NDLI: The noble metal distribution in the black shales of the Degdekan gold deposit in Northeast Russia

Content Provider	Springer Nature Link
Author	Khanchuk, A. I. Plyusnina, L. P. Nikitenko, E. M. Kuzmina, T. V. Bariv, N. N.
Copyright Year	2011
Abstract	The mineral and chemical composition of the carbon-bearing rocks of the Late Permian Pionerskaya Formation containing the Degdekan gold deposit has been studied. The bulk contents of Au, Ag, Pt, and Pd in the black shales and their light, sulfide, and electromagnetic fractions were determined by electrothermal atomization. The mineral composition and the phase analysis of the rocks were studied using a scanning electron microscope. Gold is present as fine xenomorphic grains of high fineness with an Fe admixture of up to 4 at %, as well as intergrowths of kustelite and electrum. The Au and Pt contents in the black shales and ores vary in a wide range (g/t): Au 0.01–13.12, Pt 0.001–1.34. The highest Au contents (up to 1748 g/t) were noted in the sulfide fraction. The Pt-bearing phases were not found, whereas a Pt content of about 0.61 wt % was determined using an electron microscope in a carbonaceous matrix. The initial rocks have a steady and low Pt content (less than 0.007 g/t). A stable even Au distribution in the studied rocks was established within 1.14–2.46 g/t. The chemical analysis of the soluble fraction of the carbonaceous matter extracted from the black shales showed the presence of Au 0.375, Ag 3.68, Pt 0.147, and Pd 0.052 g/t. It has been concluded that the carbon-bearing rocks of the Pionerskaya Formation play a resource role in the accumulation of noble metals, whereas economic concentrations of the latters are formed in the course of the superimposed metamorphic-hydrothermal processes.
Starting Page	89
Ending Page	96
Page Count	8
File Format	PDF
ISSN	18197140
Journal	Russian Journal of Pacific Geology
Volume Number	5
Issue Number	2
e-ISSN	18197159
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2011-04-20
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	black shales gold silver platinum palladium Degdekan deposit Magadan region Northeast Russia Geology
Content Type	Text
Resource Type	Article
Subject	Geology Geophysics Geochemistry and Petrology Oceanography Paleontology Stratigraphy

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