Roig, Claudia I.

Profile Picture

Filters

20191
Reset filters

Settings

Citations

Publication Search Results

Now showing 1 - 1 of 1
  • Thumbnail Image
    Publication
    Geochemistry, U-Pb geochronology, and tectonic significance of the Elk Hill Volcanic Complex and the Pegmatite Belt, central Appalachian Piedmont, Virginia.
    (2019-12-11) Roig, Claudia I.; Hughes, Kenneth S.; College of Arts and Sciences - Sciences; Hudgins, Thomas R.; Hibbard, James P.; Department of Geology; López del Puerto, Carla
    This thesis reports crystallization ages for the Elk Hill Volcanic Complex (EHVC) and for the Pegmatite Belt (PB) in the central Appalachian Piedmont of Virginia. ID-TIMS U-Pb zircon geochronology yield an intercept age of 331.6 ± 5.8 Ma for one sample from the EHVC, and intercept ages of 423.7 ± 1.5 Ma and 427.9 ± 4.3 Ma for two samples from the PB, both within 2σ uncertainty. Petrographical analysis showed that rocks from the EHVC and the PB have complex geologic histories, and all exhibit low to medium degree of foliation. Based on QAP classification, thirteen suspected granitoids within the PB and the EHVC were classified into five (5) main groups: syeno granites, granodiorites, monzogranites, alkali feldspar granites, and quartz syenite. Major element silica variation diagrams showed scattering and no clear trend that would suggest a differentiation path or petrogenetic relationship between the PB and the EHVC. Samples were divided into three distinct groups based on LREE behavior similarities. These groups were also observed when plotted in trace element tectonic discrimination diagrams, with signatures of syncollisional and volcanic arc granites. Lithotectonic relationship between the EHVC and the PB and crystallization ages reinforce the initial assumption that these are distinct, but an overlap in geochemical signatures suggest to a common petrogenesis and source during Alleghanian-related tectonics that affected the Central Piedmont.