Tectonic Studies in the Talladega and Carolina Slate Belts, Southern Appalachian Orogen
Stratigraphy and structure of the central Talladega slate belt, Alabama Appalachians
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Published:January 01, 1982
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CiteCitation
Terry A. Cook, 1982. "Stratigraphy and structure of the central Talladega slate belt, Alabama Appalachians", Tectonic Studies in the Talladega and Carolina Slate Belts, Southern Appalachian Orogen, Denny N. Bearce, William W. Black, Stephen A. Kish, James F. Tull
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The Talladega slate belt in eastern Alabama represents a crystalline thrust sheet composed of low-grade metasediments. Three major lithologic sequences comprise the Talladega slate belt: (1) the Kahatchee Mountain Group, (2) the Sylacauga Marble Group, and (3) the Talladega Group. The contact relationships between the Sylacauga Marble Group and the Talladega Group indicate that the phyllites and slates of the Talladega Group rest unconformably on marbles of the Sylacauga Marble Group. Previous workers have identified specific stratigraphic sequences within the Talladega Group both in the north-central portion of the Talladega slate belt and in the southern portion of the belt. Little work has been carried out in the south-central portion of the Talladega slate belt, a region intermediate between areas to the northeast and southwest where the regional stratigraphy has been defined. To the northwest in Cleburne and Clay Counties, Alabama, the Talladega Group has been broken down into the Heflin Phyllite, the Able Gap Formation, and the Chulafinnee Schist. To the southwest in Chilton County, Alabama, similar units have been mapped as the Lay Dam Formation, the Butting Ram Sandstone, and the Jemison Chert. These units have not been mapped through this intermediate south-central region of the Talladega slate belt because of the absence by faulting of a major sandstone unit, the Cheaha Quartzite, which has been used for regional correlation. Another prominent unit, the Jemison Chert, which outcrops to the southeast of the Cheaha Quartzite, continues across this region and was used to correlate the regional stratigraphy from the northeast with that in the southwest. Detailed mapping has shown that a small slice of paper-thin quartzites of the Jemison Chert interval has overridden the Cheaha Quartzite. The geometric relationships between these two units, the differing petrologic character of these ridge-forming lithologies, the duplication of the Jemison Chert interval, and the emplacement of this imbricate slice of Jemison, in addition to structural fabric data, suggest that this termination of the Cheaha Quartzite is fault related.
- Alabama
- Appalachians
- Chilton County Alabama
- Clay County Alabama
- Cleburne County Alabama
- Coosa County Alabama
- correlation
- displacements
- faults
- foliation
- imbricate tectonics
- lineation
- metamorphic rocks
- North America
- Paleozoic
- stratigraphy
- structural geology
- Talladega County Alabama
- Talladega Front
- Talladega Group
- tectonics
- thrust faults
- United States
- Jemison Chert
- Cheaha Quartzite
- Lay Dam Formation
- Heflin Phyllite
- Chulafinnee Schist
- Butting Ram Formation
- Able Gap Formation