TY - JOUR
T1 - Study of Bursa L6 ordinary chondrite by X-ray diffraction, magnetization measurements, and Mössbauer spectroscopy
AU - Maksimova, Alevtina A.
AU - Petrova, Evgeniya V.
AU - Chukin, Andrey V.
AU - Unsalan, Ozan
AU - Szabó, Ábel
AU - Dankházi, Zoltán
AU - Felner, Israel
AU - Zamyatin, Dmitry A.
AU - Kuzmann, Ernő
AU - Homonnay, Zoltán
AU - Oshtrakh, Michael I.
N1 - Publisher Copyright:
© 2021 The Meteoritical Society (MET)
PY - 2020/12
Y1 - 2020/12
N2 - We report the results of the complex study of the bulk interior of Bursa L6 ordinary chondrite using optical microscopy, scanning electron microscopy with energy dispersive spectroscopy, electron microprobe analysis (EMPA), X-ray diffraction (XRD), magnetization measurements, and Mössbauer spectroscopy. The main and minor iron-bearing phases and their chemical compositions were determined by these techniques. The detected iron-bearing phases in the bulk interior of Bursa L6 are the following: olivine; orthopyroxene; Ca-rich clinopyroxene; troilite; chromite; hercynite; ilmenite; the α2-Fe(Ni, Co), α-Fe(Ni, Co), and γ-Fe(Ni, Co) phases; and ferrihydrite resulting from meteorite terrestrial weathering. Using the EMPA, the values of fayalite and ferrosilite were obtained as ~25.2% and ~21.4%, respectively. The unit cell parameters for silicate crystals were determined from XRD, then the Fe2+ and Mg2+ occupations of the M1 and M2 sites in these crystals were estimated. Further calculations of the ratios of the Fe2+ occupancies in the M1 and M2 sites in olivine and orthopyroxene based on XRD and Mössbauer spectroscopy appeared to be in a good agreement. The temperatures of equilibrium cation distributions for olivine and orthopyroxene obtained from these techniques are consistent: 623 K (XRD) and 625 K (Mössbauer spectroscopy) for olivine and 1138 K (XRD) and 1122 K (Mössbauer spectroscopy) for orthopyroxene.
AB - We report the results of the complex study of the bulk interior of Bursa L6 ordinary chondrite using optical microscopy, scanning electron microscopy with energy dispersive spectroscopy, electron microprobe analysis (EMPA), X-ray diffraction (XRD), magnetization measurements, and Mössbauer spectroscopy. The main and minor iron-bearing phases and their chemical compositions were determined by these techniques. The detected iron-bearing phases in the bulk interior of Bursa L6 are the following: olivine; orthopyroxene; Ca-rich clinopyroxene; troilite; chromite; hercynite; ilmenite; the α2-Fe(Ni, Co), α-Fe(Ni, Co), and γ-Fe(Ni, Co) phases; and ferrihydrite resulting from meteorite terrestrial weathering. Using the EMPA, the values of fayalite and ferrosilite were obtained as ~25.2% and ~21.4%, respectively. The unit cell parameters for silicate crystals were determined from XRD, then the Fe2+ and Mg2+ occupations of the M1 and M2 sites in these crystals were estimated. Further calculations of the ratios of the Fe2+ occupancies in the M1 and M2 sites in olivine and orthopyroxene based on XRD and Mössbauer spectroscopy appeared to be in a good agreement. The temperatures of equilibrium cation distributions for olivine and orthopyroxene obtained from these techniques are consistent: 623 K (XRD) and 625 K (Mössbauer spectroscopy) for olivine and 1138 K (XRD) and 1122 K (Mössbauer spectroscopy) for orthopyroxene.
UR - http://www.scopus.com/inward/record.url?scp=85099603043&partnerID=8YFLogxK
U2 - 10.1111/maps.13597
DO - 10.1111/maps.13597
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AN - SCOPUS:85099603043
SN - 1086-9379
VL - 55
SP - 2780
EP - 2793
JO - Meteoritics and Planetary Science
JF - Meteoritics and Planetary Science
IS - 12
ER -