Minor and Rare Earth Element Geochemistry of K-Rich Silica-Undersaturated Igneous Rocks - Origin of Potassium-rich Silica-deficient Igneous Rocks - page 230

2000

1000

100

SMOKY BUTTE

S.E. SPAIN

10

W. KIMBERLEY

La Ce Sm Eu Tb Yb

Fig. 5.17 The chondrite-normalized REE patterns of K-rich rocks from Smokey Butte compared
with those of rocks from S.E. Spain and W. Kimberley, Australia (after Mitchell et al. 1987)

40

16

Highwood Mts.

39.5
39

Smoky Butte
Navajo
Grazy Mts.
Haystack Butte
Leucite Hills
SE Spain

Roccamonfina

Gaussberg

WA lamproite

Vulsini Rocca-
monfina

15.8

Vulsini
Kerguelen

38.5
38

15.6 Gaussberg

Sunda Arc

626 b

626 b

37.5 15.4

WA lamproite Kerguelen

Geochron

622

37

622

15.2

36.5

36

15

15 16 17 18 19 20 15 16 17 18 19 20

206 204 206 204

/ /

Pb Pb Pb Pb

Fig. 5.18 Pb isotopic compositions for alkalic magmatic rocks from Highwood Mountains and
other localities (after O ' Brien et al. 1991)