1993 Fiscal Year Final Research Report Summary
Experimental simulation of aqueous alteration in primitive meteorites and characterization by electron microscopy
| Project/Area Number |
04835005
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
惑星科学
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| Research Institution | Kobe University |
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Principal Investigator |
TOMEOKA Kazushige Kobe University, Faculty of Science, Professor, 理学部, 教授 (00201658)
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| Co-Investigator(Kenkyū-buntansha) |
TAKEDA Hiroshi University of Tokyo, Faculty of Science, Professor, 理学部, 教授 (50011523)
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| Project Period (FY) |
1992 – 1993
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| Keywords | Meteorite / chondrite / Aqueous alteration / Thermal metamorphism / Shock metamorphism / planetesimal / Serpentine / Electron Microscope |
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| Research Abstract |
Hydrothermal alteration experiments of olivine powder with several Fe/Mg rations were carried out under acidic and neutral conditions, and TEM observations were made on the run products. Well-developed tubular crystals of serpentine (chrysotile) were synthesized from Fo100 under both acidic and neutral conditons, and from Fo92 and Fo80 under acidic condition. Abundance and size of chrysotile apparently depend on the Fe contents of olivine, i.e. with increasing Fe contents, less and smaller chrysotile was formed. Acidity of the solution plays an important role for the formation of chrysotile. Platy and fibrous crystals of phyllosilicate, probably serpentine, were obtained from Fo50 and Fo20 treated under acidic condition, which are most similar to the phyllosilicates in the CI and CM chondrites. Framboidal aggregates of Fe-rich grains (Presumably Fe-hydroxide) were formed from Fa100 and Fo20, but not phyllosilicate was formed Fa100.
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