The Siloam granite crops out in the southern half of Greene County, Georgia, within the Outer Piedmont. The granite is similar to the coarsely porphyritic postmetamorphic granites of the Charlotte Belt of North Carolina and South Carolina. The Rb-Sr whole-rock date of the Siloam granite is 269 ± 3 m.y., making this intrusive the youngest of the southern Appalachian region. Its low initial 87Sr/86Sr ratio of 0.7052 ± 0.0001 suggests an upper mantle affinity with no appreciable crustal contamination during emplacement.

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