|From the desk of Bruce Wilkinson:|
Owens, B.E. Samson, Scott, and King, S.E., 2013, Geochemistry of the Arvonia Formation, Chopawamsic Terrane, Virginia; implications for source area weathering and provenance: American Journal of Science, v. 313, p. 242-266.
"The metasedimentary Arvonia Formation in the Piedmont Province of central Virginia ranges primarily from slates to garnet schists, which unconformably overly Middle Ordovician metavolcanic rocks of the Chopawamsic arc terrane. (They) report whole-rock major and trace element compositions as well as Nd-isotopic compositions of the Arvonia Formation, and use these results to evaluate further its origin. Collectively, (their) results are consistent with derivation of Arvonia sediments from a single source or well-mixed sources of typical upper crustal composition. The isotopic data are compatible with a Laurentian provenance, however, they are equally compatible with a strictly Chopawamsic crustal source based on available Nd isotopic data."