Ratio

BD1

(a)

BD2

(a)

Av. Bastar

Granitoids

(b)

Primordial

Mantle

(c)

Average Crust

(d)

Nb/La

0.62

0.61

0.46

1.01

0.46

Nb/Ce

0.26

0.20

0.21

0.39

0.30