressure minerals are common in and adjacent |  | | Report (issue) | | = 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;...jorite, magnesian silicate glass. Distribution: meteorites. In the Tenham, Pampa del In¯erno, Catherwood...the Australian National University, Canberra, Australia. Type Material: The Natural History Museum, London |  | | Journal (article/letter/editorial) | | org A shock-produced (Mg, Fe)SiO3 glass in the Suizhou meteorite Ming CHEN,1* Xiande XIE,1 and Ahmed...August 2004) Abstract–Ovoid grains consisting of glass of stoichiometric (Mg, Fe)SiO3 composition that...identified in the shock veins of the Suizhou meteorite. The glass is surrounded by a thick rim of polycrystalline...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) | | 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...blurring of chondrule outlines, the devitrification of glass in chondrules, the formation of feldspar and diopside...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 |  | | Journal (article/letter/editorial) | | interaction in quenched shock-induced melt of the Tenham L6-chondrite Hugues Leroux a; *, Jean-Claude Doukhan...microstructures in the shock-induced melt pockets of the Tenham (L6) chondrite have been investigated by analytical...metal/iron sulfide globules embedded in a silicate glass matrix, showing that the melt was quenched at high...the shock event. The composition of the silicate glass reflects non-equilibrium melting of several silicate...silicate liquids during the shock event. The silicate glass also contains tiny iron sulfide precipitates which |  | | 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, |  | | Journal (article/letter/editorial) | | 859–869, 2013 The pressures and temperatures of meteorite impact: Evidence from micro-Raman mapping of mineral...its discovery by Binns et al. (1969) in the Tenham meteorite (e.g., Gupta and Goyal 2011; Madon and Poirier...shearing during the shock event that extracted the meteorite from its parent body. The melt veins form a network...presents only mosaicism with diapletic plagioclase glass (maskelynite) interstitial to olivine and the different...of pyroxene, majorite. Plagioclase quenched to glass is conspicuous in the vicinity of the melt vein |  | | 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...mineral quite clearly. SAMPLES AND METHODS The Tenham L6 chondrite is type material for akimotoite, bridgmanite...effects in the minerals afar the melt veins of the Tenham chondrite indicate peak-shock pressures of at least |  | | Journal (article/letter/editorial) | | found within chromite grains from the matrix of Tenham L6 chondrite. Using this observation and taking...fossil achondrite the highest shocked fossil meteorite studied so far. This is makes Ost € 065 is a piece...Schmitz 2013) with the exception of one fossil meteorite € € 065), which was tentatively classified Osterplana...Society, 2018. 2 S. S. Rout et al. that the meteorite is different from any previously known meteorites...body of € 065 had experienced high shock and the meteorite Ost could be a fragment of the impactor that broke |  | | Journal (article/letter/editorial) | | The breakdown of diopside to Ca-rich majorite and glass in a shocked H chondrite Naotaka Tomioka a; , Makoto...a shock-induced melt vein in an H chondritic meteorite. The bulk chemical composition of these aggregates...at V18^24 GPa by a shock event. The CaSiO3 -rich glass is inferred to have crystallized in a perovskite...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 |  | Kayama, Masahiro, Sekine, Toshimori, Tomioka, Naotaka, Nishido, Hirotsugu, Kato, Yukako, Ninagawa, Kiyotaka, Kobayashi, Takamichi, Yamaguchi, Akira (2018) Cathodoluminescence of high-pressure feldspar minerals as a shock barometer. Meteoritics & Planetary Science, 53 (7) 1476-1488 doi:10.1111/maps.13092 | Journal (article/letter/editorial) | | on maskelynite and lingunite in L6 chondrites of Tenham and Yamato-790729. Under CL microscopy, bright...feldspars of lingunite and high-density plagioclase glass (maskelynite) formed due to a natural impact event...Maskelynite occurs widely in various types of shocked meteorite (e.g., lunar meteorites, shergottites, and ordinary...alkali feldspar and its shock-induced high-density glass has been proposed as a shock barometer with high...alkali feldspars and its shock-induced