Volume 2, Number 3 (1975)
Articles

An Ensimatic Island Arc and Ocean Closure in the Grenville Province of Southeastern Ontario, Canada

R. L. Brown
Department of Geology, Carleton University, Ottawa, Ontario.
J. F. Chappell
Department of Geology, Carleton University, Ottawa, Ontario.
J. M. Moore Jr.
Department of Geology, Carleton University, Ottawa, Ontario.
P. H. Thompson
Department of Geology, Carleton University, Ottawa, Ontario.
Published August 8, 1975
How to Cite
Brown, R. L., Chappell, J. F., Moore Jr., J. M., & Thompson, P. H. (1975). An Ensimatic Island Arc and Ocean Closure in the Grenville Province of Southeastern Ontario, Canada. Geoscience Canada, 2(3). Retrieved from https://journals.lib.unb.ca/index.php/GC/article/view/2933

Abstract

Within the Grenville Province of Southeastern Ontario geological data may be interpreted in the light of plate tectonic theory. An early cycle involving subduction of oceanic lithosphere, generation of an island arc complex together with partial melting of the down-going slab to produce calc-alkalic volcanism and granodioritic intrusions, was followed by a second cycle during which the island arc was uplifted, eroded and covered by miogeoclinal sediments. Subsequently the miogeocline was deformed presumably during continental collision. The evolution from early island arc phase to ocean closure and consolidation took approximately 250 m.y.