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

摘要

Abstract Study of four Chelyabinsk LL5 ordinary chondrite fragments with different lithology was carried out using X-ray diffraction and M?ssbauer 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 M?ssbauer spectroscopy were compared. Distribution coefficients K D and the temperatures of cations equilibrium distribution T eq in the olivine and orthopyroxene were evaluated.]]>