Comparison of gold levels in black shales from crustal structures of various ages

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Geochemical data provide estimates of the background gold levels in carbonaceous terrigenous-carbonate rocks of various ages that contain gold and copper-sulfide mineralization. Two groups are distinguished amongst gold-bearing carbonaceous rocks: ones with lean mean gold contents (0.4-2 ppb) and ones with elevated mean contents (6-160 ppb). Siberian-platform Proterozoic-trough cupriferous carbonaceous sandstones and shales have reduced and moderate gold contents: 1.6 to 5.6 ppb. Goldfields and deposits are observed most frequently in black shale series of various ages in the zeolite, prehnite-pumpellyite, and greenschist facies of regional metamorphism, which have reduced and elevated mean contents of the noble metal. The main gold concentrator minerals in the country rocks are pyrite, pyrrhotite, arsenopyrite, chalcopyrite, and bornite. -Journal summary

Original languageEnglish
Pages (from-to)19-37
Number of pages19
JournalGeochemistry International
Issue number9
Publication statusPublished - 1995

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics

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