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Acid volcanism and its relationship to the tectonic history of the Cordillera of British Columbia, Canada

  • Première Partie Communications Presentées Au « International Symposium On Volcanology » (Nouvelle-Zélande, Du 22 Nov. À 3 Déc. 1965)
  • Published:

Conclusions

The widespread, explosive eruption of acid volcanic rocks in the early Tertiary represents a unique event in the Phanerozoic history of the Canadian Cordilleran orogen. It coincides with a period of general uplift during which the central part of the former eugeosyncline was subjected to tensional stresses resulting in rifting and block faulting accompanied by submissive intrusion of epizonal, acid plutons. Both the plutons and the acid volcanic rocks are considered to be products of the same magma. Periodic escape of gas from the tops of large magma chambers was accompanied by intense shattering of the roof rocks and expulsion of great volumes of gas-charged magma which produced the thick piles of welded tuff and ignimbrite that characterize the early Tertiary Sloko succession.

The area underlain by the early Tertiary acid volcanic rocks coincides with that of the Whitehorse-Nechako Trough, a belt of prolonged subsidence in which the greatest thickness of eugeosynclinal sedimentary and volcanic rocks accumulated through most of Mesozoic time. This fact, plus the predominance of acidic rather than basic lavas and plutons in the early Tertiary of British Columbia, suggests that these rocks originated from primary anatectic magma rather than acid magma derived through differentiation of a more basic parent.

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Authors and Affiliations

  1. Geological Survey of Canada, Vancouver

    J. G. Souther

Authors
  1. J. G. Souther

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Souther, J.G. Acid volcanism and its relationship to the tectonic history of the Cordillera of British Columbia, Canada. Bull Volcanol 30, 161–176 (1967). https://doi.org/10.1007/BF02597666

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