August 8, 1993 Aiken, South Carolina Earthquake

Stevenson, D.A.; Talwani, Pradeep

doi:10.1785/gssrl.67.3.43

Seismological Research Letters

1996

DOI: 10.1785/gssrl.67.3.43

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August 8, 1993 Aiken, South Carolina Earthquake

D.A. Stevenson

Pradeep Talwani

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“…preted to show the presence of a Triassic-Jurassic mafic igneous complex in the subsurface (e.g., Petty et al, 1965;Daniels, 1974;Stevenson and Talwani, 1996), but limited core data from this area (from the C-10 well) show that much of this basement is similar to that found in the Pen Branch Metaigneous Complex.…”

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confidence: 98%

Petrology and geochemistry of Neoproterozoic volcanic arc terranes beneath the Atlantic Coastal Plain, Savannah River Site, South Carolina

Dennis

Shervais

Mauldin

et al. 2004

Geo. Society Am. Bull.

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The Piedmont of South Carolina and Georgia is a complex mosaic of exotic terranes of uncertain provenance. Farther south and east, these terranes form the basement beneath several kilometers of Cretaceous and Cenozoic sedimentary rocks, commonly referred to as the Atlantic Coastal Plain. The distribution and geologic history of this hidden crystalline basement can be inferred only on the basis of limited exposures at the margins of the Coastal Plain onlap, aeromagnetic lineaments that define basement trends in the subsurface, and core data from wells that penetrate basement. During the past 40 years, basement cores aggregating more than 6 miles (10,000 m) have been recovered from 57 deep wells at the Department of Energy's Savannah River Site. These cores provide the only known samples of basement terranes that lie southeast of the Fall Line in central South Carolina. Cores from the 57 deep wells, along with structural trends defined by aeromagnetic lineaments, allow us to define four distinct units within the basement beneath the Coastal Plain: (1) the Crackerneck Metavolcanic Complex (greenstones and felsic

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mentioning

confidence: 98%

Petrology and geochemistry of Neoproterozoic volcanic arc terranes beneath the Atlantic Coastal Plain, Savannah River Site, South Carolina

Dennis

Shervais

Mauldin

et al. 2004

Geo. Society Am. Bull.

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Structural inheritance in Carolinia, external to the excised Rheic Suture: Savannah River Site, South Carolina, USA.

Dennis

Shervais

Maher

2023

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Phanerozoic reactivations of basement fault zones are documented in 5000m of basement core recovered from beneath the updip Atlantic Coastal Plain underlying the U.S. Department of Energy Savannah River Site. These basement fault zones are adjacent to the excised Rheic Ocean suture. C. 619 and 624 Ma metaintrusive rocks contain a mylonitic fabric and intrude foliated mafic metavolcanic rocks. At c. 305 Ma, granulite facies orthogneisses were thrust over amphibolite facies metaigneous rocks in the transpressive Tinker Creek nappe. The overturned limb of the nappe localizes the Dunbarton Triassic basin border fault. The border fault acted as a conduit for fluids in the Mesozoic and Cenozoic. C. 220±5 Ma, a potassium and silica metasomatic event affected SRS basement. A propylitic event flushed reducing fluids through rocks as young as Santonian. The remains of a Triassic subbasin were identified in the northwest part of the site. A Cretaceous and younger vein paragenesis overprints the previous events. More than thirty pseudotachylytes are found in SRS basement and are preferentially localized on metasomatized Alleghanian chloritic fractures. Pseudotachylyte post-dates mineralized fractures. The Pen Branch fault offsets the basement-Cretaceous unconformity and is present in c. 242 m of core between PBF-7-419 m and PBF-7-660.8 m. The Pen Branch Fault cross-cuts mineralized fractures and must postdate strike-normal zeolites.

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2001-2002 Upper Three Runs Sequence of Earthquakes at the Savannah River Site, South Carolina

Stevenson

Talwani

2004

Seismological Research Letters

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August 8, 1993 Aiken, South Carolina Earthquake

Cited by 3 publications

References 0 publications

Petrology and geochemistry of Neoproterozoic volcanic arc terranes beneath the Atlantic Coastal Plain, Savannah River Site, South Carolina

Petrology and geochemistry of Neoproterozoic volcanic arc terranes beneath the Atlantic Coastal Plain, Savannah River Site, South Carolina

Structural inheritance in Carolinia, external to the excised Rheic Suture: Savannah River Site, South Carolina, USA.

2001-2002 Upper Three Runs Sequence of Earthquakes at the Savannah River Site, South Carolina

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