Peraluminous sapphirine-cordierite pods in Mg-rich orthopyroxene granulite from southern India: Implications for lower crustal processes

► First report of unusual peraluminous sapphirines within Mg-rich orthopyroxene-granulites from Madurai Block, southern India. ► The sapphirine-cordierite pods suggest interaction of supracrustal rocks with ultramafic magmas. ► The possible heat source for the partial melting of lower crust and UHT metamorphism could be this ultramafic source.