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significant crustal contributions (Hollister and Andronicos, 2006). Crawford, M.L., Hollister, L.S., and Woodsworth, G.J., 1987, Crustal
Additional petrologic and geochronologic research is required to deformation and regional metamorphism across a terrane boundary, Coast
better evaluate the proportion of mantle and crustal contributions Plutonic Complex, British Columbia: Tectonics, v. 6, no. 3, p. 343–361.
and assess the conditions that triggered crustal melting. Gehrels, G., Rusmore, M., Woodsworth, G., Crawford, M., Andronicos, C.,
Hollister, L., Patchett, J., Ducea, M., Butler, R., Klepeis, K., Davidson,
C., Friedman, R., Haggart, J., Mahoney, B., Crawford, W., Pearson, D.,
FUTURE DIRECTIONS and Girardi, J., 2009, U-Th-Pb geochronology of the Coast Mountains
The conveners are excited by the scientific enthusiasm and batholith in north-coastal British Columbia: Constraints on age and
knowledge displayed by the participants. The spectacular outcrops tectonic evolution: Geological Society of America Bulletin, v. 121,
no. 9–10, p. 1341–1361, https://doi.org/10.1130/B26404.1.
led to numerous discussions about the research needed to further Hollister, L.S., 1982, Metamorphic evidence for rapid (2 mm/yr) uplift of a
our understanding of magma generation and batholith evolution. portion of the Central Gneiss Complex, Coast Mountains, B.C.: Canadian
We look forward to future research addressing the many open Mineralogist, v. 20, p. 319–332.
questions highlighted by this Thompson Field Forum. Hollister, L.S., and Andronicos, C.L., 2006, The formation of new
continental crust in western British Columbia during transpression and
transtension: Earth and Planetary Science Letters, v. 249, p. 29–38.
ACKNOWLEDGMENTS Hutchison, W.W., 1982, Geology of the Prince Rupert–Skeena Map Area,
This Thompson Field Forum could not have been held without the British Columbia: Geological Survey of Canada Memoir 394, 116 p.
generous financial and logistical assistance from the Geological Society of Morozov, I.B., Smithson, S.B., Hollister, L.S., and Diebold, J.B., 1998,
America, James B. Thompson, the National Science Foundation, Seabridge Wide-angle seismic imaging across accreted terranes, southeastern Alaska
Gold Inc., the University of Alabama, and Occidental College. The Metlakatla and Western British Columbia: Tectonophysics, v. 299, p. 281–296.
First Nation kindly allowed us access to their land on Carr Island. Roddick, J.A., 1970, Douglas Channel–Hecate Strait Map Area, British
Columbia: Geological Survey of Canada Paper 70-41, 56 p.
REFERENCES CITED Wolf, D.E., Andronicos, C.L., Vervoort, J.D., and Mansfield, M.R., 2010,
Cecil, M.R., Rusmore, M.E., Gehrels, G.E., Woodsworth, G.J., Stowell, Application of Lu-Hf garnet dating to unravel the relationships between
H.H., Yokelson, I.N., Chisom, C., Trautman, M., and Homan, E., 2018, deformation, metamorphism and plutonism: An example from the Prince
Along-strike variation in the magmatic tempo of the Coast Mountains Rupert area, British Columbia: Tectonophysics, v. 485, no. 1, p. 62–77.
batholith, British Columbia, and implications for processes controlling
episodicity in arcs: Geochemistry, Geophysics, Geosystems, v. 19,
https://doi.org/10.1029/2018GC007874.

22 GSA Today | March-April 2019