Dr Mel Murphy
My research focuses on examining the interplay between terrestrial weathering processes and (i) ocean oxygenation and redox chemistry (ii) atmospheric CO2, and ultimately (iii) the Earth’s climate system over modern and geological timescales. In particular, I am interested in silicate, carbonate and sulfide mineral weathering at high-latitude glaciated and permafrost-dominated Arctic regions.
To do this, I apply non-traditional isotopic, elemental and mineralogical tools to better understand geochemical cycling in riverine/estuarine and marine environments
As a geologist and earth scientist, my research uses isotopic and geochemical measurements to investigate past changes in ocean chemistry, ocean circulation, continental weathering, and polar ice sheets, and how these interacted with Earth’s climate evolution. Evidence from such paleoclimate studies provides an invaluable context for understanding the present and future climate system
Paleoceanographic context of organic matter deposition on the Yangtze Craton, South China during the Ediacaran Period
Elucidating mineral dissolution and precipitation mechanisms.
My thesis will focus on the mechanisms by which minerals dissolve and precipitate as a function of the system’s distance from equilibrium. To formulate a general law by which dissolution and precipitation reaction mechanisms and rates behave at near to equilibrium conditions, two completely different minerals will be precipitated and dissolved in the lab: sepiolite, a Mg-silicate, and siderite, an Fe-carbonate.
“Enhanced weathering CO2 sequestration experiments at 4°C”