Startseite Crystal chemistry of arsenian pyrites: A Raman spectroscopic study
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Crystal chemistry of arsenian pyrites: A Raman spectroscopic study

  • He Zhang , Gujie Qian , Yuanfeng Cai ORCID logo , Christopher Gibson und Allan Pring
Veröffentlicht/Copyright: 26. Januar 2022
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 107 Heft 2

Abstract

A Raman spectroscopic study on the nature of As-S substitution in natural arsenian pyrite [Fe(S,As)2] is presented, covering a compositional range of 0.01–4.6 at% As. Three Raman-active modes were identified in the Raman spectrum of a nearly pure pyrite: Eg (344 cm−1), Ag (379 cm−1), and Tg(3) (432 cm−1). The Raman vibrational modes exhibit one-mode behavior, and the wavenumbers of optical modes vary approximately linearly with As content, correlating with the change in bond constants with increasing substitution of As for S. The linewidth of the Ag mode increases with increasing As substitution, which may be attributed to the increase in lattice strain associated with the substitution of As for S. This study provides experimental evidence for As-induced structural evolution of pyrite from being stable to metastable before decomposing into other phases. Our results, together with those of another Raman study of arsenian pyrite whose As substitution is more complex, indicate that one cannot use Raman band shifts to determine As content, but for a given As content, can characterize the nature of As substitution, i.e., As for S or As for Fe or both.

Keywords: Arsenian pyrite; Raman spectroscopy; solid solution; structural defect

Funding statement: This study was financially supported by the Australian Research Council (Grants DP140102765, DP200102248), the NSFC projects (Grants 41830426 and 41272055), National Key R&D Program of China (Grant 2016YFC0600205), the China Geological Survey (Grant 12120115034601), and joint Ph.D. project funding from the China Scholarship Council (Grant 201806190162). The authors also acknowledge the expertise, equipment and support provided by Microscopy Australia at the South Australian nodes under the National Collaborative Research Infrastructure Strategy.

Acknowledgments

We thank Benjamin Wade for assistance with EMPA, Juan Li for assistance with EBSD, and Junying Ding for assistance with Raman spectroscopy. This paper greatly benefited from constructive comments and thorough reviews from Ray Frost, Wei Tan, and two anonymous referees.

References cited

Abraitis, P.K., Pattrick, R.A.D., and Vaughan, D. J. (2004) Variations in the compositional, textural and electrical properties of natural pyrite: a review. International Journal of Mineral Processing, 74, 41–59.10.1016/j.minpro.2003.09.002Suche in Google Scholar

Anastassakis, E., and Perry, C.H. (1976) Light scattering and ir measurements in XS2 pryite-type compounds. The Journal of Chemical Physics, 64, 3604–3609.10.1063/1.432711Suche in Google Scholar

Arehart, G.B., Chryssoulis, S.L., and Kesler, S.E. (1993) Gold and arsenic in iron sulfides from sediment-hosted disseminated gold deposits: Implications for depositional processes. Economic Geology, 88, 171–185.10.2113/gsecongeo.88.1.171Suche in Google Scholar

Balabin, A.I., and Sack, R.O. (2000) Thermodynamics of (Zn,Fe)S sphalerite. A CVM approach with large basis clusters. Mineralogical Magazine, 64, 923–943.10.1180/002646100549751Suche in Google Scholar

Blanchard, M., Alfredsson, M., Brodholt, J., Wright, K., and Catlow, C.R.A. (2007) Arsenic incorporation into FeS2 pyrite and its influence on dissolution: A DFT study. Geochimica et Cosmochimica Acta, 71, 624–630.10.1016/j.gca.2006.09.021Suche in Google Scholar

Brostigen, G., Kjekshus, A., Astrup, E.E., Nordal, V., Lindberg, A.A., and Craig, J.C. (1969) Redetermined crystal structure of FeS2 (Pyrite). Acta Chemica Scandinavica, 23, 2186–2188.10.3891/acta.chem.scand.23-2186Suche in Google Scholar

