Table 4
Locality, mineralogy and texture of amphibolites of the Povorotny Cape

Sample Locality and tectonic setting Mineral assemblages Texture
268/2 268/8 Blocks in tectonized olistostrome, Lagerny unit Hb + Pl Hb + Gr + Pl granoblastic granoblastic
270 Blocks in Main Serpentinite Melange Hb + Gr + Pl + Ep granoblastic
270/1   Hb + Pl granoblastic
270/2   Hb + Pl + Ep + Sph granoblastic
270/6   Hb +Pl+Ep+Sph granoblastic
270/12   Hb+Pl+ Act granoblastic
2313/2   Hb+Gr+Pl+Act granoblastic
2335/5   Hb+Pl+Ep+Sph+Ilm granoblastic
2335/12   Hb+Pl+Ep granoblastic a
2351   Hb+Pl+Ep granoblastic
2351/1   Hb+Pl+Ep+Sph+Ilm schistose
2349/2 Blocks in Kingiveem-4 unit Hb+Pl+Ep+Sph + Ilm granoblastic
2349/3   Hb+Pl+Ep+Sph + Ilm Granoblastic b
2349/4   Gr+Cpx+Hb+Pl granoblastic
2347/1   Hb+Pl+Ep+Sph + Ilm schistose
9435/5 Pebbles in Lagerny unit Hb+Pl+Ep+Sph granoblastic
9435/6   Hb+Pl+Ep+Sph granoblastic

Act- actinolite, Cpx - clinopyroxene, Ep - epidote, Gr - garnet, Hb-hornblende, Ilm - ilmenite, Sph - sphene (titanite); a - relics porphyritic texture, b - relics of gabbro-ophitic texture.

Table 4-1
Major element content (weight %) in amphibolites of the Povorotny Cape

Sample SiO2 TiO2 Al2O3 FeO* MnO MgO CaO Na2O K2O P2O5 Cr2O3 Loss Total
270/1 43.67 2.92 12.72 15.93 0.28 8.51 9.83 3.02 0.19 0.25 0.02 1.65 98.99
270/2 45.14 2.65 12.53 14.12 0.26 5.41 16.73 1.10 0.52 0.25 0.01 1.75 100.47
270/6 47.65 2.50 13.69 12.85 0.24 4.81 12.35 2.20 0.47 0.29 0.01 2.05 99.12
270/12 49.52 2.45 12.70 13.45 0.23 5.92 10.57 3.64 0.25 0.19 0.01 0.55 99.49
9410/13 52.05 1.24 15.11 11.43 0.20 7.03 5.02 4.99 0.16 0.17 0.01 2.40 99.82
9410/14 41.25 1.17 18.51 12.31 0.18 6.18 18.17 0.23 0.07 0.08 0.01 2.40 100.56
268/2 43.90 2.27 11.84 15.13 0.24 11.3 9.95 2.74 0.76 0.38 0.03 0.85 99.39
268/8 43.48 2.71 12.30 17.09 0.284 9.62 8.80 3.12 1.14 0.58 0.02 0.65 99.8
9435/5 45.61 1.68 13.11 14.31 0.25 9.07 11.51 2.52 0.15 0.13 0.01 2.11 100.44
2313/2 46.13 2.38 12.93 14.55 0.25 8.35 10.84 3.65 0.37 0.26 0.01 0.59 100.30
2347/1 46.88 2.35 15.07 12.25 0.20 5.19 13.02 2.58 0.66 0.32 0.02 1.68 100.21
2351/1 50.47 0.79 14.50 10.12 0.18 8.60 10.61 2.07 1.68 0.12 0.02 1.07 100.23
2349/2 39.17 3.67 11.17 19.75 0.30 8.63 14.54 1.19 0.29 0.28 0.02 1.35 100.36
2349/3 43.16 2.66 13.34 16.53 0.28 8.49 12.09 1.89 0.66 0.37 0.01 0.91 100.40
2349/4 44.60 2.80 12.51 16.99 0.24 7.84 11.77 2.21 0.27 0.33 0.01 0.91 100.47
2335/5 47.19 2.64 13.48 13.56 0.23 5.73 12.01 2.96 0.59 0.33 0.01 1.38 100.12
2335/12 46.30 2.21 13.20 13.02 0.22 6.91 11.86 3.01 0.52 0.30 0.01 1.34 98.91

