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Department of Earth Sciences

Metamorphic petrology


2006–2010: BA/MSci in Natural Sciences, Pembroke College, University of Cambridge, UK. Worked with Frederik Tilmann and Dietrich Lange to illuminate a new strike-slip duplex along the Great Sumatran Fault using relocated crustal seismicity (Weller et al., 2012).

2010–2014: DPhil in Earth Science, Exeter College, University of Oxford, UK. Worked with Mike Searle, Dave Waters and Marc St-Onge to probe the crustal evolution of the Tibetan plateau using various tectonic windows into the mid-crust (Weller et al., 2013, 2015a, 2016a, 2016b).

2014: Japan Society for the Promotion of Science (JSPS) Postdoctoral Fellow, Nagoya University, Japan. Worked with Simon Wallis to rationalise the distribution of glaucophane- and barroisite-bearing lithologies within the Sanbagawa metamorphic belt (Weller et al., 2015b).

2015–2016: Natural Sciences and Engineering Research Council of Canada (NSERC) Visiting Fellow, Geological Survey of Canada, Canada. Worked with Marc St-Onge on the Quebec–Baffin portion of the Himalayan-scale Paleoproterozoic Trans-Hudson orogen (Weller et al., 2015c; Weller & St-Onge, 2017; St-Onge et al., 2020; Weller et al., 2020).

2017-present: Lecturer in the Earth Sciences department at the University of Cambridge. I teach the second- and third-year metamorphic petrology courses, and lead the second-year field trip to Cornwall.


I am broadly interested in the timescales, controls and consequences of metamorphic processes within the lithosphere, and how these processes have changed over geological time. I examine these topics by integrating field and petrographic observations with phase equilibria modelling, thermal modelling, high-temperature geochronology and trace element geochemistry to decode the tectonothermal history of high-grade terranes. Presently, I am leading a variety of projects within three major research themes:

1. Formation of Archean granite-greenstone belt terranes. In collaboration with the Geological Survey of Canada, I am taking part in a geological study of North Baffin Island in the Canadian Arctic (e.g. Skipton et al., 2017; Saumur et al., 2018). This region is of scientific and economic interest as it exposes a classic Archean granite-greenstone belt terrane, with one of the belts host to the world-class Mary River iron deposit. Nevertheless, fundamental questions remain concerning the extent, geometry, age and origin of the belts. These questions will be resolved through targeted mapping, U-Pb geochronology and phase equilibria modelling using newly developed thermodynamic models appropriate for the melting of metabasic lithologies. The results will shed light on the nature of early Earth tectonics. For more information, see this blog post.

2. Secular change in tectonometamorphic processes. Tectonic regimes on Earth have undergone a secular change in style with an early non-plate tectonic regime giving way to more uniformitarian plate tectonic processes featuring subduction, largely owing to planetary cooling and the resultant effects on lithospheric thickness and strength. However, the timing, details and drivers of these changes are debated. I am investigating the metamorphic implications of the associated bulk chemical variations through time on plate dynamics using integrated phase equilibria and thermal modelling (e.g., Weller et al., 2019). These studies will further our understanding of the evolution of plate tectonics.

3. Timescales and thermal evolution of regional metamorphism. Analytical advances in dating accessory phases are allowing for greater insights into the rates of metamorphism. I am exploring how laser ablation raster mapping of monazite grains can provide further constraints on the timing of monazite growth (e.g., Weller et al., 2020). I am also collaborating with Alex Copley on the thermal evolution of mountain ranges.

I have ongoing collaborations with researchers from the University of Oxford and the Geological Survey of Canada. I also greatly enjoy doing scientific outreach, and have been a guest on a Naked Scientist podcast and have written blogs for the UK in Canada Arctic partnership.


Key publications: 

Weller, O.M., Jackson, S., Miller, W.G.R., St-Onge, M.R., and Rayner, N. (2020) Quantitative elemental mapping of granulite-facies monazite: textural insights and implications for petrochronology. Journal of Metamorphic Geology, doi: 10.1111/jmg.12552

St-Onge, M.R., Scott, D.J., Rayner, N., Sanborn-Barrie, M., Skipton, D.R., Saumur, B.M., Wodicka, N. and Weller, O.M. (2020). Archean and Paleoproterozoic cratonic rocks of Baffin Island; in Dafoe, L. and Bingham-Koslowski, N (eds), Geological Synthesis of Baffin Island (Nunavut) and the Labrador-Baffin Seaway, Geological Survey of Canada, Bulletin 608, p. 1–29, doi: 10.4095/321824

Weller, O.M., Copley, A., Miller, W.G.R., Palin, R.M., and Dyck, B. (2019) The relationship between mantle potential temperature and oceanic lithosphere buoyancy.  Earth and Planetary Science Letters 518, 86–99, doi: 10.1016/j.epsl.2019.05.005

Kellett, D.A., Weller, O.M., 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, doi: 10.1016/j.epsl.2018.04.036

Saumur, B.M., Skipton, D.R., St-Onge, M.R., Bros, E.R., Acosta-Gongora, P., Kelly, C.J., Morin, A., O’Brien, M.E., Johnston, S.T. and Weller, O.M. (2018) Precambrian geology of the surroundings of Steensby Inlet and western Barnes Ice Cap (parts of NTS 37E, 37F, 37G), Baffin Island, Nunavut. Summary of Activities 2018, Canada-Nunavut Geoscience Office, p. 29–46.

