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  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Tlenki manganu z diabazów Niedźwiedziej Góry koło Krakowa
    (Wydawnictwa AGH, 2009) Muszyński, Marek; Rzepa, Grzegorz; Skowroński, Andrzej
    Black manganese oxides from the polymineral veins found in 1998 in the so-called diabases of Niedźwiedzia Góra near Kraków have been identified (XRD, IR, DTA-TG, SEM/EDS, EPMA/WDS) as intermediate members of the rancieite-takanelite series. In comparison with the minerals of this series described in the literature, they reveal elevated contents of iron and barium and relatively low contents of calcium. In the probable succession of components of the veins mentioned, the Mn oxides occupy the before last position: goethite +/- saponite $\to$ <b>tension</b> $\to$ barite, thin prismatic-acicular quartz $\to$ <b>leaching</b> $\to$ Mn oxides, prismatic quartz. They must have crystallized from descensive waters associated with surface weathering of the diabases, which took place when overlaying Carboniferous rocks had been eroded. The weathering diabases were a probable source of manganese.