Bryant, R.N., Pasteris, J.D., and Fike, D.A. (2018) Variability in the Raman spectrum of unpolished growth and fracture surfaces of pyrite due to laser heating and crystal orientation. Applied Spectroscopy, 72, 37–47.10.1177/0003702817736516Suche in Google Scholar PubMed

Buerger, M.J. (1934) The pyrite–marcasite relation. American Mineralogist, 19, 37–61.Suche in Google Scholar

Cabri, L.J., Chryssoulis, S.L., de Villiers, J.P., Laflamme, J.G., and Buseck, P.R. (1989) The nature of “invisible” gold in arsenopyrite. Canadian Mineralogist, 27, 353–362.Suche in Google Scholar

Chang, I.F., and Mitra, S.S. (1968) Application of a modified random-element-isodisplacement model to long-wavelength optic phonons of mixed crystals. Physical Review, 172, 924–933.10.1103/PhysRev.172.924Suche in Google Scholar

Cook, N. J., and Chryssoulis, S.L. (1990) Concentrations of invisible gold in the common sulfides. Canadian Mineralogist, 28, 1–16.Suche in Google Scholar

Deditius, A.P., and Reich, M. (2016) Constraints on the solid solubility of Hg, Tl, and Cd in arsenian pyrite. American Mineralogist, 101, 1451–1459.10.2138/am-2016-5603Suche in Google Scholar

Deditius, A.P., Utsunomiya, S., Renock, D., Ewing, R.C., Ramana, C.V., Becker, U., and Kesler, S.E. (2008) A proposed new type of arsenian pyrite: Composition, nanostructure and geological significance. Geochimica et Cosmochimica Acta, 72, 2919–2933.10.1016/j.gca.2008.03.014Suche in Google Scholar

Deditius, A.P., Utsunomiya, S., Ewing, R.C., and Kesler, S.E. (2009) Nanoscale “liquid” inclusions of As-Fe-S in arsenian pyrite. American Mineralogist, 94, 391–394.10.2138/am.2009.3116Suche in Google Scholar

Deditius, A.P., Utsunomiya, S., Reich, M., Kesler, S.E., Ewing, R.C., Hough, R., and Walshe, J. (2011) Trace metal nanoparticles in pyrite. Ore Geology Reviews, 42, 32–46.10.1016/j.oregeorev.2011.03.003Suche in Google Scholar

Deditius, A.P., Reich, M., Kesler, S.E., Utsunomiya, S., Chryssoulis, S.L., Walshe, J., and Ewing, R.C. (2014) The coupled geochemistry of Au and As in pyrite from hydrothermal ore deposits. Geochimica et Cosmochimica Acta, 140, 644–670.10.1016/j.gca.2014.05.045Suche in Google Scholar

Di Benedetto, F., Andreozzi, G.B., Bernardini, G.P., Borgheresi, M., Caneschi, A., Cipriani, C., Gatteschi, D., and Romanelli, M. (2005) Short-range order of Fe2+ in sphalerite by 57Fe Mössbauer spectroscopy and magnetic susceptibility. Physics and Chemistry of Minerals, 32, 339–348.10.1007/s00269-005-0002-9Suche in Google Scholar

Dodony, I., Posfal, M., and Buseck, P.R. (1996) Structural relationship between pyrite and marcasite. American Mineralogist, 81, 119–125.10.2138/am-1996-1-215Suche in Google Scholar

Eyert, V., Höck, K.H., Fiechter, S., and Tributsch, H. (1998) Electronic structure of FeS2: The crucial role of electron-lattice interaction. Physical Review B, 57, 6350–6359.10.1103/PhysRevB.57.6350Suche in Google Scholar

