Fractionation of Rare Earth Elements in Greisen and Hydrothermal Veins Related to A-Type Magmatism

Figure 2

Representative vein (a–d) and greisen (e–h) specimens. (a) Photograph of sealed epidote-fluorite vein; (b) BSE image of epidote and chlorite lining a vein with calcite in the centre and in a veinlet penetrating into the wall rock; (c) photograph of a reactivated (presently open) vein with epidote closest to the wall rock and calcite precipitated after epidote; (d) photograph of a sealed epidote-calcite-fluorite vein; (e) BSE image of topaz intergrown with muscovite, fluorite, and quartz in greisen; (f) photograph of greisen containing epidote, biotite, and calcite; (g) photograph of fluorite-rich greisen with muscovite and quartz; (h) photograph of fluorite-poor greisen composed of quartz, muscovite, and low amounts of fluorite.

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