Abstract
Pyrite crystals from gold deposits of various genetic types (mesothermal and epithermal) were examined by techniques of x-ray photoelectron and Auger electron microscopy and by scanning probe microscopy. The results confirm a conclusion made in earlier hydrothermal experiments that nonautonomous phases (NP) of variable composition occur on the surface of pyrite crystals. These phases are localized within a layer of submicrometer (nanometer) thickness (up to ∼0.5 μm) within which the typochemistry of pyrite surface is pronounced. The development of sulfate on the surface of pyrite crystals from epithermal Au-Ag deposits is a typochemical feature of the origin of their ore mineralization at low temperatures and shallow depths. Supergene conditions are characterized by the presence of an oxi-hydroxide or oxide film of FeIII, which morphologically differs from the layer of a pyrite-like NP. The composition and properties of the NPs are different for pyrite from mesothermal and epithermal deposits: they are close to those of a pyrrhotite-like NP discovered on synthetic hydrothermal pyrite and contain an additional sulfite anion for pyrite from the former type of deposits and are close to sulfide-disulfide ensembles with trivalent Fe for pyrite from the latter type of deposits. Trace elements, including precious metals, can be accommodated in such a phase via the stabilization of clusters with Fe3+ and SO 2−4 in its structure. The instability of the crystallization process in epithermal environments may bring about the development of double-level nanostructure because of the structural transformation of vicinal surfaces into a set of ordered domains and the synthesis of nonautonomous “precursor” phases. Such systems can be stabilized via the excess dissolution of admixtures or the transition of the surface layer into another phase state.
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V. L. Tauson, R. G. Kravtsova, and V. I. Grebenshchikova, “Chemical Typomorphism of the Surface of Pyrite Crystals of Gold Ore Deposits,” Dokl. Akad. Nauk 399, 673–677 (2004) [Dokl. Earth Sci. 399, 1291–1295 (2004)].
V. L. Tauson and R. G. Kravtsova, “Chemical Typomorphism of the Mineral Surface: Compositional Specifics of the Surface: An Example of Gold-Bearing Pyrite from Epithermal Deposits,” Geol. Geofiz. 45(2), 222–227 (2004).
G. B. Naumov, “Current Relations between Mineralogy, Geochemistry, and Physical Chemistry,” in Theory and Methodology of Mineralogy (Komi FAN SSSR, Syktyvkar, 1985), Vol. 1, pp. 23–24 [in Russian].
V. L. Tauson, D. N. Babkin, E. E. Lustenberg, et al., “Surface Typochemistry of Hydrothermal Pyrite: Electron Spectroscopic and Scanning Probe Microscopic Data. I. Synthetic Pyrite,” Geokhimiya, No. 6, 615–628 (2008) [Geochem. Int. 46, 565–577 (2008)].
V. L. Tauson and N. V. Smagunov, “Composition of the Surface of Pyrrhotite (Fe1 − x S) Crystals Synthesized in Association with Greenockite (α-Cd,Fe)S) under Hydrothermal Conditions: Introduction into the Geochemistry of Nonautonomous Phases,” Geokhimiya, No. 4, 448–454 (2004) [Geochem. Int. 42, 377–382 (2004)].
V. I. Grebenshchikova and A. P. Shmotov, “Stages of the Formation of the Zun-Kholba Gold Deposit, Eastern Sayan,” Geol. Geofiz. 38(4), 756–764 (1997).
R. G. Kravtsova, “Mineralogical-Geochemical Zoning and Formation of Gold-Silver Deposits (Russian Northeast),” Geol. Geofiz. 39(6), 763–777 (1998).
V. G. Khomich, “Pokrovskoe Gold Deposit,” in Ore Deposits at Continental Margins (Dal’nauka, Vladivostok, 2001), Part 3, No. 2, pp. 284–321 [in Russian].
H. W. Nesbitt and I. J. Muir, “Oxidation States and Speciation of Secondary Products on Pyrite and Arsenopyrite Reacted with Mine Waste Waters and Air,” Mineral. Petrol. 62, 123–144 (1998).
P. B. Barton, Jr. and B. J. Skinner, “Sulfide Mineral Stabilities,” in Geochemistry of Hydrothermal Ore Deposits, (Wiley, New York, 1979), pp. 278–403.
