NASA NTRS · 19790048521
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).
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Taylor, L. A., Coish, R. A., Onorato, P. I. K., Uhlmann, D. R.. 1978-01-01. Subophitic basalts from Mare Crisium - Cooling rates. https://ntrs.nasa.gov/citations/19790048521
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