Megan Duncan

Research Interests

Mantle and core geochemistry/petrology

Planetary scale volatile cycling

Origins and formation of Earth and Mars, and other terrestrial bodies

Education

PhD Earth Science, Rice University – 2015

MS Earth and Planetary Sciences, University of New Mexico – 2010

BS Geology, Clemson University – 2007

Homepage

https://sites.google.com/vt.edu/petrology/

Publications

Muth, M., M. S. Duncan, R. Dasgupta. (accepted) Effect of variable Na/K ratio on CO₂ solubility in slab-derived rhyolitic melts. AGU Monograph - Carbon in Earth’s Interior

Duncan, M. S., N. C. Schmerr, C. M. Bertka, Y. Fei. (2018) Extending the solidus for a model ion-rich martian mantle composition to 25 GPa. Geophysical Research Letters, doi: 10.1029/2018GL078182

Garber, J. M., S. Maurya, J.-A. Hernandez, M. S. Duncan, L. Zeng, H. Zhang, U. Faul, C. A. McCammon, J.-P. Montagner, L. N. Moresi, B. A. Romanowicz, R. L. Rudnick, L. P. Stixrude. (2018) On the origin of high shear wave velocities in the deep roots of cratons. Geochemistry, Geophysics, Geosystems, 19: 2062–2086, doi: 10.1029/2018GC007534.

Duncan, M. S. and R. Dasgupta. (2017) Rise of Earth’s atmospheric oxygen controlled by efficient subduction of organic carbon. Nature Geoscience, doi: 10.1038/ngeo2939.

Duncan, M. S., R. Dasgupta, K. Tsuno. (2017) Experimental determination of CO₂ content at graphite saturation along a natural basalt-peridotite melt join: Implications for the fate of carbon in Terrestrial Magma Oceans. Earth and Planetary Science Letters, 466: 115–128, doi: 10.1016/j.epsl.2017.03.008.

Duncan, M. S. and R. Dasgupta. (2015) Pressure and temperature dependence of CO₂ solubility in hydrous rhyolitic melt – Implications for carbon transfer to mantle source of volcanic arcs via partial melt of subducting crustal lithologies. Contributions to Mineralogy and Petrology, 169:54, DOI 10.1007/s00410-015-1144-5.

Chi, H., R. Dasgupta, M. S. Duncan, N. Shimizu. (2014) Partitioning of carbon between Fe-rich alloy melt and silicate melt in a magma ocean – Implications for the abundance and origin of volatiles in Earth, Mars, and the Moon. Geochimica et Cosmochimica Acta, 139: 447–471.

Duncan, M. S. and R. Dasgupta. (2014) CO₂ solubility and speciation in rhyolitic sediment partial melts at 1.5-3.0 GPa – Implications for carbon flux in subduction zones. Geochimica et Cosmochimica Acta, 124: 328–347.

Duncan, M. S. and C. B. Agee. (2011) The partial molar volume of carbon dioxide in peridotite partial melt at high pressure. Earth and Planetary Science Letters, 312: 429–436.

van Kan Parker, M., C. B. Agee, M. S. Duncan, W. van Westrenen. (2011) Compressibility of molten Apollo 17 orange glass and implications for density crossovers in the lunar mantle. Geochimica et Cosmochimica Acta, 75: 1161–1172.