Characterization of Kemer L4 meteorite using Raman spectroscopy, X-ray diffraction, magnetization measurements and Mössbauer spectroscopy

A A Maksimova; E V Petrova; A V Chukin; M S Karabanalov; B A Nogueira; R Fausto; M Yesiltas; I Felner; M I Oshtrakh

doi:10.1016/j.saa.2020.118723

Characterization of Kemer L4 meteorite using Raman spectroscopy, X-ray diffraction, magnetization measurements and Mössbauer spectroscopy

Spectrochim Acta A Mol Biomol Spectrosc. 2020 Dec 5:242:118723. doi: 10.1016/j.saa.2020.118723. Epub 2020 Jul 20.

Authors

A A Maksimova¹, E V Petrova¹, A V Chukin¹, M S Karabanalov², B A Nogueira³, R Fausto³, M Yesiltas⁴, I Felner⁵, M I Oshtrakh⁶

Affiliations

¹ Institute of Physics and Technology, Ural Federal University, Ekaterinburg 620002, Russian Federation.
² Institute of Material Science and Metallurgy, Ural Federal University, Ekaterinburg 620002, Russian Federation.
³ CQC, Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal.
⁴ Faculty of Aeronautics and Space Sciences, Kirklareli University, Kirklareli, Turkey.
⁵ Racah Institute of Physics, The Hebrew University, Jerusalem, Israel.
⁶ Institute of Physics and Technology, Ural Federal University, Ekaterinburg 620002, Russian Federation. Electronic address: oshtrakh@gmail.com.

PMID: 32739517
DOI: 10.1016/j.saa.2020.118723

Abstract

The bulk interior of Kemer L4 ordinary chondrite was characterized for the first time by means of optical microscopy, scanning electron microscopy with energy dispersive spectroscopy, Raman spectroscopy, X-ray diffraction, magnetization measurements and Mössbauer spectroscopy with a high velocity resolution. The main and minor iron-bearing phases were found as well as ferrihydrite as a result of weathering. The Fe²⁺ partitioning among the M1 and M2 sites in olivine, orthopyroxene and clinopyroxene was determined from the X-ray diffraction. The ratios of Fe²⁺ occupancies for these crystals were estimated from both X-ray diffraction and Mössbauer spectroscopy data and appeared to be in a good agreement. The distribution coefficients K_D and the temperatures of equilibrium cation distribution T_eq were also evaluated for olivine and orthopyroxene from two independent techniques and were in a good consistence: K_D = 1.77, T_eq = 441 K (X-ray diffraction) and K_D = 1.77, T_eq = 439 K (Mössbauer spectroscopy) for olivine and K_D = 0.10, T_eq = 806 K (X-ray diffraction) and K_D = 0.09, T_eq = 787 K (Mössbauer spectroscopy) for orthopyroxene. The fusion crust of Kemer L4 was studied using X-ray diffraction, magnetization measurements and Mössbauer spectroscopy. Magnesioferrite and probably maghemite were found in the fusion crust in addition to other phases observed in the bulk interior.

Keywords: Kemer L4 ordinary chondrite; Magnetization measurements; Mössbauer spectroscopy; Raman spectroscopy; X-ray diffraction.