P-T-X parameters of metamorphogene and hydrothermal fluids, isotopy and age of the Bogunai gold deposit, southern Yenisei Ridge (Russia)

Тип публикации: статья из журнала

Год издания: 2015

Идентификатор DOI: 10.1016/j.rgg.2015.05.007

Ключевые слова: quartz, sulfides, gold, ore-forming fluid, hydrocarbons, delta S-34, Ar-Ar age, Ar-Ar age, Gold, Hydrocarbons, Ore-forming fluid, Quartz, S34S, Sulfides, argon-argon dating, crystallization, fluid inclusion, gold, granulite, hydrothermal fluid, ore-forming fluid, P-T conditions, quartz, sulfide, Krasnoyarsk [Russian Federation], Russian Federation, Yenisei Ridge

Аннотация: Fluid inclusions in quartz, sulfides from quartz veins, and quartz, garnet, plagioclase, and orthoclase from granulites of the Bogunai gold deposit located in the granulites of the Angara-Kan block of the Yenisei Ridge were studied by thermobarometry, gas chromatography, chromato-mass-spectrometry, Raman spectroscopy, and mass spectrometry with inductively coupled plasma. The formation temperatures (850-950 degrees C) and pressures (8.5-9.0 kbar) of minerals of the granulite metamorphic facies are much higher than the crystallization temperatures (220-420 degrees C) and pressures (0.1-1.6 kbar) of gold-quartz veins of the Bogunai deposit. These veins formed with the participation of H2O-CO2-hydrocarbon fluids with a salt (predominantly MgCl2) concentration of 2-19 wt.% NaCl equiv. The gas phase of fluid inclusions from quartz, pyrite, chalcopyrite, galena, and sphalerite contains not only H2O, CO2, CH4, and N-2 but also the first found compounds of sulfur (CS2, O2S, COS, C2H6S2) and nitrogen (C3H7N, C3H7NO, C4H8N2O) and numerous hydrocarbons of different classes (paraffins, arenes, naphthenes, alcohols, aldehydes, ketones, carbonic acids, and furans). The age of the Krasnoyarsk mineralized zone, one of the sites of the Bogunai deposit, is 466 +/- 3.2-461.6 +/- 3.1 Ma, which is almost 1400 Ma younger than the age of granulite metamorphism and 255 Ma younger than the age of diaphthoresis but is close to the age of the Lower Kan granitoid pluton (455.7 +/- 3.4 Ma). The sulfur isotope ratios (delta S-34) of sulfides (pyrite, chalcopyrite, sphalerite, and galena) are close to the mantle values, 0.8 to 3.5%, and are in the range of the granitoid values, which indicates the crustal source of the fluid sulfur. Gold of the Bogunai deposit accumulated with the participation of H2O-CO2-hydrocarbon fluids generated both in deep-fault zones and in granitoid intrusions. (C) 2015, V.S. Sobolev IGM, Siberian Branch of the RAS. Published by Elsevier B.V. All rights reserved.

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Издание

Журнал: RUSSIAN GEOLOGY AND GEOPHYSICS

Выпуск журнала: Vol. 56, Is. 6

Номера страниц: 903-918

ISSN журнала: 10687971

Место издания: AMSTERDAM

Издатель: ELSEVIER SCIENCE BV

Авторы

  • Ryabukha M.A. (Russian Acad Sci, Siberian Branch, VS Sobolev Inst Geol & Mineral, Novosibirsk 630090, Russia)
  • Gibsher N.A. (Russian Acad Sci, Siberian Branch, VS Sobolev Inst Geol & Mineral, Novosibirsk 630090, Russia)
  • Tomilenko A.A. (Russian Acad Sci, Siberian Branch, VS Sobolev Inst Geol & Mineral, Novosibirsk 630090, Russia)
  • Bul'bak T.A. (Russian Acad Sci, Siberian Branch, VS Sobolev Inst Geol & Mineral, Novosibirsk 630090, Russia)
  • Khomenko M.O. (Russian Acad Sci, Siberian Branch, VS Sobolev Inst Geol & Mineral, Novosibirsk 630090, Russia)
  • Sazonov A.M. (Siberian Fed Univ, Inst Min Geol & Geotechnol, Krasnoyarsk 660041, Russia)

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