Filimonova, O.N., Tagirov, B.R., Trigub, A.L., Nickolsky, M.S., Rovezzi, M., Belogub, E.V., Reukov, V.L., and Vikentyev, I.V. (2020) The state of Au and As in pyrite studied by X-ray absorption spectroscopy of natural minerals and synthetic phases. Ore Geology Reviews, 121, 103475.10.1016/j.oregeorev.2020.103475Suche in Google Scholar

Fleet, M.E., and Mumin, A.H. (1997) Gold-bearing arsenian pyrite and marcasite and arsenopyrite from Carlin Trend gold deposits and laboratory synthesis. American Mineralogist, 82, 182–193.10.2138/am-1997-1-220Suche in Google Scholar

Fleet, M.E., MacLean, P.J., and Barbier, J. (1989) Oscillatory-zoned As-bearing pyrite from strata-bound and stratiform gold deposits: An indicator of ore fluid evolution. Economic Geology Monograph, 6, 356–362.Suche in Google Scholar

Fleet, M.E., Chryssoulis, S.L., MacLean, P.J., Davidson, R., and Weisener, C.G. (1993) Arsenian pyrite from gold deposits: Au and As distribution investigated by SIMS and EMP, and color staining and surface oxidation by XPS and LIMS. Canadian Mineralogist, 31, 1–17.Suche in Google Scholar

Gopon, P., Douglas, J.O., Auger, M.A., Hansen, L., Wade, J., Cline, J.S., Robb, L.J., and Moody, M.P. (2019) A nanoscale Investigation of Carlin-type gold deposits: An atom-scale elemental and isotopic perspective. Economic Geology, 114, 1123–1133.10.5382/econgeo.4676Suche in Google Scholar

Gordy, W. (1946) A relation between bond force constants, bond orders, bond lengths, and the electronegativities of the bonded atoms. The Journal of Chemical Physics, 14, 305–320.10.1063/1.1724138Suche in Google Scholar

Kang, T.T., Hashimoto, A., and Yamamoto, A. (2009) Raman scattering of indium-rich AlxIn1−xN: Unexpected two-mode behavior of A1 (LO). Physical Review B, 79, 033301.10.1103/PhysRevB.79.033301Suche in Google Scholar

Kesler, S.E., Deditius, A.P., Reich, M., Utsunomiya, S., and Ewing, R.C. (2011) Role of arsenian pyrite in hydrothermal ore deposits: A history and update. Geological Society of Nevada Symposium, May 14–22.Suche in Google Scholar

Kharbish, S., Libowitzky, E., and Beran, A. (2007) The effect of As–Sb substitution in the Raman spectra of tetrahedrite-tennantite and pyrargyrite-proustite solid solutions. European Journal of Mineralogy, 19, 567–574.10.1127/0935-1221/2007/0019-1737Suche in Google Scholar

Kleppe, A.K., and Jephcoat, A.P. (2004) High-pressure Raman spectroscopic studies of FeS2 pyrite. Mineralogical Magazine, 68, 433–441.10.1180/0026461046830196Suche in Google Scholar

Kumar, R., Mavi, H. S., and Shukla, A.K. (2010) Spectroscopic investigation of quantum confinement effects in ion implanted silicon-on-sapphire films. Silicon, 2, 25–31.10.1007/s12633-009-9033-zSuche in Google Scholar

Kumar, R., Sahu, G., Saxena, S.K., Rai, H.M., and Sagdeo, P.R. (2014) Qualitative evolution of asymmetric Raman line-shape for nanostructures. Silicon, 6, 117–121.10.1007/s12633-013-9176-9Suche in Google Scholar

Large, R.R., Halpin, J.A., Danyushevsky, L.V., Maslennikov, V.V., Bull, S.W., Long, J.A., Gregory, D.D., Lounejeva, E., Lyons, T.W., Sack, P.J., McGoldrick, P.J., and Calver, C.R. (2014) Trace element content of sedimentary pyrite as a new proxy for deep-time ocean-atmosphere evolution. Earth and Planetary Science Letters, 389, 209–220.10.1016/j.epsl.2013.12.020Suche in Google Scholar

