Constraints on crustal evolution and gold metallogeny in the Northwestern Jiaodong Peninsula, China, from SHRIMP U–Pb zircon studies of granitoids

摘要: Abstract The northwestern part of the Jiaodong Peninsula, or Zhao-Ye Gold Belt, contains largest lode-gold deposits in China, which are spatially related to several suites intrusive granitoids. Previous attempts provide constraints on timing gold mineralization and its tectonic setting, through studies granitoids, have led conflicting data, dependant isotopic methodology used, resultant genetic models for their setting equivocal. SHRIMP U–Pb complexly zoned zircons Linglong, Luanjiahe Guojialing granitoid suggest that Peninsula is underlain by Precambrian basement with components up 3.4 Ga old. Inherited early Mesozoic age indicate this was reworked at 250–200 Ma, probably during a collisional orogeny involving North China Craton South Craton. were derived from between 165 125 emplaced as post-collisional latest intrusions (at Ma) coinciding broadly superplume activity major plume breakout event Palaeo-Pacific Plate. Importantly, if essentially single event, indicated similar hosting structures deposit characteristics, it can be dated about 126 youngest cut gold-bearing quartz veins, 120 one swarm post-mineralization feldspar-porphyry dykes. Thus, most other metallogenic provinces host so-called mesothermal deposits, late orogenic cycle, late- post-accretion, closely followed emplacement plutonic phase development series anomalously voluminous batholiths.