Rachold: Major. Trace and Rare Earth Element Geochemistry
207
1995). The average trace metal concentrations presented here are in excellent agreement with
data from the Lena delta reported by Martin et al. (1993), except for Ni (Table 3).
Table 2: Mineral phases observed in the SPM from Lena, Yana, and Khatanga rivers.
~
0..
(f)
CO
C
(])
...J
major component
minor component
100
8
~
0
6
Q)
10
E 4
:J
'0 2
>
0 1
0 .1
Lena SPM
quartz
K-feldspar
plagioclase
illite
illite-smectite
mixed-layer
amphibole
10
100
grain-size (J.lm)
Cd
0
Yana SPM
quartz
K-feldspar
plagioclase
chlorite
illite
MnO
0.01
0 .001
0.001
0.01
0.1
average shale
Khatanga SPM
10
quartz
plagioclase
pyroxene
quartz
illite
100
Figure 3: Average chemical composition of Lena SPM. The x-axis corresponds to the composition of average
shale (Wedepohl, 1971 and 1991). The diagonal represents the straight line of identical values. Al normalized
concentrations based on weight ratios (major elements) and weight ratio' 10 4 (trace elements) are displayed. The
grain-size distribution (volume %) is shown in the upper left corner.