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Biotite Granite

Biotite granite
StateVirginia
NameBiotite Granite
Geologic ageProterozoic
Original map labelgrb
CommentsCentral Virginia Volcanic-Plutonic Belt From expanded explanation (ref. VA002): Biotite granite. Gray to white, medium-grained, massive to layered granite and granite gneiss range in composition from granite to quartz diorite. Quartz diorite dikes and sills are locally abundant. Mineralogy: quartz + potassium feldspar + plagioclase + biotite + epidote + muscovite +/- clinopyroxene + hornblende. This unit intrudes biotite gneiss unit (Cbg).
Primary rock typegranite
Secondary rock type
Other rock types
Lithologic constituents
Major
Igneous > Plutonic > Granitic > Granitebiotite granite
Map references
Digital Representation of the 1993 Geologic Map of Virginia", 2003, CD ROM (ISO-9660) contains image file, expanded explanation in pdf, and ESRI shapefiles, viewing software not included. This is a digital version of "Geologic Map of Virginia" published in 1993. Available from: https://www.dmme.virginia.gov/commerce/
Unit references
Virginia Division of Mineral Resources, 1993, Geologic Map of Virginia: Virginia Division of Mineral Resources, scale 1:500,000
Digital Representation of the 1993 Geologic Map of Virginia - expanded explanation: 2003, Commonwealth of Virginia, Department of Mines, Minerals, and Energy, Divsion of Mineral Resources, Publication 147, 85 pp
Digital Representation of the 1993 Geologic Map of Virginia", 2003, CD ROM (ISO-9660) contains image file, expanded explanation in pdf, and ESRI shapefiles, viewing software not included. This is a digital version of "Geologic Map of Virginia" published in 1993. Available from: https://www.dmme.virginia.gov/commerce/
Geographic coverageCharlotte - Cumberland - Goochland - Halifax

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URL: http://mrdata.usgs.gov/geology/state/sgmc-unit.php?unit=VAgrb;0
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