Full text - Dipartimento di Scienze della Terra - Sapienza

268 M.R. GHIARA, C. PETTI and P. MORBIDELLI
TABLE 3b
Trace element contents (ppm) in latitic scories from the Fondo Riccio volcano.
F1 F2 F3 F4 F4' F5 F6 F7 F8 F9 F 10 F 11
Li 17 21 18 21 21
23 24 16 19 18
Rb 370 355 305 258 270 270 278 260 327 293 305 300
P b 14 21 23 33 35 36 31 37 31 36 43
Sr 880 890 900 920 853 855 845 835 876 880 905 835
Ba 1760 1765 1690 1695 2037 1700 1727 1730 2275 1710 1850 1740
y 28 28 28 30 29 27 31 29
Zr 215 210 220 215 292 215 215 220 272 225 245 240
V 210 220 215 217 160 206 198 131 177 202 195 171
Nb 32 30 30 33 40 32 32 34
Cr 23 22 28 19 11
16 31
23 24
Co 17 18 18 17 17 18 15 14
16 17
Ni 10 8 10 10 15 8 7 10 16 10 11 11
Zn 89 94 92 94 90
90 92
96 96 95
19
27
93
29
42
14
41
53
25
43
39 28 29
34 36 36
La 56.7 57.8 56.0 56.9 59.2 54.0 61.3 61.9 58.5 63.0 56.1 59.9
Ce 114.1 114.6 113.5 110.6 116.2 110.6 118.3 116.2 114.1 119.0 109.1 119.5
Nd 50.1 50.8 49.1 51.8 51.2
52.7 52.3 52.3 n.d. 51.1 50.0
Sm 10.3 10.2 10.3 10.6 10.2 10.1 10.9 10.5 10.3 n.d. 10.1 10.1
Eu 2.40 2.40 2.40 2.40 2.40 2.30 2.50 2.40 2.40 n. d. 2.50 2.40
Gd 7.40 7.40 7.40 7.90 7.50 7.30 8.30 8.00 7.80 n. d. 7.60 7.10
Dy
5.65 5.34 5.54 5.37 5.46 5.73 5.65 5.64 n.d. 5.51 5.38
Er 2.59 2.58 2.55 2.66 2.60 2.53 2.72 2.68 2.59 n. d. 2.61 2.56
Yb
2.40 2.36 2.62 2.54 2.42 2.67 2.55 2.56 n.d. 2.43 2.50
Lu 0.39 0.37 0.39 0.37 0.40 0.37 0.38 0.37 0.40 n.d. 0.38 0.41
5.45
2.43
n. d.: not detected
47.4
24
14
25
Alz03
15
Na20
20
10 bA
15
••
••
5
·- '• • ·-
.. .
KzO
I 0
0 2 4 6 8 0 2 4 6 8
Fig. Sa- Vari ation diagrams [A1203 and Na20 (wt%) vs K20 (wt%)] of the scori a ceou s fragments from Fondo Riccio (e),
an alcime this work (L'l)
K,O
500 50
400
Rb
300 Fl •
200
100
K20
2 3 4 5 6 7 8
Pb
• •
40-
• • •
30- •
•
20- • •
10-
0
Fl
K20
2 3 4 5 6 7 8
Fig. 5b - Variation diagrams [Rb and P b (pp m) vs K20 ( wt%)] of the scoriaceou s fragment s from Fondo Riccio.