 | | 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...visible plagioclase. This meteorite was found about 1950 near the Hammond Downs station, hence the name; its...28' S., long 142° 48' E. INTRODUCTION During a meteorite expedition organized jointly by the Smithsonian |  | | Journal (article/letter/editorial) | | Fe)SiO3, a new silicate mineral of the ilmenite group in the Tenham chondrite NAOTAKA TOMIOKA* AND KIYOSHI...silicate mineral of the ilmenite group, was found in the shock-metamorphosed Tenham chondrite. It occurs...patterns correspond to the synthetic (Mg,Fe)SiO3 ilmenite phase with space group R3̄. Lattice parameters...pressure and temperature generated by shock events in Tenham are estimated to be 22 GPa ,Pmax , 26 GPa and Tmax...named after Syun-iti Akimoto. INTRODUCTION The ilmenite structure is one of the high-pressure polymorphs |  | 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...(MgSiO3 ilmenite type structure) is documented in the shock-induced melt veins of the L6 Tenham chondrite...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...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 |  | 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) | | 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 |  | | Journal (article/letter/editorial) | | possibly directly transform into akimotoite (MgSiO3 − ilmenite) at pressures above 20 GPa (Hogrefe et al., 1994)...composition has been found in a shocked chondritic meteorite (Tomioka and Fujino, 1997, 1999). This sowed intergrowths...experimental study on the mechanism of the pyroxene − ilmenite transition has been reported. Hattori et al. (2001)...(space group C2/c) transforms into a pseudo − ilmenite structure, FeGeO3 (II), which has been shown to...of C2/c clinoenstatite and akimotoite (MgSiO3 − ilmenite). The schematic drawings show the close − packed |  | | 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...exceeds 23 GPa. The post-shock temperature in the meteorite could have been above 477 °C. This study indicates...to highpressure polymorphs including majorite, ilmenite, and perovskite. High-pressure polymorphs are...perovskite transformed from orthopyroxene in the Tenham meteorite. Sharp et al. (1997) found vitrified perovskite |  | | 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...high-pressure polymorph of (Mg, Fe)SiO3 isotypic with ilmenite. The pure Mg endmember of akimotoite has a narrow...Recently, hemleyite, the endmember FeSiO3 in the ilmenite structure was reported based on a solid solution...akimotoite from a section of the holotype specimen, the Tenham L6 chondrite. The application of these crystal-chemical |  | | 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...shock metamorphism; ultrastructure 1. Introduction Tenham is a heavily shocked L6 chondrite * Corresponding...leroux@univ-lille1.fr (shock stage S6). The meteorite contains a dense network of shock-induced melt...example provided by shocked-melt pockets in the Tenham meteorite, for investigating the other limiting case |  | | Journal (article/letter/editorial) | | a shock-induced melt vein in an H chondritic meteorite. The bulk chemical composition of these aggregates...with augite composition in a shocked Martian meteorite [12]. However, high-pressure phase transition...-garnet (majorite)+ CaSiO3 -perovskite, MgSiO3 -ilmenite (akimotoite) 0012-821X / 03 / $ ^ see front matter... 2. ATEM observations We examined the Y75100 meteorite collected in Antarctica, which is an ordinary...majorite was ¢rst reported in the Shergotty Martian meteorite [12]. In that occurrence, it is also associated |  | | 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) | | and Price 1979), whereas akimotoite ((Mg,Fe)SiO3-ilmenite), magnesiowüstite ((Mg,Fe)O), (Mg,Fe)SiO3-perovskite...ACKNOWLEDGMENTS We thank Carlton Moore and the Center for Meteorite Studies at Arizona State University for supplying...Ringwoodite, natural (Mg, Fe)2SiO4 spinel in the Tenham meteorite. Nature, 221, 943–944. Chen, M., Sharp, T...NaAlSi3O8hollandite in the shocked Sixiangkou meteorite. Science, 287, 1633–1636. Irifune, T. (1993) Phase...Jr. (1968) Olivine-garnet transformation in a meteorite. Science, 160, 66–67. Oguri, K., Funamori, N. |  | | 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...ringwoodite and olivine were found so far in Taiban meteorite under optical microscope and SEM observations...photomicrograph of the black melt vein of the Taiban meteorite. Pockets inside the vein contain pyroxene (px) |  | | Journal (article/letter/editorial) | | source acting in the (100) planes (Chondrite L6 Tenham - TEM bright field, g = 002). 