Mark Kendrick is a QEII research fellow at the University of Melbourne School of Earth Science. His work uses noble gas isotopes and halogens to investigate the role of fluids in the Earth's crust and mantle. His current projects are focused on testing the extent to which these elements are recycled from the atmosphere and ocean into the mantle by tectonic processes operating at convergent plate margins. However, using noble gases and halogens as fluid tracers to investigate the origin of fluids in economic mineral deposits including the role of abiogenic methane in gold deposits remains an area of special interest.