Geology Reference
In-Depth Information
Table 2.18 Analyses of melanite and Mg-rich ankarite
SiO
2
FeO
a
TiO
2
Al
2
O
3
Fe
2
O
3
Re
2
O
3
SrO
MnO
MgO
CaO
Na
2
O
2
O
2
Total
1
35.70
17.10
1.31
0.19
32.80
2.64
10.30
100.04
2
32.50
22.30
0.86
0.31
32.50
5.72
5.81
100.00
3
32.82
19.44
0.85
0.21
32.18
0.08
7.19
4.84
97.61
4
27.03
19.39
0.52
1.13
31.67
0.02
17.49
1.59
98.84
5
5.45
0.02
17.07
26.44
0.01
49.24
0.03
0.02
98.32
6
7.70
11.40
5.70
23.50
2.50
0.60
48.70
0.03
100.13
7
11.40
10.60
3.80
25.10
1.00
0.30
48.20
0.05
100.45
a
FeO indicates total FeO + Fe
2
O
3
contents
1
-
2 Melanite garnets from a leucite-tephrites, Tavalato, Rome (Baldridge et al. 1981)
3
-
4 Melanite garnets from a melilitite lava occurring at Prete Della Scimmia, Mt. Vulture (Melluso et al. 1996)
5 Magnesium ankarite from a lamproite occurring at Mohanpur, Damodar Valley coal
eld (West Bengal, India, Gupta et al. (1983). Also contains 0.02 wt%
Cl and 0.02 wt% P
2
O
5
6
-
7 Perovskites from lamproitic rocks of Leucite-Hills, Wyoming (U.S.A.) (Carmichael 1967). Re
2
O
3
refers to Rare Earth Oxides
Search WWH ::
Custom Search