Dr. Dawn Kellett
Research into geochronology and thermochronology of geological processes
Current research and/or projects
Kellett is research lead for the noble gas laboratory at the Geological Survey of Canada, which is used to date geological processes by measuring the natural radioactive decay of a potassium isotope to argon over geological time. She uses the laboratory's Nu Noblesse multicollector mass spectrometer, coupled to CO2 and UV lasers, as well as the other geochronology laboratories at the GSC to conduct geological research across Canada. Kellett particularly focuses on strategies for dating deformation and exhumation histories in ancient mountain belts. Research lines include:
Relationships between pluton emplacement, mineralization and deformation, Appalachian orogen
Methods for dating faults, fault reactivation and low-temperature deformation of rocks
Thermochronology as a tool to unravel post-accretionary tectonics, northern Canadian Cordillera
Professional activities / interests
Geochronology and thermochronology of geological processes
Structural and metamorphic petrology
Education and awards
Post-doctoral scholar, University of California, Santa Barbara, 2010-2011
Ph.D. Geology, Dalhousie University, 2010
M.Sc. Geology, Queen's University, 2006
B.Sc. (Comb. Hons.) Oceanography and Geology, University of British Columbia, 2003
International experience and/or work
Kellett has extensive experience working in the Himalayan orogen, and applies knowledge gained from that type example of a continent-continent collision to her research in Canadian collisional orogens.
Current international collaborations include:
-In situ Ar/Ar dating of shear zones, Open University, UK
-K-Ar dating of brittle fault gouge, Kyoto University, Japan
- Kellett, D.A., Weller, O., Zagorevski, A., and Regis, D., 2018. A petrochronological approach for the detrital record: Tracking mm-sized eclogite clasts in the northern Canadian Cordillera. Earth and Planetary Science Letters, 494, 23-31.
- Kellett, D.A., van Staal., C., Wilson, R.A., and Rogers, N., 2017. Salinic deformation constrained by 40Ar/39Ar dating of multiple cleavage domains: Bathurst Supergroup, New Brunswick Appalachians. American Journal of Science, doi: 10.2475/03.2017.02.
- Skipton, D., Schneider, D.A., Kellett, D.A., and Joyce, N., 2017. Deciphering the Paleoproterozoic cooling history of the northeastern Trans-Hudson Orogen, Baffin Island (Canada), using 40Ar/39Ar step-heating and UV laserprobe thermochronology. Lithos, 284-285, 69-90.
- Kellett, D.A., Warren, C., Larson, K.P., Zwingmann, H., van Staal, C.R., and Rogers, N., 2016. Influence of deformation and fluids on Ar retention in white mica: dating the Dover Fault, Newfoundland Appalachians. Lithos, doi:10.1016/j.lithos.2016.03.003.
- Cottle, J., Larson, K., and Kellett, D.A., 2015. How does the mid-crust accommodate deformation in large, hot collisional orogens? Insight from the Himalaya-Tibet system. Journal of Structural Geology, 78, 119-133. Invited review.