A Herman Ottó Múzeum évkönyve 50. (2011)

TERMÉSZETTUDOMÁNY - SZAKÁLL Sándor-KRISTÁLY Ferenc-ZAJZON Norbert-NÉMETH Norbert-FEHÉR Béla Másodlagos foszfátok és szulfátok a diósgyőri Fényeskő-völgy kovásodott metariolitjában

46 Szakáll et al. Bükk Mountains, NE Hungary. Acta Geologica Hungarica 1-3, 67-83. ÁRKAI Péter-BALOGH Kadosa-DUNKL István 1995 Timing of low temperature meta­morphism and cooling of the Paleozoic and Mesozoic formations of the Bükkium, innermost Western Carpathians, Hungary. Geologische Rundschau 84/2, 334-344. ÁRVÁNÉ SÓS Erzsébet-BALOGH Kadosa­RAVASZNÉ BARANYAI Lívia-RAVASZ Csaba 1987 Mezozóos magmás kőzetek K/Ar kora Magyarország egyes területein. In A Magyar Állami Földtani Intézet Evi Jelentése 1985-ről. 295-307. BALOGH Kálmán 1964 A Bükkhegység földtani képződményei. Magyar Állami Földtani Intézet Evkönyve 2, 245-553. DUTRIZAC, John E.-CHEN, Tzong T. 2010 The behaviour of phosphate during jarosite precipitation. Hydrometallurgy 120/1­4, 55-56. KUNOV, Angel 1996 Cacoxenite, corkite, hinsdalite and plum­bogummite in the Chala deposit, Eastern Rhodopes. Geochemistry - Mineralogy ­Petrology 31, 61-64. LESS György-KOVÁCS Sándor-PELIKÁN Pál­PENTELÉNYI László-SÁSDI László 2005 A Bükk hegység földtana. Magyarázó a Bükk hegység földtani térképéhez (1:50000). Magyar Állami Földtani Intézet, Budapest. NRIAGU, Jerome O. 1984 Formation and stability of base metal phosphates in soils and sediments. In NRIAGU, Jerome O.-MOORE, Paul B. (eds.): Phosphate minerals. Springer Verlag, Berlin­Heidelberg-New York-Tokyo. 318-329. SZOLDÁN Zsolt 1990 Middle Triassic magmatic sequences from different tectonic settings in the Bükk Mts. NE Hungary. Acta Mineralogica­Petrographica 31, 25-42. VAN WAMBEKE, L. 1971 Hinsdalite and corkite: indicator mine­rals in Central Africa. Mineralium Deposita 6/2, 130-132. SECONDARY PHOSPHATES AND SULPHATES IN THE SILICIFIED METARHYOLITE AT THE FÉNYESKŐ VALLEY, DIÓSGYŐR, BÜKK MTS., HUNGARY Keywords: phosphates, sulphates, corkite, phosphosiderite, cacoxenite, jarosite, plumbojarosite A paragenesis rich in secondary phosphates and sulphates was found in the silicified-albitized metarhyolite of the Fényeskő Valley in Diósgyőr, Bükk Mts., Hungary. The original sulphide-rich asso­ciation was an adularia-sericite alteration of epithermal origin with sulphides (mainly galena, sphalerite, pyrite) and abundant rutile. Subsurface weathering caused secondary sulphate and phosphate minerali­zation in the strongly fractured zones of the rock. After the dissolution of the sulphides and rock­forming minerals the secondary mineralization started with jarosite. It was followed by the formation of Pb and P containing jarosite and sometimes plumbojarosite. The phosphate content of the fluids was increasing with time, incorporating into the jarosite. Parallel to this, the potassium content was reduced, while lead was increased in the jarosite. When the acidic environment, which was created by the altera­tion of sulphides, changed firstly to neutral, then basic, the fluids became saturated with phosphate and phosphates started to precipitate. The following mineralization sequence was found in this episode: PbFe phosphate-sulphate (corkite), PbAlFe phosphates (plumbogummite?; phosphosiderite; strengite?), and as the final product an FeAl-phosphate, the cacoxenite was found in the strongly weathered Fe oxide rich zones. This is the first documentation of corkite and phosphosiderite in the Carpathian region. Further mineralogical and geochemical investigations are needed to clarify, whether the primary po­lymetallic sulphide ore mineralization contains gold or not. Sándor Szakáll-Ferenc Kristály-Norbert Zajzon-Norbert Németh-Béla Fehér

Next

/
  • Layout
  • Zoom
  • Rotation
Thumbnails
Contents