 | | 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...the high-pressure phases majorite and ringwoodite, the L6 chondrite Tenham is an instructive example...signature of the silicates occurring in the bulk of Tenham. Plagioclase is either pervaded by thin (200 nm)...high-pressure spinels, majorite and ringwoodite, were observed in a thin shock vein. Majorite is defect-free |  | | 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...that equilibrium crystallization of aluminous majorite occurred in the melt veins. This new mineral was...pyroxene had been limited only to the garnet phase majorite (Smith and Mason 1970). Recently, Sharp et al |  | | 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...akimotoite + majorite with minor metal-sulfide. The 520-lm-wide vein interior consists of majorite + magnesiowüstite...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 |  | 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);...assessments of the melt matrices concluded that majorite and akimotoite were the major phases. Our contrasting...inferred conditions during shock melt cooling of the Tenham and Suizhou meteorites, revealing in particular |  | | 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...ringwoodite, low-Ca majorite, clinoenstatite, hollandite-structured plagioclase and Ca-rich majorite. The Ca-rich...Ca-rich majorite occurs as a symplectitic intergrowth with a Ca-poor amorphous silicate phase in a 200 μm-diameter...a Ca-rich clinopyroxene precursor into Ca-rich majorite and (FeMg)SiO3 perovskite, which subsequently |  | 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) | | shock-produced (Mg, Fe)SiO3 glass in the Suizhou meteorite Ming CHEN,1* Xiande XIE,1 and Ahmed EL GORESY2...associated with majorite were identified in the shock veins of the Suizhou meteorite. The glass is surrounded...polycrystalline majorite and is identical in composition to the parental low-Ca pyroxene and majorite. These ovoid...surrounded by a fine-grained matrix composed of majorite-pyrope garnet, ringwoodite, magnesiowüstite, metal...the rim region pyroxene grains transformed to majorite due to a higher temperature. After pressure release |  | | 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...adjacent to the veins, and to majorite in the black vein itself. The majorite, which occurs in both equant...produced from the majorite upon the release of pressure. The olivines of the meteorite are also deformed |  | | Journal (article/letter/editorial) | | 859–869, 2013 The pressures and temperatures of meteorite impact: Evidence from micro-Raman mapping of mineral...wadsleyite, ringwoodite, high-Ca clinopyroxene, majorite-pyrope, jadeite, maskelynite, and lingunite. Olivine...silicate pocket, all enstatite transformed to a majorite-pyrope solid solution, whereas the high-Ca clinopyroxene...highly shocked chondrites include: ringwoodite; majorite; wadsleyite; magnesiowüstite; akimotoite; lingunite;...its discovery by Binns et al. (1969) in the Tenham meteorite (e.g., Gupta and Goyal 2011; Madon and Poirier |  | | Journal (article/letter/editorial) | | com/locate/epsl The breakdown of diopside to Ca-rich majorite and glass in a shocked H chondrite Naotaka Tomioka...January 2003 Abstract Fine-grained assemblages of majorite and glassy grains are for the first time identified...a shock-induced melt vein in an H chondritic meteorite. The bulk chemical composition of these aggregates...of diopside CaMgSi2 O6 in the host rock. Both majorite and glassy grains are Ca-rich and their formulae...Keywords: shock event; H chondrite; diopside; majorite; perovskite 1. Introduction Olivine, high-Ca |  | 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...high-pressure mineral assemblage: ringwoodite, majorite, and magnesiowüstite. This study provides evidence...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...022115. The textural characteristics of this meteorite and the identification of the various minerals |  | | 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 |  | 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...metallic Fe–Ni. The shock vein contains majorite (or majorite-pyropess) and magnesiowüstite (+ minor jadeite)...dynamic events were recorded in the shock vein. The majorite grain contained vitrified (Mg,Fe)SiO3-perovskite...and is a remnant of a first dynamic event. The majorite and magnesiowüstite were also crystallized directly...olivine (Fa16) nucleated on the magnesiowüstite and majorite. This feather-shaped olivine is evidence for rapidly |  | 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...veins and the vein margin region of the host meteorite were partially or totally transformed into high-pressure...high-pressure phases; ringwoodite, majorite, akimotoite, NaAlSi3O8 hollandite and jadeite. Matrix of the...the shock vein contains majorite–pyrope solid solution. The spatial distribution indicates that high-pressure...growth in olivine indicates that the shocked meteorite experienced the pressure for at least 4 s. Such |  | | 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...high-pressure phases such as ringwoodite, wadsleyite, majorite, among others (e.g., Binns et al. 1969; Smith...Rubin (1985) pointed out that ringwoodite and majorite were found in melt veins of seven L6 chondrites...H6 chondrite (Chen and Xie 1993). Ringwoodite, majorite, and lingunite (NaAlSi3O8-hollandite) were also |  | | Journal (article/letter/editorial) | | some cases. Thick melt veins in the Tenham L6 chondrite contain majorite and magnesiowüstite in the center...akimotoite, vitrified silicate-perovskite, and majorite in the edge of the vein, indicating crystallization...However, very thin melt veins (5–30 μm wide) in Tenham contain glass, olivine, clinopyroxene, and ringwoodite...