Bjurböle L/LL4 ordinary chondrite properties studied by Raman spectroscopy, X-ray diffraction, magnetization measurements and Mössbauer spectroscopy

Applications of Mössbauer Spectroscopy in Meteoritical and Planetary Science, Part I: Undifferentiated Meteorites

“…The values of the distribution coefficient and the temperature of equilibrium cation distribution in in orthopyroxene crystals in ordinary chondrites determined by means of X-ray diffraction and Mössbauer spectroscopy (data were taken from References [100,101,107,112]). Classifications of H, L, and LL ordinary chondrites using the plot of fayalite vs. the Fe 0 /Fe total (Adapted from Reference [36]) with indication of Chelyabinsk LL5, No 2, Kemer L4, Bursa L6 and Annama H5 positions using the initial relative metallic iron fractions obtained from Mössbauer spectroscopy in [84,99,100,105] by asterisks and arrows (a) and the plot of the initial relative metallic iron fraction (Fe 0 +Fe 3+ )/Fe total obtained from the total relative areas of metallic phases plus ferric compounds vs. fayalite ( -H ordinary chondrites, -L ordinary chondrites, -LL ordinary chondrites data obtained by Mössbauer spectroscopy with a low velocity resolution, data were taken from [56,61,62,87,105,[119][120][121][122]; -H ordinary chondrites, -L ordinary chondrites, -LL ordinary chondrites data obtained by Mössbauer spectroscopy with a high velocity resolution, data were taken from [100,101,107,112]), symbols corresponding to Chelyabinsk LL5, No 2, Kemer L4, Bursa L6, and Annama H5 are indicated accordingly (b). Fayalite values were taken from MBD.…”

“…Application of Mössbauer spectroscopy with a high velocity resolution increases the quality of the complex spectra of ordinary chondrites and revealing new spectral components which corresponding compounds were found by complementary techniques. A comparison of the Mössbauer spectra of Chelyabinsk LL5 and Bjurböle L/LL4 meteorites measured with a low velocity resolution [73,104] and with a high velocity resolution [106,107] is shown in Figure 34. The authors of [73] decomposed the Chelyabinsk LL5 spectrum using two magnetic sextets and three quadrupole doublets related to the following compounds: (i) kamacite (δ = 0.00 mm/s, H eff = 372 kOe, A = 1%); (ii) troilite (δ = 0.75 mm/s, H eff = 309 kOe, A = 11%); (iii) olivine (δ = 1.14 mm/s, ∆E Q = 2.94 mm/s, A = 61%); (iv) pyroxene (δ = 1.14 mm/s, ∆E Q = 2.10 mm/s, A = 24%); and (v) Fe 3+ compound (δ = 0.48 mm/s, ∆E Q = 0.62 mm/s, A = 3%).…”

“…Further, modal analysis for the Mössbauer spectra of equilibrated H, L, and LL ordinary chondrites measured with a high velocity resolution in [84,[98][99][100][101]106,107,111] and fitted using a simulation of the full static Hamiltonian and minor spectral components is shown in Figure 39. The total relative areas for: (i) the α 2 -Fe(Ni, Co), α-Fe(Ni, Co) and γ-Fe(Ni, Co) phases; (ii) ferric compounds and the M1 and M2 sites in (iii) olivine; (iv) orthopyroxene; and (v) clinopyroxene; (vi) troilite and Fe 1−x S; (vii) chromite; (viii) hercynite; and (ix) ilmenite were used.…”

“…These equations were used for T eq calculations for olivine and orthopyroxene in ordinary chondrites considered in [100,101,107,112] and references therein. The T eq values deduced from Mössbauer spectroscopy were compared with T eq values obtained using XRD data and listed in Tables 2 and 3 for olivine and orthopyroxene, respectively.…”

“…The values of the distribution coefficient and the temperature of equilibrium cation distribution in olivine crystals in ordinary chondrites determined by means of X-ray diffraction and Mössbauer spectroscopy (data were taken from References [100,101,107,112]). Then, the use of Mössbauer parameters (relative areas of spectral components) for ordinary chondrites classification was continued for the results obtained by Mössbauer spectroscopy with a high velocity resolution considered first in [77] and continued in [83,99,106,107,111]. In this way the most appropriate plot is based on the total relative area of spectral components assigned to the α-Fe(Ni, Co) and γ-Fe(Ni, Co) phases and ferric compounds (in the case of low weathering grade) versus the total relative area of the spectral components related to the M1 and M2 sites in olivine.…”