Adjunct Professor of GeologySandy Underwood


Office: TRAP #110



Curriculum Vitae

Research Interests

My research interests include low grade metamorphic processes with particular emphasis on Proterozoic sedimentary basins and the minerals that develop in basin hydrothermal systems. Volcanic systems that result from tectonism. Geochemistry utilizing stable isotopes to identify fluid reservoirs.

Courses Taught

GEO 449 - Metamorphic Petrology

GEO 450 - Igneous Petrology


B.S., Chemical Engineering, University of Wyoming, 1978
Ph.D. Chemical Engineering, University of California, Berkeley 1987
Ph.D. Earth Sciences , Montana State University, 2009

Selected Publications

Underwood, S.J., Clynne, M.A. Oxygen isotope geochemistry of mafic phenocrysts in
primitive mafic lavas from the southernmost Cascade Range, California. American
Mineralogist, (In a special collection:
Geochemistry, Geology and Geobiology of Lassen Volcanic National Park).

Underwood, S.J., Childs, J.F., Walby, C.P., Lynn, H.B., Wall, Z.S., Cerino, M.T., and Bartlett,
E., 2014, The Yellowstone and Regal talc mines and their geologic setting in
southwestern Montana, in Shaw, C.A., and Tikoff, B., eds., Exploring the Northern Rocky
Mountains: Geological Society of America Field Guide 37, p. 161–187,

Underwood, S.J., Feeley, T.C., Clynne, M.A. Hydrogen isotope investigation of amphibole
and glass in dacite magmas erupted in 1980–1986 and 2005 at Mount St. Helens,
Washington. Journal of Petrology. doi:10.1093/petrology/egt005.

Underwood, S.J., Feeley, T.C., Clynne, M.A. Hydrogen isotope investigation of amphibole
and biotite phenocrysts in silicic magmas erupted at Lassen Volcanic Center, California.
Journal of Volcanology and Geothermal Research. doi:10.1016/j.jvolgeores.2012.02.019.

Feeley, T.C., Wilson, L.F., Underwood, S.J. (2008) Distribution and compositions of
magmatic inclusions in the Mount Helen dome, Lassen Volcanic Center, California:
Insights into magma chamber processes. Lithos, doi:10.1016/j.lithos.2008.07.010