Tectogenesis and metamorphism of the Piedmont from Columbia to Westview, Virginia along the James River

During Late Precambrian or Early Cambrian (~550 m.y.) a sequence of interlayered graywackes and shales was intruded by the Columbia granite. At approximately 340 m.y. the granite and sediments were metamorphosed to at least amphibolite facies. During the peak and waning stages of metamorphism, these lighologies experienced 3 or possibly 4 deformational events which occurred while faulting was initiated along the Lakeside fault zone. Retrogressive mineral assemblages in fractures along the Lakeside fault and Central Piedmont Lineament indicate that reactivations along these zones occurred during regional cooling and continued after 221 m.y. During Late Triassic or Early Jurassic, the region was intruded by diabase dikes. An erosional unconformity separates alluvium and colluvium from the layered and intrusive rocks.

Name thesis:degree_name

Master of Science

Level thesis:degree_level

masters

Discipline thesis:degree_discipline

Geological Sciences

Department dc:contributor.department

Geological Sciences

Grantor dc:publisher

Virginia Tech

Year dc:date.issued

1976

Author dc:creator

• Bourland, William Clifford

Chair dc:contributor.committeechair

• Glover, Lynn III

Committee members dc:contributor.committeemember

• Sinha, A. Krishna
• Hewitt, David A.

• metamorphism

Statement dc:rights

• In Copyright

Licence dc:rights.uri

• http://rightsstatements.org/vocab/InC/1.0/

Dc Identifier Other

etd-07152010-020125

OAI identifier oai:identifier

oai:vtechworks.lib.vt.edu:10919/43733