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- W183485443 abstract "There are about six major groups of volcanic rocks in the San Juan region, separated by extesenive erosion several subgroups, separated by a sharp break in ks range from basalts and trachydolerites to rhyolites. The predominant rock type is dark quartz latite; light colored quartz latites and rhyolites are nearly as abundant. of these rocks. The trachydolerites carry approximately 1.3 ppm of uranium which is about the average, or a little higher than the average for such rocks. The es ranges from 2.2 to 3.0 ppm which is high for such rocks. The light and the rhyolites 5.8 ppm of uranium. This amount is close to the average content for such rocks, and is comntrusive rocks of the southern California batholith. The weighted average than in granitic rocks in the Sierra Nevada batholith. Study of the distribution of uranium in the different minerals of a rhyolite containing 6.6 ppm uranium showed that more than 90 percent of the uranium is in the groundmass. Although the accessory minerals, zircon and sphene, are relatively high in uranium content (800 to 71 ppm, respectively) they are present in amounts too small to contribute significantly to the total uranium content of the rock. (auth)" @default.
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- W183485443 date "1958-10-31" @default.
- W183485443 modified "2023-09-27" @default.
- W183485443 title "DISTRIBUTION OF URANIUM IN THE VOLCANIC ROCKS OF THE SAN JUAN MOUNTAINS, SOUTH-WESTERN COLORADO" @default.
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