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Title Geophysical studies of large blind thrust, Valley and Ridge province, central Appalachians
Creator/Author Wilson, T.H.
Publication Date1989 Mar 01
OSTI IdentifierOSTI ID: 6129454
Other Number(s)CODEN: AABUD
Resource TypeJournal Article
Resource RelationAAPG (Am. Assoc. Pet. Geol.) Bull. ; Vol/Issue: 73:3
Research OrgWest Virginia Univ., Morgantown (USA)
Subject020200 -- Petroleum-- Reserves, Geology, & Exploration; APPALACHIAN MOUNTAINS-- GEOPHYSICAL SURVEYS; CAMBRIAN PERIOD;DEVONIAN PERIOD;GEOLOGIC STRUCTURES;LITHOLOGY;ORDOVICIAN PERIOD;SILURIAN PERIOD;TECTONICS
Related SubjectGEOLOGIC AGES;MOUNTAINS;PALEOZOIC ERA;SURVEYS
Description/Abstract Possible thrust-sheet geometries in the unexposed Cambrian-Ordovician lithotectonic unit in the Nittany anticlinorium of the Valley and Ridge province in West Virginia are defined through analysis of geophysical data.^Calculated gravity for different subsurface interpretations is compared with observed gravity.^Comparisons of model calculations to terrain-corrected Bouguer gravity indicate that a large blind thrust of the Cambrian-Ordovician lithotectonic unit, extending across the entire width of the anticlinorium, is an acceptable subsurface interpretation.^A seismic line across the anticlinorium is also presented.^The seismic line reveals that a large part of the area is underlain by a double thickness of the Cambrian-Ordovician lithotectonic unit.^Data can be interpreted many ways.^However, the gravity data require that an acceptable model have only minor lateral density contrasts across the anticlinorium so that effectively, a double thickness of the Cambrian Ordovician lithotectonic unit exists across it.^Both the gravity and seismic data indicate that the presence of separate horses beneath the major Silurian-Devonian structures exposed at the surface is unlikely.^12 figures.
Country of PublicationUnited States
LanguageEnglish
FormatPages: 276-288
System Entry Date2001 May 13

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