ZPRÁVA O VÝZKUMU SN-BOHATÉ MINERÁLNÍ ASOCIACE S AS-VESUVIANEM V NEDVĚDICKÉM MRAMORU U KOZLOVA NA ZÁPADNÍ MORAVĚ, SVRATECKÉ KRYSTALINIKUM
Vol.16,(2009)
Insignificant skarn-like rock was discovered in Nedvědice marble near Kozlov (near Štěpánov nad Svratkou, Svratka Crystalline Complex). It contains distinctive Sn-, As- rich mineral assemblage comprising largely green Sn-bearing andradite with sporadic grossularite relics, As-bearing vesuvianite, malayaite and also As-bearing fluorapatite, nordenskiöldine and cassiterite as accessories. Two main stages of development of the mineral assemblage were distinguished. The first, relatively HT stages, producing tin-bearing andradite (1.2–2.4 wt. % SnO2), malayaite and arsenic-bearing vesuvianite (≤1.97 wt. % As2O5). In the retrograde alteration stage stokesite, „hydrocassiterite“ and unidentifi ed Ca-Fe-arsenates replaced of minerals of the first stage. Primary iron-rich assemblage crystallised under oxidic conditions especially enriched in Sn, As and B, highly various in Si activity and CO2 fugacity.
malayaite; andradite; vesuvianite; fluorapatite; electron microprobe analyses; tin; arsenic; Nedvědice Marble; Svratka Crystalline Complex
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