Date Thesis Awarded

5-2009

Document Type

Honors Thesis

Degree Name

Bachelors of Science (BS)

Department

Geology

Advisor

Christopher M. Bailey

Committee Member

Brent Edward Owens

Committee Member

David W. Thompson

Committee Member

Scott Southworth

Abstract

The Mesoproterozoic (1180-1030 Ma) basement complex in the central Virginia Blue Ridge consists of several mineralogically and texturally heterogeneous units. Near Crozet, Virginia, five compositionally distinct rock types occur and include: 1) layered gneiss, 2) charnockite and charnockitic gneiss, 3) biotite granitoid gneiss, 4) leucogranite, and 5) megacrystic granitoid. Two distinct foliations, including a high-temperature amphibolite to granulite facies and a low-temperature greenschist facies fabric, are variably developed in rocks with different deformation intensities. Several anastomosing northeast-southwest trending high-strain zones, including the connected Rockfish Valley and White Hall high-strain zones, cut through the basement complex. Lenses of relatively less deformed rock occur within the 1-3 km wide high-strain zones. Kinematic analysis indicates general shear with possible triclinic symmetry and apparent flattening strain. Palinspastic reconstruction of a cross-section to its undeformed state reveals 35% total shortening and less than 3 km of vertical displacement.

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 3.0 License.

Comments

Thesis is part of Honors ETD pilot project, 2008-2013. Migrated from Dspace in 2016.

Share

COinS