GEOLEX

Summary of Citation: Franklin

Publication:
Seal, T.L. and Kish, S.A., 1990, The geology of the Dadeville
   Complex of the western Georgia and eastern Alabama Inner
   Piedmont; initial petrographic, geochemical, and geochronological
   results , IN Steltenpohl, M.G., and others, eds., Geology of
   the southern Inner Piedmont, Alabama and southwest Georgia;
   Field trip no. 7: Geological Society of America, Southeastern
   Section, Guidebook for Field Trips, 39th Annual Meeting,
   Tuscaloosa, AL, April 5-6,1990, p. 65-77

Usage in Publication:
Franklin gneiss

Modifications:	Geologic Province:	Dominant Lithology:
Named	Piedmont-Blue Ridge province	Gneiss

Summary:
Largest intrusive body in the study area is a granitic gneiss, informally named the Franklin gneiss. Outcrops abundant in Heard Co., GA, near town of Franklin. Unit is a light-gray, medium- to coarse-grained gneiss with granoblastic to blastoporphyritic texture. Granite pluton of batholith scale is metamorphosed and deformed. Exceeds 135 sq mi in extent. Rb-Sr whole-rock age of 462+/-4 Ma (Middle Ordovician) on Franklin provides minimum age constraint on Dadeville Complex, which it intrudes.