Geoscience Reference
In-Depth Information
Table A.1
(
cont.
)
Cont.
crust
Upper
mantle
Ocean
Rivers
gl
−
1
)
gl
−
1
)
Element N M at
Chondr. CI Earth
Core
BSE
Unit
(
μ
(
μ
10
−
3
Re
75 186.21
40
75.3
0.23
0.280
0.270
ppm 7.20
×
ppm 1.70
×
10
−
6
Os
76 190.23
490
900
2750
3.430
3.430
10
−
6
Ir
77 192.22
455
835
2550
3.185
3.185
ppb
1.15
×
1.17
×
10
−
4
Pt
78 195.08
1010
1866
5700
7.070
7.070
ppb
9.85
×
10
−
6
2
×
10
−
3
Au
79 196.97
140
164
500
0.980
0.960
ppb
1.40
×
10
−
3
7
×
10
−
2
Hg
80 200.59
300
23.1
50
10
9.800
ppb
1.23
×
10
−
2
Tl
81 204.38
140
12.2
30
3.500
0.350
ppb
5.00
×
10
−
4
1
×
10
0
Pb
82 207.20
2.470
0.232
0.4
0.150
12.6
0.018
ppb
1.04
×
10
−
5
Bi
83 208.98
110
9.853
25
2.500
0.500
ppb
ppm 5.00
×
10
−
5
Th
90 232.04
0.029
0.054
0
0.079
5.6
0.006
ppm 3.20
×
10
0
4
×
10
−
2
U
92 238.03
0.0074
0.014
0
0.020
1.42
0.002
References
Martin, J.-M. and Meybeck, M. (1979) Elemental mass-balance of material carried by
major world rivers.
Mar. Chem.
,
7
, 173-206.
McDonough, W. F. and Sun, S.-S. (1995) The composition of the Earth.
Chem. Geol.
,
120
,
223-253.