Microbially mediated iron ore formation, Silicic Superunit, Rudabánya, Hungary
| Autor: | Sarolta Bodor, Ildikó Szentpétery, Márta Polgári, János Földessy |
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| Rok vydání: | 2016 |
| Předmět: |
Mineralization (geology)
Geochemistry Silicic Geology engineering.material 010502 geochemistry & geophysics 010403 inorganic & nuclear chemistry 01 natural sciences 0104 chemical sciences Diagenesis chemistry.chemical_compound Siderite chemistry Iron ore Geochemistry and Petrology Marl engineering Carbonate Economic Geology Metasomatism 0105 earth and related environmental sciences |
| Zdroj: | Ore Geology Reviews. 72:391-401 |
| ISSN: | 0169-1368 |
| DOI: | 10.1016/j.oregeorev.2015.08.005 |
| Popis: | The mineralogical, petrological, geochemical and textural characterization of the Triassic Bodvaszilas Sandstone in the Rudabanya open pit and Aggtelek Mts. is summarized based on our investigations. The pore-filling carbonate cement in the Lower Triassic Bodvaszilas Sandstone Formation of a proximal basin series (Rudabanya) was formed as the result of syngenetic and early diagenetic two step microbially mediated Fe mineralization (Fe-oxide formation by chemo-lithoautotrophic Fe-oxidizing microbes (FeOB) in a suboxic neutrophylic environment, and Fe-carbonate by heterotrophic microbes in a suboxic to anaerobic environment based on mineralized microbially produced textural evidences). The carbonate in the higher parts of the formation (transition between the Bodvaszilas Sandstone and the overlying formation, Szin Marl) was formed by the same metasomatic processes that produced the siderite ore in the Middle Triassic limestones and dolomites. These processes led to partial or complete Fe replacement of the syngenetic carbonate layers. Microbially mediated Fe enrichment also occurred at distal basin position in the Bodvaszilas Sandstone (Aggtelek Mts.). The formation later underwent deep burial diagenesis. |
| Databáze: | OpenAIRE |
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