Introduction - Origin of Potassium-rich Silica-deficient Igneous Rocks - page 4

Fig. 1.3 a Chondrite-
normalised spidergram related
to mantle incompatible
elements in the K-rich rocks
(Group I) from West
Kimberley and Gaussberg
(darker shading). The solid
line at the bottom depicts
MORB values. b Chondrite-
normalised spidergram related
to mantle incompatible
elements in the K-rich rocks
(group II) from Toro-Ankole,
Africa (with standard
members in dark shadings;
for further explanation see
Chap. 3 ). The solid line at the
bottom depicts MORB values.
c Chondrite-normalised spid-
ergram related to mantle
incompatible elements in the
K-rich rocks (group III) from
Italy. The solid line at the
bottom depicts MORB values
(after Foley et al. 1987)

(a)

10 3

10 2

10 1

Ba Rb K Nb La Ce Sr Nd P Zr Ti Y

(b)

10 3

10 2

10 1

B R KN L C S N P Z Ti Y

(c)

10 3

10 2

10 1

Ba Rb K Nb La Ce Sr Nd P Zr Ti Y