Geoscience Reference
In-Depth Information
a)
Migmatites
Metafelsic
Metaintermediate
Metamafic
Metaultramafic
Schists & gneisses
Metasediments
U (ppm)
Th (ppm)
Th (ppm)
Th/U=1
10
6
10
6
10
6
Ilm/Rut
10
5
10
5
10
5
10
4
10
4
10
4
Zr
Sph
Rut
Zr
Zr
10
3
10
3
10
3
Sph
Sph
Th/K=1
U/K=1
10
2
10
2
10
2
Amp
Ilm
Biot
Biot
Amp
Biot
Amp/Pyx
Na Fsp
Pyx
Na Fsp
Pyx
10
1
Mag
10
1
10
1
Mag
Mus
K Fsp
Mag
Ol
K Fsp
Qtz
Na Fsp
Qtz
Qtz
Ol
Ol
10
0
10
0
10
0
Ca Fsp
K Fsp
100
50
0
Ca Fsp
Ca Fsp
10
-1
10
-1
10
-1
K (%)
10
-2
10
-2
10
-2
Ilm/Rut
Mus
Mus
Ilm Rut
10
-3
10
-2
10
-1
10
0
10
1
10
2
10
-3
10
-2
10
-1
10
0
10
1
10
2
10
-2
10
-1
10
0
10
1
10
2
10
3
10
4
10
5
10
6
Average crust
K, Th & U ore minerals
Common minerals
Data comprising (a)
b)
K (%)
K (%)
U (ppm)
Heavy mineral sands
U & Th ores
U (ppm)
Th (ppm)
Th (ppm)
Cof
10
6
10
6
Ura
Cof
Bra
10
6
10
6
Cof
Tho
Tho
Mon
Mon
10
5
10
5
10
5
10
5
10
4
10
4
10
4
10
4
Bra/Ura
Mon
Tho
Ura
10
3
10
3
10
3
10
3
Ura
10
2
10
2
10
2
10
2
Pyx
Zr
Mag
Qtz
10
1
10
1
10
1
10
1
Sph
Mus
Biot
Amp
Cof
10
0
10
0
10
0
10
0
Ca Fsp
Ol
10
-1
10
-1
10
-1
10
-1
Na Fsp
Mon
Syl/Car
10
-2
10
-2
10
-2
10
-2
Car
Syl
Bra
Car
Syl
Bra
K Fsp
100
50
Tho
0
10
-3
10
-3
10
-2
10
-2
10
-1
10
-1
10
0
10
0
10
1
10
1
10
2
10
2
10
-3
10
-2
10
-1
10
0
10
1
10
2
K (%)
10
-2
10
-1
10
0
10
1
10
2
10
3
10
4
10
5
10
6
K (%)
K (%)
U(ppm)
Figure 4.13
Radioelement content of metamorphic rocks and selected minerals and ores. Data compiled from numerous published sources. (a) Data subdivided according to lithotype and
geochemistry. (b) Comparison between various lithotypes, K, U and Th ores and heavy mineral sand deposits. See caption to
Fig. 4.12
for abbreviations.
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