Document Type
Thesis
Abstract
The Hobbs Mill pluton is a small, previously-unnamed pluton located in the Raleigh Terrane near Namozine Creek, on the border of Dinwiddie and Nottoway counties, Virginia. Aside from preliminary field observations made by Dr. Rick Berquist, the field characteristics, mineralogy, and geochemical constraints of this pluton were unknown. Results from field observations indicate that the actual size of the pluton is much larger than previously thought, and the pluton exhibits two distinct textural varieties of granite. Modal and chemical analyses confirm the pluton as a monzogranite. Samples from the granite range from peraluminous to metaluminous with a low Ga/AI ratio, and the granite plots in the I-, S-, and M-type granite field. In a Rb vs. (Y + Nb) discrimination diagram, the granite plots in and around the volcanic are granite (VAG) field. These field and chemical results are similar to common characteristics of known Alleghanian-age plutons, and are unlike characteristics of known late Proterozoic plutons. These results suggest that the Hobbs Mill pluton is probably Alleghanian in age.
Date Awarded
2003
Department
Geology
Advisor 1
Brent E. Owens
Recommended Citation
Znidarsic, Christina M., "Field, Mineralogical, and Geochemical Characteristics of a Small Granitic Pluton in the Raleigh Terrane, Virginia" (2003). Geology Senior Theses. William & Mary. Paper 124.
https://scholarworks.wm.edu/geologyseniors/124
