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Home All issues Volume 197 (2026) BSGF - Earth Sci. Bull., 197 (2026) 10 Full HTML
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Table 4

Representative analysis of spinels. FeO and Fe2O3 have been recalculated from analytic microprobe FeOt; (b) indicates border, (c) indicates core, and (i) indicates inclusion.

Rock type Basanite Latite Lherzolite
Sample Sot22 HOL32 BIW88A MBA11 SAF88 BJM59A BIW805 BIW88
Comment C5 C6(b) C6 C1(i) C3 C5 C4 C5 C1 C1(b) C1(c) C3 C4 C5 C2 C2 C4 C4 (c) C6 (b) C7 C3 C1 C2
SiO2 0.00 0.14 0.01 0.09 0.09 0.00 0.07 0.11 0.05 0.02 0.00 0.01 0.04 0.72 0.02 0.00 0.01 0.01 0.04 0.02 0.03 8.52 0.02
TiO2 20.11 21.05 20.77 22.76 0.00 24.72 24.54 1.85 21.48 21.03 0.05 23.76 4.94 46.88 0.00 0.03 0.01 0.02 0.01 0.00 0.00 3.39 0.07
Al2O3 6.73 6.01 7.07 5.95 37.78 4.13 4.10 28.62 2.45 4.46 43.07 2.83 0.72 0.12 55.33 55.39 55.52 55.61 55.87 55.26 56.84 32.38 54.47
Cr2O3 0.67 0.50 0.64 1.43 28.56 0.40 0.31 24.73 0.91 1.92 21.67 0.12 0.01 0.04 9.51 9.77 9.45 9.57 9.06 9.43 10.26 13.69 9.57
V2O3 0.19 0.17 - - 0.02 - - - - - - - - - - - - - - - - - 0.00
FeO 42.86 44.66 40.65 44.63 10.28 47.10 46.83 19.61 44.42 42.71 17.05 46.25 58.02 42.39 8.69 8.79 8.34 8.64 8.54 8.81 9.43 25.73 11.48
Fe2O3c 23.63 20.75 22.79 19.31 4.41 18.66 19.08 12.33 25.29 23.47 2.85 22.68 35.01 0.00 4.08 3.65 4.27 3.91 3.94 4.10 2.21 0.00 4.09
MnO 0.63 0.50 0.48 0.63 0.15 0.80 0.76 0.42 0.85 0.70 0.38 0.78 0.57 5.93 0.06 0.08 0.16 0.11 0.09 0.07 0.08 0.32 0.24
MgO 4.74 3.84 6.47 5.29 17.89 4.50 4.63 11.73 3.82 5.03 13.76 4.40 0.00 0.01 20.52 20.46 20.78 20.63 20.68 20.42 20.33 11.56 18.61
CaO 0.00 0.06 0.20 0.01 0.00 0.03 0.06 0.04 0.16 0.08 0.00 0.11 0.01 0.95 0.03 0.00 0.00 0.00 0.03 0.00 0.00 2.30 0.01
ZnO 0.01 0.00 - - 0.00 - - - - - - - - - - - - - - - - - 0.01
Na2O 0.06 0.02 0.06 0.04 0.01 0.02 0.00 0.00 0.00 0.00 0.01 0.07 0.00 0.00 0.00 0.00 0.00 0.00 0.03 0.00 0.00 0.75 0.02
K2O 0.00 0.04 0.03 0.00 0.00 0.02 0.00 0.01 0.05 0.00 0.00 0.02 0.00 0.02 0.02 0.00 0.00 0.00 0.00 0.00 0.00 0.07 0.00
NiO 0.09 0.06 0.14 0.08 0.27 0.06 0.12 0.07 0.12 0.01 0.34 0.04 0.06 0.00 0.36 0.35 0.41 0.37 0.44 0.36 0.34 0.25 0.36
BaO 0.03 0.00 - - 0.59 - - - - - - - - - - - - - - - - - 0.09
Total 99.76 97.80 99.30 100.22 100.05 100.44 100.50 99.52 99.60 99.43 99.18 101.06 99.38 97.06 98.62 98.52 98.95 98.87 98.74 98.47 99.52 98.96 99.04
Si 0.00 0.04 0.00 0.03 0.02 0.00 0.02 0.03 0.01 0.01 0.00 0.00 0.01 0.22 0.00 0.00 0.00 0.00 0.01 0.00 0.01 2.01 0.00
Ti 4.27 4.59 4.37 4.80 0.00 5.27 5.23 0.34 4.70 4.51 0.01 5.08 1.14 10.90 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.60 0.01
Al 2.24 2.05 2.33 1.97 10.09 1.38 1.37 8.23 0.84 1.50 11.58 0.95 0.26 0.04 13.76 13.78 13.75 13.78 13.85 13.76 13.95 9.02 13.70
Cr 0.15 0.11 0.14 0.32 5.12 0.09 0.07 4.77 0.21 0.43 3.91 0.03 0.00 0.01 1.59 1.63 1.57 1.59 1.51 1.58 1.69 2.56 1.61
V 0.04 0.04 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
Fe3+ 5.02 4.53 4.79 4.07 0.75 3.98 4.07 2.26 5.53 5.04 0.49 4.85 13.43 0.00 0.65 0.58 0.67 0.62 0.62 0.65 0.35 0.00 0.66
Fe2+ 10.12 10.83 9.50 10.46 1.95 11.17 11.09 4.00 10.80 10.18 3.25 11.00 9.00 10.96 1.53 1.55 1.47 1.52 1.50 1.56 1.68 5.09 2.05
Mn 0.15 0.12 0.11 0.15 0.03 0.19 0.18 0.09 0.21 0.17 0.07 0.19 0.15 1.55 0.01 0.01 0.03 0.02 0.02 0.01 0.01 0.06 0.04
Mg 2.00 1.66 2.70 2.21 6.04 1.90 1.96 4.27 1.66 2.14 4.68 1.87 0.00 0.00 6.45 6.44 6.51 6.47 6.48 6.43 6.31 4.07 5.92
Ca 0.00 0.02 0.06 0.00 0.00 0.01 0.02 0.01 0.05 0.02 0.00 0.03 0.00 0.31 0.01 0.00 0.00 0.00 0.01 0.00 0.00 0.58 0.00
Zn 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
SUM 24.00 24.00 24.00 24.00 24.00 24.00 24.00 24.00 24.00 24.00 24.00 24.00 24.00 24.00 24.00 24.00 24.00 24.00 24.00 24.00 24.00 24.00 24.00
Fe/Fe+Mg 0.88 0.90 0.84 0.87 0.31 0.89 0.89 0.59 0.91 0.88 0.44 0.89 1.00 1.00 0.25 0.25 0.25 0.25 0.25 0.26 0.24 0.56 0.31
Cr/Cr+Al 0.06 0.05 0.06 0.14 0.34 0.06 0.05 0.37 0.20 0.22 0.25 0.03 0.01 0.18 0.10 0.11 0.10 0.10 0.10 0.10 0.11 0.22 0.11
Fe2+/Fe3+ 2.02 2.39 1.98 2.57 2.59 2.80 2.73 1.77 1.95 2.02 6.66 2.27 0.67 - 2.36 2.68 2.17 2.45 2.41 2.39 4.85 #DIV/0! 3.12
Mg# 9.96 7.92 13.73 10.60 63.50 8.72 9.00 37.43 7.92 10.54 44.66 8.69 0.00 0.02 70.26 69.95 71.35 70.48 70.77 69.85 68.31 31.00 61.86

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