Iridium in some calcic and calc-alkalic batholithic rocks of the western United States
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Abstract
Neutron-activation determinations of Ir in rocks of the Southern California and Boulder (Montana) batholiths show that the Ir content is low and variable in both batholiths, extending over 1 to 2 orders of magnitude and having a combined median of 0.006 ppb Ir. The data suggest that the calc-alkalic Boulder batholith (0.002–0.5 ppb Ir, median 0.007) may be slightly enriched in Ir relative to the calcic Southern California batholith (< 0.001–0.12 ppb Ir, median 0.005). No conspicuous relationship between Ir content and differentiation parameters is evident; however, the Boulder batholith rocks do show a slight tendency to concentrate Ir in the more mafic rocks. Our results in conjunction with previous analyses of mafic rocks leads to a crustal-abundance estimate of 0.03 ppb Ir
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Iridium in some calcic and calc-alkalic batholithic rocks of the western United States |
| Series title | Chemical Geology |
| DOI | 10.1016/0009-2541(74)90101-6 |
| Volume | 14 |
| Issue | 1-2 |
| Year Published | 1974 |
| Language | English |
| Publisher | Elsevier |
| Description | 6 p. |
| First page | 117 |
| Last page | 122 |
| Country | United States |
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