Li, S.N., Ni, P., Bao, T., Li, C.Z., Xiang, H.L., Wang, G.G., Huang, B., Chi, Z., Dai, B.Z., and Ding, J.Y. (2018) Geology, fluid inclusion, and stable isotope systematics of the Dongyang epithermal gold deposit, Fujian Province, southeast China: Implications for ore genesis and mineral exploration. Journal of Geochemical Exploration, 195, 16–30.10.1016/j.gexplo.2018.02.009Suche in Google Scholar

Liang, J.L., Sun, W.D., Li, Y.L., Zhu, S.Y., Li, H., Liu, Y.L., and Zhai, W. (2013) An XPS study on the valence states of arsenic in arsenian pyrite: implications for Au deposition mechanism of the Yang-shan Carlin-type gold deposit, western Qinling belt. Journal of Asian Earth Sciences, 62, 363–372.10.1016/j.jseaes.2012.10.020Suche in Google Scholar

Lutz, H.D., and Zwinscher, J. (1996) Lattice dynamics of pyrite FeS2-polarizable-ion model. Physics and Chemistry of Minerals, 23, 497–502.10.1007/BF00241999Suche in Google Scholar

Manceau, A., Merkulova, M., Mathon, O., Glatzel, P., Murdzek, M., Batanova, V., Simionovici, A., Steinmann, S.N., and Paktunc, D. (2020) The mode of incorporation of As (-I) and Se (-I) in natural pyrite revisited. ACS Earth and Space Chemistry, 4, 379–390.10.1021/acsearthspacechem.9b00301Suche in Google Scholar

Merkulova, M., Mathon, O., Glatzel, P., Rovezzi, M., Batanova, V., Marion, P., Boiron, M.C., and Manceau, A. (2019) Revealing the chemical form of “invisible” gold in natural arsenian pyrite and arsenopyrite with high energy-resolution X-ray absorption spectroscopy. ACS Earth and Space Chemistry, 3, 1905–1914.10.1021/acsearthspacechem.9b00099Suche in Google Scholar

Mernagh, T.P., and Trudu, A.G. (1993) A laser Raman microprobe study of some geologically important sulphide minerals. Chemical Geology, 103, 113–127.10.1016/0009-2541(93)90295-TSuche in Google Scholar

Morishita, Y., Shimada, N., and Shimada, K. (2018) Invisible gold in arsenian pyrite from the high-grade Hishikari gold deposit, Japan: Significance of variation and distribution of Au/As ratios in pyrite. Ore Geology Reviews, 95, 79–93.10.1016/j.oregeorev.2018.02.029Suche in Google Scholar

Osadchii, E.G., and Gorbaty, Y.E. (2010) Raman spectra and unit cell parameters of sphalerite solid solutions (FexZn1−xS). Geochimica et Cosmochimica Acta, 74, 568–573.10.1016/j.gca.2009.10.022Suche in Google Scholar

Pačevski, A., Libowitzky, E., Zîvkovič, P., Dimitrijevič, R., and Cvetkovič, L. (2008) Copper-bearing pyrite from the Coka Marin polymetallic deposit, Serbia: Mineral inclusions or true solid-solution? Canadian Mineralogist, 46, 249–261.10.3749/canmin.46.1.249Suche in Google Scholar

Palenik, C.S., Utsunomiya, S., Reich, M., Kesler, S.E., Wang, L.M., and Ewing, R.C. (2004) Invisible. gold revealed: Direct imaging of gold nanoparticles in a Carlin-type deposit. American Mineralogist, 89, 1359–1366.10.2138/am-2004-1002Suche in Google Scholar

