| 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. ?? 1974. |
| Genre: | Article |
| ProdID: | 70010969 |
| Citation Author: | Greenland, L. P.; Gottfried, D.; Tilling, R. I. |
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| Citation End Page: | 122 |
| Citation Issue: | 1-2 |
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| Citation Language: | English |
| Citation Larger Work Title: | Chemical Geology |
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| Citation Number Of Pages: | 6 |
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| Citation Publisher: | Elsevier |
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| Citation Search Results Text: | Iridium in some calcic and calc-alkalic batholithic rocks of the western United States; 1974; Article; Journal; Chemical Geology; Greenland, L. P.; Gottfried, D.; Tilling, R. I. |
| Citation Start Page: | 117 |
| Citation Volume: | 14 |
| Citation Year: | 1974 |
| Type: | citation/reference |
| Text: | Iridium in some calcic and calc-alkalic batholithic rocks of the western United States; 1974; Article; Journal; Chemical Geology; Greenland, L. P.; Gottfried, D.; Tilling, R. I. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1016/0009-2541(74)90101-6 |
| Date Other: | Tue, 1 Jan 1974 00:00 -0600 |
| Publisher: | Elsevier |
