Geological characteristics and ore contents in the cryptoexplosive breccias from eastern Xizang

The large quantities of cryptoexplosive breccia pipes (veins) from eastern Xizang are found to be associated with the Himalayan porphyries. These cryptoexplosive breccias have almost been subjected to intense mineralization and alteration, and are rich in gold, silver and mercury. Integration of inclusion and isotopic data show that the explosive fluids from which the cryptoexplosive breccias are originated should be considered as the intermediate high-temperature fluids that may be associated with magmas and postmagmatic ore fluids.