A reconnaissance of the Idaho batholith and comparison with the southern California batholith
1958
Abstract
The Idaho batholith and included inliers of older rocks underlie an area of about 16,000 square miles.The average rock is intermediate between a quartz monzonite and a granodiorite.The average rock of the southern California batholith is a tonalite.The Idaho batholith has very little gabbro and contains much more quartz monzonite than the California batholith.The individual bodies of a single kind of rock are much larger in the Idaho batholith than in the southern California batholith.The two batholiths fall very near the same variation curves, are about 108 million years old (middle part of the Cretaceous), and are believed to have been emplaced chiefly by magmatic injection.
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