Examination of the liquid line of descent of mare basalts in light of data from melt inclusions in olivine.
Data on 226 melt inclusions and their host olivines (173 new analyses) are presented and interpreted in terms of general liquid lines of descent and olivine fractionation. The melt inclusions in olivine along with those in ilmenite and late-stage mesostasis in mare basalts define a complex trend. The trend is complicated by the effects of ilmenite, plagioclase, and pyroxene fractionation within the melt inclusions in olivine, the fact that most of the basalts were multiply saturated during olivine fractionation, and the phenomenon of late-stage silicate immiscibility. It is suggested that the first two factors can account for the observed marked divergence of the melt inclusion data from simple early olivine fractionation trends. The elimination of the effects of daughter mineral fractionation by homogenization experiments is considered.
Lunar and Planetary Science Conference Proceedings
- Pub Date:
- Lunar Evolution;
- Lunar Maria;
- Lunar Rocks;
- Chemical Fractionation;
- Liquid Levels;
- Melts (Crystal Growth);
- Lunar and Planetary Exploration