Institut für Geowissenschaften - Geophysik

Dr. Tim Johnson


Born in Kent, England, Tim studied Geology at the Universities of Derby

and Cambridge. He obtained his Ph.D. in 1999 for a project on migmatitic gneisses

from the NE Dalradian of Scotland. A two year postdoctoral position at the

University of Graz, Austria, (2000-2002) was followed by a further year of

postdoctoral research (2003) with Mike Brown at the University of Maryland, USA. Tim

then spent 3 years investigating fermented aqueous-CO 2 fluids when running

his own pub in Graz, before moving to Mainz in September 2007.





Tim's main research interests include the use of internally consistent thermodynamic databases in the investigation of high-temperature subsolidus and suprasolidus phase equilibria and related metamorphic processes. He is particularly interested in the generation, segregation and emplacement of granitic melt and the consequences for crustal evolution. He has worked on regional and contact metamorphic rocks from Scotland, Brittany, Maine, Ethiopia and South Africa. Current field areas of interest include the aureole of the Bushveld Complex, South Africa, and regional metamorphic rocks of the Ivrea Zone, Italy.





Johnson.T.E, White, R.W. & Brown, M., 2011. A year in the life of an aluminous metapelite xenolith - role of heating rates, reaction overstep, H2O retention and melt loss. Lithos, 124, 132-143


Johnson T.E., & White, R.W., 2011. Phase equilibrium constraints on conditions of granulite facies metamorphism at Scourie, NW Scotland. Journal of the Geological Society London, 168, 147-158


Johnson T.E., Brown, M. & White, R.W., (2010). Petrogenetic modelling of strongly residual metapelitic xenoliths within the southern Platreef, Bushveld Complex, South Africa. Journal of Metamorphic Geology, 26, 269-291


Johnson T.E., White, R.W. & Powell, R., (2008). Partial melting of metagreywackes: a calculated mineral equilibria study. Journal of Metamorphic Geology, 26, 837-853


Johnson, T., Brown, M., Gibson, R. and Wing, B. (2004). Spinel-cordierite symplectites replacing andalusite: evidence for melt-assisted diapirism in the Bushveld Complex, South Africa. Journal of Metamorphic Geology, 22, 529-545.


Johnson, T. E. and Brown, M. (2004). Quantitative constraints on metamorphism in the Variscides of Southern Brittany - a complementary pseudosection approach. Journal of Petrology, 45, 1237-1259.


Johnson, T. and Brown, M. (2004). The granulite facies, crustal melting, and prograde and retrograde phase equilibria in metapelites at the amphibolite to granulite facies transition. In: Thomas, H. (ed.) Granulite Facies Metamorphism and Crustal Evolution. Geological Society of India, Bangalore.


Johnson, T. E., Hudson, N. F. C. and Droop, G. T. R. (2003). Evidence for a genetic granite-migmatite link in the Dalradian of NE Scotland. Journal of the Geological Society, London, 160, 447-457.


Johnson, T. E., Brown, M. and Solar, G. S. (2003). Low-pressure subsolidus and suprasolidus phase equilibria in the MnNCKFMASH system: Constraints on conditions of regional metamorphism in western Maine, northern Appalachians. American Mineralogist, 88, 624-638.


Johnson, T. E., Gibson, R. L., Brown, M., Buick, I. S. and Cartwright, I. (2003). Partial melting of metapelitic rocks beneath the Bushveld Complex, South Africa. Journal of Petrology, 44, 789-813.


Johnson, T. E., Hudson, N. F. C. and Droop, G. T. R. (2001). Melt segregation structures within the Inzie Head gneisses of the northeastern Dalradian. Scottish Journal of Geology, 37, 59-72.


Johnson, T. E., Hudson, N. F. C. and Droop, G. T. R. (2001). Partial melting in the Inzie Head gneisses: the role of water and a petrogenetic grid in KFMASH applicable to anatectic migmatites. Journal of Metamorphic Geology, 19, 99-118.


Johnson, T. E., Hudson, N. F. C. and Droop, G. T. R. (2000). Wollastonite-bearing assemblages from the Dalradian at Fraserburgh, northeast Scotland and their bearing on the emplacement of garnetiferous granitoid sheets. Mineralogical Magazine, 64, 1165-1176.



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