Rare hydrated Mg-carbonate-hydroxide assemblage of serpentinite fissures in Hrubice, western Moravia (Czech Republic): a genetic model of its formation
Losos, Zdeněk; Kovář, Ondřej; Houzar, Stanislav; Zeman, Josef
published: Apr 1, 2013
ArtNo. ESP154019003002, Price: 29.00 €
Low-temperature fissure hydrated Mg-(Fe-)carbonate-hydroxide mineralization was found in the Hrubšice serpentinite body, Moravian Moldanubicum. It is formed by rare minerals (hydromagnesite, artinite, brugnatellite, coalingite), followed by aragonite, brucite, dolomite and calcite. Two main stages of crystallization have been recognised. The old stage of mineralization was relatively Fe-rich, with brugnatellite, coalingite and Fe-bearing brucite. The younger, more extensive Mg-rich stage, produced artinite and various morphological types of hydromagnesite. The youngest minerals of fissures are calcite, dolomite and aragonite. Mineral assemblages have formed from low-temperature solutions, which were enriched in Mg2+, at pH ∼ 9, with relatively low Al activity, low fugacity of CO2 and temperature lower than 44 °C.