Composition of the major geological units - Geochemistry: An Introduction - page 301

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

Data sources: solid Earth: McDonough and Sun (1995) ; ocean: GERM website; rivers: mostly Martin and
Meybeck (1979) .

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.