Geologic map of the Green Bay 7.5-minute quadrangle, Prince Edward County, Virginia

Peper, John D.; Hackley, Paul C.

doi:10.3133/ofr99423

Cited by 2 publications

(6 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The idea of a northward extension of slate belt lithologies was earlier suggested by Burton and Armstrong (1997), and Horton and others (1999), and was confirmed by our work in the current study area (Hackley and Peper, 1998;Peper and Hackley, 1999). Our mapping has demonstrated the continuation of the slate belt stratigraphy and structure northward across the study area and into a cross-cutting intrusive body ( fig.…”

Section: Northward Continuation Of the Slate Beltsupporting

confidence: 86%

“…Hyco Formation lithologies immediately flank the Aaron on both limbs of the structure; however, the total extent of the Hyco Formation in all of the quadrangles shown is not completely known, and the westward Hyco contact with Milton terrane lithologies is unconstrained. Geologic mapping of Omega 7.5-minute quadrangle by Kreisa (1980), Buffalo Springs by Peper and Olinger (1998) Hackley and Peper (1998), and Green Bay by Peper and Hackley (1999). (Hackley and Peper, 1998), Meherrin (unpublished mapping, J. D. Peper and P. C. Hackley, 1997), and Green Bay 7.5-minute quadrangles showing locations of metamorphic isograds, the axial trace of the refolded Dryburg syncline, and the distribution of lithologic units.…”

Section: Hyco Formationmentioning

confidence: 98%

“…4). Plutonic rocks in the study area have not been dated by radiogenic techniques, but were assigned ages (Hackley and Peper, 1998;Peper and Hackley, 1999) consistent with their similarity to nearby plutonic bodies that have been isotopically dated. Future research should include radiometric dating of these units, particularly the metatonalite of Dry Creek (Zdc), which underlies the southeastern part of the study area ( fig.…”

Section: Intrusive Rocksmentioning

confidence: 99%

“…4). Isograds were located based on the identification of garnet and kyanite Ϯ staurolite in the field and in thin sections (Hackley and Peper, 1998;Peper and Hackley, 1999). In addition, data from the previous mapping and petrologic studies of Jonas (1932), Espenshade and Potter (1960), Bennett (ms, 1961), and Achtermann (ms, 1985) were evaluated to locate isograds.…”

Section: Metamorphic Isogradsmentioning

confidence: 99%

“…The following sections provide brief descriptions of the Hyco and Aaron Formations, with attention drawn to details that illustrate the northward increase in metamorphic grade across the study area shown in figure 4. More specific information and lithologic descriptions of individual map units are provided in Hackley and Peper (1998), and Peper and Hackley (1999).…”

Section: Regional Geologic Settingmentioning

confidence: 99%

See 4 more Smart Citations

Northward extension of carolina slate belt stratigraphy and structure, south-central virginia: Results from geologic mapping

Hackley¹,

Peper²,

Burton³

et al. 2007

American Journal of Science

View full text Add to dashboard Cite

Geologic mapping in south-central Virginia demonstrates that the stratigraphy and structure of the Carolina slate belt extend northward across a steep thermal gradient into upper amphibolite-facies correlative gneiss and schist. The Neoproterozoic greenschist-facies Hyco, Aaron, and Virgilina Formations were traced northward from their type localities near Virgilina, Virginia, along a simple, upright, northeast-trending isoclinal syncline. This syncline is called the Dryburg syncline and is a northern extension of the more complex Virgilina synclinorium. Progressively higher-grade equivalents of the Hyco and Aaron Formations were mapped northward along the axial trace of the refolded and westwardly-overturned Dryburg syncline through the Keysville and Green Bay 7.5-minute quadrangles, and across the northern end of the Carolina slate belt as interpreted on previous geologic maps. Hyco rocks, including felsic metatuff, metawacke, and amphibolite, become gneisses upgrade with areas of local anatexis and the segregation of granitic melt into leucosomes with biotite selvages. Phyllite of the Aaron Formation becomes garnet-bearing mica schist. Aaron Formation rocks disconformably overlie the primarily felsic volcanic and volcaniclastic rocks of the Hyco Formation as evidenced by repeated truncation of internal contacts within the Hyco on both limbs of the Dryburg syncline at the Aaron-Hyco contact.East-northeast-trending isograds, defined successively by the first appearance of garnet, then kyanite ؎ staurolite in sufficiently aluminous rocks, are superposed on the stratigraphic units and synclinal structure at moderate to high angles to strike. The textural distinction between gneisses and identifiable sedimentary structures occurs near the kyanite ؎ staurolite-in isograd. Development of the steep thermal gradient and regional penetrative fabric is interpreted to result from emplacement of the Goochland terrane adjacent to the northern end of the slate belt during Alleghanian orogenesis. This mapping study indicates that the Carolina slate belt does not terminate on the north against through-going faults or rest on higher-grade basement as previously suggested.

show abstract

Section: Northward Continuation Of the Slate Beltsupporting

confidence: 86%