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Evidence for a ∼ 4.5 aeon age of plagioclase clasts in a lunar highland breccia

Jessberger, E. K. and Huneke, J. C. and Wasserburg, G. J. (1974) Evidence for a ∼ 4.5 aeon age of plagioclase clasts in a lunar highland breccia. Nature, 248 (5445). pp. 199-202. ISSN 0028-0836. doi:10.1038/248199a0.

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Argon from neutron-irradiated mineral separates and whole rock samples of a metamorphosed breccia (65015) from Apollo 16 has been analysed with a large number of gas extraction steps in order to obtain a high resolution in the apparent ages and to identify the gas released from different sources. The results on plagioclase show a ⁴⁰Ar–³⁹Ar plateau age of 3.98 × 10⁹ yr, which we attribute to the time of metamorphism, and an age of ∼ 4.5 × 10⁹ yr in the high temperature fraction. Correlation of the release pattern with ³⁷Ar instead of ³⁹Ar permits the association of the ∼4.5 × 10⁹ yr age with relict plagioclasts which were demonstrated in previous petrographic and Rb-Sr studies as being unequilibrated. This result suggests that it is possible to identify lithic components which represent the early lunar crust.

Item Type:Article
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Wasserburg, G. J.0000-0002-7957-8029
Additional Information:We acknowledge aid from F. A. Podosek in data analysis. This work was supported by NASA. The United States National Research Council and the Bundesministerium für Forschung und Technologie (BRD) also provided financial support for E. K. Jessberger.
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National Research CouncilUNSPECIFIED
Bundesministerium für Forschung und Technologie (BMFT)UNSPECIFIED
Issue or Number:5445
Record Number:CaltechAUTHORS:20221129-218507500.3
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:118097
Deposited By: Tony Diaz
Deposited On:07 Dec 2022 18:59
Last Modified:07 Dec 2022 18:59

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