Department of Earth, Environmental & Planetary Sciences

This new work combines experimental petrology and modeling to understand the conditions of sedimentary diapir formation occurring in subduction zones. Led by collaborators at University of Arizona along with DEEPS Assistant Professor Emily Cooperdock, the authors find that subducted sediments are unlikely to form diapirs except in warm, slow subducting systems. Sedimentary diapirs may contribute to arc magmatic geochemical signatures under these specific conditions.

A new publication in G3 led by Assistant Professor Emily H. G. Cooperdock untangles the systematics of uranium enrichment for serpentinites from different tectonic settings and explores potential mineral hosts. The researchers found that "uranium enrichment is most common in the upper 100m of the seafloor and is not correlated with degree of serpentinization. We also find a correlation between U concentration and iron-oxidation, which we use to suggest that U is hosted in ferric iron minerals, possibly iron-oxides." The paper also provides insights on using uranium as a tracer for tectonic setting, fluid rock interactions, and redox records in the solid Earth system.

For her recent UTRA project, Ava Ward '25 tackled the organization and stewardship of the department's field and camping supplies to help DEEPS students gear up for safer, more sustainable adventures.

This summer, DEEPS Assistant Professor Emily H. G. Cooperdock, graduate student Anahi Carrera, and Columbia University Professor Steven L. Goldstein visited the island of Unalaska to collect samples that will help interpret data from a 2015 NSF GeoPRISMS campaign, as well as pave the way for future research.

Assistant Professor Emily Cooperdock and colleagues have published new research on uranium isotopes in serpentinite rocks found both underwater and on land. The team discovered that the uranium isotope ratios in submarine serpentinites are influenced by seafloor weathering and differ from seawater ratios. Overall, the results show exciting evidence that U-isotopes can be used to measure recent weathering of ultramafic serpentinites. The findings also caution against using these systems as indicators of ancient geological events.