Table 4-2
Rare earth element content (ppm) in amphibolites of the Povorotny Cape

Sample La Ce Pr Nd Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
2349/2 1.68 5.95 1.25 8.33 3.97 0.61 4.70 0.89 6.40 1.70 5.65 0.98 6.15 1.22
2349/3 6.20 17.0 2.78 15.5 6.0 0.12 3.90 0.69 5.00 1.40 4.90 0.90 6.10 1.29
2349/4 9.95 25.0 3.60 18.1 5.95 0.35 2.62 0.60 4.30 1.22 4.40 0.81 5.70 1.25
2347/1 10.1 25.3 3.60 16.9 5.10 2.41 8.80 1.23 7.30 1.65 4.60 0.64 3.70 0.58
2313/2 7.75 18.2 2.60 13.0 4.10 0.25 2.50 0.49 3.50 1.00 3.50 0.62 4.35 0.90
2335/5 9.40 23.8 3.30 15.4 5.10 0.24 2.75 0.55 4.00 1.10 4.00 0.68 4.70 0.92
2335/12 1.93 5.00 0.77 4.15 1.43 0.40 2.22 0.39 2.52 0.61 1.82 0.29 1.68 0.30
2344/3 1.40 4.30 0.78 4.6 1.76 0.71 3.30 0.59 3.95 1.00 3.10 0.54 3.48 0.60
9435/6 4.36 13.0 2.22 12.4 4.91 2.21 7.50 1.15 6.76 1.48 4.10 0.59 3.22 0.52
268/2 5.19 14.4 2.28 12.1 4.36 2.49 6.30 0.99 6.00 1.36 3.98 0.58 3.30 0.54
268/8 13.4 24.0 5.00 24.8 8.49 0.91 12.0 1.81 10.6 2.28 6.40 0.92 4.98 0.81
270/1 7.30 18.4 2.90 14.9 5.22 1.39 8.00 1.20 7.01 1.53 4.20 0.60 3.33 0.52
270/2 6.93 17.8 2.79 14.6 5.16 2.65 7.80 1.19 7.00 1.58 4.32 0.62 3.52 0.57
270/6 7.65 19.1 3.01 15.0 5.32 1.64 7.40 1.10 6.25 1.37 3.80 0.52 2.81 0.45
270/12 4.35 13.0 2.20 12.0 4.70 2.10 7.30 1.18 7.20 1.67 4.80 0.70 4.19 0.68

Table 4-3
Chemical composition and structural formulae of amphibole in amphiboltes of the Povorotny Cape

