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|Title:||Characterization of Kemer L4 meteorite using Raman spectroscopy, X-ray diffraction, magnetization measurements and Mössbauer spectroscopy||Authors:||Maksimova, A. A.
Petrova, E. V.
Chukin, A. V.
Karabanalov, M. S.
Nogueira, Bernardo A.
Oshtrakh, M I
|Keywords:||Kemer L4 ordinary chondrite; X-ray diffraction; Raman spectroscopy; Magnetization measurement; Mössbauer spectroscopy||Issue Date:||5-Dec-2020||Publisher:||Elsevier||Project:||info:eu-repo/grantAgreement/FCT/UI0313/QUI/2020/PT||Serial title, monograph or event:||Spectrochimica acta. Part A, Molecular and Biomolecular Spectroscopy||Volume:||242||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 KD and the temperatures of equilibrium cation distribution Teq were also evaluated for olivine and orthopyroxene from two independent techniques and were in a good consistence: KD = 1.77, Teq = 441 K (X-ray diffraction) and KD = 1.77, Teq = 439 K (Mössbauer spectroscopy) for olivine and KD = 0.10, Teq = 806 K (X-ray diffraction) and KD = 0.09, Teq = 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.||URI:||http://hdl.handle.net/10316/91164||ISSN:||13861425||DOI:||10.1016/j.saa.2020.118723||Rights:||embargoedAccess|
|Appears in Collections:||I&D CQC - Artigos em Revistas Internacionais|
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