9:45 AM - 10:00 AM
[PPS21-04] Chemical evolution of lunar magma ocean: evaluation of density overturn
Keywords:The Moon, magma ocean, density overturnHess and Parmentier (1995) discussed gravita
The results show that the density contrast between LMO and the trapped melt becomes significantly large once plagioclase appears, on the other hand viscosity of the melt is. The percolation time varies by up to about two orders of magnitude for the variation of porosity by two times, whereas it varies by up to about 5 orders of magnitude for the variation of grain size by one orders of magnitude, and the effect of X is not essentially. Comparing the percolation time at the critical crystal fraction for each step of differentiation calculation and the duration of the whole LMO crystallization, we can conclude that the percolation time is much shorter than the crystallization time if the grain size is larger than 1.0 cm. If we assume that the grain size of crystallizing grains in LMO is 0.1 to 1 cm in order, which is the average size in terrestrial magmas, melt overturn between LMO and trapped melt takes place easily during crystallization of LMO, which would make formation of extremely dense layer below the anorthosite crust at the final stage of LMO crystallization difficult.