Temporal–Spatial Separation of Cu from Mo in the Jiama Porphyry Copper–Polymetallic Deposit, Southern Tibet, China

Jiama is a super-large porphyry copper–polymetallic deposit located in the Gangdese metallogenic belt of southern Tibet. The consists combination polymetallic skarn, Cu–Mo mineralization at contact between Porphyry and hornfels, distal Au fault. current metal reserves are 7.4 Mt Cu, 0.6 Mo, 1.8 Pb–Zn, 6.65 Moz Au, 360.32 Ag, with skarn to porphyry–hornfels host-rock ratio ~3:1. Based on detailed field laboratory investigations, this paper indicates that: (i) orebodies almost entirely preserved; (ii) emplacement age Cu-bearing plutonic rocks earlier than plutons containing elevated Mo assays; (iii) permeability wall gradually decreases an upward direction; (iv) fluid temperature during precipitation Cu was higher that mineralization; (v) lithospheric pressure same; (vi) laser Raman spectroscopy shows carrying rich magnetite, hematite, anhydrite, pyrite, CO2, CH4; (vii) SR–XRF mapping concentration mineralizing high low when deposited. Conversely, relatively deposition Mo. This study also temporal spatial separation associated Porphyry. Transportation mineralized controlled by rocks, metals related changes along redox front releases hydrothermal brecciation roof