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Geothermal gradients in the Missoula and Bitterroot Valleys, west-central Montana

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Geothermal gradients in the Missoula and Bitterroot Valleys, west-central Montana; 1980; WRI; 80-89; Leonard, Robert B.; Wood, Wayne A.

Summary

Temperature-depth profiles of six cased test holes in the Missoula and Bitterroot Valleys, west-central Montana, consist of linear segments, the intersections of which commonly correspond with lithologic boundaries. Geothermal gradients commonly decreased with depth, probably as a result of compaction and higher quartz content of the deeper sedimentary deposits. There is no evidence for hydrothermal discharge. A maximum temperature of 31.7 degrees Celsius was measured at a depth of 869 meters. Estimated temperatures at a depth of 1 kilometer at the drill sites ranged from about 34 to 63 degrees Celsius. Temperatures exceeding 90 degrees Celsius probably would not occur at depths less than 1,500 meters. Values of thermal conductivity [...]

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  • USGS contributions to the National Geothermal Data System

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Type Scheme Key
local-index unknown wri8089
local-pk unknown 28322
series unknown Water-Resources Investigations Report

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journalWater-Resources Investigations Report
edition-
languageENGLISH
citationTypeReport

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