Porphyry Cu-Au, Mo and Cu-Mo metallogenic systems in the Qinghai-Tibetan Plateau from subduction and continental collision to transitional settings

摘要

Over the last ten years China has made dramatic progress in exploration and ore discoveries in the Qinghai-Tibetan Plateau.These mineral deposits are associated with Mesozoic Tethys oceanic subduction and Cenozoic India-Eurasia continental collision.Because of this distinctive tectonic evolution, the geology and mineralization of these ore deposits are complex and diverse.However, the metallogeneses under different tectonic settings are poorly understood so far, due to limited exploration and a lack of systematic studies.The metallogenic framework in Tibet can be divided into four principal mineralization epochs.(1) An oceanic subduction setting (≥125-115 Ma) represented by the Duolong super-large, gold-rich, porphyry Cu deposit and the Naruo high-sulfide porphyry Cu(Au) deposit hosted in quartz diorite and granodioritic porphyry in the Bangong arc of northern Tibet (Li et al., 2012;Li et al., 2012, 2013).