Research areas
I obtained a Diplom (M.Sc. equivalent) in Geology from the University of Mainz in Germany, and a PhD from the University of St Andrews. I am now managing the geochemistry facilities at the School of Earth and Environmental Sciences. Although analytical work and quantitative data are crucial for any science, I believe that field work is indespensable and the foundation for Earth Science research. It allows us to put our petrological/geochemical measurements and findings into a geological context, and only then can we use them to understand how "Earth works". Currently, my particular interest is in early Earth geology. I use and test the tools of a petrologist to contribute to our understanding of the evolution of Earth's crust (e.g. crustal growth and reworking) and secular changes in Earth history (e.g. when did plate tectonics start?).
Selected publications
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Zircon geochronology reveals polyphase magmatism and crustal anatexis in the Buchan Block, NE Scotland: implications for the Grampian Orogeny
Johnson, T. E., Kirkland, C. L., Viete, D. R., Fischer, S., Reddy, S. M., Evans, N. J. & McDonald, B. J., Nov 2017, In : Geoscience Frontiers. 8, 6, p. 1469-1478Research output: Contribution to journal ? Article
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Mechanisms of deformation-induced trace element migration in zircon resolved by atom probe and correlative microscopy
Reddy, S. M., Riessen, A. V., Saxey, D. W., Johnson, T. E., Rickard, W. D. A., Fougerouse, D., Fischer, S., Prosa, T. J., Rice, K. P., Reinhard, D. A., Chen, Y. & Olson, D., 15 Dec 2016, In : Geochimica et Cosmochimica Acta. 195, p. 158-170 13 p.Research output: Contribution to journal ? Article
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Grampian migmatites in the Buchan Block, NE Scotland
Johnson, T. E., Kirkland, C. L., Reddy, S. M. & Fischer, S., Sep 2015, In : Journal of Metamorphic Geology. 33, 7, p. 695-709 15 p.Research output: Contribution to journal ? Article
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Precambrian reidite discovered in shocked zircon from the Stac Fada impactite, Scotland
Reddy, S. M., Johnson, T. E., Fischer, S., Rickard, W. D. A. & Taylor, R. J. M., 1 Jan 2015, In : Geology. 43, 10, p. 899-902 4 p.Research output: Contribution to journal ? Article
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Field and petrographic evidence for partial melting of TTG gneisses from the central region of the mainland Lewisian complex, NW Scotland
Johnson, T. E., Fischer, S. & White, R. W., 1 Mar 2013, In : Journal of the Geological Society. 170, 2, p. 319-326 8 p.Research output: Contribution to journal ? Article
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Archaean intracrustal differentiation from partial melting of metagabbro-field and geochemical evidence from the central region of the Lewisian complex, NW Scotland
Johnson, T. E., Fischer, S., White, R. W., Brown, M. & Rollinson, H. R., 1 Oct 2012, In : Journal of Petrology. 53, 10, p. 2115-2138 24 p., egs046.Research output: Contribution to journal ? Article