Subophitic basalts from Mare Crisium: cooling rates.
Abstract
Subophitic basalt is the most common rock type at Mare Crisium. The cooling rate of a sample of this rock was determined by: (1) an olivine cooling speedometer and (2) Zr partitioning between ilmenite and ulvospinel. The kinetic modeling of the olivine cooling speedometer starts with a calculation of the compositional profile of olivine (the 'as-solidified profile') and proceeds to re-equilibration by diffusion as a function of cooling rate. The estimated cooling rate for subophitic basalts from the Luna 24 site is in the range of 2 C/day (about 0.1 C/hr), which is reasonably well corroborated by dynamic crystallization studies of Grove (1978).
- Publication:
-
Mare Crisium: The view from Luna 24
- Pub Date:
- 1978
- Bibcode:
- 1978mcvl.conf..473T
- Keywords:
-
- Basalt;
- Lunar Exploration;
- Olivine;
- Zirconium;
- Cooling;
- Geochemistry;
- Lunar Soil;
- Lunik Lunar Probes;
- Petrology;
- Rates (Per Time);
- Speed Indicators;
- 24077;
- CRISIUM;
- MARE;
- LUNA 24;
- MARE BASALTS;
- ROCKS;
- SAMPLES;
- LUNAR;
- OLIVINES;
- ILMENITE;
- ULVOSPINEL;
- COMPOSITION;
- ZIRCONIUM;
- SPEEDOMETERS;
- COOLING RATE;
- Lunar and Planetary Exploration; Moon;
- Moon:Basalts