People

Julisan Street, PhD student

Julisan will start her PhD in Fall of 2021. She finished her undergraduate major in Geology and minor in Anthropology & Sociology at Lafayette College, where she worked on a senior thesis studying the origin of Jamaican adakite volcanism as a possible analog for Archean magmatic process. At UM, Julisan will be researching the causes of (ultra)high-temperature metamorphism and crustal melting in southern Madagascar and the southwest USA.

 

Yiruo Xu, PhD student

Yiruo will start her PhD in Fall 2021. She completed her undergraduate degree in Geology and Economics at Vanderbilt University, where she worked on a senior thesis evaluating the source of Paleozoic volcanic ashes (K-bentonites) in the eastern USA and using Ce anomalies in zircon to estimate the oxygen fugacity of their magmas prior to eruption. At UM, Yiruo will be researching the timescales and drivers of Archean metamorphism and magmatism in the Superior Province of the USA and Canada.

 

David Hernández-Uribe, Postdoc

David started at the University of Michigan in September 2020 after completing his PhD at the Colorado School of Mines, his MS at Central Washington University, and his BS at la Universidad Nacional Autónoma de México, Mexico City. He is broadly interested in subduction zone processes. His previous projects have focused on the formation and exhumation of ultrahigh-pressure metamorphic rocks, flat-slab subduction in SW USA, volatile cycling between the crust and mantle, and the scenarios that lead to slab melting. He has worked with rocks from China, Mexico, USA, and Guatemala in addition to theoretical modeling of metamorphic phase equilibria in subducting slabs. In addition to his expertise in petrology, David also has experience with LA-ICP-MS U–Pb geochronology and Lu-Hf garnet geochronology. As a postdoc at UM, he is studying the tectonic significance of Mesozoic subduction complexes in Baja California.

 

Robert M. Holder, Assistant Professor

Robert started at the University of Michigan in July 2020 after finishing a postdoc at Johns Hopkins University with Daniel Viete, MS+PhD at UC Santa Barbara with Brad Hacker, and BA at Gustavus Adolphus College (Geology & Scandinavian Studies). He is interested in the evolution of ancient mountain belts and how Earth’s fundamental tectonic processes have changed through time. His work has primarily focused on the metamorphic rock record (specifically ultrahigh-temperature and ultrahigh-pressure metamorphism), but also touches on igneous, and sedimentary processes. He uses a variety of laboratory techniques, but is most known for his application of U–Pb petrochronology by LA-ICP-MS. He has previously worked in the USA, Canada, Norway, Czech Republic, Austria, Scotland, Madagascar, and Antarctica.