Table 1. Table showing composition of Forsterite based on EPMA point analysis. Table 2. Isotopic data obtained from the analysis of carbonatites of Sung valley, Meghalaya. The standard deviation for δ13C and δ18O is ± 0.1‰. Isotopic ratios of stable isotopes of C and O. Table 3. Rare earth elements concentration of Sung Valley carbonatites, analysed by ICP-MS (rare earth elements in ppm).