RUSSIAN JOURNAL OF EARTH SCIENCES, VOL. 15, ES1004, doi:10.2205/2015ES000550, 2015

Table 7. Average Chemical Composition (wt %) of Amphiboles in Xenoliths From the Roca Negra Volcano in Comparison With Amphibole Compositions in Other Rocks
Component 1 2 3 4 5 6 7 8 9 10 11 12 13
$\mathrm{SiO_2}$ 38.46 39.92 40.10 38.65 42.57 39.85 41.15 40.89 42.21 42.92 43.90 43.76 39.77
$\mathrm{TiO_2}$ 4.58 3.78 4.33 2.97 4.79 7.35 4.14 5.64 1.02 2.62 3.52 2.97 5.67
$\mathrm{Al_2O_3}$ 13.50 14.54 13.03 16.61 11.05 12.69 14.61 14.25 15.15 14.56 13.63 14.05 14.06
FeO* 16.29 13.99 14.08 13.08 10.38 9.50 8.05 6.23 4.33 3.40 3.81 4.02 11.25
MnO 0.35 0.00 0.00 0.07 0.45 0.43 0.05 0.09 0.07 0.04 0.05 0.07 0.12
MgO 9.66 10.47 11.65 13.65 10.66 10.27 14.46 14.97 17.34 17.04 16.85 16.79 11.47
CaO 10.76 11.87 10.71 11.05 12.63 13.03 11.42 11.35 11.62 10.96 10.82 10.56 10.64
$\mathrm{Na_2O}$ 3.17 3.15 2.92 2.44 2.97 2.63 2.36 2.15 3.32 3.31 3.85 3.49 2.74
$\mathrm{K_2O}$ 1.32 0.32 1.08 1.26 0.84 0.83 2.17 2.13 0.06 1.63 0.67 1.35 1.40
$\mathrm{Cr_2O_3}$ - 0.26 - - - - 0.17 0.89 0.82 1.06 0.86 0.18 -
N 6 6 5 1 1 1 3 2 3 1 1 1 2
Note: the Roca Negra: 1 – sample RC1/10, 2 – sample RC1/5, 3 – sample RC10/3 (this publication), 4 – amphibole [Tournon, 1968], 5, 6 – sample 15126: 5 – grain core, 6 – grain margin [Sanchez, 1983], 7–9 – central Spain: 7 – K–Ti pargasite in glimmerite, 8 – K-kaersutite in micaceous lherzolite, 9 – pargasite in spinel lherzolite [Ancochea and Nixon, 1987], 10–11 – spinel lherzolite xenoliths [Ionov et al., 1984], 12 – pargasite in lherzolite xenolith [Dawson and Smith, 1977], 13 – kaersutite in xenoliths in basalts from the Tien Shan [Dobretsov and Dobretsova, 1975].

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Citation: Grachev A. F. (2015), Pyroxenite xenoliths in basalts of the Roca Negra volcano, Catalonia, Russ. J. Earth Sci., 15, ES1004, doi:10.2205/2015ES000550.
 

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