| State | Alabama |
|---|---|
| Name | Dadeville Complex; Mafic and ultramafic rock |
| Geologic age | Precambrian to Paleozoic |
| Lithologic constituents |
Major
Igneous > Plutonic > Ultramafic > Pyroxeniteultramafic rock including enstatite pyroxenite
Minor
Metamorphic > Metaigneous > Metaintrusive > Metagabbrometanorite; metagabbro
Metamorphic > Amphibolite (Amphibolite)layered actinolite-tremolite amphibolite altered locally to serpentine, anthophyllite, and talc; and massive amphibolite.
Incidental
Igneous > Plutonic > Ultramafic > Hornblenditehornblendite; garnet-hornblendite
|
| Comments | from the USGS Geologic Names lexicon (ref. AL002): Dadeville Complex intruded by the informally named Franklin gneiss, a metamorphosed and deformed batholith-scale granite pluton with abundant outcrops in Heard Co., west-central GA. An Rb-Sr whole rock age of 462+/-4 Ma (Middle Ordovician) on the Franklin provides a minimum age constraint for Dadeville rocks. |
| References | Szabo, M.W., Osborne, E.W., Copeland, C.W. Jr., and Neathery, T.L., 1988, Geologic Map of Alabama, Geological Survey of Alabama Special Map 220, scale 1:250,000.USGS Geologic Names lexicon found at: http://ngmdb.usgs.gov/Geolex/https://ngmdb.usgs.gov/Geolex/search |
| NGMDB product | |
| Counties | Chambers - Tallapoosa |