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Ocmulgee Fault; the Piedmont-Avalon terrane boundary in central Georgia

Robert J. Hooper and Robert D. Hatcher
Ocmulgee Fault; the Piedmont-Avalon terrane boundary in central Georgia
Geology (Boulder) (August 1990) 18 (8): 708-711


The Ocmulgee fault is a fundamental boundary within the Piedmont of central Georgia separating North American, Piedmont terrane rocks from exotic rocks of the Avalon (Carolina) terrane. Contrasts in stratigraphy, metamorphic grade, and aeromagnetic signature coincide with the fault trace. The fault comprises a broad zone (ca. 2 km) of foliation dipping steeply southeast and containing localized syn- and post-thermal-peak right-lateral strike-slip shear zones. Oblique dextral convergence between the Avalon and Piedmont terranes, most likely around 350 Ma, produced the steep zone and its attendant dextral shear zones. Steep foliation within the fault zone resulted in its predisposition to later faulting.

ISSN: 0091-7613
EISSN: 1943-2682
Serial Title: Geology (Boulder)
Serial Volume: 18
Serial Issue: 8
Title: Ocmulgee Fault; the Piedmont-Avalon terrane boundary in central Georgia
Affiliation: Univ. South Fla., Dep. Geol., Tampa, FL, United States
Pages: 708-711
Published: 199008
Text Language: English
Publisher: Geological Society of America (GSA), Boulder, CO, United States
References: 13
Accession Number: 1990-050100
Categories: Structural geology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: sects., geol. sketch map
N32°55'00" - N33°12'00", W84°13'60" - W84°01'60"
N32°30'00" - N33°19'60", W85°19'60" - W83°45'00"
N32°52'00" - N33°12'00", W84°04'60" - W83°40'60"
N32°45'00" - N33°00'00", W84°30'00" - W84°04'60"
N33°07'60" - N33°32'60", W83°50'60" - W83°31'60"
Secondary Affiliation: Univ. Tenn., USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 1990
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