GRAPHITE-RARE-EARTH MINERALIZATION OF PICRITES OF THE ARIADNE ULTRABASITE-BASITE MASSIF (PRIMORYE)

In the south of the Russian Far East, metalliferous (titanium, gold, platinum, etc.) Late Mesozoic intrusions of ultrabasic basites have been identified within the Sikhote-Alin orogenic belt. In the outer contour of one of them, the Ariadna dike, there are dikes of fluidoexplosive breccias of alkaline picrites, characterized by a fairly high degree of carbonation and enrichment with rare earth elements (REE), as well as Ba, Sr, Zr, V, Cr, Nb, Zn. The most common minerals concentrating REE are monazite-(Ce) and lucasite-(Ce). The total content of lanthanides, dominated by light REE, varies synchronously with the concentration of carbonaceous matter in the form of graphite. Isotope-carbon studies indicate the involvement of mantle and crustal processes in the formation of graphite-rare earth mineralization. It is assumed that the association of graphite with REE minerals can serve as one of the indicators in the predictive assessment of the total ore potential of ultrabasic magmatism. The presence of industrially promising high-carbon ore formations will also have a significant impact on the development of technology for extracting useful components.