Minor and Rare Earth Element Geochemistry of K-Rich Silica-Undersaturated Igneous Rocks - Origin of Potassium-rich Silica-deficient Igneous Rocks - page 237

Fig. 5.24 Chondrite-
normalized trace element
diagrams for the most basic
and most evolved samples
from the EK (a), K (b)HK
calc and calc-alkalic series
(c) from Ringgit-Beser (after
Edwards et al. 1993)

(a)

1000

E K series

100

New South Wales
Leucitite
(Continental potassic lava)

10

1

(b) 10000

K series

Alkaline lavas
Cameroon line (Oceanic sector)

1000

100

10

1

(c)

1000

HK Calc series
Calc series

100

10

Normal MORB

1

87 Sr/ 86 Sr ratios (0.70445 - 0.70549) and lowest 143 Nd/ 144 Nd

lavas have the highest

ratios (0.512674 0.512806). According to Edwards et al. the EK and high K-calc

series have high Sr and Nd isotope ratios which are within the range of K-series

-