Are High Field Strength Element Anomalies a Good Proxy for Archaean Subduction?

George Guice, Mineralogist

January 30, 2020
Weekly Seminar Series
George Guice

George Guice is the Peter Buck Fellow at the Department of Mineral Sciences of the Smithsonian National Museum of Natural History.  He received his PhD from Cardiff University in 2019, and MSc in Mining Geology from Camborne School of Mines, University of Exeter.  His PhD thesis was titled "Origin and geodynamic significance of Archaean ultramafic-mafic complexes in the Kaapvaal and North Atlantic cratons." 

A Mineralogical Perspective on Biominerals in Changing Environments

Gabriela Farfan

January 23, 2020
Weekly Seminar Series
Gabriela Farfan

Gabriela Farfan, the Carolyn W. Whitney Curator of Gems and Minerals at the Mineral Sciences Division of the Smithsonian Institution's National Museum of Natural History, received her B.Sc. from Stanford University and her Ph.D. from MIT/Woods Hole Oceanographic Institution.  Farfan studies the crystal structures and chemistry of minerals formed under varying conditions in order to answer questions in Environmental Mineralogy, Biomineralization, and Gem Science.  Her current focus is on bio- and geo-formed carbonates (aragonite, calcite) and amorphous silica (opal, glass) [Info obtained from]

Using Jack Hills Zircons to Decode the Secular Evolution of the Early Earth

Research Geologist Michael Ackerson

January 16, 2020
Weekly Seminar Series
Michael Ackerson

Michael Ackerson, a former Carnegie Postdoctoral Fellow, is a Research Scientist at the Smithsonian's National Museum of Natural History.  He received his B.S. in Geological Sciences from Michigan State University and his Ph.D. in Geology from Rensselaer Polytechnic Institute.

Heavy Iron Isotope Composition of Iron Meteorites Caused by Core Crystallization

Carnegie Postdoctoral Fellow Peng Ni

January 9, 2020
Weekly Seminar Series
Peng Ni

Postdoctoral Fellow Peng Ni received his B.S. from Peking University and his Ph.D. in Geochemistry from the University of Michigan.  He is an experimental geochemist who seeks to understand the geochemical processes during planetary formation, differentiation, and evolution.  His current research program aims at understanding planetary formation and evolution by experimentally studying isotope fractionation of Cu and Fe during related processes.