K-Ar ages and time span of emplacement of the Boulder Batholith, Montana

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ID: 294133
1968
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Abstract
K-Ar ages of biotite and hornblende from the batholith and satellite masses range from 78 to 68 m.y. The emplacement could have taken as little as 5 m.y. (76-71 m.y.). Even though isotopic dates generally support field evidence for the intrusion sequence, reduction of K-Ar dates of older rocks in the vicinity of younger plutons is suspected. Making certain assumptions, the total emplacement time may have been about 9 m.y., and the bulk of the batholith was probably emplaced during the first 6 m.y. The youngest prebatholith rocks, the Elkhorn Mts. volcanics, are about 78 m.y. but may be slightly older. If so, the total emplacement time could even be as great as 10 to 12 m.y.
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Authors Robert I. Tilling, M.R. Klepper, John D. Obradovich
Journal american journal of science
Year 1968
DOI
10.2475/ajs.266.8.671
URL
https://ajs.scholasticahq.com/article/59263.pdf
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