Journal Article10.1306/703C8ED9-1707-11D7-8645000102C1865D
Three-Dimensional Structural Interrelationships Within Cambrian-Ordovician Lithotectonic Unit of Central Appalachians
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TL;DR: A block diagram of the Cambrian-Ordovician unit illustrates three-dimensional structural relationships within that sequence along the length of the central Appalachian Valley and Ridge and High Plateau provinces as mentioned in this paper.
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Abstract: A block diagram of the Cambrian-Ordovician lithotectonic unit illustrates three-dimensional structural relationships within that sequence along the length of the central Appalachian Valley and Ridge and High Plateau provinces. The diagram shows that the Valley and Ridge province is divisible into areas within which shortening is relatively constant in the Cambrian-Ordovician lithotectonic unit. These areas are bounded by zones across which significant differences in shortening occur. These transition zones contain major cross-strike structural discontinuities in surface structure; in some instances, these discontinuities extend across the Valley and Ridge province and into the High Plateau province. Increases in fold amplitude and number occur in the cover of the Plateau, across strike from the more intensely deformed areas of the Valley and Ridge, where shortening within the Cambrian-Ordovician unit is significantly greater than elsewhere within that province. Structurally controlled gas accumulations are more prevalent in these areas of the Plateau.
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Citations
Duplex style and triangle zone formation: insights from physical modeling
TL;DR: In this article, the strength of the decollements relative to that of the intervening and overlying rock layers plays a significant role in controlling the duplex style, and the results indicate that specific associations of structural features form systematically under similar rheological and boundary conditions.
174
Fluid inclusion and stable isotope analyses of veins from the central Appalachian Valley and Ridge province: Implications for regional synorogenic hydrologic structure and fluid migration
Mark Evans,Denise A. Battles +1 more
TL;DR: Fluid inclusion microthermometric analyses and O and C stable isotopic analyses of vein minerals are used to determine the chemistry and trapping conditions of fluids present in the central Appalachian fold-and-thrust belt during the late Paleozoic Alleghanian orogeny as mentioned in this paper.
120
Fractal interrelationships between topography and structure
Thomas H. Wilson,Jovita Dominic +1 more
TL;DR: Fractal interrelationships between topography and structure are investigated in two areas of the North American central Appalachian Mountains: one in the intensely deformed Valley and Ridge province and the other in the relatively undeformed foreland area of the Appalachian Plateau province as mentioned in this paper.
Broad Top Thrust Sheet: An Extensive Blind Thrust in the Central Appalachians (1)
TL;DR: In this article, a large blind thrust, the Broad Top thrust, is much more extensive than previously realized, and it extends across the 15 mi (24 km) width of the Nittany anticlinorium, a dominate structural element that lies along the western margin of the Valley and Ridge province adjacent to the Plateau province in the Appalachian foreland.
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Differential transport and continuity of thrust sheets
TL;DR: In this paper, empirical measurements of differential transport angles for continuous thrust sheets from different North American fold-thrust belts yield bulk shear angles that do not exceed 35-40° without formation of tear faults.
33
References
Thin-Skinned Tectonics in the Plateau and Northwestern Valley and Ridge Provinces of the Central Appalachians
TL;DR: In this article, the authors investigated the role of detachment thrusts in the folding of the Central Appalachians and found that the majority of the thrust sheets in the Southern Appalachians have been exposed by erosion, whereas the major Central Appalachian thrust sheets are stil covered by a mile or more of stratified rocks.
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Fossil distortion and décollement tectonics of the Appalachian Plateau
Terry Engelder,Richard Engelder +1 more
TL;DR: Fossil distortion and solution cleavage are associated with low-amplitude folds on the outer fringes of the Appalachian foreland fold belt Deformed fossils, sampled from Upper Devonian rocks in western New York, correspond to horizontal strain ellipses with axial ratios of as much as 15 and with long axes precisely parallel to the Appalachian fold trend as discussed by the authors.
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Mechanics of Appalachian Foreland Folding in Pennsylvania and West Virginia
TL;DR: In this article, it was shown that the Appalachian foreland folds of Pennsylvania and West Virginia result from the slipping of the upper strata of a part of the Appalachian Plateau northwestward over their substratum, as a marginal effect of the deformation of the Valley and Ridge province on the southeast.
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