Major Tectonic Features and Structural Elements in the Northwest Part of the Greenville Quadrangle, Georgia PDF Download
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Author: Arthur Edward Nelson
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 32
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Book Description
A study of major structural features, tectonic fabrics, and fold analyses of polydeformed metamorphic rocks comprising three major thrust sheets that together form a large part of the southern Appalachian Mountains in northeast Georgia.
Author: Arthur Edward Nelson
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 32
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Book Description
A study of major structural features, tectonic fabrics, and fold analyses of polydeformed metamorphic rocks comprising three major thrust sheets that together form a large part of the southern Appalachian Mountains in northeast Georgia.
Author:
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 542
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Author: Arthur Edward Nelson
Publisher:
ISBN:
Category : Basalt
Languages : en
Pages : 280
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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.
Author: Geological Survey (U.S.)
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 826
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Author: Arthur Edward Nelson
Publisher:
ISBN:
Category : Metamorphism (Geology)
Languages : en
Pages : 24
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Book Description
Thrust sheets that underlie the Greenville quadrangle in northeastern Georgia and in northwestern South Carolina have been selectively metamorphosed and deformed during several Paleozoic prograde metamorphic events.
Author: John D. Peper
Publisher:
ISBN:
Category : Buzzard Knob Roadless Area (Ga.)
Languages : en
Pages : 40
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Book Description
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.
Author: Harry J. Dowsett
Publisher:
ISBN:
Category : Buzzard Knob Roadless Area (Ga.)
Languages : en
Pages : 270
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Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 962
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Author: Robert D. Hatcher, Jr.
Publisher: Geological Society of America
ISBN: 0813754526
Category : Science
Languages : en
Pages : 784
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Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 956
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