|GE125||From Stardust to Planets||A|
|GE125 L||Lab: From Stardust to Planets||A|
|GE125 L||Lab: From Stardust to Planets||B|
|GE381||Planetary Surface Processes||A|
- Ph.D. in Geology - University of Tennessee, 2008
- M.S.in Geology - University of Tennessee, 2005
- B.S. in Geology - Tulane University, 2000
Areas of Expertise
- Solar system
Though most geologists study the Earth, my interests lie elsewhere. Growing up I was fascinated by the outer space. As an undergraduate student at Tulane University I discovered geology—the best discipline of all sciences! After working for a few years in environmental consulting, I returned to graduate school at the University of Tennessee. There I combined my interests in the solar system and geology to study planetary geology. My research focuses on the mineralogy and chemistry of primitive meteorites and asteroids. After graduating from the University of Tennessee, I worked as an assistant professor at Illinois State University for almost six years. I've been at Colby College since January of 2014. My biggest claim to fame is that I have an asteroid named after me. You can search for asteroid (8999) tashadunn on the Minor Planet Center website.
My research focuses on understanding the evolution of small planetary bodies, primarily primitive (unmelted) asteroids. Specifically, I study the thermal evolution of these objects to better understand the conditions under which our solar system formed. Because asteroids reside in outer space and cannot be directly sampled, they must be studied either by using remote sensing techniques (e.g., Earth-based telescopes or spacecraft instruments) or through laboratory analyses of meteorites (pieces of asteroids that have fallen to Earth). As a geologist, my passion lies in traditional laboratory analyses of planetary materials. However, as a planetary scientist, I am keenly aware of the critical role that remote sensing plays in solar-system research. Thus, I incorporate both methods into my research. I often combine the two approaches to make linkages between meteorites and their parent asteroids and to improve remote sensing techniques. Combining these techniques allows for better interpretation of asteroid surface compositions.
REFEREED JOURNAL ARTICLES (* undergraduate student advised by dunn)
Krot, A., Dunn T.L., Pataev M., Ma C., Nagashima K., Zipfel J. Metasomatic alteration of coarse-grained igneous calcium-aluminum-rich inclusions from CK3 carbonaceous chondrites. Submitted to Meteoritics and Planetary Science.
Rubin A., Dunn T.L., *Garner K., *Cecchi M., *Hernadez M. Barred olivine chondrules in ordinary chondrites: Constraints on chondrule-formation. Submitted to Meteoritics and Planetary Science.
Binzel, F.E., DeMeo F.E., Burt, B.J., Slivan S., Lantz C., Bus S.J., Tokunaga A., Burlan B., Carry B., Rivkin A.S., Burbine T.H.,
Polishook D., Moskovitz N., Thomas C.A., Dunn T.L., Vernazza P., Reddy V, Sanchez L., and Mainzer A. (2019) Compositional and source region distribution for the Near-Earth Object population: Results from the MIT-Hawaii Near-Earth Object spectroscopic survey (MITHNEOS). Icarus, 324, 41-76.
Heck, P.R. and 29 coauthors (2019) Best practices for the use of meteorite names in publications. Meteoriticsand Planetary Science, doi:10.1111/maps.13291.
Dunn T.L., *Battifarano, O.K., Gross J., and *O’Hara E.J. (2018) Characterization of matrix material in Northwest Africa5343: Weathering and thermal metamorphism of the least equilibrated CK Chondrite. Meteoritics and Planetary Science, 53, 2165-2180.
Dunn T.L. and Gross J. (2017) Reclassification of Hart and NWA 6047: Criteria for distinguishing between the CV and CK3chondrites. Meteoritics and Planetary Science, 52, 2412-2423.
Dunn T.L., Gross J., Ivanova M.A., *Runyon S.E, and *Bruck A.M. (2016) Magnetite in the unequilibrated CK Chondrites: Implications for metamorphism and new insights into the relationship between the CV and CK chondrites. Meteoritics and Planetary Science, 51, 1701-1720.
Lindsay S.S, T.L Dunn, J.P Emery, N.E. Bowles. (2016) The Red Edge Problem in asteroid band parameter analysis, Meteoritics and Planetary Science, 51, 806-817.
Bhatt, M., Reddy V., Le Corre, L., Sanchez, J.A., Dunn T.L., Li, J-Y., Becker, K. Weller, L. (2015) Spectral calibration for deriving surface mineralogy of asteroid (25143) Itokawa from Hayabusa NIRS spectrometer data, Icarus, 262, 124- 130.
Le Corre L., Reddy, V., Sanchez J.A., Dunn, T.L., Cloutis, E.A., Izawa, M., Mann, P., and Nathues. A. (2015) Exploring exogenic sources for the olivine on asteroid (4) Vesta. Icarus, 258, 483-499.
Dunn T.L., T.H. Burbine, W.F. Bottke, and *J.P. Clark (2013) Mineralogies and source regions of Near-Earth asteroids, Icarus, 222, 273-282.
Dunn T.L., G. Cressey, H.Y. McSween Jr., T.J. McCoy, and P.A. Bland (2010), Analysis of ordinary chondrites using position sensitive X-Ray diffraction: 1. Modal mineral abundances, Meteoritics and Planetary Science, 45, 123-134.
Dunn T.L., H.Y. McSween Jr., T.J. McCoy, and G. Cressey (2010), Analysis of ordinary chondrites using position sensitive X-Ray diffraction: 2. Applications to parent body processes, Meteoritics and Planetary Science, 45, 135-156.
Dunn T.L., T.J. McCoy, J.M. Sunshine, H.Y McSween Jr. (2010) A Coordinated Spectral, Mineralogical, and Compositional Study of Ordinary Chondrites, Icarus, 208, 789-797.
Dunn T. L., H. Y. McSween Jr., and P. R. Christensen (2007), Thermal emission spectra of terrestrial alkaline volcanic rocks: Applications to Martian remote sensing, Journal of Geophysical Research, 112, E05001, doi:10.1029/2006JE002766.