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Syenite, monzonite, quartz syenite; Late to Early Cretaceous syenitic intrusions; northern Idaho

Cretaceous syenitic to monzonitic intrusions
StateIdaho
NameSyenite, monzonite, quartz syenite; Late to Early Cretaceous syenitic intrusions; northern Idaho
Geologic ageCretaceous
Original map labelKif; Ki?
CommentsKis of the Gem stocks includes porphyritic monzonite, monzonite, quartz alkali-feldspar syenite, and mafic syenite. Age determinations from the Gem stocks range widely from 94 Ma to 136 Ma (Early to Late Cretaceous, and older than the Idaho batholith), (ID148). Kis of the Gold Hill stock is hornblende syenite (ID110).
Primary rock typesyenite
Secondary rock typemonzonite
Other rock typesquartz syenite; alkali syenite
Lithologic constituents
Major
Igneous > Plutonic > Syenitic > Syenite (Pluton)hornblende syenite, mafic syenite
Minor
Igneous > Plutonic > Syenitic > Monzonite (Pluton)biotite monzonite, porphyritic monzonite
Incidental
Igneous > Plutonic > Syenitic > Alkali-feldspar-syenite (Pluton)leucocratic alkali-feldspar syenite
Igneous > Plutonic > Syenitic > Quartz-alkali-feldspar-syenite (Pluton)quartz alkali-feldspar syenite
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.
Rember, W.C. and Bennett, E.H., 1979, Geologic map of the Pullman quadrangle, Idaho: Moscow, Idaho, Idaho Bureau of Mines and Geology, Geologic Map Series, Pullman 2o Quadrangle, scale 1:250,000.
Schalck, D.K., 1989, The geology and alteration of the Gem stocks, Shoshone County, Idaho: in V.E. Chamberlain, R.M. Breckenridge, and Bill Bonnichsen, eds., Guidebook to the Geology of Northern and Western Idaho and Surrounding Areas: Moscow, Idaho, Idaho Geological Survey Bulletin 28, p. 125-135.
Geographic coverageLatah - Shoshone

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