The Geology of the Carolinas

The Geology of the Carolinas
Author: J. Wright Horton
Publisher: Univ. of Tennessee Press
Total Pages: 432
Release: 1991
Genre: Science
ISBN: 9780870496622
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To celebrate its fiftieth anniversary, the Carolina Geological Society invited forty-three authors to contribute to the creation of The Geology of the Carolinas. The only comprehensive, modern treatment of the subject, the volume has been prepared for a diverse readership ranging from undergraduate students to specialists in the fields of geology and related earth sciences. Following the editors' general introduction are chapters on Precambrian and Paleozoic metamorphic and igneous rocks of the Appalachian Blue Ridge and Piedmont; rocks of early Mesozoic rift basins, formed just before the opening of the Atlantic Ocean; Cretaceous and Tertiary sedimentary deposits of the Atlantic Coastal Plain; Quaternary geology and geomorphology; Cenozoic tectonism, including evidence for the recurrence of large earthquakes near Charleston; and an overview of mineral resources in the Carolinas. The book includes an index of field guides produced by the society and a thorough bibliography. By introducing exciting new concepts and focusing on challenging problems on the frontiers of research, this authoritative book will stimulate research in the years to come. The Editors: J. Wright Horton, Jr., is a research geologist for the United States Geological Survey in Reston, Virginia. Victor A. Zullo is a professor of geology at the University of North Carolina at Wilmington.

Geology, Geochemistry, and Mineral Resource Assessment of the Southern Nantahala Wilderness and Adjacent Roadless Areas, Rabun and Towns Counties, Georgia, and Clay and Macon Counties, North Carolina

Geology, Geochemistry, and Mineral Resource Assessment of the Southern Nantahala Wilderness and Adjacent Roadless Areas, Rabun and Towns Counties, Georgia, and Clay and Macon Counties, North Carolina
Author: John D. Peper
Publisher:
Total Pages: 40
Release: 1991
Genre: Buzzard Knob Roadless Area (Ga.)
ISBN:
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The Southern Nantahala Wilderness and the Buzzard Knob and Southern Nantahala Roadless Areas are near one another and near the North Carolina-Georgia State line in Rabun and Towns Counties, Ga., and Clay and Macon Counties, N.C. The areas collectively span a region of polydeformed and metamorphosed rocks assigned to three major thrust sheets, from east to west the Tallulah Falls, Helen, and Richard Russell thrust sheets. Outcrop patterns and minor structures in the older sillimanite- grade Richard Russell rocks in the western part of the study area outline an earlier phase of isoclinal folding not apparent in the outcrop pattern of younger kyanite- and staurolite-grade Coweeta Group rocks immediately to the east across the Shope Fork fault in the east-central parts of the study area. Major movement on the Shope Fork fault postdates isoclinal F1 folding but preceded F2 isoclinal folding, because F1 fold traces are covered by rocks above the fault and the fault is folded by F2 folds. Later shearing along the fault occurred during F3 cross-folding. Geologic considerations and geochemical sampling and analysis suggest low potential for all mineral resources except common building stone. The potential for some other nonmetallic resources, including corundum, feldspar, sheet mica, and vermiculite, is moderate to low. These are present in limited amounts but are currently of little economic value. The small deposits of soapstone present in the areas are too impure to be considered a resource. Late Archaic-Early Woodland Indian bowl-carving sites in soapstone are an archeological heritage that might deserve conservation. Oil and gas resource potential is unknown but believed to be small. Resource potential for gold is low; for massive sulfide deposits containing some copper and zinc, it is low to moderate. There is little to no resource potential for other metals.

U.S. Geological Survey Bulletin

U.S. Geological Survey Bulletin
Author: Arthur Edward Nelson
Publisher:
Total Pages: 280
Release: 1983
Genre: Basalt
ISBN:
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Deformation Quadrangle, 1n the Stensgar Mountain Stevens County, Washington By James G. Evans Abstract Most deformation of the Middle and Late Proterozoic (Deer Trail and Windermere Groups) and Lower Cambrian (Addy Quartzite and Old Dominion Limestone) rocks in the Stensgar Mountain quadrangle occurred during the Mesozoic (pre-Late Jurassic, possibly Early Jurassic or Triassic), in con- nection with duplex thrusting. The principal deformation occurred in stages that generally involved: (1) thrusting, (2) penetrative dynamothermal metamorphism in the greenschist facies, and (3) renewed thrusting. The initial thrusting may have included formation of the duplex fault zone, moderate tilting of the sedimentary and volcanic rocks, and possibly low-grade metamorphism. The dynamothermal metamorphism resulted in development of a slaty cleavage that dips steeply west, as well as numerous minor and a few large folds that plunge at low to moderate angles, generally north. The folds have axial planes parallel to cleavage. Clasts in conglomerates were flattened parallel to cleavage, and their long axes were aligned north-northeastward, subparallel to fold axes. This extension direction parallels the trend of the Kootenay arc, a relation not typical of orogenic belts. The dynamothermal metamorphism included coaxial compressive pulses separated by periods of stress relaxation. The penetra- tive deformation could have been accompanied by slip on preexisting faults, including a large strike-slip component for the roof (Stensgar Mountain thrust) and floor (Lane Mountain thrust) thrusts of the duplex fault zone. Later movements along these roof and floor thrusts and connecting splays are suggested by nonfolded traces of the faults and the faulted, dynamothermally metamorphosed cataclasite adjacent to the Lane Mountain thrust. The penetrative deformation that affected the Stensgar Mountain quadrangle also affected the rest of northeastern Washington and southeastern British Columbia; it may have been the result of oblique convergence during Mesozoic subduction.