Hostname: page-component-76fb5796d-x4r87 Total loading time: 0 Render date: 2024-04-25T10:51:11.329Z Has data issue: false hasContentIssue false
  • English
  • Français

Arsenopyrite and As-bearing pyrite from the Roudný deposit, Bohemian Massif

Published online by Cambridge University Press:  05 July 2018

J. Zachariáš ,
J. Frýda ,
B. Paterová  and
M. Mihaljevič
J. Zachariáš*
Affiliation:
Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science, Charles University, Albertov, 6, 128 43, Prague 2, Czech Republic
J. Frýda
Affiliation:
Czech Geological Survey, Klárov 3, 118 21, Prague 1, Czech Republic
B. Paterová
Affiliation:
Czech Geological Survey, Klárov 3, 118 21, Prague 1, Czech Republic
M. Mihaljevič
Affiliation:
Institute of Geochemistry, Mineralogy and Mineral Resources, Faculty of Science, Charles University, Albertov, 6, 128 43, Prague 2, Czech Republic
*
*E-mail: zachar@natur.cuni.cz
Get access Rights & Permissions [Opens in a new window]

Abstract

The major- and trace-element chemistry of pyrite and arsenopyrite from the mesothermal Roudný gold deposits was studied by electron microprobe and laser ablation ICP-MS techniques. In total, four generations of pyrite and two of arsenopyrite were distinguished. The pyrite is enriched in As through an Fe (AsxS1–x)2 substitution mechanism. The As-rich zones of pyrite-2 (up to 4.5 wt.% As) are also enriched in gold (up to 20 ppm), lead (commonly up to 220 ppm, exceptionally up to 1500 ppm) and antimony (commonly <600 ppm, rarely up to 1350 ppm). Positive correlation of As and Au in the studied pyrites is not coupled with an Fe deficiency, in contrast to Au-rich As-bearing pyrites in Carlintype gold deposits. The As-rich pyrite-2 coprecipitated with the Sb-rich (1 –4.2 wt.%) and Au-rich (40 –150 ppm) arsenopyrite-1. The younger arsenopyrite-2 is significantly less enriched in these elements (0 –70 ppm of Au).

The chemical zonality of pyrites in the Roudný gold deposits reflects the chemical evolution of orebearing fluids that are not observed in any other mineral phases. The data available suggest relatively high activity of sulphur and low activities of arsenic and gold during crystallization of the older pyrite generation (pyrite-1). Later, after particular dissolution of pyrite-1, Au-rich As-bearing pyrite-2 and arsenopyrite precipitated. These facts suggest a marked increase in the arsenic and gold activities in ore-bearing fluids. The As-content of pyrite-2 decreases in an oscillatory manner from the core to the rim, reflecting changes in the As activity or/and in the P-T conditions. The As-bearing pyrites were formed at temperatures of at least 320–330°C, based on arsenopyrite thermometers and fluid inclusion data.

Keywords

arsenicpyriteinvisible goldmesothermal gold depositsLA-ICP-MS
Type
Research Article
Information
Mineralogical Magazine , Volume 68 , Issue 1 , February 2004 , pp. 31 - 46
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2004

