Mesozoic granitic rocks, undivided

Granite, quartz monzonite, quartz diorite, granodiorite, and trondhjemite. Includes diorite in southeastern Washington; diorite and gabbro near Concunully in Okanogan County; gneiss, schist, and migmatites in areas of Chelan, Colville, and Okanogan batholiths. Includes high-grade metamorphic rocks of Precambrian age in Spokane area.
State Washington
Name Mesozoic granitic rocks, undivided
Geologic age Mostly Cretaceous-Jurassic
Lithologic constituents
Igneous > Plutonic > Granitic > Granite (Batholith)
Igneous > Plutonic > Granitic > Tonalite (Pluton)Includes tronhjemite.
Igneous > Plutonic > Granitic > Granodiorite (Batholith)Possibly major in rank.
Igneous > Plutonic > Syenitic > Quartz-monzonite (Pluton)Kaniksu Batholith (Schroeder, 1952).
Metamorphic > Metaigneous > OrthogneissMostly tonalitic and granodioritic orthogneiss.
Metamorphic > Migmatite
Igneous > Plutonic > Gabbroic > Gabbro (Pluton)
Metamorphic > Schist
Igneous > Plutonic > Dioritic > Diorite (Pluton)Includes quartz diorite.
Igneous > Plutonic > Syenitic > Syenite (Pluton)
Comments Includes significant portions, primarily orthogneiss, of the Kettle Metamorphic Core Complex and the Okanogan Metamorphic Core Complex, as well as orthogneiss in the Okanogan Batholith area. Metamorphic rocks near Spokane include quartzite and possibly meta-argillite and hornfels of Belt Supergroup (Stoffel and others, 1991). Note that Stoffel and others, 1991, report that while the term "Loon Lake Granite" was once widely used, it has since been abandoned.
Stratigraphic units Colville batholith; Kaniksu Batholith (including Spirit pluton); Loon Lake granite; Mount Stuart granodiorite; Osoyoos granodiorite; Similkameen batholith; Whisky Mountain granodiorite; Cooper Mtn Batholith; Okanogan Batholith

Huntting, M.T., Bennett, W.A.G., Livingston, V.E.Jr., and Moen, W.S., 1961, Geologic Map of Washington: Washington Division of Mines and Geology, scale 1:500,000.

Park, C.F.Jr., and Cannon, R.S.Jr., 1943, Geology and Ore Deposits of the Metaline Quadrangle, Washington: U. S. Geological Survey Professional Paper 202, 81 p.

Weaver, C.E., 1920, The Mineral Resources of Stevens County: Washington Geological Society Bulletin No. 20, 350 p.

Campbell, I. and Loofbourow, J.S.Jr., 1962, Geology of the Magnesite Belt of Stevens County Washington, U. S. Geological Survey Bulletin 1142-F, F1-F53 p.

Stoffel, K.L., Joseph, N.L., Waggoner, S.Z., Gulick, C.W., Korosec, M.A., Bunning, B.B., 1991, Geologic Map of Washington--Northeast Quadrant: Washington Division of Geology and Earth Resources Geologic Map, GM-39, scale 1:250,000.

Schroeder, M.C., 1952, Geology of the Bead Lake District, Pend Oreille County, Washington: Washington Division of Mines and Geology Bulletin No. 40, 57 p.

Cater, F.W. and Wright, T.L., 1967, Geologic Map of the Lucerne Quadrangle, Chelan County, Washington: U. S. Geological Survey Geologic Quadrangle Map GQ-647, scale 1:62,500.

Tabor, R.W., Frizzell, V.A.,Jr., Booth, D.B., Waitt, R.B., Whetten, J.T., Zartman, R.E., 1993, Geologic Map of the Skykomish River 30- by 60-Minute Quadrangle, Washington: U. S. Geological Survey Miscellaneous Investigations Series Map I-1963, scale 1:100,000.

Yates, R.G. and Engels, J.C., 1968, Potassium-Argon Ages of Some Igneous Rocks in Northern Stevens County, Washingon: U. S. Geological Survey Professional Paper 600-D, p. D242-D247.

Dragovich, J.D., Logan, R.L., Schasse, H.W., Walsh, T.J., Lingley, W.S., Jr., Norman, D.K., Gerstel, W.J., Lapen, T.J., Schuster, J.E., Meyers, K.D., 2002, Geologic Map of Washington-Northwest Quadrant: Washington Division of Geology and Earth Resources Geologic Map GM-50, scale 1:250,000.

NGMDB product
Counties Chelan - Columbia - Douglas - Ferry - Garfield - Grant - King - Kittitas - Lincoln - Okanogan - Pend Oreille - Skagit - Snohomish - Spokane - Stevens - Whitman