Abstract
K-Rb relations in the major alkaline suites from the Eastern Ghats Precambrian belt of India have been studied. All the suites show progressive enrichment of Rb with differentiation, but the Sivamalai suite with a dominance of feldspathoidal members has extremely low Rb concentrations. The K/Rb ratios, except those for Kunavaram, lie above the MT for average igneous rocks. Possible cause for fluctuation in K/Rb is discussed. The high K/Rb ratio is a possible inherent character of the magmas corresponding to their derivation from deeper parts of the upper mantle.
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