Crust termobaric transformations of mineral matter and connected with them seismic vertical stratification of lithosphere
In the resent years fragmentary crustal low velocity zones were revealed by DSS profiles at depths of 3-25 km around the Earth. In most cases they are considered as thermodynamical phenomena rather than a result of changing composition when mineral material is transformed by pressure and temperature at the depth of their occurrence. Multimethod laboratory studies of sample show that under PT conditions at 5-15 km depths rocks are subjected to cataclastic and dilatational changes.