Dr. Jacob Forshaw
Metamorphism of pelites, with an emphasis on the Whetstone Lake area, Ontario
Jacob studied the thermodynamic modelling of mafic granulites for his MSc degree at Oxford, which formed the basis for his first publication. At Calgary, he examined the metamorphism of the broadly pelitic rocks (metamorphosed clastic sediments and metamorphosed altered volcanics) of the Barrovian (Grt-St-Ky-Sil) Whetstone Lake area, Ontario, made famous by a series of papers by Dugald Carmichael in the 1970s. Jacob documented the extraordinary range of bulk compositions and mineral assemblages of these rocks, and used these to test the ability of thermodynamic models to predict the phase relations. To put these rocks in context, and to aid in the modelling, he first did global assessments of the bulk composition of pelitic rocks, and of Fe2+/Fe3+ in minerals in pelitic rocks.
Selected publications:
Forshaw, J.B. & Pattison, D.R.M. (2023) Bulk Compositional Influence on Diverse Metapelitic Mineral Assemblages in the Whetstone Lake Area, Ontario. Journal of Petrology 64, 1-29. pdf https://doi.org/10.1093/petrology/egad071
Forshaw, J.B. & Pattison, D.R.M. (2023) Major-element geochemistry of pelites. Geology 51, 39-43. pdf
Forshaw, J.B. & Pattison, D.R.M. (2022) Major element geochemistry of pelites. British Metamorphic Studies Group - Research in progress meeting. St. Andrews, UK, April 17, 2022.
Gopon, P., Forshaw, J.B., Waters, D.J., Wade, J. (2022) Seeing through metamorphic overprints in the Lewisian Complex of Scotland using two-pyroxene single crystal thermometry. American Mineralogist. doi: https://doi.org/10.2138/am-2022-8214CCBY
Forshaw, J.B. & Pattison, D.R.M. (2021) Ferrous/Ferric (Fe2+/Fe3+) partitioning among silicates in metasedimentary rocks. Contributions to Mineralogy and Petrology 176. 26 pages. doi.org/10.1007/s00410-021-01814-4. pdf
Pattison, D.R.M., Forshaw, J.B., Lanari, P., Caddick, M.J., Waters, D.J. & Tinkham, D.K. (2021). Phase equilibrium modelling: approaches and pitfalls. Report on the on-line meeting. Elements 11(3): 216-217. pdf link to workshop website and presentations
George F.R., Waters D.J., Gough S., Searle M.P., and Forshaw, J.B., 2021, Phase equilibria and microstructural constraints on the high temperature building of the Kohistan island arc: the Jijal garnet granulites, northern Pakistan. Journal of Metamorphic Geology. https://doi.org/10.1111/jmg.12622
Ambrose, T.K, Waters, D.J., Searle, M.P., Gopon, P., and Forshaw, J.B., 2021, Burial, accretion and exhumation of the Oman-UAE metamorphic sole. Tectonics, 40(4). https://doi.org/10.1029/2020TC006392
Forshaw, J.B. & Pattison, D.R.M. (2020) Barrovian-type metamorphism in the Whetstone Lake region, SE Ontario: bulk compositional control on pelitic mineral assemblages. Geological Society of America annual meeting, Montreal (virtual meeting due to COVID), Oct. 28, 2020.
Forshaw, J.B., Waters, D.J., Pattison, D.R.M., Palin, R.M. & Gopon, P. (2019) A comparison of observed and thermodynamically predicted phase equilibria and mineral compositions in mafic granulites. Journal of Metamorphic Geology 37, 153-179. pdf
Forshaw, J.B. & Pattison, D.R.M. (2019) Kinetic influence on prograde regional metamorphism of pelites. Geological Society of America annual meeting. Phoenix, AZ, Sep 25, 2019.
Forshaw, J.B. & Pattison, D.R.M. (2019) Assessing the interplay between equilibrium and kinetics in regional metamorphism. Geological Association of Canada-Mineralogical Association of Canada Joint Annual Meeting, Quebec, QC, May 14, 2019.
Forshaw, J.B., Waters, D.W., Pattison, D.R.M., Palin, R.M. & Gopon, P (2018) Thermodynamic modelling of mafic granulites: discrepancies between observed and predicted phase equilibria. Geological Society of America annual meeting. Indianapolis, IN, Nov. 6, 2018.