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AUTIGENIC MINERAL FORMATION AS AN OBJECTIVE FACTOR OF TRANSFORMATION OF TECHNOGENIC PLACERS

P. P. Safronov 1, I. V. Kuznetsova 2

1 Far East Geological Institute, Far East Branch of the RAS, Vladivistok, Russia; 2 Institute of Geology and Nature Management of Far East Branch of the RAS, Blagoveshchensk, Russia

The paper presents the data of analytical scanning electron microscopy and mineralogical methods for studying the morphology and chemical composition of spiral man-induced products, metal spheroids and native gold from the alluvial mining waste. In all samples, including the tungsten “spiral”, mercurous gold was found. The spheroids were diagnosed as lead ones with a fine impregnation of alumina-silicate substance, antimony and copper ones with autigenic isometric and xenomorphic mineral deposits on the surface, etc. The inclusion of carbon in many newly formed minerals confirms the leading role of this element in the process of technogenic mineral formation as a reducing agent. The identified chemical diversity of numerous ore and rock phases is explained by complex physico-chemical processes occurring in the technogenic system, in which not only the residual gold is transformed, but also new ore-mineral complexes, including gold-containing ones, arise.

Keywords: technogenic placers, micro- and nano-minerals, microphases, lead metal, antimony, copper and gold.

DOI 10.20403/2078-0575-2021-3-83-93

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