Chemical differentiation of the early Earth, dynamics of the Archean mantle, trace an isotope geochemistry, cosmochemistry, petrology.
Ph. D., "Magmas and Volcans" Laboratory, Universite Blaise Pascal, 2012
Hanika Rizo is currently a postdoctoral associate in Carnegie’s Department of Terrestrial Magnetism. She is interested in how planets formed and how they evolved through time. She works with the most ancient rocks preserved on the Earth’s surface to figure out the chemical structure and primordial evolution of the young Earth.
Using high-precision techniques to detect variations in chromium and tungsten isotopic compositions, both of which have contributions from even shorter-lived radioactive isotopes, she is trying to place constraints on the chemical evolution of Earth shortly following its formation. She works with rocks sampled in Southwest Greenland and in Northern Quebec. The results of her work support the hypothesis that between 100 to 200 million years after its formation, the Earth was made up of an ocean of molten rock (magma ocean), which gradually cooled. Preliminary results on the Greenland samples suggest that these rocks are capable of revealing important information about an intense meteoritic bombardment on Earth happening between 4.5 and 3.9 billion years ago.