Sheila Seaman

Associate Professor of Geology
Igneous Petrology

Ph.D., University of New Mexico, 1988

M.S., University of Arizona, 1983

B.A. Bryn Mawr College, 1979

Department of Geosciences
611 North Pleasant Street
University of Massachusetts
Amherst, Massachusetts 01003

Phone: 413 545-2822
Fax: 413 545-1200
sjs@geo.umass.edu

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My research and teaching interests include the genesis and evolution of magmas, the role of water in magmas, the building of continental crust, and explosive silicic volcanism, with a focus on coastal Maine , the Southwestern US , and Iceland

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Current Research Projects:

Water in Feldspar Minerals and in Glasses
Proterozoic Igneous Rocks of the Grand Canyon
Behavior of Mingled Magmas during Explosive Eruptions
Middle Tertiary Explosive Volcanism in the Southwestern US

Courses Taught:

Geosciences 285 Environmental Geology
Geosciences 311 Mineralogy (fall semesters)
Geosciences 321 Petrology (spring semesters, rotating with Mike Rhodes)
Geosciences 513 Crystal Chemistry
Geosciences 591G Granites and Rhyolites
Geosciences 697O Optical Mineralogy
Geosciences 723 Igneous Petrology
Geosciences 821 Petrology Seminar

Representative Publications:

Seaman, S.J., Dyar, M.D., and Marinkovic, N., 2006, An FTIR study of hydrogen in anorthoclase and associated melt inclusions, American Mineralogist, 12-21.

Karlstrom, K.E., Ilg, B.R., Williams, M.L., Hawkins, D.P., Bowring, S., Seaman, S.J., 2003, Paleoproterozoic rocks of the Granite Gorges, In Beus, S.S. and Morales, M., Eds., Grand Canyon Geology: New York , Oxford University Press.

Seaman, S.J., 2000, Crystal clusters, feldspar glomerocrysts, and magma envelopes in the Atascosa Lookout lava flow, southern Arizona , USA : recorders of magmatic events. Journal of Petrology, v. 41, 693-716.

Seaman, S.J., Scherer, E.E., Wobus, R.A., Zimmer, J.E., and Sales, J.G., 1999, Effusive and explosive volcanism in the Cranberry Island series, coastal Maine . Geological Society of America Bulletin, v. 111, 686-708

Seaman, S.J., Scherer, E.E., and Standish, J.J.,1995, Multi-stage magma mixing and mingling and the origin of flow banding in the Aliso Lava Dome, Tumacacori Mountains, southern Arizona. Journal of Geophysical Research, 100, 8381-8398.

Seaman, S.J., Wobus, R.A., Wiebe, R.A., Bowring, S.A., and Lubick, N.,1995, Volcanic expression of complex bimodal magmatism: The Cranberry Island-Cadillac Mountain Complex, coastal Maine, Journal of Geology, 103, 301-311.

Seaman, S.J. and Williams, M.L., 1995, The Crooks Canyon intrusive complex: bimodal magmatism in a Proterozoic island arc, central Arizona, In Brown, M. and Piccoli, P., eds., The Origin of Granites and Related Rocks, U.S. Geologic Survey Circular 1129, 137-138.

Seaman, S.J., and Ramsey,P.C. (1992) Effects of magma mingling in the granites of Mount Desert Island, Maine. Journal of Geology, 100, 395-409.

Seaman, S.J., and Williams, M.L. (1992) Center-to-center analysis and flow fabric characterization in ash-flow tuffs. Bulletin of Volcanology, 54, 319-328.

Seaman, S.J., McIntosh, W.C., Geissman, J.W., Williams, M.L., and Elston, W.E. (1991) Magnetic fabrics of the Bloodgood Canyon and Shelley Peak Tuffs, southwestern New Mexico: Implications for emplacement and alternation processes. Bulletin of Volcanology, 53, 460-476.

In Review:

Seaman, S.J., Dyar, M.D., and Marinkovic, N., The effects of water concentration variation on the development of flow banding and spherulties in rhyolitic lava, Bulletin of Volcanology.

Gylling, H., Seaman, S.J., Karner, F., Development of concentric zoning in the Tunk Lake pluton, Maine : The controlling effects of gradients in water concentration, temperature, and contaminant proximity, Geological Society of America Bulletin.

Last revised 15 November, 2006--

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