Известия Томского политехнического университета: Инжиниринг георесурсов (May 2019)
Petro-geochemical peculiarities and ore mineralization of two subtypes of anorogenic granitoids in Mountain Altai
Abstract
The urgency of the discussed issue is caused by the need of researching petro-geochemical features of anorogenic granitoids and their ore mineralization. The main aim of the study: substantiation of different ore mineralization of two subtypes of granitoids in Mountain Altai on their petro-geochemical peculiarities. The methods used in the study: The chemical composition on the major petrogenic elements was determined by silicate assay by X-ray fluorescence (XRF) techniques. Rare elements were determined by inductively coupled plasma on the mass spectrometry "OPTIMA-4300", for Cu, Zn, Pb, Li - by the ISP-AES method, the rest elements including REE were determined by the ISP-MS method in the VSEGEI Laboratory (Saint-Petersburg). Calculation of tetrad effect of REE fractionation was carried using the W. Irber method. Results: The authors have determined two subtypes of anorogenic granitoids of Soloneshensky ore district; they were generated under complex conditions of mantle-crust interaction. Different sources of mantle and crust substrate melting for gypersolvus and transsolvus granites were determined. Gypersolvus riebeckite leucogranite of Elinovskii massive were formed with tetrad effect of M-type REE fractionation and generated albitites and skarn uranium rare metals rare earth ore mineralization, but transsolvus riebeckite leucogranites of Kazandinsky massive were accompanied by tetrad effect of W-type REE fractionation and generated lode and greisen tungsten-molibdenium and beryllium ore mineralization.
