| タイトル | The formation of lunar breccias - Sintering and crystallization kinetics |
| 著者（英） | Uhlmann, D. R.; Onorato, P. I. K.; Hopper, R. W.; Klein, L. |
| 著者所属（英） | Massachusetts Inst. of Tech. |
| 発行日 | 1975-01-01 |
| 言語 | eng |
| 内容記述 | The process of clastic breccia formation by viscous sintering in a stress-free environment is analyzed by treating crystallization and sintering as concurrent, competing processes. The kinetic analysis of crystallization is based on the construction of continuous cooling curves corresponding to the degree of crystallinity observed in the matrix of the breccia. These curves are obtained from corresponding time-temperature-transformation curves, which in turn are constructed from measured values of the crystal growth rate together with calculated values of the nucleation frequency. The kinetic analysis of sintering is based on a modification of the Frenkel (1945) treatment of viscous sintering appropriate for conditions of continuous cooling. The analysis is applied to Lunar Composition 70019 to illustrate the approach. It is shown that it is possible from the kinetic analysis to estimate both the rate at which a given breccia cooled and the minimum temperature at which the matrix particles came in contact. The results obtained for Lunar Composition 70019 seem physically reasonable and suggest that this sample cooled on the surface of the moon in its present form rather than buried in an ejecta blanket from which it was later excavated. |
| NASA分類 | LUNAR AND PLANETARY EXPLORATION |
| レポートNO | 78A46637 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/431618 |
