| Description |
viii, 45 leaves : illustrations ; 29 cm |
| Summary |
"The iodine and uranium concentrations in sedimentary rocks were measured by irradiating the samples in a neutron flux, radiochemically separating iodine, and [Beta]-counting the resulting activity. The values obtained for uranium are in good agreement with previous estimates of the uranium content in sedimentary rocks. The values obtained for iodine define a distribution pattern similar to that reported for chlorine and bromine, in contrast with the distribution pattern previously reported for iodine in sedimentary rocks. The concentrations of chlorine, bromine, iodine and uranium were determined in tektites, obsidians and impact glasses by neutron activation. The uranium content found in tektites is suggestive of an origin from material in the earth's lithosphere. However, the halogen content is lower than that in obsidians or impactites, and lower than the halogen content reported in any terrestrial rocks. It is concluded that severe loss of halogens would be required for the production of tektites from terrestrial material. A similarity observed in the abundance pattern for the halogens in tektites and in impactites is interpreted as evidence that these two glasses could be derived from the same parent material"--Abstract, leaf iii. |
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