Upper Carboniferous basaltic lavas from Saint John, New Brunswick were metamorphosed under prehnite–pumpellyite conditions and some were also affected by extensive silicification. Silicification led to simple dilution of relatively immobile elements such as rare earths, Y, Zr, Hf, Th, and Sc. The chondrite-normalized REE patterns of the silicified rocks are parallel to those of basalts.

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