highdensity glass has been developed to estimate shock pressure 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) | | particles (np-Fe0) were identified in pyroxene glass, within the shock melt vein of Grove Mountains (GRV)...clinoenstatite (HP-CEn), silica glass, as well as vesicles, embedded in a pyroxene glass selvage within the shock...shock melt vein in this meteorite suggests that these phases formed as the result of decomposition of the...presence of shock-induced melt veins within the meteorite can provide invaluable insight to the nature and...shock metamorphism affecting the Tatahounine meteorite, but without the evidence of Fe gradients (Benzerara |  | | Journal (article/letter/editorial) | | pressure in some cases. Thick melt veins in the Tenham L6 chondrite contain majorite and magnesiowüstite... very thin melt veins (5–30 μm wide) in Tenham contain glass, olivine, clinopyroxene, and ringwoodite...(Chen et al. 1996), Acfer 040 (Sharp et al. 1997), Tenham (Tomioka and Fujino 1997; Xie et al. 2006), Umbarger...(Table 1), were obtained from the Center for Meteorite Studies at Arizona State University for investigation...Waconda, Pinto Mountains, Beaver, Umbarger, and Tenham. Doubly polished demountable thin sections were |  | | Journal (article/letter/editorial) | | zones in the melt pocket, surrounded by SiO2-rich glass and Fe-rich phyllosilicates. Fe2SiO4-spinel plus...presence of maskelynite and normal plagioclase glass indicate that the shock stage of Umbarger is S6...FeO-SiO2-rich zones, which consist of SiO2-rich glass and disordered Fe-rich phyllosilicates (Fig. 2)...stishovite structure. EDS data show that stishovite and glass are nearly pure SiO 2 , whereas the phyllosilicate...weathering. Fe2SiO4-rich spinel, stishovite, SiO2-rich glass, and Fe-rich phyllosilicate occur in an overall |  | 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) | | chondrite. Host meteorite mainly consists of olivine, pyroxenes and plagioclase glass. Mineral fragments...veins and the vein margin region of the host meteorite were partially or totally transformed into high-pressure...growth in olivine indicates that the shocked meteorite experienced the pressure for at least 4 s. Such...high-pressure phases and their textures in this meteorite, and estimated the pressure and temperature conditions... We identified mineral phases in the Y791384 meteorite by using the micro-Raman spectroscopy and documented |  | Miyahara, Masaaki, Ohtani, Eiji, Kimura, Makoto, Ozawa, Shin, Nagase, Toshiro, Nishijima, Masahiko, Hiraga, Kenji (2011) Evidence for multiple dynamic events and subsequent decompression stage recorded in a shock vein. Earth and Planetary Science Letters, 307 (3) 361-368 doi:10.1016/j.epsl.2011.05.010 | Journal (article/letter/editorial) | | Stixrude. Keywords: decompression melting shocked meteorite olivine dendrite TEM a b s t r a c t We investigated...high-pressure melting experiments of the Allende meteorite and peridotite indicate that the magnesiowüstite...-temperature melting experiments using the Allende meteorite and KLB-1 peridotite mimicking ordinary chondrites...events. It is likely that the parent-body of a meteorite has experienced collisions several times in the...chondritic host-rock. Silica-rich (N~70 wt.% as SiO2) glass-like materials are present around the rapidly grown |  | | 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...ion milling and ultramicrotomy. In the case of meteorite samples, the target particles for TEM observations...ringwoodite, was discovered in the shock vein of the Tenham chondrite (L6; Binns et al. 1969). Ringwoodite...spinel was discovered in the shock vein of a meteorite, the Umbarger chondrite (L6; Xie et al. 2002b) |  | | Journal (article/letter/editorial) | | source acting in the (100) planes (Chondrite L6 Tenham - TEM bright field, g = 002). 257 Fig. 6. Amorphous...deformation. Amorphization (forming so-called diaplectic glass) of silicates subjected to high shock pressure is...formation mechanism of diaplectic glass is still debated. Diaplectic glass could be a quenched high-pressure... case of diopside, the formation of diaplectic glass is clearly related to the nucleation and growth...thickening, the amorphous lamellae form the diaplectic glass. The dark bands are the residual crystal. The lamellae |
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