Tertiary-Cretaceous granitic intrusive rocks

Granite, granodiorite, trondhjemite, and quartz diorite. Late Cretaceous and/or early Tertiary.
State Washington
Name Tertiary-Cretaceous granitic intrusive rocks
Geologic age Early Tertiary-Late Cretaceous
Lithologic constituents
Major
Igneous > Plutonic > Granitic > Granodiorite (Pluton)
Igneous > Plutonic > Granitic > Granite (Pluton)
Igneous > Plutonic > Granitic > Tonalite > Trondhjemite (Pluton)
Minor
Igneous > Plutonic > Dioritic > Quartz-diorite (Pluton)
Igneous > Plutonic > Dioritic > Quartz-monzodiorite (Pluton)
Igneous > Plutonic > Granitic > Tonalite (Pluton)
Incidental
Metamorphic > Metaigneous > Orthogneiss
Igneous > Plutonic > Gabbroic > Gabbro (Pluton)Includes any monzogabbro.
Metamorphic > Schist
Comments Black Peak Batholith of Okanogan County comprised of tonalite and tonalitic gneiss (Miller, 1987, Dragovich and others, 2002). Other workers have reported it to be quartz diorite with diorite, granodiotite, and orthogneiss (Barksdale, 1975). The contact between the Black Peak Batholith and the Skagit Gneiss to the south is really a gradual transition from one rock type to the other (Adams, 1964). The plutons in Ferry County are mostly quartz monzodiorite but range in composition from granodiorite to monzogabbro; include incidental granite and intrude into meta-igneous rocks, including orthogneiss and calc-silicate schist (Stoffel, 1990)
Stratigraphic units Black Peak Batholith; Ruby Creek Plutonic Belt (minus the Ruby Creek migmatites which are mapped in WApJsc)
References

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.

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.

Miller, R.B., 1987, Geology of the Twisp River-Chelan Divide Region, North Cascades, Washington: Washington Division of Geology and Earth Resources Open File Report 87-17, 12 p.

Misch, P., 1977, Bedrock Geology of the North Cascades, in Brown, E. H. and Ellis, R. C. (eds.), Geological Excursions in the Pacific Northwest, Geological Society of America 1977 Annual Meeting, Seattle: Western Washington University, p. 1-62.

Barksdale, J.D., 1975, Geology of the Methow Valley, Okanogan County, Washington: Washington Division of Geology and Earth Resources Bulletin no. 48, 72 p.

Adams, J.B., 1964, Origin of the Black Peak Quartz Diorite, Northern Cascades, Washington: American Journal of Science, v. 262, no. 3, p. 290-306.

Stoffel, K.L., 1990, Geologic Map of the Republic 1:100,000 Quadrangle, Washington: Washington Division of Geology and Earth Resources Open File Report 90-10, 62 p, 1 pl.

Joseph, N.L., 1990b, Geologic Map of the Nespelem 1:100,000 Quadrangle, Washington: Washington Division of Geology and Earth Resources Open File Report 90-16, 47 p., 1 pl.

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.

Tabor, R.W., Booth, D.B., Vance, J.A., Ford, A.B., Ort, M.H., 1988, Preliminary geologic map of the Sauk River 30 by 60 minute quadrangle, Washington: U. S. Geological Survey Open File Report 88-692, 51 p., 1 pl.

NGMDB product
Counties Chelan - Ferry - Okanogan - Skagit - Snohomish - Whatcom