The Fe2+ occupancies in the silicates M1 and M2 sites in Chelyabinsk LL5 meteorite determined using XRD and Mössbauer spectroscopy

Abstract

Study of four Chelyabinsk LL5 ordinary chondrite fragments with different lithology was carried out using X-ray diffraction and Mossbauer spectroscopy with a high velocity resolution. The Fe2+ occupancies of the M1 and M2 sites in olivine, orthopyroxene, and clinopyroxene determined using X-ray diffraction and Mossbauer spectroscopy were compared. Distribution coefficients K D and the temperatures of cations equilibrium distribution T eq in the olivine and orthopyroxene were evaluated.