'The genetic association of adakites and Cu-Au ore deposits': a reply

摘要

Most of the world's Cu resources are hosted in the west coast of the North and South American continents along the eastern Pacific margin, with estimated total resources of over 1.8 billion tons, accounting for about 60% of the world's total Cu resource estimation (US Geological Survey Resource Estimation Team 2010). Among the world's top 25 giant porphyry Cu deposits, 20 arc located there. In contrast, essentially no porphyry Cu deposits have been reported in Japan, whereas Grasberg is the only top 25 porphyry deposits along the western Pacific margin, with several smaller deposits mostly associated with the closure of back-arc basins (e.g. Cooke et al. 2005;;Sun et al. 2010). The most remarkable difference is that the subducting oceanic crust in the east Pacific margin is much younger than in the west, and thus is more likely to be partially melted (Defant and Drummond 1990;;Sun et al. 2010).