Platinum and palladium in the Ivrea-Verbano basic complex, Western Alps, Italy

摘要: The Ivrea-Verbano Basic Complex consists of a lower part composed cyclic units made up cumulate peridotites, pyroxenites, gabbros, and anorthosites, an upper consisting huge, almost homogeneous body gabbro-norite grading upward into diorites. whole basic sequence is cut by more or less discordant pyroxenitic dikes. Septa the crystalline basement occur at various positions in complex, locally confirming multistage origin intrusion.The platinum-group elements associated with massive disseminated sulfide concentrations layers close to metasediments, discrete aggregates stockwork mineralizations dikes, as dispersed well-defined ultramafic (pegmatoid clinopyroxenites).In first association only minerals platinum group that have so far been identified are Pd tellurides; Pt probably contained solid solution sulfides. Although occurs higher second association, no detected any samples investigated date, which indicates all third contrast, contains sulfides, it would seem relatively high values these rocks pyroxenes.