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Late Proterozoic Extensional Deformation of Blue Ridge Basement in Virginia: Supporting Evidence from Simple Field Relations
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Late Proterozoic Extensional Deformation of Blue Ridge Basement in Virginia: Supporting Evidence from Simple Field Relations
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Journal Article
Late Proterozoic Extensional Deformation of Blue Ridge Basement in Virginia: Supporting Evidence from Simple Field Relations
1994
Overview
Field relations in northern Virginia support the interpretation that a significant portion of the finite strain in the basement terrane of the Blue Ridge anticlinorium is a result of continental rifting in the Late Proterozoic. Widespread greenschist-facies disjunctive foliation overprints high-temperature Grenvillian textures in basement orthogneisses. An identical foliation occurs in randomly oriented, basement-derived boulders within Late Proterozoic rift-facies conglomerates of the cover sequence. The disjunctive foliation in the basement is also truncated at the exposed contact with cover rocks, and a greenschist-facies phyllonite zone in the basement is truncated at a Late Proterozoic syn-rift fault. These greenschist-facies tectonic fabrics, which are clearly pre-Paleozoic in age, are similar to fabrics in extensional shear zones in basement rocks that have been shown by others to predate Paleozoic compressional structures.