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Asif, M. and Parry, S.J. (1989) Elimination of reagent blank problems in the. re-assay pre-concentration of the platinum group elements and gold with a nickel sulphide bead of less than one gram mass. Analyst, 114, 1057–1059.CrossRefGoogle Scholar
Bernard, J.H. (1967) Minerogenetische Subprovinzen und Zeitenheiten von Hydrothermaliten des tschechoslowakischen Teil der Böhmischen Masse. Vístník Ústrfedního Ústavu geologického, Prague, 42, 263–273.Google Scholar
Boiron, M.C., Barakat, A., Cathelineau, M., Banks, D.A., Durisova, J. and Moravek, P. (2001) Geometry and P-V-T-X conditions of micro. ssural ore fluid migration: the Mokrsko gold deposit (Bohemia). Chemical Geology, 173, 207–225.CrossRefGoogle Scholar
Bouchot, V., Milési, J.P., Lescuyer, J.L. and Ledru, P. (1997) Les minéralisations auriféres de la France dans leur cadre géologique autour de 300 Ma. Chronique de la Recherche Miniere, 528, 13–62.Google Scholar
Cabri, L.J. (1992) The distribution of trace precious metals in minerals and mineral products. Mineralogical Magazine, 56, 289–308.CrossRefGoogle Scholar
Chovan, M., Rojkovič, I., Andráš, P. and Hanas, P. (1992) Ore mineralization of the Malé Karpaty Mts. (Western Carpathians). Geologica Carpathica, 43, 275–286.Google Scholar
Clark, L.A. (1960) The Fe-As-S system: Phase relations and applicat ions. Economic Geology, 55, 1345–1381.CrossRefGoogle Scholar
Cook, N.J. and Chryssoulis, S.L. (1990) Concentrations of ‘invisible gold’ in the common sulphides. The Canadian Mineralogist, 28, 1–16.Google Scholar
Craig, J.R. and Vaughan, D.J. (1990) Compositional and textural variation of the major iron and base-metal sulphide minerals. Pp. 1–16 in: Sulphide Deposits– Their Origin and Processing (Gray, P.M.J. et al., editors). The Institute of Mining and Metallurgy, London.Google Scholar
Dodóny, I., Pósfai, M. and Buseck, P.R. (1996) Structural relationship between pyrite and marcasite. American Mineralogist, 81, 119–125.CrossRefGoogle Scholar
Fiala, J. (1995) General characte ristics of the Moldanubian Zone. Pp. 417–418 in: Pre-Permian Geology of Central and Eastern Europe (Dallmeyer, R.D., Franke, W. and Weber, K., editors). Springer-Verlag, Berlin Heidelberg.CrossRefGoogle Scholar
Fleet, M.E. and Mumin, A.H. (1997) Gold-bearing arsenian pyrite and marcasite from Carlin Trend deposits and laboratory synthesis. The American Mineralogist, 82, 182–193.CrossRefGoogle Scholar
Fleet, M.E., MacLean, P.J. and Barbier, J. (1989) Oscillatory-zoned As-bearing pyrite from stratabound and stratiform gold deposits: An indicator of ore fluid evolution. Economic Geology Monograph, 6, 356–362.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. The Canadian Mineralogist, 31, 1–17.Google Scholar
Genkin, A.D., Bortnikov, N.S., Cabri, L.J., Wagner, F.E., Stanley, C.J., Safonov, Y.G., McMahon, G., Friedl, J., Kerzin, A.L. and Gamyanin, G.N. (1998) A multidisciplinary study of invisible gold in arsenopyrite from four mesothermal gold deposits in Siberia, Russian Federation. Economic Geology, 93, 463–487.CrossRefGoogle Scholar
Holub, V. (2001) The occurrences of the Permocarboniferous sequences in the Blanice Furrow. Pp. 197–207 in: Geology and Deposits of Upper Paleozoic Limnic Basins of the Czech Republic(Pešek, J. et al., editors). Czech Geological Survey, Prague (in Czech).Google Scholar
Johan, Z., Marcoux, E. and Bonnemaison, M. (1989) Arsenopyrite aurifere: Mode de substitution de Au dans la structure de FeAsS. Academie de Sciences (Paris) Comptes Rendus, 308, 185–191.Google Scholar
Komõ´nek, E., Morkus, J., Drozen, J., Blüml, A., Horáková, M., Hájek, J. and Procházka, J. (1990) Roudný deposit – gold resources (Project report, in Czech): Jihlava, Geoindustria Jihlava, Czech Republic, 60 pp.Google Scholar
Košler, J., Kelley, S.P. and Vrána, S. (2001) 40Ar/39Ar hornblende dating of a microgranodiorite dyke: implications for early Permian extension in the Moldanubian Zone of the Bohemian Massif. Inter nat ional Journal of Earth Scie ces (Geologisches Rundschau), 90, 379–385.CrossRefGoogle Scholar
