| Budget Amount *help |
¥1,900,000 (Direct Cost: ¥1,900,000)
Fiscal Year 1995: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1994: ¥1,400,000 (Direct Cost: ¥1,400,000)
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| Research Abstract |
It is very useful for classification of meteorites suffered from weak thermal metamorphism to assign quantitatively petrologic typed to the meteorites, based on the intensity of thermoluminescence (TL) of the meteorites. In 1994, the first year of this project, we made a new TL photon counting system. This has two advantages to conventional TL measurement systems (Sears et al., 1980), thoes detectable TL wavelengh is usually restricted to blue (<480nm) region. Detectable TL range of our TL photon counting system is easily extended to yellow to red region by exchanging filters and photomultipliers. Our system can cover low temperature region near liquid nitrogen temperatures (-200ﾟC), from which we can start heating of the sample to 450ﾟC and begin to count TL intensity of the sample. In the next year, 1995, we measured natural and induced TL glow curves of three samples of terrestrial feldspar samples (albite, orthoclase and anorthite), which are among important TL phospors in meteorites and examined details of experimental procedures using this TL photon counting system. We successfully measured low temperature TL emission of the albite sample. We also conducted several studies concerning TL and cathodoluminescence (CL) properties of meteorites (enstatite chondrites, aubrite, and eucrite), pairing of Antarctic meteorites, classification of chondrules using the CL colors and mesostasis composition, thermodynamic estimation of metamorphic conditions of equilibrated enstatite chondrites, and thermochemical calculations of the C-H-O system with solar ratio using energy minimization method.
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