Constraints on Alleghanian vertical displacements in the southern Appalachian Piedmont, based on aluminum-in-hornblende barometry

Journal Article · Mon Oct 01 04:00:00 EDT 1990 · Geology; (USA)

DOI:https://doi.org/10.1130/0091-7613(1990)018<0938:COAVDI>2.3.CO;2· OSTI ID:6140126

Vyhnal, C R; McSween, Jr, H Y ^[1]

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1. Univ. of Tennessee, Knoxville (USA)

Aluminum-in-hornblende barometry of Alleghanian granitoid plutons in the southern Appalachian Piedmont provides new constraints on synorogenic, vertical crustal displacements. Systematic differences in depths of emplacement between plutons in the Carolina slate belt and the Charlotte and Kings Mountain belts appear to confirm previously proposed Alleghanian folding of earlier isothermal surfaces. The Kiokee and Raleigh belts represent ductile horsts that have undergone as much as 18.5 and 15.1 km, respectively, or normal displacement along boundary faults prior to late Alleghanian dextral shearing Plutons in or near the Eastern slate and Belair belts were emplaced at depths similar to those in the Carolina slate belt. Plutons partly or completely covered by Atlantic Coastal Plain sediments, however, appear to have been emplaced deeper and earlier, perhaps reflecting uplift prior to Alleghanian time. Geothermal gradients for the various lithotectonic belts estimated from these data are consistent with the previously recognized decrease in Alleghanian metamorphic overprinting away from the Kiokee-Raleigh belt thermal axis.

• OSTI ID: 6140126
• Journal Information: Geology; (USA), Journal Name: Geology; (USA) Vol. 18:10; ISSN GLGYB; ISSN 0091-7613
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
580000* -- Geosciences
ALUMINIUM
AMPHIBOLE
APPALACHIAN BASIN
CONTINENTAL CRUST
DEPTH
DIMENSIONS
EARTH CRUST
ELEMENTS
FEDERAL REGION IV
GEOBAROMETRY
GEOLOGIC FAULTS
GEOLOGIC FRACTURES
GEOLOGIC HISTORY
GEOLOGIC STRUCTURES
GEOTHERMAL GRADIENTS
GROUND UPLIFT
HORNBLENDE
IGNEOUS ROCKS
METALS
METAMORPHISM
MINERALS
NORTH AMERICA
NORTH CAROLINA
PLUTONIC ROCKS
RESERVOIR PRESSURE
ROCKS
SEDIMENTARY BASINS
SEDIMENTS
SILICATE MINERALS
SOUTH CAROLINA
STRATA MOVEMENT
TECTONICS
TEMPERATURE GRADIENTS
USA