Sample SiO2 a TiO2 Al2O3 FeO*b MnO MgO CaO Na2O K2O Cl
2349/3 41.80 1.35 13.36 18.24 0.26 9.53 11.08 1.93 0.47 0.02
2313/2 42.83 2.17 12.92 15.73 0.16 10.73 10.76 2.32 0.23 0.01
2313/2 52.22 0.21 1.65 20.85 0.13 9.83 11.70 0.16 0.04 0.02
2351 42.25 0.97 12.26 22.19 0.23 7.89 10.96 2.02 1.52 0.00
2347/1 42.37 0.93 12.37 20.80 0.44 8.95 11.63 1.69 1.51 0.00
270/12 46.07 0.60 12.36 19.88 0.26 9.35 11.13 1.97 0.14 0.00
270/6 42.85 0.66 12.03 16.01 0.34 10.7 10.2 1.91 0.93 0.00
270/1 44.44 1.73 12.83 17.34 0.24 11.61 10.27 2.10 0.20 0.01
270 43..97 1.76 12.4 18.53 0.19 10.3 11.04 1.94 0.33 0.01
268/8 42.37 2.12 13.06 17.38 0.28 11.26 10.74 2.24 0.59 0.01
268/2 44..54 2.10 13.12 17.14 0.32 10.21 11.13 2.13 0.57 0.02
9435/5 47.12 0.63 12.65 16.25 0.36 9.83 11.13 2.44 0.04 0.01
Sample Si c AlIV Al VI Ti Fe2 Mn Mg Ca Na K
2349/3 6.28 1.72 0.65 0.15 2.29 0.03 2.14 1.78 0.56 0.09
2313/2 6.35 1.65 0.61 0.24 1.95 0.02 2.37 1.71 0.67 0.04
2313/2 7.86 0.14 0.16 0.02 2.62 0.02 2.20 1.89 0.05 0.01
2351 6.36 1.64 0.53 0.11 2.79 0.03 1.77 1.76 0.59 0.27
2347/1 6.32 1.68 0.49 0.10 2.59 0.06 1.99 1.80 0.49 0.28
270/12 6.64 1.36 0.74 0.06 2.40 0.03 2.01 1.72 0.55 0.02
270/6 6.53 1.47 0.69 0.07 2.04 0.04 2.43 1.66 0.56 0.18
270/1 6.42 1.58 0.60 0.19 2.09 0.03 2.50 1.58 0.59 0.04
270 6.42 1.58 0.56 0.19 2.26 0.02 2.24 1.73 0.55 0.06
268/8 6.22 1.78 0.48 0.23 2.13 0.04 2.46 1.69 0.64 0.11
268/2 6.42 1.58 0.65 0.23 2.06 0.04 2.19 1.72 0.59 0.10
9435/5 6.74 1.26 0.88 0.07 1.94 0.04 2.09 1.75 0.68 0.01

ahere and in other tables all oxides were determined in weight percents.
bhere and in other tables iron (FeO*) was determined as FeO.
ccations calculated on the basis of 23 oxygens

Table 4-4
Chemical composition and structural formulae of albite and plagioclase in amphiboltes of the Povorotny Cape

Sample SiO2 TiO2 Al2O3 FeO* MnO MgO CaO Na2O K2O An%
2349/3 64.99 0.01 23.10 0.08 0.02 0.04 1.93 9.57 0.47 17.00
2349/4 68.05 0.02 20.41 0.11 0.00 0.01 0.12 11.31 0.03 1.00
2313/2 69.11 0.01 21.38 0.56 0.05 0.04 0.23 9.74 0.12 2.00
2351 69.16 0.02 20.69 0.23 0.07 0.03 0.15 11.30 0.10 2.00
2347/1 64.68 0.01 24.52 0.57 0.00 0.23 0.36 9.03 2.75 18.00
268/8 60.25 0.00 26.22 0.18 0.00 0.00 7.12 7.59 0.23 48.00
270 68.97 0.07 20.78 0.29 0.00 0.00 0.35 11.2 0.11 3.00
9412/12 49.96 0.00 33.52 1.00 0.00 0.00 15.48 2.29 0.11 87.00
9435/5 69.44 0.00 18.37 0.20 0.02 0.01 0.10 11.57 0.03 1.00
Sample Si a Al Ca Na K Albite Anortite Orthoclase
2349/3 2.85 1.19 0.09 0.81 0.030 0.874 0.097 0.028
2349/4 2.97 1.05 0.01 0.96 0.002 0.992 0.006 0.002
2313/2 2.96 1.08 0.01 0.81 0.007 0.979 0.013 0.008
2351 2.97 1.05 0.01 0.94 0.006 0.987 0.007 0.006
2347/1 2.81 1.25 0.11 0.49 0.287 0.818 0.018 0.164
268/8 2.65 1.36 0.33 0.65 0.000 0.659 0.341 0.000
270 2.96 1.05 0.02 0.93 0.006 0.977 0.017 0.006
9412/12 2.24 1.77 0.74 0.19 0.000 0.211 0.789 0.000
9435/5 3.04 0.94 0.01 0.98 0.002 0.994 0.005 0.002

a cations calculated on the basis of 8 oxygens