Известия Томского политехнического университета: Инжиниринг георесурсов (Aug 2016)
Ore mineralization from gabbroides of Argysuksky massif (northwest of Eastern Sayan)
Abstract
The relevance of the work is caused by the need of detailed petrological studies of numerous potentially mineralized mafic-ultramafic massifs of the Kan block of the Eastern Sayan to improve the correlation of regional schemes, and to identify Pt-Cu-Ni mineralization in them. The main aim of the research is to study ore specialization of the rocks from Argysuksky massif in order to prove the validity of the previously made assumption on the essential similarity of Talazhinsky and Argysuksky massifs and their possible inclusion in common formational type, as well as to assess the degree of potential prospects of penetration rock for detecting commercial copper-nickel mineralization in it. The methods used in the work: study of ore mineralization in polished sections using a polarizing microscope AxioScope Carl Zeiss; determination of chemical composition of ore mineralization by the method of X-ray spectrum microanalysis using scanning electron microscope Tescan Vega II LMU, equipped with energy-dispersive spectrometry (with a semiconductor Si (Li) detector INCA x-sight) INCA Energy 450 and wave-dispersive spectrometer INCA Wave 700. The results. For the first time the authors identified and diagnosed ore minerals and their material composition in gabbros from Argysuksky massif; separated them into two groups of minerals (magnetite-spinelide-ilmenite and sulphide) and made an assumption on the genetic nature of these minerals. The studied mineralization has high similarity of their specialization, mineral composition and chemistry to mineralization from gabbros of Talazhinsky massif, that confirms the assumption made before on the high similarity of these objects and their assignment to a single formation type. Typomorphic and chemical features of sulphides indicate the fact that their crystallization in gabbros occurred from the original high-iron sulfide melt at high sulfur fugacity and significant role of copper in ore system. The results obtained, along with petrological features, point out on great potential of the array under study for detection of Cu-Ni mineralization.
