Multiple tectonic-magmatic Mo-enrichment events in Yuleken porphyry Cu-Mo deposit, NW China and its’ implications for the formation of giant porphyry Mo deposit

The Yuleken porphyry Cu-Mo deposit located in the Chinese Altay-East Junggar, a section of Central Asian Orogenic Belt, world's largest Phanerozoic subduction-accretionary orogen, witnessed multistage tectonic-magmatic evolution and mineralization from arc to syn- post-collision environment over time span about 52 Ma. Four types molybdenite have been distinguished: (1) primary magmatic-hydrothermal, undeformed porphyry, (2) recrystallized associated with ductile deformation, (3) recrystallized, intrafoliational molybdenite, (4) fracture-related hydrothermal these are characterized by decreasing Re abundances magmatic conditions. Individual non-stoichiometric exhibit following negative correlation between Mo contents: (apfu) = −0.0026 + 0.00268. This trend reflects successive stages tectonic-hydrothermal events island-arc post-collisional setting. These repetitive produced enrichment higher overall grade deposit, recorded progressively concentrations molybdenite. Statistical evaluation giant small deposits worldwide also indicates that will lead lower resource (in single deposit) greater same deposit). Multiple processes related tectonomagmatic episodes large display depletion suggest reworking mantle-derived systems crustal growth may be responsible for ore grade, eventually produce molybdenum deposits.