Sintering, crystallization, and breccia formation

D. R. Uhlmann, L. Klein, R. W. Hopper

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


The process of breccia formation by viscous sintering in the absence of pressure, advanced forcefully by Simonds (1973), is examined in detail. The limitations on the standard model for such sintering are considered. The competing process of crystallization is analyzed kinetically in terms of time-temperature-transformation curves corresponding to various degrees of crystallinity. The analysis is applied to Lunar Composition 15418 to illustrate the approach. The results indicate that close constraints can be placed on the thermal histories of lunar breccias, particularly breccias with modest degrees of crystallinity, from microstructural observations and kinetic measurements.

Original languageEnglish (US)
Pages (from-to)277-284
Number of pages8
JournalThe Moon
Issue number1-3
StatePublished - Mar 1975

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science
  • Earth and Planetary Sciences (miscellaneous)


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