Bohemia Ecological Preserve

Rocks beneath the oceanís crust, such as peridotite, are very rich in iron, magnesium, chromium and nickel. During subduction these rocks were oxidized and serpentinized during relatively low temperature and low pressure alteration. In the process large amounts of water were absorbed into the rock increasing the volume and destroying the structure. Because serpentine has a much lower density than peridotite, it rose toward the surface along major regional thrust faults associated with the subduction zones.