3 Isotope Geochemistry of River Water 39
10 ~
MULLICA
10 z
lOZ I
I0 L.
L~I ~ 103[
I
TAMAR - SPRINGS
C 1~
10
10 ~
10 ~
10 I I
I
I
i
I
I
I
|
J
I~ Ce
NCl Sm Eu Gd
Dy
Er
Vb Lu
Fig. 3.8. REE distributions in fiver waters. (Elderfield et al. 1990)
and LREE appear to be preferentially enriched in the coarser particles. This
fractionation mechanism has important consequences for the Nd isotope system
and Sm/Nd ratio. High Sm/Nd ratios are to be expected in the dissolved fraction,