Time sequence of Himalayan endogenetic mineralization on the east side of the Qinghai-Tibet plateau

Among the endogenetic deposits in the Sanjiang area and at the west margin df the Yangtze platform, Himalayan deposits are the most important and cont ribute a large proportion of the resources of superlarge deposits. Among th e controlled resources of this region, 84% of copper resources, 67% of Pb-Z n, 31% of Ag, 77% of gold and 24% of tin come from Himalayan deposits on th e east side of the Qinghai-Tibet plateau. Himalayan endogenetic mineralizat ion shows a relatively complete sequence evolution in the Sanjiang area and on the west margin of the Yangtze platform. Mineralization is manifested b y gold deposits related to It-rich lamprophyre, REE deposits related to alk alic complexes and Cu-Au-polymetallic deposits related to alkaline porphyry . Six sequences of mineralization evolution since 65 Ma B.P. in the Sanjian g area and on the west side of the Yangtze platform can be recognized. Hima layan endogenetic mineralization on the east side of the Qinghai-Tibet plat eau reached its peak before the Oligocene, corresponding to episodes I and II of the intracontinental orogenic cycle. Afterwards, mineralization waned obviously.