V. V. Akimov, I. N. Gerasimov, V. L. Tauson, et al., “Microstructure and Chemical Composition of Nonautonomous Phases on the Surface of Crystals of Hydrothermally Synthesized Pyrrhotite (Fe1−x S),” Surface and XRay, Synchrotron, and Neutron Studies, No. 12, 27–32 (2006).
A. G. Schaufuss, H. W. Nesbitt, I. Kartio, et al., “Incipient Oxidation of Fractured Pyrite Surfaces in Air,” J. Electron. Spectrosc. Relat. Phenom. 96, 69–82 (1998).
G. K. Czamanske, “The Stability of Argentopyrite and Sternbergite,” Econ. Geol. 64, 459–461 (1969).
H. Binder, “Die Anwendung der Rontgenphotoelectronenspectroskopie zur Klarung von Bindungsfragen in Eisen-Schwefelverbindungen,” Z. Naturforsch., A: Phys. Sci. 28, 255–262 (1973).
K. A. Sablina, V. V. Ikonnikov, and A. G. Klimenko, “Amorphization of KFeS2 and RbFeS2,” in Magnetic and Resonance Properties of Magnetic Dielectric (Krasnoyarsk, 1985), pp. 194–206 [in Russian].
B. Singh, D. M. Sherman, R. J. Gilkes, et al., “Incorporation of Cr, Mn and Ni into Goethite (α-FeOOH): Mechanism from Extended X-Ray Absorption Fine Structure Spectroscopy,” Clay Miner. 37, 639–649 (2002).
I. Hassan and P. R. Buseck, “Incommensurate-Modulated Structure of Nosean, a Sodalite-Group Mineral,” Am. Mineral. 74, 394–410 (1989).
M. E. Fleet and S. L. Chryssoulis, and P. J. MacLean, “Arsenian Pyrite from Gold Deposits: Au and As Distribution Investigated by SIMS and EMP, and Color Staining and Surface Oxidation by XPS and LIMS,” Can. Mineral. 31, 1–17 (1993).
V. A. Shchukin and D. Bimberg, “Spontaneous Ordering of Nanostructures on Crystal Surfaces,” Rev. Mod. Phys. 71, 1125–1171 (1999).
V. Tauson, R. Kravtsova, and V. Grebenshchikova, “Surface Nature of Main Part of Invisible Gold and Estimation of Structurally Bound Gold in Pyrite of Gold Ore Deposits,” in 12th Quadrennial IAGOD Symposium, Moscow, Russia, 2006. Program and Short Abstracts, Ed. by S. V. Cherkasov (Moscow, 2006), No. 168.
V. L. Tauson, “Distribution of Ore Microcomponents between Mineral Crystals and Hydrothermal Solutions as a Method for Estimating the Metal Potential of Ore-Forming Fluids,” in Proceedings of International Conference on Topical Problems in Ore Genesis and Metallogeny, Novosibirsk, Russia, 2006 (Geo, Novosibirsk, 2006), pp. 218–219 [in Russian].
V. L. Tauson and N. V. Smagunov, “Influence of Associated Elements on Gold Behavior in the System Fe-S-Aqueous Salt Solution at a Temperature of 400°C and a Pressure of 100 MPa,” Geol. Geofiz. 38(3), 667–674 (1997).
V. L. Tauson, “Systematics of Processes of Trace Element Uptake by Real Mineral Crystals,” Geokhimiya, No. 2, 213–219 (2005) [Geochem. Int. 43, 184–190 (2005)].
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Original Russian Text © V.L. Tauson, R.G. Kravtsova, V.I. Grebenshchikova, E.E. Lustenberg, S.V. Lipko, 2009, published in Geokhimiya, 2009, No. 3, pp. 245–258.
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Tauson, V.L., Kravtsova, R.G., Grebenshchikova, V.I. et al. Surface typochemistry of hydrothermal pyrite: Electron spectroscopic and scanning probe microscopic data. II. Natural pyrite. Geochem. Int. 47, 231–243 (2009). https://doi.org/10.1134/S0016702909030021
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DOI: https://doi.org/10.1134/S0016702909030021