Trondhjemite (VAOCAtj;0)

State	Virginia
Name	Trondhjemite
Geologic age	Cambrian-Ordovician
Original map label	O[tj
Comments	Central Virginia Volcanic-Plutonic Belt. From expanded explanation (ref. VA002): Trondhjemite (Pavlides, 1990). Light-gray, leucocratic, fine-grained, allotriomorphic-granular; composed of intergrown albite and quartz exhibiting granophyric texture. Blue-green amphibole and garnet are present locally.
Primary rock type	trondhjemite
Secondary rock type
Other rock types
Lithologic constituents	Major Igneous > Plutonic > Granitic > Tonalite > Trondhjemite
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/ [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/ [https://www.dmme.virginia.gov/commerce/]
Geographic coverage	Stafford