Understanding the composition, structure and evolution of the Earth and the other terrestrial planets are dominant themes of my research. The differentiation of the Earth has created 3 highly stratified and distinct reservoirs (i.e., the core, the mantle-crust system, and the atmosphere-hydrosphere system). These reservoirs are in turn themselves internally differentiated. Chemical and isotopic studies of terrestrial and extra-terrestrial samples provide insights into the timing and details of the differentiation of these reservoirs. In addition to developing models for the compositions of the bulk Earth, core and silicate Earth, I use plasma mass spectrometry to analyze samples for their chemical and isotopic compositions. Data from these mass spectrometers are used to improve our understanding of the processes involved in differentiation and the timing of these events.
Opportunities For Undergraduates
Geology undergraduates and others with background in chemistry and/or physics are invited to participate in research with members of the Plasma Lab. Research opportunities include hands on experience in chemical and/or isotopic analyses and data processing. In addition, undergraduate geology majors can structure their GEOL 393/394 capstone project based on data gathered in the Plasma Lab. Interested students should contact Bill McDonough for further information.
Since coming to the University of Maryland in 2000 I, together with Claude Dalpe and Richard Ash, have built a state of the art mass spectrometry laboratory. This lab houses 2 inductively coupled plasma-mass spectrometers (ICP-MS) and 2 deep-UV laser ablation systems. Some of my research involves the development of instrumentation and applications. In our ICP-MS laboratory we have analyzed a wide range of materials for their chemical and isotopic compositions, including such diverse samples as:
airborne contaminants from a super-fund cleanup site.
archaeological artifacts and human remains.
biological tissues/fluids for trace metal levels.
experimental petrology run products.
desert varnish, invertebrates, etc. - environmental studies.
minerals (e.g., silicates, oxides, carbonates, phosphates, sulfides, metals).
novel thin film materials.
semi-conductor experimental products.
steels and other new metal compounds for material science.
water samples, including seawaters and fresh waters.
Teaching - Fall 2003
Honors 279W: The Solar System (Fall 2004)
Geol 100 (section 0102): Introduction to Physical Geology (Fall 2004)
Below are 2 other courses that I teach (generally in the Spring semester):
Geology 471/671: Geochemical Methods of Analysis(last taught Spring 2003)
Geology 489/689: Physics and Chemistry of Volcanoes (last taught Spring 2002)
Please follow the links for more details of our laboratory and other scientists in our group.