~18 GPa. The silicate melt veins in Roy contain majorite plus ringwoodite, indicating pressure of ~20 GPa...(Chen et al. 1996), Acfer 040 (Sharp et al. 1997), Tenham (Tomioka and Fujino 1997; Xie et al. 2006), Umbarger |  | | 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) |  | 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...ordinary chondritic meteorite (L6). Coexistence of ringwoodite, majorite, and majorite-pyrope solid solution...static experiments that expect crystallization of majorite [(Mg,Fe)SiO3-garnet], instead of akimotoite, from...Akimotoite, pyroxene glass, high-pressure polymorphs, meteorite, shock, impact Introduction Orthopyroxenes [(Mg...transforms to high-pressure polymorphs including majorite [(Mg,Fe)SiO3-garnet], akimotoite [(Mg,Fe)SiO3-ilmenite] |  | | Journal (article/letter/editorial) | | 1165-1173, 1993 Modulated microstructurein synthetic majorite Y.rNnrN WlNc, Trson G.l,sramx, Ronnnr C. LrrsnRMeNN...Transmission electron microscopy on Mg end-member majorite crystals synthesizedat 22 GPa and above 2350 "C...modulation is due to a phase transfor'C, mation in majorite from cubic (spacegroup la3d) to tetragonal (14'/a)...intersecting wave systems of strain modulation. Majorite specimensfound in meteoritesreportedly have cubic...pressuresbetween 16 and 23 GPa and temperatures rich majorite with x > 0.2 found in meteoritesreportedly above |  | | Journal (article/letter/editorial) | | Guangzhou, P.R. China Abstract: The Suizhou meteorite, classified as an L6 chondrite, contains weakly...pyroxene, but almost all the plagioclase in the meteorite was melted and transformed into maskelynite during...very thin shock melt veins occur in the Suizhou meteorite, which contain abundant high-pressure phases,...coarse-grained ringwoodite, majorite, (Na,Ca)AlSi3O8-hollandite and fine-grained liquidus majorite-pyrope garnet.... The shock features of this meteorite match shock stages 3 to 5, while the presence of ringwoodite in |  | | Journal (article/letter/editorial) | | polymorphs in shock-induced melt veins in the meteorite and discusses their implication to the high pressure...The major high-pressure polymorphs are majorite and majorite-pyrope solid solution. Diopside, akimotoite...b) a very sluggish transformation rate. Majorite and majorite-pyrope occur as coarse-grained polycrystalline...transform into various high-pressure polymorphs (e.g., majorite, akimotoite, perovskite) which have been observed...transform to akimotoite (17.5-27.5 GPa and 6002050°C), majorite (16-22.5 GPa and 1600-2500°C), and perovskite |  | Rout, Surya S., Heck, Philipp R., Zaluzec, Nestor J., Ishii, Takayuki, Wen, Jianguo, Miller, Dean J., Schmitz, Birger (2017) Shocked chromites in fossil L chondrites: A Raman spectroscopy and transmission electron microscopy study. Meteoritics & Planetary Science, 52 (9) 1776-1796 doi:10.1111/maps.12887 | Journal (article/letter/editorial) | | from matrix and shock-melt veins in Catherwood, Tenham, and Coorara L chondrites were studied using Raman...intergrowths of chromite and xieite. Matrix chromite of Tenham has similar dislocation densities and planar fractures...fractures as a chromite from the fossil meteorite Golvsten 001 and higher dislocation densities than in...fossil meteorite Sextummen 003. Using this observation and knowing that the matrix of Tenham experienced...respectively, and we conclude that the studied fossil meteorite chromites are from matrix. (Fig. 1) in Middle |  | | 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...olivine-ringwoodite transformation. High pressure polymorphs Majorite - ilmenite - perovskite The high-pressure polymorphs |  | Ozawa, Shin, Ohtani, Eiji, Miyahara, Masaaki, Suzuki, Akio, Kimura, Makoto, Ito, Yoshinori (2009) Transformation textures, mechanisms of formation of high-pressure minerals in shock melt veins of L6 chondrites, and pressure-temperature conditions of the shock events. Meteoritics & Planetary Science, 44 (11) 1771-1786 doi:10.1111/j.1945-5100.2009.tb01206.x | Journal (article/letter/editorial) | | identified in Sahara 98222. Wadsleyite, ringwoodite, majorite, akimotoite, jadeite, and lingunite (NaAlSi3O8-hollandite)...original olivine. The nucleation and growth of majorite took place along the grain boundaries or fractures...ringwoodite, which has been described from this meteorite in a previous report (Grossman 1999). Jadeite...(Fig. 1). We identified ringwoodite, wadsleyite, majorite, akimotoite, jadeite, and lingunite (NaAlSi3O8-hollandite)...polycrystalline aggregates of majorite (Figs. 5 and 7d). Individual majorite crystals have a spindle-like |  | | Journal (article/letter/editorial) | | tite assemblage in shock veins of Sixiangkou meteorite MING CHEN,1* XIANDE XIE,1 DEQIANG WANG,1 and SICHAO...Science Ltd iangkou meteorite were collected. The major portion of Sixiangkou meteorite is now preserved...Observatory, Chinese Academy of Sciences, Nanjing. The meteorite containing abundant shock veins was classified...1994). The chondritic portion of the Sixiangkou meteorite consists of rockforming minerals, including olivine...including ringwoodite, majorite, hollandite-structured (Na,Ca,K)AlSi3O8, majorite-pyrope garnet, and magnesiowüstite |
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