Kretschmar, U. and Scott, S.D. (1976) Phase relations involving arsenopyrite in system Fe-As-S and their application. The Canadian Mineralo gist, 14, 364–386.Google Scholar
Longerich, H.P., Jackson, S.E. and Günther, D. (1996) Laser ablation inductively coupled plasma mass spectrometric transient signal data acquisition and analyte concentration calculation. Journal of Analytical Atomic Spectrometry, 11, 899–904.CrossRefGoogle Scholar
Morávek, P. (1971) Ore-deposits structure and mineralization of the Jõ´lové gold-mining district (in Czech with extensive English summary). Journal of Geological Sciences: Economic Geology, Mineralogy, Prague, 13, 1–170.Google Scholar
Morávek, P. (1995a) The Mokrsko gold deposit. Third Biennial SGA Meeting (August 28–31, 1995, Prague, Czech Republic) Excursion Guide: Prague, Czech Geological Survey, pp. 33–62 (The guidebook was republished as: Morávek, P., editor (1996) Gold Deposits in Bohemia. Czech Geological Survey, Prague).Google Scholar
Morávek, P. (1995b) The Jílové gold deposit. Third Biennial SGA Meeting (August 28–31, 1995, Prague, Czech Republic) Excursion Guide: Prague, Czech Geological Survey, pp. 19–32 (The guidebook was republished as: Morávek, P., editor (1996) Gold deposits in Bohemia. Czech Geological Survey, Prague).Google Scholar
Morávek, P. and Pouba, Z. (1990) L’or dans la metallogenie du massif de Boheme. Mineralium Deposita, 25, S90–S98.CrossRefGoogle Scholar
Morávek, P., Janatka, J., Pertoldová, J., Straka, E., Ďurišová, J. and Pudilová, M. (1989) Mokrsko gold deposit–the largest gold deposit in the Bohemian Massif, Czechoslovak ia. Economi c Geology Monograph, 6, 252–259.Google Scholar
Novák, F. (1956) Mineralogy of the Roudný deposit –preliminary report. Unpublished report, Geofond of the Czech Republic, Prague (in Czech).Google Scholar
Paterová, B. (2001) Mineralogical and geochemical study of the Roudný near Vlasfim deposit. M.Sc. thesis, Institute of Geochemistry, Faculty of Science, Charles University, Prague, 85 pp (in Czech).Google Scholar
Pósfai, M. and Buseck, P.R. (1997) Modular structures in sulphides: Sphalerite/wurtzite-, pyrite/marcasiteand pyrrhotite-type minerals. Pp. 193–235 in: Modular Aspects of Minerals (Merlino, S., editor). EMU Notes in Mineralogy, Vol. 1, Eö tvös University Press, Budapest.Google Scholar
Sharp, Z.D., Essene, E.J. and Kelly, W.C. (1985) A reexamination of the arsenopyrite geothermometer: Pressure considerations and applications to natural assemblages. The Canadian Mineralogist, 23, 517–534.Google Scholar
Simon, G., Kesler, S.E. and Chryssoulis, S. (1999) Geochemistry and textures of gold-bearing arsenian pyrite, Twin Creeks, Nevada: Implications for deposit ion of gold in Carlin- type deposit s. Econonic Geology, 94, 405–421.CrossRefGoogle Scholar
Slavík, F. (1912) Roudný. Sborník klubu Přfírodovìd, 1, 127–150. (in Czech).Google Scholar
Tauson, V.L. (1999) Gold solubility in the common gold-bearing minerals: Experimental evaluation and applic ation to pyrite. European Journal of Mineralogy, 11, 937–947.CrossRefGoogle Scholar
Zachariáš, J. and Stein, H. (2001) Re-Os ages of Variscan hydroth ermal gold minerali sations, Central Bohemian metallogenetic zone, Czech Republic. Pp. 851–854 in: Mineral Deposits at the Beginning of the 21st Century (Piestrzyński, A. et al., editors). Swets & Zeitlinger Publishers, Lisse, The Netherlands.Google Scholar
Zachariáš, J., Pudilová, M., Źák, K., Morávek, P., Litochleb, J., Váňa, T. and Pertold, Z. (1997) P-T conditions, fluid inclusions and O, C, S isotope characteristics of gold-bearing mineralizations within the Central Bohemian Metallogenic Zone. Acta Universitatis Carolinae – Geologica, Prague, 41, 167–178.Google Scholar
Zachariáš, J., Pudilova, M., Źák, K. and Janoušek, V. (2001) Multiple fluid sources of Au-mineralization: the Jí lové district, Bohemian Massif, Czech Republic. Pp. 855–859 in: Mineral Deposits at the Beginning of the 21st Century (Piestrzyński, A. et al., editors). Swets & Zeitlinger Publishers, Lisse, The Netherlands.Google Scholar