The South Tibetan Detachment System is characterised by a lower ductile shear zone, an upper low-angle normal fault and high-angle normal faults. The low-angle normal fault puts in contact the base of the Tibetan Sedimentary Sequence with the high-grade sillimanite-bearing schists and mylonitic leucogranites of the Greater Himlayan Sequence and, in several places, the intervening North Col Formation. In the Rongbuck valley, Sa’er and Nyalam areas (southern Tibet) a sharp contact of the low-angle normal fault is associated to breccias and cataclasites.
