Thin-skinned tectonics in the crystalline southern Appalachians; COCORP seismic-reflection profiling of the Blue Ridge and Piedmont

Cook, Frederick A.; Albaugh, D. S.; Brown, L. D.; Kaufman, S.; Oliver, Jack; Hatcher, Robert D.

doi:10.1130/0091-7613(1979)7<563:ttitcs>2.0.co;2

Cited by 392 publications

(152 citation statements)

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“…The upper one climbs from the crystalline basement of the Blue Ridge basement block northwestward into the Proterozoic and Palaeozoic strata. The Blue Ridge basement was transported over a distance of up to 260 km along this décollement [241], and the entire thrust sheet was affected by important internal shortening as indicated by the imbricate thrusts branching off the décollement layer [239]. The lower décollement beneath the Blue Ridge is within the Cambrian Rome Formation but climbs up section to the NW.…”

Section: Southern Appalachiansmentioning

confidence: 99%

Thick-Skinned and Thin-Skinned Tectonics: A Global Perspective

Pfiffner¹

2017

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This paper gives an overview of the large-scale tectonic styles encountered in orogens worldwide. Thin-skinned and thick-skinned tectonics represents two end member styles recognized in mountain ranges. A thick-skinned tectonic style is typical for margins of continental plates. Thick-skinned style including the entire crust and possibly the lithospheric mantle are associated with intracontinental contraction. Delamination of subducting continental crust and horizontal protrusion of upper plate crust into the opening gap occurs in the terminal stage of continent-continent collision. Continental crust thinned prior to contraction is likely to develop relatively thin thrust sheets of crystalline basement. A true thin-skinned type requires a detachment layer of sufficient thickness. Thickness of the décollement layer as well as the mechanical contrast between décollement layer and detached cover control the style of folding and thrusting within the detached cover units. In subduction related orogens, thin-and thick-skinned deformation may occur several hundreds of kilometers from the plate contact zone. Basin inversion resulting from horizontal contraction may lead to the formation of basement uplifts by the combined reactivation of pre-existing normal faults and initiation of new reverse faults. In composite orogens thick-skinned and thin-skinned structures evolve with a pattern where nappe stacking propagates outward and downward.

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Section: Southern Appalachiansmentioning

confidence: 99%

Thick-Skinned and Thin-Skinned Tectonics: A Global Perspective

Pfiffner¹

2017

Preprint

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“…The Blue Ridge-Piedmont fault system thrust the entire Blue Ridge province northwest over Paleozoic sedimentary rock of the Valley and Ridge province during the Alleghanian orogeny (Ref. [149][150][151][152][153][154]. The Blue Ridge geologic province reaches its greatest width in the southern Appalachians.…”

Section: Blue Ridge Provincementioning

confidence: 99%

Natural Phenomena Hazards Design Criteria and Other Characterization Information for the MFFF at SRS

Wyatt¹

2000

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“…STRATIGRAPHY-Major stratigraphic units within the Jefferson terrane from north to south include the Lynchburg Group as redefined by Rankin and others (1993a), a mafic volcanic unit east of Charlottesville, Virginia, which has been mapped as the "Catoctin Formation," Ashe Formation as redefined by Rankin and others (1993a), Alligator Back and Tallulah Falls Formations, Coweeta Group of Hatcher (1979), Richard Russell Formation, Helen Group, Sandy Springs Group (in part), New Georgia Group of Abrams and McConnell (1981), Wedowee Group as used by Tull (1978), Emuckfaw Formation of Neathery and Reynolds (1975), and Ashland Supergroup as revised by Tull (1978). The gneisses are quartzose, indicating a significant continental contribution.…”

Section: Na2e: Jefferson Terranementioning

confidence: 99%

“…REFERENCES- Abbott and Raymond (1984); Abrams and McConnell (1981); Absher and McSween (1985); Edelman and others (1988); Hatcher (1979); others (1984, 1988); Horton and others (1989a); Lacazette and Rast (1989); Lipin (1984); Neathery and Reynolds (1975); Odom and Fullagar (1973); Rankin and others (1989Rankin and others ( , 1991Rankin and others ( , 1993a; Shaw and Wasserburg (1984); Stow and others (1984); Tull (1978); Wehr (1985); Wones and Sinha (1988) NA2g: POTOMAC COMPOSITE TERRANE TERRANE BOUNDARIES-In Virginia, the Potomac composite terrane, as defined by Drake (1985a), has been thrust along the Mountain Run fault zone onto the True Blue formation (informal name) of Pavlides (1989). This map includes the True Blue in the Jefferson terrane, following the interpretation of Horton and others (1989a), although Pavlides (1989) regards the True Blue as part of Laurentia.…”

Section: Na2e: Jefferson Terranementioning

confidence: 99%