Geology Reference
In-Depth Information
D.4 Comparisons between the upper crust models of Grigor'ev
(2007) and Rudnick and Gao (2004)
Table D.8 shows a comparison between the chemical composition of the crust pro-
vided by Rudnick and Gao (2004) and the one generated from the mineralogical
composition of Grigor'ev (2007) derived from a mass balance. The values are ex-
pressed in grams of substance per gram of crust, since this is the most readily
accepted way of expressing the crust's chemical composition. As a result
j
is mul-
tiplied by the molecular weight of each substance MW
j
.
Table D.8: Comparison of Rudnick and Gao (2004) chemical composition of
the upper Earth's crust with the one generated by Grigor'ev (2007) according
to Eq. 10.1.
Element
Rudnick and Gao (2004)
From Grigor'ev (2007)
Difference
^
j
MW
j
, g/g
j
MW
j
, g/g
(^
j
-
j
)/^
j
, %
O
4.72E-01
4.76E-01
-0.76
Si
3.09E-01
2.86E-01
7.18
Al
8.15E-02
7.02E-02
13.86
Fe
3.92E-02
3.58E-02
8.59
Na
2.73E-02
1.99E-02
27.08
Ca
2.57E-02
3.86E-02
-50.54
K
2.32E-02
2.43E-02
-4.68
Mg
1.50E-02
2.25E-02
-50.18
Ti
3.84E-03
1.50E-03
60.95
C
1.99E-03
8.22E-03
-313.26
Mn
7.74E-04
6.02E-05
92.22
P
6.55E-04
2.53E-04
61.43
Ba
6.28E-04
5.84E-06
99.07
S
6.20E-04
6.13E-04
1.19
F
5.57E-04
1.09E-03
-95.46
Cl
3.70E-04
1.19E-03
-222.54
Sr
3.20E-04
8.13E-07
99.75
Zr
1.93E-04
4.98E-05
74.18
V
9.70E-05
Cr
9.20E-05
8.83E-07
99.04
Rb
8.40E-05
N
8.30E-05
Zn
6.70E-05
3.11E-07
99.54
Ce
6.30E-05
8.18E-06
87.01
Ni
4.70E-05
4.07E-07
99.13
La
3.10E-05
3.91E-06
87.39
Cu
2.80E-05
4.64E-07
98.34
Nd
2.70E-05
1.57E-06
94.20
Li
2.40E-05
5.66E-10
100.00
Y
2.10E-05
9.98E-07
95.25
Ga
1.75E-05
Co
1.73E-05
2.98E-09
99.98
B
1.70E-05
1.45E-06
91.48
Pb
1.70E-05
4.84E-07
97.15
Sc
1.40E-05
1.83E-11
100.00
Continued on next page :::
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