Crustal Formation at Depth During Continental Collision

  • L. S. Hollister
  • M. L. Crawford
Part of the NATO ASI Series book series (ASIC, volume 317)


The rapid (1–2 mm/yr) and substantial (over 10 km) Tertiary exhumation of the Coast Crystalline Complex near Prince Rupert, British Columbia led to the exposure of rocks formed at crustal depths of 15-20 km and greater. Abundant sills, mostly tonalite in composition, delivered a thermal pulse which locally raised temperatures to the low-pressure granulite facies within the intruded section. The thermal pulse and exhumation are recorded by the metamorphic mineral assemblages and textures, and by isotopic cooling ages. The net result of the thermal and deformation events is a sequence more than 10 km thick of interlayered migmatite, tonalite sills, ductile high strain zones, sillimanite- and garnet-rich rocks (stronalite), other metasedimentary rocks, and amphibolite. Foliations in all units dip gently except where cut by near vertical ductile shear zones, within which foliations are sub-parallel to the shear zone boundaries. During uplift, strain was concentrated in the ductile shear zones. If the section had not been exhumed, seismic reflection profiling would show shallow dipping reflectors in the deep crust due to the contrast in density and fabric of the layers.


Shear Zone Metamorphic Condition Ductile Shear Zone Early Tertiary Seismic Reflection Profile 
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  1. Armstrong, R.L., and Runkle, D. (1979) ‘Rb-Sr geochronometry of the Ecstall, Kitkiata, and Quottoon plutons and their country rocks, Prince Rupert region, Coast Plutonic Complex, British Columbia.’ Canadian Journal of Earth Science 16, 387–399.CrossRefGoogle Scholar
  2. Arth, J.G., Barker, F. and Stern, T.W. (1988) ‘Coast Batholith and Taku plutons near Ketchikan, Alaska: Petrography, Geochronology, Geochemistry, and Isotopic Character.’ American Journal of Science 288-A, 461–489.Google Scholar
  3. Crawford, J.L., Hollister, L.S., Woodsworth, G.J. (1987) ‘Crustal deformation and regional metamorphism across a terrane boundary: Coast Plutonic Complex, British Columbia.’ Tectonics 6, 343–361.CrossRefGoogle Scholar
  4. Douglas, B.J. (1986) ‘Deformational history of an outlier of metasedimentary rocks, Coast Plutonic Complex, British Columbia, Canada.’ Canadian J. Earth Sci. 23, 813–826.CrossRefGoogle Scholar
  5. Frost, B.R., and Chacko, T. (1989) ‘The granulite uncertainty principle: limitations on thermobarometry in granulites.’ Journal of Geology 97, 435–450.CrossRefGoogle Scholar
  6. Furlong, K.P. and Fountain, D.M. (1986) ‘Continental crustal underplating: Thermal considerations and seismic-petrologic consequences.’ J. Geophys. Res. 91, 8285–8294.CrossRefGoogle Scholar
  7. Hill, M.L. (1985) ‘Geology of the Redcap Mountain area, Coast Plutonic Complex, British Columbia.’ Unpublished Ph.D. Thesis, Princeton University, Princeton, NJ, 216 pp.Google Scholar
  8. Hollister, L.S. (1977) ‘The reaction forming cordierite from garnet, the Khtada Lake metamorphic complex, British Columbia.’ Can. Mineral. 15, 217–229.Google Scholar
  9. Hollister, L.S. (1982) ‘Metamorphic evidence for rapid (2 mm/yr) uplift of a portion of the Central Gneiss Complex, Coast Mountains, British Columbia.’ Canadian Mineralogist 20, 319–332.Google Scholar
  10. Hollister, L.S. and Crawford, M.L. (1986) ‘Melt-enhanced deformation: A major tectonic process.’ Geology 14, 558–561.CrossRefGoogle Scholar
  11. Hutchison, W.W. (1982) ‘Geology of the Prince Rupert-Skeena map-area, British Columbia.’ Memoir Geological Survey of Canada 394, 1–116.Google Scholar
  12. Kenah, C. and Hollister, L.S. (1983) ‘Anatexis in the Central Gneiss Complex, British Columbia.’ In Migmatites, Melting and Metamorphism, M.P. Atherton and C.D. Gribble, eds., Shiva Publ. Co., 142–162.Google Scholar
  13. Lappin, A.R. and Hollister, L.S. (1980) ‘Partial melting in the Central Gneiss Complex near Prince Rupert, British Columbia.’ American Journal of Science 280, 518–545.CrossRefGoogle Scholar
  14. McLellan, E.L. (1988) ‘Migmatite structures in the Central Gneiss Complex, Boca de Quadra, Alaska.’ J. Meta. Geol. 6, 517–542.CrossRefGoogle Scholar
  15. Mehnert, K.R. (1975) ‘The Ivrea zone — a model of the deep crust.’ Neues Jahrb. Mineral. Abh., Part 2, 125, 156–199.Google Scholar
  16. Parrish, R.R. (1983) ‘Cenozoic thermal evolution and tectonics of the Coast Mountains of British Columbia 1, Fission track dating, apparent uplift rates, and patterns of uplift.’ Tectonics 2, 601–631.CrossRefGoogle Scholar
  17. Selverstone, J. and L.S. Hollister (1980) ‘Cordierite-bearing granulites from the Coast Ranges, British Columbia: P-T conditions of metamorphism.’ Canadian Mineralogist 18, 119–129.Google Scholar
  18. Sisson, V.B. (1985) ‘Contact metamorphism and fluid evolutionassociated with the intrusion of the Ponder Pluton, Coast Plutonic Complex, British Columbia, Canada.’ Ph.D. Thesis, Princeton University, 345 pp.Google Scholar
  19. Woodsworth, G.J. (1979) ‘Geology of the Whitesail Lake map-area, British Columbia.’ Geological Survey of Canada Current Research, Part A, Paper 79-1A, 71–75.Google Scholar
  20. Woodsworth, G.J., Loveridge, W.D., Parrish, R.R. and Sullivan, R.W. (1983) ‘Uranium-lead dates fron the Central Gneiss Complex and Ecstall pluton, Prince Rupert map area, British Columbia.’ Canadian Journal of Earth Science 20, 1475–1483.CrossRefGoogle Scholar
  21. Wyllie, P.J. (1977) ‘Crustal Anatexis: an experimental review.’ Tectonophysics 43, 41–71.CrossRefGoogle Scholar

Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • L. S. Hollister
    • 1
  • M. L. Crawford
    • 2
  1. 1.Dept. of Geological and Geophysical SciencesPrinceton UniversityPrincetonUSA
  2. 2.Department of GeologyBryn Mawr CollegeBryn MawrUSA

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