Genesis of secondary Mn-oxide ores in the Úrkút deposit, Hungary: An oxygen isotope study

Gy Pantó, A. Demény, M. Polgári

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The Úrkút Basin of western Hungary is well known for its early Jurassic Mn-carbonate deposit that is related genetically to Jurassic black shale formation. This carbonate deposit has undergone multistage oxidation during the Cretaceous that produced secondary Mn-oxides. Among the geochemical characteristics that distinguish the host sedimentary rocks and Mn-carbonates from the Mn-oxides is an extreme enrichment in Sr (up to 1%) without an observable independent Sr-phase. This enrichment indicates a special process of formation. The δ18O values of these Mn-oxide ores fall between 1.5 and 5.5‰ (VSMOW) showing a slight bimodal distribution. This isotopic variability is interpreted as a product of superposing effects of the interaction of surficial and deepseated magmatic fluids. The δ18OMnO2 values (from 1.5 to 5.5‰), the assumed δ18Owater values and formation temperatures fit well with the MnO2-water fractionation curve based on the data of Yeh et al. (1985) and Hoefs et al. (1987).

Original languageEnglish
Pages (from-to)238-241
Number of pages4
JournalMineralium Deposita
Volume31
Issue number3
DOIs
Publication statusPublished - Mar 1996

ASJC Scopus subject areas

  • Geophysics
  • Geochemistry and Petrology
  • Economic Geology

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