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A⁴⁰-K⁴⁰ dating of igneous rocks and sediments

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.

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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.

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Wasserburg, G. J.0000-0002-7957-8029
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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Atomic Energy CommissionAT(11-1)-101
American Petroleum InstituteUNSPECIFIED
Issue or Number:3
Record Number:CaltechAUTHORS:20221111-678968900.5
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:117838
Deposited By: Tony Diaz
Deposited On:17 Nov 2022 22:58
Last Modified:17 Nov 2022 22:58

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