The Metalliferous Mineralization Associatied with Adakitic Rocks

摘要: Adakitic rocks have important implications for the metalliferous mineralization. This paper introduces nomenclature of"adakitic rocks", distribution and tectonic settings of adakitic associated with The factors that are favorable mineralization discussed in detail at last. Similar to a subducted oceanic crust-derived adakite, the"adakitic rocks"are characterized by following geochemical characteristics: SiO2≥56 wt%, Al2O3≥15 depleted Y (≤18×10-6 ) heavy rare earth element contents (Yb≤1.9×10-6), high Sr (rarely400 ×10-6 ), negligiblypositive Eu anomalies, field strength contents. They can be generated different mechanisms. include arc, within-continent extension, active collisional orogenic belt between continents. Many large giant closely rocks, indicating they huge potential. In arc extension settings, interaction basaltic crust, or sediments, delaminated continental melts, released super critical fluids mantle causes contamination melts peridotites on one side, metasomatism Fe2O3 other side. Thus, raised oxygen fugacity metal sulfides decomposed, which is Cu-Au