Age and genetic relationships of rare-metal ore-bearing granites of voznesenka ore field, primorye: Rb-Sr and Sm-Nd isotopic data

摘要

On the basis of Rb-Sr and Sm-Nd data two types of ore-bearing granite massifs-biotite and Li-F protolithionite- coincide in the time formation, 450m.y.ago, but differ considerably in #epsilon#_(Nd)-5 and -3, respectively. This fact supports the model of the formation of rare-metal ore-bearing granites composing Voznesenka ore field from single magmatic source but at the expense of different share of mantle fluid. The main greisen and rare-metal-fluorite mineralization stage is confined by the age of intramineral picrodolerite and subalkaline basaltic dykes which is 405 Ma. The last magmatic activity was connected with postmineral dyke series with the age 350 Ma. THe magmatic associations recognised within the ore field were originated from the same Precambrian crust-mantle mixture magmatic source evolved with time, which was another than granite source.