Abstract

Two monazite-bearing pegmatites near Culloden, Georgia, are described briefly. Both occupy NE-trending shears (thought to be part of the Goat Rock fault zone) in a complex series of schist and gneiss, apparently of volcanic origin, similar to the Carolina Slate belt and the Little River series. One quartz-potash feldspar pegmatite is an elongate, semiconcordant body trending N40 degrees E, containing occasional monazite crystals less than 1/4 in. across. In a second pegmatite, larger monazite crystals locally cut the foliation. The origin of the pegmatites is uncertain. They were probably injected after development of the shear zones during or after Permian time, and may be derived from nearby granites. Extensive radiometric highs in this part of the state indicate that other pegmatites probably exist.

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