Portland State University. Department of Earth Sciences
Term of Graduation
Date of Publication
Master of Science (M.S.) in Earth Science
Chlorine, Batholiths -- Idaho
1 online resource (2, v, 82 pages)
Chlorine is thought to play a major role in the mobilization and concentration of base metals in the formation of ore deposits. The regional distribution of chlorine in the Idaho Batholith was studied to see if this could be related to mineralization or metallic provinces. One hundred forty-eight whole-rock samples, mineral separates, and standards were analyzed for chlorine by x-ray fluorescence.
The expected concentration of chlorine in the biotite fraction was not found. The chlorine was not significantly water leachable from the whole rock samples following normal grinding. The Idaho Batholith as a source for mineralizing chlorine was not established.
The chlorine distribution supports, but does not prove, a metamorphic origin for the Idaho Batholith. Cretaceous and possibly tertiary thermal events may have homogenized the chlorine in the batholith. Since chlorine seems to be so widely available in source rocks, a better way to correlate its presence to mineralization would be to study the residual chlorine from the ore deposition process.
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Istas, Laurence Stewart, "Chlorine Distribution in the Idaho Batholith" (1976). Dissertations and Theses. Paper 2611.