DEFINITION OF SUTURE ZONE

The structurally complex zone marking the

place where two once separated tectonic plates have collided

and the oceans that once separated the plate have closed.

Sutures may mark the places where two continents that were

previously on opposite sides of an ocean basin have collided,

or they may mark the collision zones between continents, arc

terranes, oceanic plateaus, or other seafloor topographic highs.

Suture zones are very complex and structurally variable, typically

marked by numerous shear zones, including mylonite

zones, faults, and mélanges. Ophiolites are commonly found

decorating the suture zones. These may range from complete

ophiolite sequences to partial ophiolites, to thin mafic or ultramafic

slivers in deep-level high-grade shear zones.

See also PLATE TECTONICS.

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