Mineral Chemistry of MUSES-C Regio Inferred from Analysis of Dust Particles Collected from the First- and Second-Touchdown Sites on Asteroid Itokawa.

The mineralogy and mineral chemistry of Itokawa dust particles captured during the first and second touchdownson the MUSES-C Regio were characterized by synchrotron- radiation X-ray diffraction and field-emission electron microprobeanalysis. Olivine and low- and high-Ca pyroxene, plagioclase, and merrillite compositions of the first- touchdownparticles are similar to those of the second- touchdownparticles. The two touchdownsites are separated by approximately 100 meters and therefore the similarity suggests that MUSES-C Regio is covered with dust particles of uniform mineral chemistry of LL chondrites. Quantitative compositional properties of 48 dust particles, including both first- and second- touchdownsamples, indicate that dust particles of MUSES-C Regio have experienced prolonged thermal metamorphism, but they are not fully equilibrated in terms of chemical composition. This suggests that MUSES-C particles were heated in a single asteroid at different temperatures. During slow cooling from a peak temperature of approximately 800 °C, chemical compositions of plagioclaseand K-feldspar seem to have been modified: Ab and Or contents changed during cooling, but An did not. This compositional modification is reproduced by a numerical simulation that modeled the cooling process of a 50 km sized Itokawa parent asteroid. After cooling, some particles have been heavily impacted and heated, which resulted in heterogeneous distributions of Na and K within plagioclasecrystals. Impact-induced chemical modification of plagioclasewas verified by a comparison to a shock vein in the Kilabo LL6 ordinary chondritewhere Na- K distributionsof plagioclasehave been disturbed.