Wasserburg, G. J. and Hayden, R. J. and Jensen, Kenneth J. (1956) A⁴⁰-K⁴⁰ dating of igneous rocks and sediments. Geochimica et Cosmochimica Acta, 10 (3). pp. 153-165. ISSN 0016-7037. doi:10.1016/0016-7037(56)90041-2. https://resolver.caltech.edu/CaltechAUTHORS:20221111-678968900.5
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Abstract
The discrepancy in A⁴⁰/K⁴⁰ ratios between micas and feldspars reported by Wetherill has been confirmed. Assuming no A⁴⁰ to be inherited by potassium minerals, a branching ratio of 0.113 is calculated from dated mica samples. This implies that the micas investigated have retained 85% or more of their argon. The branching ratio of R = 0.085 is interpreted to be an empirical calibration constant which corrects for argon loss. The A⁴⁰/K⁴⁰ ratios in four authigenic minerals have been determined and the ages are found to be in reasonable agreement with the times assigned to the geologic periods by Holmes.
| Item Type: | Article | ||||||
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| Alternate Title: | A40-K40 dating of igneous rocks and sediments | ||||||
| Additional Information: | This work was supported in part by AEC contract number AT(11-1)-101, and in part by a grant-in-aid from the American Petroleum Institute. | ||||||
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| Issue or Number: | 3 | ||||||
| DOI: | 10.1016/0016-7037(56)90041-2 | ||||||
| Record Number: | CaltechAUTHORS:20221111-678968900.5 | ||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20221111-678968900.5 | ||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||
| ID Code: | 117838 | ||||||
| Collection: | CaltechAUTHORS | ||||||
| Deposited By: | Tony Diaz | ||||||
| Deposited On: | 17 Nov 2022 22:58 | ||||||
| Last Modified: | 17 Nov 2022 22:58 |
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