Earth's accretion and early differentiation as seen by noble gas isotopes.
with Dr. Rita Parai, Assistant Professor of Geochemistry, Washington University in St. Louis.
Abstract: Delivery and loss of volatile elements and compounds (such as water, carbon, nitrogen and the noble gases) during Earth’s accretion set the stage for the rest of our planet's history. Volatiles were gained through delivery by accreting solids and magma ocean ingassing during the lifetime of the solar nebula, and lost from the Earth system by impact-driven magma ocean outgassing and loss to space. Delivery and loss were each recorded by different noble gas isotope systems, making these sensitive tracers of important early-Earth processes. Here I present new insights into the mix of materials that delivered volatiles to the growing Earth, and the signatures of early differentiation that persist in the mantle today.
Host: Dr. Jennifer Middleton, Lamont Assistant Research Professor, Geochemistry
The Earth Science Colloquium Series, sponsored by Lamont-Doherty Earth Observatory and Columbia University Department of Earth and Environmental Sciences (DEES), provides a lively forum for discussing a wide variety of topics within the Earth sciences and related fields. Colloquia are attended by the full range of scientific and technical staff at LDEO. Colloquium attendance is required of all pre-orals DEES graduate students. The Colloquium Series supports the Lamont Seminar Diversity Initiative.