Peterson, D.L., Petrou, A., Giriat, W., Ramdas, A.K., and Rodriguez, S. (1986) Raman scattering from the vibrational modes in Zn1−xMnxTe. Physical Review B, Condensed Matter, 33, 1160–1165.10.1103/PhysRevB.33.1160Suche in Google Scholar PubMed

Pring, A., Tarantino, S.C., Tenailleau, C., Etschmann, B., Carpenter, M.A., Zhang, M., Liu, Y., and Withers, R.L. (2008) The crystal chemistry of Fe-bearing sphalerites: an infrared spectroscopic study. American Mineralogist, 93, 591–597.10.2138/am.2008.2610Suche in Google Scholar

Qian, G.J., Brugger, J., Testemale, D., Skinner, W., and Pring, A. (2013) Formation of As(II)-pyrite during experimental replacement of magnetite under hydrothermal conditions. Geochimica et Cosmochimica Acta, 100, 1–10.10.1016/j.gca.2012.09.034Suche in Google Scholar

Reich, M., and Becker, U. (2006) First-principles calculations of the thermodynamic mixing properties of arsenic incorporation into pyrite and marcasite. Chemical Geology, 225, 278–290.10.1016/j.chemgeo.2005.08.021Suche in Google Scholar

Reich, M., Kesler, S.E., Utsunomiya, S., Palenik, C.S., Chryssoulis, S.L., and Ewing, R.C. (2005) Solubility of gold in arsenian pyrite. Geochimica et Cosmochimica Acta, 69, 2781–2796.10.1016/j.gca.2005.01.011Suche in Google Scholar

Reich, M., Deditius, A., Chryssoulis, S., Li, J.W., Ma, C.Q., Parada, M.A., Barra, F., and Mittermayr, F. (2013) Pyrite as a record of hydrothermal fluid evolution in a porphyry copper system: A SIMS/EMPA trace element study. Geochimica et Cosmochimica Acta, 104, 42–62.10.1016/j.gca.2012.11.006Suche in Google Scholar

Savage, K.S., Tingle, T.N., O’Day, P.A., Waychunas, G.A., and Bird, D.K. (2000) Arsenic speciation in pyrite and secondary weathering phases, Mother Lode gold district, Tuolumne County, California. Applied Geochemistry, 15, 1219–1244.10.1016/S0883-2927(99)00115-8Suche in Google Scholar

Simon, G., Huang, H., Penner-Hahn, J.E., Kesler, S.E., and Kao, L.S. (1999a) Oxidation state of gold and arsenic in gold-bearing arsenian pyrite. American Mineralogist, 84, 1071–1079.10.2138/am-1999-7-809Suche in Google Scholar

Simon, G., Kesler, S.E., and Chryssoulis, S. (1999b) Geochemistry and textures of gold-bearing arsenian pyrite, Twin Creeks, Nevada: implications for deposition of gold in Carlin-type deposits. Economic Geology, 94, 405–421.10.2113/gsecongeo.94.3.405Suche in Google Scholar

Smith, J.E., Brodsky, M.H., Crowder, B.L., Nathan, M.I., and Pinczuk, A. (1971) Raman spectra of amorphous Si and related tetrahedrally bonded semiconductors. Physical Review Letters, 26, 642–646.10.1103/PhysRevLett.26.642Suche in Google Scholar

Sourisseau, C., Cavagnat, R., and Fouassier, M. (1991) The vibrational properties and valence force fields of FeS2, RuS2 pyrites and FeS2 marcasite. Journal of Physics and Chemistry of Solids, 52, 537–544.10.1016/0022-3697(91)90188-6Suche in Google Scholar

Spycher, N.F., and Reed, M.H. (1989) As(III) and Sb(III) sulfide complexes: an evaluation of stoichiometry and stability from existing experimental data. Geochimica et Cosmochimica Acta, 53, 2185–2194.10.1016/0016-7037(89)90342-6Suche in Google Scholar

