Spavinaw Granite (OKpCAg;0)

State	Oklahoma
Name	Spavinaw Granite
Geologic age	Phanerozoic \| Paleozoic \| Cambrian-Middle
Original map label	pCg
Comments	Comments: Exposed in few small outcrops near Spavinaw, Mayes Co, OK, Midcontinent region, however, data from over 300 drill holes indicate that terrane underlies most of northeast OK, eastern KS, southwest MO, and northern AR. Spavinaw consists of anorogenic epizonal granite and rhyolite that have not been regionally metamorphosed. Terrane includes Washington Volcanic Group, Spavinaw Granite Group, Osage Microgranite and Central Oklahoma Granite Group. U/Pb ages taken on zircons by other workers date Spavinaw at 1.40-1.35 Ga. (Kisvarsanyi, 1990)
Primary rock type	granite
Secondary rock type	rhyolite
Other rock types
Lithologic constituents	Major Igneous > Plutonic > Granitic > Granite (Batholith)
Map references	Heran, W. D., Green, G. and Stoeser, D. B., 2003, A Digital Geologic Map Database of Oklahoma: U. S. G. S. Open File Report 03-247
Unit references	Heran, W. D., Green, G. and Stoeser, D. B., 2003, A Digital Geologic Map Database of Oklahoma: U. S. G. S. Open File Report 03-247 Marcher, M.V., and Bingham R.H., 1971, Reconnaissance of the water resources of the Tulsa quadrangle, northeastern Oklahoma: Oklahoma Geological Survey, Hydrologic Atlas 2, scale 1:250,000, 4 sheets. (Geology on sheet 1 compiled by M.V. Marcher, in 1969.) Cederstrand, J.R., 1996k, Digital geologic map of Tulsa quadrangles, northeastern Oklahoma: U.S. Geological Survey Open-File Report 96-380, (2 diskettes), URL address is: http://ok.water.usgs.gov/gis/geology [http://ok.water.usgs.gov/gis/geology/tulsa.html] [http://ok.water.usgs.gov/gis/geology] Kisvarsanyi, E. B., 1990, General features of the St. Francois and Spavinaw granite-rhyolite terranes and the Precambrian metallogenic region of Southeast Missouri: U. S. Geological Survey Bulletin, Report: B 1932, pp.48-57 [http://pubs.er.usgs.gov/publication/b1932]
Geographic coverage	Mayes