Areal distribution and geophysical significance of heat generation in the Idaho batholith and adjacent intrusions in eastern Oregon and western Montana

Basic Information
Author: Swanberg, C.A., Blackwell, D.D.
Description:Gamma ray spectrometry has been used to measure potassium (K), uranium (U), thorium (Th), heat generation (A), Th/U, and (A - Ak)/K (Ak = heat from potassium) for over 600 samples in the Idaho batholith. Values of heat generation are remarkably consistent within a given pluton, but vary markedly and predictably between plutons of different composition and(or) different levels of emplacement. Values of (A - Ak)/K are similar for suites of rocks that were emplaced at approximately the same depth during the same intrusive event, but are considerably different between suites belonging to different intrusive events emplaced at different depths. Thus, on the basis of their (A - Ak)/K ratio and various geologic parameters, the rocks of the Idaho batholith can be divided into four intrusive groups. Table 1 lists these groups with their characteristics, weighted according to areal abundances of the constituent plutons. For more information on this resource, please see the link provided.
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Author Contact Information
Distributor Contact Information
Organization Name: University of Idaho
Street: Morrill Hall, University of Idaho
City: Moscow
State: ID
Zip: 83844-3014
Phone: 208-885-7991
Geographic Extent
North Bounding Latitude: 49
South Bounding Latitude: 42
East Bounding Longitude: -111
West Bounding Longitude: -117.25