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Fig. 2 40Ar/39Ar age bias as a function of grain geometry for D-D fusion neutron or fission neutron–irradiated minerals. 40Ar/39Ar age bias as a function of grain geometry for D-D fusion neutron or fission neutron–irradiated minerals. Positive age bias of high SAV biotite grains irradiated with fission neutrons is interpreted to represent recoil-related 39Ar loss [data points are partially shown as means and envelope only; (7)]. Negative age bias of a sanidine-plagioclase mixture is interpreted to reflect undercorrection of 36ArCa (12). Biotite grains (7) were irradiated separately, while sanidine fractions [this study and (12)] were irradiated with multiple grains in contact, allowing potential reimplantation and decreasing apparent recoil. Daniel Rutte et al. Sci Adv 2019;5:eaaw5526 Copyright © 2019 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC).
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