Abstract
The new results of geologic-structural, petrographic and mineralogic- geochemical researches of Mykert-Sanzheevka ore field—the Uda-Vitim mineragenic zone South-West ending of West Transbaikalia are given. Its main ore-controlling structure, represented by losange, consisting of rhombohedral and tetrahedral blocks-duplexes mosaic clusters, which are separated by narrow tectonic sutures, is specified. It is clarified that polycomponent ores clusters are confined with these small-block sutures, made by subvolcanic dykes of shoshonite-latite volcano-plutonic association (233 - 188 million years), apodyke dynamometamorphites (breccias, cataclasite, mylonites) and also mechanometasomatites. Four stages of the dynamometamorphites formation characterized by different species compositions of ore minerals appeared as a result of mechanochemical reactions are determined. A carbonyl model of mineral microaggregates formation with films containing noble metal nanoparticles is proposed. Ore-forming system features of Mykert-Sanzheevka field are considered.
Highlights
IntroductionThe result of these researches was the identification and prediction of polycomponent noble-metal clusters (Au, Ag, Pt, Pd) and noble-metal-polymetallic (Pb, Zn, Ag, Au, Pt, Ru) ores in many ore fields, and in Mykert-Sanzheevka too [1]-[6]
From the past researches vision field, the question of ore formation processes linkage with tectonic-metamorphic transformations of host rocks fell out. We considered it recent time on the example of polycomponent noble-metal ores in Irokinda and Irba deposits to which as well as to Mykert-Sanzheevka ore field, platinoids high contents with outstanding mineral occurrence forms are inherent [4] [6]
We propose carbonyl model of noble metals nano- and microparticles formation in polycomponent ores of Mykert-Sanzheevka field that is substantiated by a number of signs, characteristic to chemical technologies for producing metal films and coatings [23] [24] [25]
Summary
The result of these researches was the identification and prediction of polycomponent noble-metal clusters (Au, Ag, Pt, Pd) and noble-metal-polymetallic (Pb, Zn, Ag, Au, Pt, Ru) ores in many ore fields, and in Mykert-Sanzheevka too [1]-[6]. The absence of PGE microphases allowed us to conclude that they are concentrated in an invisible form, most likely in the form of cluster compounds (nanoparticles) in sulfides which consist of PGE atoms groups surrounded by a dense layer of ligands (atoms H, Cl, C, S, etc.)
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