Faculty

Duncan Keller

Visiting Assistant Professor   

Email: dskeller@skidmore.edu
Phone: 518-580-5192
Office: Billie Tisch Center for Integrated Sciences 280C

Education:

• Ph.D. 2021, Earth and Planetary Sciences, Yale University
• MPhil. 2017, Geology and Geophysics, Yale University
• B.A, 2015, Geology, Colgate University

Courses:

• GE102 History of Earth and Life 
• GE204 Structural Geology 
• GE209 Earth Materials
• GE251-C Topics in Geophysics
• GE 351C Plate Tectonics 

Publications:

• Peterson, G.A. and Keller, D.S. Deep-Mantle Plume Properties Controlled by Spatial Relationships to LLSVPs. In revision at Geochemistry, Geophysics, Geosystems.   
• Keller, D.S. and Lee, C.-T.A. Testing the origins of massif-type anorthosites using paired Sr and Nd isotopic systematics. In review at Lithosphere.
• Lee, C.-T.A., Zhang, Y., Namur, O., Mou, J., Bakhshian, S., Keller, D.S., and Sun, C. Layered mafic intrusions, magmatic turbidites, and the making of platinum ores. In review at GSA Today.
• Zhang, J., Lee, C.-T.A., and Keller, D.S. (2026) Fractionation of Alkali Feldspar: On Making High Ga/Al Granite. International Geology Review, https://doi.org/10.1080/00206814.2026.2729580. 
• Lee, C.-T.A., Zhang, J., Keller, D.S., Zhang, Y., Ji, D., and Mou, J. (2026) Extreme magmatic differentiation and silicic magmatism without low melt fractions. Lithos, 536–537, 108581. https://doi.org/10.1016/j.lithos.2026.108581.
• Lee, C.-T.A., Keller, D.S., Dasgupta, R., Siebach, K., McGovern, P., Borchardt, J., and Zhang, J. (2025) Crustal thickness effects on chemical differentiation and hydrology on Mars. Earth and Planetary Science Letters, 651, 119155. https://doi.org/10.1016/j.epsl.2024.119155.
• Ague, J.J., Keller, D.S., Ackerson, M.R., and Holycross, M. (2024) Titanium Substitutions in Garnet at Magmatic, Granulite Facies, and High-Pressure Granulite Facies Conditions. American Mineralogist (early publication). https://doi.org/10.2138/am-2024-9442
• Keller, D.S., Lee, C.-T.A., Peck, W.H., Monteleone, B.D., Martin, C., Vervoort, J.D. and Bolge, L (2024). Mafic slab melt contributions to Proterozoic massif-type anorthosites. Science Advances, 10, eadn3976. https://doi.org/10.1126/sciadv.adn3976
• Tassara, S., Ague, J.J., Keller, D.S., Rooney, A.D., Wostbrock, J., Axler, J.A., and Tardani, D. (2024) Osmium and oxygen isotope constraints on magma-crust interactions and the transport of copper at the roots of arcs. Chemical Geology, 664, 122301. https://doi.org/10.1016/j.chemgeo.2024.122301
• Keller, D.S., Tassara, S., Robbins, L.J., Lee, C.-T.A., Ague, J.J. and Dasgupta, R. (2023) Links between large igneous province volcanism and subducted iron formations. Nature Geoscience, 16, 527– 533. https://www.nature.com/articles/s41561-023-01188-1 Keller, D.S. and Ague, J.J. (2022b) Predicting and explaining crystallographic orientation relationships of exsolution lamellae in garnet using the edge-to-edge matching model. Journal of Metamorphic Geology, 40, 1189–1218. https://onlinelibrary.wiley.com/doi/epdf/10.1111/jmg.12662
• Keller, D.S. and Ague, J.J. (2022a) Possibilities for misidentification of natural diamond and coesite in metamorphic rocks. Neues Jahrbuch für Mineralogie - Abhandlungen (Journal of Mineralogy and Geochemistry), 197, 3. https://doi.org/10.1127/njma/2021/0313
• Keller, D.S. and Ague, J.J. (2020) Quartz, mica, and amphibole exsolution from majoritic garnet reveals ultra-deep sediment subduction, Appalachian orogen. Science Advances, 6, 11, eaay5178. https://www.science.org/doi/10.1126/sciadv.aay5178
• Keller, D.S. and Ague, J.J. (2019) Crystallographic and textural evidence for solid-state precipitation of rutile, ilmenite, corundum, and apatite lamellae from garnet. American Mineralogist, 104, 980– 995.https://doi.org/10.2138/am-2019-6849
• Keller, D.S. and Ague, J.J. (2018) High-pressure granulite facies metamorphism (~1.8 GPa) revealed in silica-undersaturated garnet-spinel-corundum gneiss, Central Maine Terrane, Connecticut, U.S.A. American Mineralogist, 103, 1851–1868. https://doi.org/10.2138/am-2018-6543