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Intermediate intrusions; mostly Late Cretaceous dioritic to granodioritic plutons of the Idaho batholithic assemblage

Cretaceous plutons; intermediate; as granodiorite or diorite; probably includes unmapped older and younger crystalline bodies.
StateIdaho
NameIntermediate intrusions; mostly Late Cretaceous dioritic to granodioritic plutons of the Idaho batholithic assemblage
Geologic ageCretaceous
Original map labelKi; Ki?; Kii; KJi; Km; mig; pKi; Ti
CommentsKii represents relatively intermediate plutonic rocks, rich in plagioclase, or containing hornblende, as in tonalite, hornblende-biotite granodiorite, quartz diorite, or trondhjemite. Most Kii is in small plutons or zones near the margins of the composite Atlanta and Bitterroot lobes of the Idaho batholith. On map ID001, some Kii is included within large polygons of Ki undivided. Southwest of the Bitterroot batholith, the tonalitic orthogneiss pluton of Coolwater Ridge (ID150) is included in a polygon of mixed metaplutonic and metasedimentary rocks (ID001).
Primary rock typetonalite
Secondary rock typegranodiorite
Other rock typesquartz diorite; trondhjemite
Lithologic constituents
Major
Igneous > Plutonic > Granitic > Granodiorite (Pluton)potassium-rich hornblende-biotite granodiorite
Igneous > Plutonic > Granitic > Tonalite (Pluton)tonalite to quartz-diorite plutons near margins of Idaho batholith
Minor
Igneous > Plutonic > Dioritic > Quartz-diorite (Pluton)quartz diorite to tonalite plutons near margins of Idaho batholith
Incidental
Igneous > Plutonic > Granitic > Tonalite > Trondhjemite (Pluton)trondhjemite plutons or trondhjemitic zones in tonalitic plutons
Map references
Bond, J.G., Kauffman, J.D., Miller, D.A., and Venkatakrishnan, Ramesh, 1978, Geologic map of Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, with contributions from U.S. Geological Survey, scale 1:500,000.
Unit references
Bond, J.G., Kauffman, J.D., Miller, D.A., and Venkatakrishnan, Ramesh, 1978, Geologic map of Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, with contributions from U.S. Geological Survey, scale 1:500,000.
Toth, M.I., 1987, Petrology and origin of the Bitterroot lobe of the Idaho batholith: in Vallier, T.L., and Brooks, H.C., eds., Geology of the Blue Mountains region of Oregon, Idaho, and Washington: U.S. Geological Survey Professional Paper 1436, p. 9-35.
Lewis, R.S., Kiilsgaard, T.H., Bennett, E.H., and Hall, W.E., 1987, Lithologic and chemical characteristics of the central and southeastern part of the southern lobe of the Idaho batholith: in Vallier, T.L., and Brooks, H.C., eds., Geology of the Blue Mountains region of Oregon, Idaho, and Washington: U.S. Geological Survey Professional Paper 1436, p. 9-35.
Rember, W.C., and Bennett, E.H., 1979, Geologic map of the Hamilton quadrangle, Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, Geologic Map Series, Hamilton 2o quadrangle, 1:250,000 scale.
Worl, R.G., Kiilsgaard, T.H., Bennett, E.H., Link, P.K., Lewis, R.S., Mitchell, V.E., Johnson, K.M., and Snyder, L.D., 1991, Geologic map of the Hailey 1o x 2o quadrangle, Idaho: U.S. Geological Survey Open-File Report 91-340, 1:250,000 scale.
Lewis, R.S., 2003, Unpublished report on IGS digital geologic maps in preparation, north-central Idaho: Moscow, Idaho, Idaho Geological Survey, 1:100,000 scale.
Nold, J.L., 1968, Geology of the northeastern border zone of the Idaho batholith, Montana and Idaho: Ann Arbor, Michigan, University Microfilms International, Missoula, Montana, University of Montana, Ph.D. thesis, 159 p., 2 maps, 1:48,000 scale.
Geographic coverageAdams - Blaine - Camas - Clearwater - Elmore - Idaho - Latah

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