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1994 Fiscal Year Final Research Report Summary

Formation and evolution processes of S-asteroids as inferred from primitive achondrites

Research Project

Project/Area Number 05833005
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 惑星科学
Research InstitutionThe University of Tokyo

Principal Investigator

TAKEDA Hiroshi  The University of Tokyo, Graduate school of sci., Prof., 大学院・理学系研究科, 教授 (50011523)

Project Period (FY) 1993 – 1994
KeywordsPrimitive achondrites / S-asteroids / material evolution / elemental distribution / partial melting / pyroxene / X-ray fluorescent analysis / chondrites
Research Abstract

In order to find relationship between the most common S-asteroids in the main asteroid beet and primitive chondritic source materials in the Solar System, mineralogical distributions of several new primitive achondrites have been investigated by electron and X-ray microanalysis techniques. The samples studied include five lodranites-acapulcoites with four coarse-grained recrystallized textures (Lodran, MAC88177, Y74357, Y791491, EET84302) and two with fine-grained ones (Acapulco, ALH81187) and two silicate inclusions in iron meteorites (Caddo County and Landes) . Electron probe microanalyzer and microfocus X-ray fluorescent analysis techniques have been applied to obtain two-dimensional elemental distribution maps of the above samples. The maps were then converted into mineral distribution maps. These meteorites consist of common component minerals in ordinary chondrites such as oliveine, orthopyroxene, augite, Plagioclase, FeNi metal, troilite etc. Their chemical compositions are nearly uniform within a grain and distribute within a small range between H and E chondrites. However, their modal abundances obtained from the mineral distribution maps differ geatly between the samples. Lodranites consist mainly of olivine and orthopyroxene and are depleted in plagioclase and some acaplucoites such as Acapulco and EET84302 and the Caddo County iron meteorite are enriched in plagioclase and FeNi metal and troilites. The processes of their formation and evolution can be explained by partial melting of low temperature melts and depletion of the melt from a high temperature region, and by migration of the melts and recrystallization around the depleted area. The heat source may be decay of ^<26>Al and collisions of planetesimals. Such process is what is expected during the growth of planetesimals by collisions and accreation to from fairly large S-asteroids.

  • Research Products

    (40 results)

All Other

All Publications (40 results)

