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

Table 6. Chemical Composition (wt %) of Micas in Xenoliths From the Roca Negra Volcano in Comparison With Composition of Micas in Other Ultramafic Rocks
Compo- 1 2 3 4 5 6 7 8 9 10 11 12 13 14
nent
$\mathrm{SiO_2}$ 35.46 37.07 37.33 36.62 37.41 37.53 36.94 37.87 36.57 38.97 38.91 37.68 39.98 41.0–42.7
$\mathrm{TiO_2}$ 5.45 2.30 4.77 1.20 5.91 6.23 2.70 2.66 9.20 2.86 3.67 5.53 9.13 1.07–1.59
$\mathrm{Al_2O_3}$ 16.58 17.46 16.12 17.30 16.74 16.76 17.03 16.40 15.84 13.80 14.62 16.18 13.45 11.7–13.2
$\mathrm{Cr_2O_3}$ 0.19 0.05 0.60 0.32 0.19 0.35 0.07 0.70 – 0.15 0.17 0.43 0.71 0.19–0.81
FeO* 15.35 11.78 14.30 10.91 6.91 6.71 8.32 5.46 12.82 8.18 9.88 9.72 3.57 2.72–4.57
MnO 0.03 0.12 0.50 0.13 0.07 0.05 0.10 0.02 – 0.04 0.05 0.01 0.04 0.0–0.5
MgO 13.64 17.82 15.66 19.78 18.40 18.41 19.62 21.96 12.87 19.44 17.72 17.53 18.73 23.9–25.5
CaO 0.13 0.00 0.00 0.00 0.03 0.05 0.11 0.07 – – 0.07 0.04 – 0.05
$\mathrm{Na_2O}$ 1.30 1.97 0.94 2.34 0.56 0.61 0.46 0.13 1.11 0.49 0.30 0.52 0.06 0.17–0.43
$\mathrm{K_2O}$ 8.72 8.48 8.56 9.53 9.83 9.73 10.05 10.32 8.92 9.51 9.83 9.46 9.64 9.27–9.97
Note: the Roca Negra: 1 – average biotite composition (9 analyses); 2 – average phlogopite composition (4 analyses); 3, 4 – phlogopite [Sanchez, 1983], 5–7 – central Spain, 5 – average phlogopite composition in glimmerites (10 analyses), 6 – average phlogopite composition in spinel lherzolites (5 analyses), [Ancochea and Nixon, 1987], 7, 8 – phlogopite in phlogopite pyroxenite xenoliths from Roccamonfina volcano, Italy (7 and 5 analyses) [Giannetti and Luhr, 1990], 9 – phlogopite in spinel lherzolite xenolith in basalts at the Bartoi River, Baikal Rift, Russia [Ionov and Hofmann, 1995], 10 – phlogopite in glimmerite in peridotite from the Bohemian Massif [Becker et al., 1999], 11 – phlogopite in xenolith form the Roberts Victor kimberlite pipe [MacGregor, 1979], 12 – xenolith of micaceous websterite [Lasko and Sharkov, 1988], 13 – garnet peridotite, Tanzania [Dawson, 1972], 14 – variations in mica composition in metasomatic zones in peridotites [Dawson and Smith, 1977].

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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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