Experimental Studies оf Basaltic Melt Contamination by Sedimentary Rocks

The results of experimental study of basaltic melt interaction with different types of sedimentary rocks of the platform shield of the Norilsk region are presented. To study the contamination of basaltic melt with host rocks, the following rocks were used in the experiments: Mokulaev basalt, sandy mudstone, pyrite-bearing sandstone with carbonaceous matter, bituminous dolomite, and marl-anhydrite rock. The experiments were carried out in IEM RAS in a high-temperature furnace at 1 atm, 1250°С. The phase and chemical composition of the coexisting mineral associations and melts were studied, and geochemical and isotopic data of the initial and experimental products were given. It was found that the contamination of basaltic melt with sulfur- and carbon-bearing rocks of the platform cover of the Norilsk region can lead to silicate-sulfide liquation, differentiation and ore-bearing trap magma, and the results of experimental studies can be used to develop a number of prospecting criteria and prediction of sulfide magmatic deposits.