FILIFORM SCHREIBERSITE CRYSTALS IN METEORITES

UDC 523.681
https://doi.org/10.15407/mineraljournal.38.01.003
V.P. Semenenko, T.M. Gorovenko
M.P. Semenenko Institute of geochemistry, mineralogy and ore formation of the NAS of Ukraine
34, acad. Palladina pr., Kyiv-142, Ukraine, 03680
E-mail: cosmin@i.ua
FILIFORM SCHREIBERSITE CRYSTALS IN METEORITES
Language:
Ukrainian
Mineralogical Journal 2016, 38 (1): 3-11
Abstract: The results of electron-microscopic study of the morphology of schreibersite crystals — rhabdite, in deeply etched samples of the Omolon pallasite that has been performed for stony-iron meteorites for the first time are given. The rhabdite crystals are characterized by a similar distribution of identical in size and shape crystals in near surface and internal parts of a metal matrix of the pallasite; belonging to filiform crystals of needle-like, plate-like, lamellar, and rarely pillar-like shape; the presence of joints; regular orientation of individual crystals and their systems in 2—3 directions; the presence of some evidences of brittle deformations and slight shock heating. It was established that unlike rhabdite of iron meteorites one of pallasites is characterized by agreater morphological variety and limited spreading of deformation and heating structures, caused most likely by minor differences in cooling rate of their parent bodies and the shock-metamorphic history. The Omolon pallasite cooling rate in the temperature range of 600—500 °С was slightly higher than ones of the Sikhote-Alin and Mar’inka iron meteorites. The rhabdite filiform crystals of meteorites have many similar morphological characteristics with artificially grown filiform ones, although conditions, chemical composition and environment of their formation were different.
Keywords: meteorite, pallasite, morphology, schreibersite, rhabdite, filiform crystals.
References

  1. Artem'ev, S.R. and Belan, S.V. (2013), Vost.-Evrop. zhurn. peredovyh tehnologij, No 5/1, рр. 22-25.
  2. Berezhkova, G.V. (1969), Nitevidnye kristally, Nauka, Moscow, 158 р.
  3. Bondar', Ju.V. (1994), Termicheskaja istorija pallasitov po dannym mineralogo-geohimicheskih i trekovyh issledovanij, Avtoref. dis. kand. geol.-mineral. nauk, Kyiv, 22 р.
  4. Givargizov, E.I. (1977), Rost nitevidnyh i plastinchatyh kristallov iz para, Nauka, Moscow, 303 р.
  5. Grigor'ev, D.P. and Krecer, Ju.L. (1983), Doklady AN SSSR, Vol. 270 No 5, pp. 1192-1195.
  6. Larionov, M.Ju. (2012), Messbaujerovskaja spektroskopija s vysokim skorostnym razresheniem kristallov fosfidov (Fe, Ni)3P iz meteorita Sihotje-Alin', Avtoref. dis. kand. fiz.-mat. nauk, Ekaterinburg, 23 р.
  7. Maleev, M.N. (1971), Svojstva i genezis prirodnyh nitevidnyh kristallov i agregatov, Nauka, Moscow, 183 р.
  8. Pshenichnov, Ju.P. (1974), Vyjavlenie tonkoj struktury kristallov, Spravochnik, Metallurgija, Moscow, 528 р.
  9. Sangval, K. (1990), Travlenie kristallov. Teorija, jeksperiment, primenenie, Translated by Bystritskyi, A.V., Mir, Moscow, 492 р.
  10. Semenenko, V.P. and Gorovenko, T.M. (2009), Zap. Ukr. mіneral. tov., Vol. 6, рр. 63-69.
  11. Semenenko, V.P., Kozlov, I.S. and Tertychnaja, B.V. (1986), Meteoritika, Vol. 45, рр. 102-105.
  12. Semenenko, V.P., Samojlovich, L.G. and Kozlov, I.S. (1982), Meteoritika, Vol. 41, рр. 96-100.
  13. Semenenko, V.P., Samojlovich, L.G. and Tertychnaja, B.V. (1982), Mineral. Journ. (Ukraine), Kyiv, Vol. 4 No 3, рр. 51-56.
  14. Semenenko, V.P., Sobotovich, Je.V. and Tertychnaja, B.V. (1987), Meteority Ukrainy, Naukova dumka, Kyiv, 220 р.
  15. Semenenko, V.P., Sharkin, O.P. and Tertychnaja, B.V. (1984), Mineral. Journ. (Ukraine), Kyiv, Vol. 6 No 2, pp. 83-87.
  16. Syrkin, V.G. (1989), Materialy budushhego. O nitevidnyh kristallah metallov, Gosizdat, Moscow, 92 р.
  17. Buseck, P.R. (1977), Geochim. et cosmochim. acta, Vol. 41 No 6, pp. 711-740. https://doi.org/10.1016/0016-7037(77)90044-8 
  18. Clarke, R.S. and Goldstein, J.I.Jr. (1978), Schreibersite growth and its influence on the metallography of coarse-structured iron meteorites, Smithsonian Inst. Press, Washington, Vol. 21, 80 p.
  19. Semenenko, V.P., Bishoff, A., Weber, I. and Girich, A.L. (2001), Meteoritics and Planet. Sci., Vol. 36, pp. 1067-1085.
  20. Semenenko, V.P. and Girich, A.L. (1995), Miner. Mag., Vol. 59, pp. 443-454. https://doi.org/10.1180/minmag.1995.059.396.06 
  21. Semenenko, V.P., Girich, A.L., Shkurenko, K.O., Kychan, N.V., Shyrinbekova, S.N. and Gorovenko, T.M. (2011), Meteorites, Vol. 1 No 1, pp. 13-19, https://doi.org/10.5277/met110102.
  22. Semenenko, V.P. and Perron, C. (2005), Meteoritics and Planet. Sci., Vol. 40 No 2, pp. 173-185. https://doi.org/10.1111/j.1945-5100.2005.tb00373.x 
English