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Browsing by Subject "phosphate pegmatite"

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  • thumbnail.journal.alt
    Item type:Thesis, Access status: Restricted ,
    Wstępne dane na temat pegmatytu fosforanowego w Lutomii, blok sowiogórski
    (Data obrony: 2011-07-13) Włodek, Adam
    Wydział Geologii, Geofizyki i Ochrony Środowiska
    A phosphate pegmatite from Lutomia in Sowie Mts block represents a granite pegmatite that contains abundant phosphate mineralization. Electron microprobe analyses of the phosphates were used to initial recognition of the mineralization. Based on mineralogical variety, compositional variations and Mn-Fe geochemical fractionation in recognized phosphate minerals it is concluded that the minerals present in the Lutomia pegmatite had three different stages of their formation, confirmed by four different mineral parageneses. The successive stages can be characterized as (1) the crystallization of lamellar intergrowths of graftonite with ferrisicklerite and sarcopside (the paragenesis IA) or arrojadite, wyllieite and apatite (the paragenesis IB), representing the first generation of primary phosphates in the pegmatite; (2) the crystallization of allaudite – wolfeite/stanekite – Ca-beusite/Ca-graftonite and whitlockite in veinlets cutting the lamellar intergrowths, representing a second generation of the primary phosphates in the pegmatite; (3) a low temperature stage of alterations of the primary phosphates related to oxidation of iron and hydration, forming phosphoferrite, kryzhanovskite and ludlamite.