Minor and Rare Earth Element Geochemistry of K-Rich Silica-Undersaturated Igneous Rocks - Origin of Potassium-rich Silica-deficient Igneous Rocks - page 211

15 N value of lamproites and lamprophyres (closed symbols) and
phlogopite separates (open symbols) from the Gondwana basin and of ultrapotassic rocks from
Italy (cross symbols; data from Gupta et al. (2002). Field sources: mantle-derived material from
Javoy et al. (1984), Boyd et al. (1987), Cattigny et al. (1997), Marty and Humbert (1997); meta-
sedimentary rocks from Jenner et al. (1990); S-type granites from Boyd et al. (1993); organic
material from Peters et al. (1978); and ultrama c-alkaline-carbonatite of the Kola Peninsula from
Dauphas and Marty (1999, after Jia et al. 2003)

Fig. 5.1 N contents and δ

Fig. 5.2 Plot of 87 Sr/ 86 Sr versus 1/Sr for Raniganj and Jharia ultrapotassic rocks in eastern India.
Sources Raniganj data (Middlemost et al. 1988), Jharia data (Rock et al. 1992), and average upper
continental crust (Taylor and Mclennan 1985; Faure 1977)