Garnets - Rare Earth Elements in Ultramafic and Mafic Rocks and their Minerals - page 49

Table 1.9 REE compositions of garnets from gabbros, and volcanogenic rocks from some provinces, complexes and manifestations (ppm).

Ivrea Verbano complex, Italy

[Mazzucchelli et al., 1992], IPMA

MP1(c) MP1(c*) MP3(p) MP5(p) MO95(c) MP6(c) MP9(c) MZ145(c) MP12(p) MP13(p) MP18(p)

Element Gabbros

La N.d. N.d. N.d. N.d. N.d. N.d. N.d. N.d. N.d. N.d. N.d.

Ce 0,180 0,720 0,410 0,570 1,460 0,500 0,940 0,180 0,120 0,090 0,070

Pr N.d. N.d. N.d. N.d. N.d. N.d. N.d. N.d. N.d. N.d. N.d.

Nd 0,730 1,160 2,060 1,820 2,320 2,660 7,250 1,440 1,360 2,870 1,740

Sm 2,340 1,780 3,600 2,700 2,320 2,630 5,810 1,090 3,720 5,590 4,060

Eu 1,870 1,050 1,670 1,320 3,010 4,510 6,140 2,410 1,560 1,890 1,670

Gd N.d. N.d. N.d. 8,230 N.d. N.d. N.d. N.d. N.d. N.d. N.d.

N.d. N.d. N.d. N.d. N.d. N.d. N.d. N.d. N.d. N.d.

Tb N.d.

Dy 12,42 15,09 17,37 15,20 8,480 8,880 11,78 3,120 16,31 22,04 30,07

Ho N.d. N.d. N.d. N.d. N.d. N.d. N.d. N.d. N.d. N.d. N.d.

Er 8,210 12,55 9,360 11,10 4,820 5,280 7,890 2,770 9,790 14,12 21,11

Tm N.d. N.d. N.d. N.d. N.d. N.d. N.d. N.d. N.d. N.d. N.d.

Yb 10,34 15,13 8,640 10,93 4,360 4,310 8,290 2,890 10,44 15,01 21,88

Lu N.d. N.d. N.d. N.d. N.d. N.d. N.d. N.d. N.d. N.d. N.d.

Total 36,1 47,5 43,1 51,9 26,8 28,8 48,1 13,9 43,3 61,6 80,6

(Ce/Yb) n 0,005 0,012 0,012 0,013 0,087 0,030 0,029 0,016 0,003 0,002 0,001

( Continued )