Stingl, T., Müller, B., and Lutz, H.D. (1992) Pyrite-type RuS2−2xSe2x and Ru1−xOsxS2 solid solutions: X-ray structure determination and Raman spectra. Journal of Alloys and Compounds, 184, 275–284.10.1016/0925-8388(92)90501-YSuche in Google Scholar

Temple, P.A., and Hathaway, C.E. (1973) Multiphonon Raman spectrum of silicon. Physical Review B, 7, 3685–3697.10.1103/PhysRevB.7.3685Suche in Google Scholar

Twardowski, A., Swagten, H.J.M., Wetering, T., and de Jonge, W.J.M. (1988) Thermodynamic properties of iron-based II–VI semimagnetic semiconductors. Solid State Communications, 65, 235–239.10.1016/0038-1098(88)90777-6Suche in Google Scholar

Ushioda, S. (1972) Raman scattering from phonons in iron pyrite (FeS2). Solid State Communications, 10, 307–310.10.1016/0038-1098(72)90013-0Suche in Google Scholar

Vaughan, D. J., and Craig, J.R. (1978) Mineral Chemistry of Metal Sulphides. Cambridge University Press, pp 493.Suche in Google Scholar

Vogt, H., Chattopadhyay, T., and Stolz, H.J. (1983) Complete first-order Raman spectra of the pyrite structure compounds FeS2, MnS2 and SiP2. Journal of Physics and Chemistry of Solids, 44, 869–873.10.1016/0022-3697(83)90124-5Suche in Google Scholar

Xu, N., Li, S.R., Santosh, M., and Tong, B. (2018) Petrology, geochemistry and zircon U–Pb geochronology of the Jurassic porphyry dykes in the Dehua gold field, Southeast China: genesis and geodynamics. Geological Journal, 53, 547–564.10.1002/gj.2912Suche in Google Scholar

Xu, N., Li, S.R., Wu, C.L., and Santosh, M. (2019) Geochemistry and geochronology of the Dongyang gold deposit in southeast China: Constraints on ore genesis. Geological Journal, 55, 425–438.10.1002/gj.3421Suche in Google Scholar

Yang, M., Huang, D., Hao, P., Zhang, F., Hou, X., and Wang, X. (1994) Study of the Raman peak shift and the linewidth of light-emitting porous silicon. Journal of Applied Physics, 75, 651–653.10.1063/1.355808Suche in Google Scholar

Zhang, H., Cai, Y.F., Zhang, Y., Ni, P., Li, S.N., Ding, J.Y., Pan, Y.G., and Bao, T. (2018) Mineralogical characteristics of silver minerals from the Dongyang Gold deposit, China: Implications for the evolution of epithermal metallogenesis. Journal of Geochemical Exploration, 195, 143–156.10.1016/j.gexplo.2018.06.004Suche in Google Scholar

Zhang, H., Cai, Y.F., Gang, S., Brugger, J., Pring, A., Ni, P., Qian, G.J., Luo, Z.J., Zhang, Y., and Tan, W. (2022) Effects of arsenic on the distribution and mode of occurrence of gold during fluid–pyrite interaction: a case study of pyrite from the Qiucun gold deposit, China. American Mineralogist, 107, in press.10.2138/am-2021-7675Suche in Google Scholar

Zhu, Q.Q., Cook, N.J., Xie, G.Q., Wade, B.P., and Ciobanu, C.L. (2020) Arsenic-induced downshift of Raman band positions for pyrite. Economic Geology, 115, 1589–1600.10.5382/econgeo.4770Suche in Google Scholar
Received: 2020-09-13
Accepted: 2021-02-06
Published Online: 2022-01-26
Published in Print: 2022-02-23

© 2022 Mineralogical Society of America

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https://doi.org/10.2138/am-2021-7806
Schlagwörter für diesen Artikel
Arsenian pyrite; Raman spectroscopy; solid solution; structural defect

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