Determination of quadrupole splitting for 57Fe in M1 and M2 sites of both olivine and pyroxene in ordinary chondrites using M?ssbauer spectroscopy with high velocity resolution

摘要

Study of 11 ordinary chondrites using M?ssbauer spectroscopy with high velocity resolution revealed two crystallographically non-equivalent octahedral sites M1 and M2 in subspectra of olivine and pyroxene which were observed previously in pure natural or synthetic silicates only. M?ssbauer hyperfine parameters related to M1 and M2 sites in olivine and pyroxene determined from M?ssbauer spectra of ordinary chondrites were analyzed and compared with parameters of pure natural and synthetic silicates.