Fault-bounded geologic entities of regional
extent, each characterized by a geologic history that is different
from geologic histories of contiguous terranes. The term was
coined by Peter Coney and modified by Davie Jones in an
attempt to explain the juxtaposition of very different faultbounded
blocks of rock in the North American Cordillera, and
later modified to include seafloor topographic highs such as
seamounts, oceanic plateaus, and even island arcs. The application
of the term was of some use in separating units of different
origin in the Cordillera and other orogenic belts. Some
geologists were overzealous in the application of the term and
the concept, however, and divided orogens into hundreds of
terranes, many of which were merely fragments of the same
terrane that were separated by strike-slip or other faults. In
addition, some workers used the concept as an end in itself
without attempting to understand the origin of the terranes, as
done in more traditional tectonic analysis.
See also PLATE TECTONICS.
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