Neptunian dikes and fissures are intimately associated with a minor Archean sedimentary basin near Timmins, Ontario, in the southwestern part of Abitibi Subprovince of the Canadian Shield. These structures are associated with the late Archean Timiskaming unconformity, and were formed by clastic sedimentation in fissures opened by the reactivation and dilation of basement faults along a major crustal shear. A "pull-apart" origin is indicated for the sedimentary basin by published township maps and the underground geology of the Dome gold mine. The neptunian dikes and fissures are discussed in relation to previous stratigraphic and tectonic interpretations of the Timmins area.

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