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The Selcuk nappe contains blocks of metagabbro in a matrix of serpentinite and garnet-mica schist.
These rocks are ultramafic and include serpentinite , harzburgite, diallage, and rodingite.
The resulting rock, called serpentinite , has a much lower density than the original peridotite, thereby increasing the relative buoyancy of the future ophiolite - and with this its chances of obduction.
It has also been found in silica-poor igneous rocks, such as syenite, nepheline syenite, serpentinite , and lamprophyre.
Compositionally, the turbidites are mostly feldspathic litharenites with trace amounts of serpentinite , anorthosite and mafic volcanic clasts.
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