Weller, O.M., and St-Onge, M.R. (2017) Record of modern-style plate tectonics in the Palaeoproterozoic Trans-Hudson orogen. Nature Geoscience 10, 305–311 doi: 10.1038/ngeo2904

Palin, R.M., Reuber, G.S., White, R.W., Kaus, B.J.P., and Weller, O.M. (2017) Subduction metamorphism in the Himalayan ultrahigh-pressure Tso Morari massif: An integrated geodynamic and petrological modelling approach. Earth and Planetary Science Letters 467, 108–119, doi: 10.1016/j.epsl.2017.03.029

Skipton, D.R., Saumur, B.M., St-Onge, M.R., Wodicka, N., Bros, E.R., Morin, A., Brouillette, P., Weller, O.M., and Johnston, S.T. (2017) Precambrian bedrock geology of the Pont Inlet–Mary River area, northern Baffin Island, Nunavut. Summary of Activities 2017, Canada-Nunavut Geoscience Office, p. 49–68.

Weller, O.M., St-Onge, M.R., Rayner, N., Waters, D.J., Searle, M.P., and Palin, R.M. (2016b) U-Pb zircon geochronology and phase equilibria modeling of the Sumdo eclogite, south-east Tibet: insights into metamorphic zircon crystallisation and eclogite exhumation. Lithos 262, 729–741, doi: 10.1016/j.lithos.2016.06.005

Palin, R.M., Weller, O.M., Waters, D.J., and Dyck, B.J. (2016) Quantifying geological uncertainty in metamorphic phase equilibria modeling; a Monte Carlo assessment and implications for tectonic interpretations. Geoscience Frontiers 7, 591–607, doi: 10.1016/j.gsf.2015.08.005

Weller, O.M., St-Onge, M.R., Rayner, N., Searle, M.P., and Waters, D.J. (2016a) Miocene magmatism in the Western Nyainqentanglha mountains of southern Tibet: an exhumed bright spot? Lithos 245, 147–160, doi: 10.1016/j.lithos.2015.06.024

Weller, O.M., Dyck, B.J., St-Onge, M.R., Rayner, N., and Tschirhart, V. (2015c) Completing the bedrock mapping of southern Baffin Island, Nunavut: plutonic suites and regional stratigraphy. Summary of Activities 2015, Canada-Nunavut Geoscience Office, p. 33–48.

Weller, O.M., Wallis, S.R., Aoya, M., and Nagaya, T. (2015b) Phase equilibria modelling of blueschist and eclogite from the Sanbagawa metamorphic belt of south-west Japan reveals along-strike consistency in tectonothermal architecture. Journal of Metamorphic Geology 33, 579–596, doi: 10.1111/jmg.12134

Weller, O.M., St-Onge, M.R., Searle, M.P., Waters, D.J., Rayner, N., Chung, S.L., Palin, R.M., and Chen, S. (2015a) Quantifying the PTt conditions of north-south Lhasa terrane accretion: new insight into the pre-Himalayan architecture of the Tibetan plateau. Journal of Metamorphic Geology 33, 91–113, doi: 10.1111/jmg.12112

Weller, O.M., St-Onge, M.R., Searle, M.P., Rayner, N., Waters, D.J., Chung, S.L., Palin, R.M., Lee, Y.H., and Xu, X.W. (2013) Quantifying Barrovian metamorphism in the Danba Structural Culmination of eastern Tibet. Journal of Metamorphic Geology 31, 909–935, doi: 10.1111/jmg.12050

Weller, O.M. Lange, D., Tilmann, F., Natawidjaja, D., Rietbrock, A., Collings, R., and Gregory, L. (2012) The structure of the Sumatran Fault revealed by local seismicity. Geophysical Research Letters 39, 1–7, doi: 10.1029/2011GL050440

Teaching and Supervisions

Research supervision: 

Working with:

  • PhD student Andrew Whyte to investigate the formation and destruction of ancient gneissic terranes.
  • PhD student Ian Cawood (University of Oxford) to decode the metamorphic evolution of the Greater Himalayan Series in Zanskar, India.
  • PhD student Sophie Miocevich to interpret rare supracrustal assemblages in the Lewisian Complex of north-west Scotland.
Fellow and Director of Studies, Sidney Sussex College
Dr Owen  Weller

Contact Details

Email address: 
Office S203, Department of Earth Sciences, Downing St, Cambridge, CB2 3EQ, UK
Twitter: @owenmweller
+44 (0) 1223 333464
Takes PhD students