Trace elements in Cu-Mo porphyry complexes (Siberia, Mongolia)

Distribution of trace elements in magmatic rocks hosting Cu-Mo porphyry deposits (Siberia, Mongolia) has been studied with the aim to elucidate geochemical features of ore-magmatic systems formed during different cycles of Central-Asian mobile belt development. On the basis of data obtained mantle sources of porphyry systems are characterized. During Caledonian cycle an initial source of the essentially Mo porphyry system was located in enriched mantle whereas that of the essentially Cu system was placed in depleted mantle. Porphyry systems initial sources of Hercynian and Mesozoic cycles were situated in enriched mantle. Higher role of crustal matter in Mesozoic porphyry systems was found as compared to Caledonian and Hercynian systems. Distribution of trace elements in various rocks of individual porphyry complex is determined by peculiarities of fluid regime in magmatic system.