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Mesoproterozoic magmatism and deformation in the northern Blue Ridge, Virginia and Maryland: Application of SHRIMP U-Pb geochronology and integrated field studies in the definition of Grenvillian tectonic history

Southworth, Scott; Aleinikoff, John N.; Tollo, Richard P.; Bailey, Christopher M.; Burton, William C.; Hackley, Paul C.; Fanning, Christopher

Description

Geologic mapping of Mesoproterozoic lithologies and foliations, and sensitive high-resolution ion microprobe (SHRIMP) U-Pb crystallization ages of 43 samples of orthogneisses and metagranitoids from the northern Blue Ridge establish new subdivisions: group 1 (1183-1144 Ma), group 2 (1143-1111 Ma), and group 3 (1078-1028 Ma). Protoliths of group 1 were metamorphosed at amphibolite- to granulite-facies conditions and strongly deformed between ca. 1153 and ca. 1144 Ma. Metagranitoids of groups 2...[Show more]

CollectionsANU Research Publications
Date published: 2010
Type: Book chapter
URI: http://hdl.handle.net/1885/51526
DOI: 10.1130/2010.1206(31)

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