257 Fig. 6. Amorphous...characteristics of shock-induced microstructures in the two meteorite major phases, kamacite (bcc, Ni-poor) and taenite...dislocations tend to form cell structures (Iron meteorite Gibeon - TEM bright field). (b) Dislocations in...first discovered by Binns et al. (1969) in the Tenham chondrite. It occurs in meteorites as polycrystalline...transformation. High pressure polymorphs Majorite - ilmenite - perovskite The high-pressure polymorphs of |  | | 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...chondrites (Kimura et al. 2000, 2003). The Suizhou meteorite fell on April 15, 1986 at Dayanpo, Suizhou City...City, Hubei Province, China. This meteorite consists of the rock-forming minerals olivine, low-Ca pyroxene...whitlockite, chlorapatite, chromite, and ilmenite. The Suizhou meteorite was classified as an L6 chondrite (Wang |  | 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...95447, Germany 1 Abstract Akimotoite [(Mg,Fe)SiO3-ilmenite] was encountered in shock-induced melt veins of...highly equilibrated low iron ordinary chondritic meteorite (L6). Coexistence of ringwoodite, majorite, and...Akimotoite, pyroxene glass, high-pressure polymorphs, meteorite, shock, impact Introduction Orthopyroxenes [(Mg...[(Mg,Fe)SiO3-garnet], akimotoite [(Mg,Fe)SiO3-ilmenite], and bridgmanite [(Mg,Fe)SiO3-perovskite] (Tschauner |  | Beck, Pierre, Gillet, Philippe, Gautron, Laurent, Daniel, Isabelle, El Goresy, Ahmed (2004) A new natural high-pressure (Na,Ca)-hexaluminosilicate [(CaxNa1−x)Al3+xSi3−xO11] in shocked Martian meteorites. Earth and Planetary Science Letters, 219 (1) 1-12 doi:10.1016/s0012-821x(03)00695-2 | Journal (article/letter/editorial) | | Shergottites which de¢ne a subclass of the Martian meteorite family represent a suite of basaltic rocks very...observed in shocked meteorites, including Martian meteorite : b L-(Mg,Fe)2 SiO4 (wadsleyite) [2] b Q-(Mg,Fe)2...CAS+stishovite assemblage and hollandite in the NWA 856 meteorite Oxide Ms Hollanditea CAS+STIb CASc SiO2 TiO2...photograph of a melt pocket (MP) in the NWA 856 meteorite. The dashed line limits the zone in which partial...(Fig. 1 and Tables 1 and 2) occur throughout the meteorite. These zones have been interpreted as diaplectic |  | Miyajima, N., Goresy, A. E., Dupas-Bruzek, C., Seifert, F., Rubie, D. C., Chen, M., Xie, X. (2007) Ferric iron in Al-bearing akimotoite coexisting with iron-nickel metal in a shock-melt vein in an L-6 chondrite. American Mineralogist, 92 (10) 1545-1549 doi:10.2138/am.2007.2546 | Journal (article/letter/editorial) | | demonstrate that akimotoite in shock-melt veins of this meteorite has high proportions of Fe3+, with a Fe3+/ΣFe...typical Fe-bearing phases in shock veins in this meteorite, are enriched in Fe2+ rather than Fe3+, with Fe3+/ΣFe...VI(B)Si4+ in the ABO3 structural formula of MgSiO3-ilmenite under high pressures and temperatures, and operates...fugacity where Fe-Ni metal is stable. Keywords: Meteorite, L-6 chondrite, electron microscopy, Fe-bearing...et al. 1995; Chen et al. 1996). Akimotoite, the ilmenite-structured dense polymorph of (Mg,Fe)SiO3 pyroxene |  | 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...melting experiments of KLB-1 peridotite and Allende meteorite, which allowed us to estimate a meaningful shock |  | | Journal (article/letter/editorial) | | polymorphs in shock-induced melt veins in the meteorite and discusses their implication to the high pressure...MgSiO3-garnet (majorite) + CaSiO3-perovskite; MgSiO3-ilmenite (akimotoite) + CaSiO3-perovskite; MgSiO3-perovskite... and vitrified perovskite were observed in the Tenham L6 chondrite (Tomioka & Fujino, 1997, 1999; Xie...Sample and analytical methods The Sixiangkou meteorite fell on August 15, 1989, in Sixiangkou Town of...akimotoite is similar to akimotoite reported in Tenham (En78Fs21Wo1: Tomioka & Fujino, 1997) and Yamato |  | | Book | | Geochemistry/Mineralogy Xiande Xie Ming Chen Suizhou Meteorite: Mineralogy and Shock Metamorphism Springer...com/series/10171 Xiande Xie Ming Chen • Suizhou Meteorite: Mineralogy and Shock Metamorphism 123 Xiande...springer.com) Preface The Suizhou meteorite is a stone meteorite, which fell on April 15, 1986, in Dayanpo...province, China. Right after the fall of this meteorite, a group of scientists from the China University...collection of Suizhou meteorite samples. A total weight of 270 kg of this meteorite was collected. The largest |  | | Journal (article/letter/editorial) | | structure—a high-pressure silicate discovered in the Tenham chondrite (Ma et al. 2018a). Over the past six...BaTi2Fe4O11-type P2/c, close to scrutinyite-type R3c R3, ilmenite-type Pn3m, ice(VII)-type Pnma, CaFe2O4-type Pnma...al. (2016) Zagami shergottite Ma et al. (2018c) Tenham L6 chondrite Tschauner et al. (2014) Zagami, NWA...2018) and the type machiite in the Murchison CM meteorite (Makide et al. 2013). This implies that machiite...high-pressure clinopyroxene in the Tissint martian meteorite. Earth and Planetary Science Letters, 422, 194–205 |  | | Journal (article/letter/editorial) | | pressure in some cases. Thick melt veins in the Tenham L6 chondrite contain majorite and magnesiowüstite...However, 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 |
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