  • [Publications] Yamaguchi A.: "Evolution of eucritic curst with relation to impact cratering events." Proceedings of ISAS Lunar Planetary Symposium. 108-111 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hiroi T.: "Modeling of S-type asteroid spectra using primitive achondrites and iron meteorites." Icarus. 102. 107-116 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Bogard D.: "Antarctic polymict eucrite Yamato 792769 and the cratering record on the HED parent body." Geochimica Cosmochimica. 57. 2111-2121 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takeda H.: "Mineralogical studies of lunar meteorite Yamato-793169, a mare basalt." Proceedings of NIPR Symposium on Antarctic Meteorites. 6. 3-13 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nakamura T.: "Mineralogy and petrology of the CK chondrites Yamato-82104,Yamato-693 and a Carlisle Lakes-type chondrite Yamato-82002." Proceedings of NIPR Symposium on Antarctic Meteorites. 6. 171-185 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kojima T.: "Unusual dark clasts in the Vigarano CV carbonaceous chondrite : Record of parent body process." Meteoritics. 28. 649-658 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 武田弘: "小惑星・隕石・物質科学-S型小惑星物質と原始的エコンドライトの関連性-" 日本惑星科学会誌. 2. 54-62 (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hiroi T.: "Grain size of the surface regolith of asteroid 4 Vesta estimated from its reflectance spectrum in comparison with HED metorites." Meteoritics. 29. 395-396 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takeda H.: "Mineralogy and 39AR-40AR age of an old pristine basalt : Thermal history of the HED parent body." Earth and Planetary Science Letters. 122. 183-194 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Miyamoto M.: "Evidence for excavation of deep crustal material of a Vesta-like body from Ca compositional gradients in pyroxene." Earth and Planetary Science Letters. 122. 343-349 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Suzuki M.: "Reaction products in the hydrothermal treatments on a single crystal of plagioclase." Mineralogical Journal. 17. 83-90 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takeda H.: "A mineralogical study of the proposed paired eucrites Y-792769 and Y793164 with reference to cratering events on their parent body." Proceedings of NIPR Symposium on Antarctic Meteorites. 7. 73-93 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Miyamoto M.: "Thermal history of lodranites Yamato 74357 and MAC88177 as inferred from the chemical zoning of pyroxene and olivine." Journal of Geophysical Research. 99. 5669-5677 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yamaguchi A.: "Textural variations and impact history of the Millbillillie eucrite." Meteoritics. 29. 237-245 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takeda H.: "Mineralogy of new Antarctic achondrites with affinity to Lodran and a model of their evolution in an asteroid." Meteoritics. 29. 830-842 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Yugami K.: "Mineralogy of acapulcoites and the formation and evolution of primitive achondrites." Proceedings of 27th ISAS Lunar & Planetary Symposium. 120-123 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Mikouchi T.: "Origin of Cr-rich core of olivine crystals in LEW87051 : Diffusive Modification of zoning prduced by a fractional crystallization." Proceedings 27th ISAS Lunar & Planetary Symposium. 124-127 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Saito J.: "Detection of trace Ru, Rh, Pd in meteoritic FeNe metals by microbeam X-ray fluorescence spectrometer." Photon Factory Activity Report. 11. 44 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Mikouchi T.: "Exsolution lamellae of kirschsteinite in Mg-Fe olivine from an angrite meteorite." American Mineralogist. (in press). (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 武田弘: "固体惑星物質科学の基礎的手法と応用 第13章 第17章" 株式会社サイエンスハウス, 168-178,213-220 (1994)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hiroi T., Bell J.F., Takeda H.and Pieters C.M.: "Modeling of S-type asteroid spectra using primitive achondrites and iron meteorites." Icarus. 102. 107-116 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Bogard D., Nyquist L., Takeda H., Mori H., Aoyama T., Bansal B., Wiesmann H.and Shih C.-Y.: "Antarctic polymict eucrite Yamato 792769 and the cratering record on the HED parent body." Geochim Cosmochim. Acta. 57. 2111-2121 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takeda H., Arai T.and Saiki K.: "Mineralogical studies of lunar meteorite Yamato-793169, a mare basalt." Proc. NIPR Symp. Antarct. Meteorites. 6. 3-13 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nakamura T., Tomeoka K.and Takada H.: "Mineralogy and petrology of the CK chondrites Yamato-82104, Yamato-693 and a Carlisle Lakes-type chondrite Yamato-82002." Proc. NIPR Symp. Antarct. Meteorites. 6. 171-185 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kojima T., Tomeoka K.and Takeda H.: "Unusual dark clasts in the Vigarano CV3 carbonaceous chondrite : Record of parent body process." Meteoritics. 28. 649-658 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Hiroi T., Pieters C.M.and Takeda H.: "Grain size of the surface regolith of asteroid 4 Vesta estimated from its reflectance spectrum in comparison with HED meteories." Meteoritics. 29. 395-396 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takeda H., Mori H.and Bogard D.D.: "Mineralogy and ^<39>Ar-^<40>Ar age of an old pristine basalt : Thermal history of the HED parent body." Earth Planet. Sci. Lett.122. 183-194 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Miyamoto M.and Takeda H.: "Evidence for excavation of deep crustal meterial of a Vesta-like body from Ca compositional gradients in pyroxene." Earth Planet. Sci. Lett.122. 343-349 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Suzuki M., Tagai T., Takeda H.and Tsukimura K.: "Reaction products in the hydrothermal treatments on a single crystal of plagioclase." Mineral. Journ.17. 83-90 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takeda H., Yamaguchi A., Nyquist L.E.and Bogard D.D.: "A mineralogical study of the proposed paired eucrites Y-792769 and Y-793164 with reference to cratering events on their parent body." Proc. NIPR Symp. Antarct. Meteorites. 7. 73-93 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Miyamoto M.and Takeda H.: "Thermal history of lodranites Yamato 74357 and MAC88177 as inferred from the chemical zoning of pyroxene and olivine." Journ. Geophys. Res.99. 5669-5677 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yamaguchi A., Takeda H., Bogard D.D.and Garrison D.: "Textural variations and impact history of the Millbillillie eucrite." Meteoritics. 29. 237-245 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takeda H., Mori H., Hiroi T.and Saito J.: "Mineralogy of new Antarctic achondrites with affinity to Lodran and a model of their evolution in an asteroid." Meteoritics. 29. 830-842 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Mikouchi T., Takeda H., Miyamoto M., Ohsumi K.and Mckay G.A.: "Exsolution lamellae of kirschsteinite in Mg-Fe olivine from an angrite meteorite." American Mineralogist. (in press). (1995)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yamaguchi A.and Takeda H.: "Evolution of eucritic curst with relation to impact cratering events." Proc. of ISAS Lunar Planet. Symp.108-111 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Yugami K., Takeda H.and Miyamoto M.: "Mineralogy of acapulcoites and the formation and evolution of primitive achondrites." Proc. of 27th ISAS Lunar & planet. Symp.120-123 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Mikouchi T., Miyamoto M., G.A.Mckay and Takeda H.: "Origin of Cr-rich core of olivine crystals in LEW87051 : Diffusive Modification of zoning produced by a fractional crystallization." Proc. of 27th ISAS Lunar & planet. Symp.124-127 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Saito J., Ebihara M., Ozaki H., Saiki K., Hoshi T., Yugami K.and Takeda H.: "Detection of trace Ru, Rh, Pd in meteoritic FeNe metals by microbeam X-ray fluorescence spcectrometer." Photon Factory Activity Report. 11. 44 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takeda H.: "Asteroids, meteorites, material Sciences Genetic relation between S-type asteroids and primitive achondrites." J.Jap. Soc. Planet. Sci.2. 54-62 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Takeda H., Kitamura M.and Miyamoto M.(ed.): "Basic methods and application of material sciences of planetary matter. Chap. 13 and 17." Science House. 168-178,213-220 (1994)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1996-04-15  

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