Mg and Ca x-ray elemental maps showing the distribution of olivine (bright Mg) and augite (bright Ca) phenocrysts in ankaramite from Deccan Traps, Mumbai. The maps were generated by x-rays emitted from the sample through interaction with an electron beam in an EPMA. They are high-resolution and low-magnification images acquired using WDS and by moving the stage under a fixed electron beam (stage-rastering).

I am an igneous and metamorphic petrologist. I use major element modeling and thermobarometric techniques to study the origin and evolution of mantle-derived melts (basaltic primary magmas) that interact with wall rock and undergo fractional crystallization while ascending through the upper mantle and crust. I also study high pressure-temperature (P-T) metamorphism of rocks such as eclogite and granulite to understand the tectonic evolution of mountain belts by calculating P-T-time paths using thermodynamics, phase equilibria, monazite chemical dating, and garnet diffusion modeling. The primary analytical tool I use is the electron probe microanalyzer (EPMA) that provides high-resolution images, elemental maps, and complete chemical analysis at the micrometer-scale resolution. Following are my research highlights: