Reconstruction of the geometry of accretion during formation of the Bay of Islands ophiolite complex ( Canada).

J. F. Casey, Jeffrey Alan Karson, D. Elthon, E. Rosencrantz, M. Titus

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Abstract

Two types of highly allochthonous ophiolitic terrains crop out adjacent to one another in the Bay of Islands region of SW Newfoundland, Canada, the highly deformed Coastal Complex (CC), exposed as a long, linear belt along the W coast, and the relatively undeformed Bay of Islands Complex (BOIC), to the E. The 2 have an autochthonous relationship and each evolved along a single ridge-transform system. Suggests that a large cylindrical-shaped crustal level subaxial magma chamber extended in a direction parallel with the ridge axial-plane at the time of formation of the BOIC. The CC marks the abrupt truncation of this long, linear magma chamber. A geometric and tectonic model is presented for the accretion process responsible for formation of the Bay of Islands Ophiolite. -from Authors

Original languageEnglish (US)
Pages (from-to)509-528
Number of pages20
JournalTectonics
Volume2
Issue number6
StatePublished - 1983
Externally publishedYes

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ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

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