Jicha. Brian R. Brad S. Singer Wes Hildreth Nathan L. Andersen 2017 <p><span>Recent improvements in analytical and microsampling techniques for multiple geochronometers have resulted in datasets with unprecedented temporal and spatial resolution. These advances are accompanied by the discovery of crystal- and outcrop-scale complexities previously obscured by low analytical precision. Single-crystal incremental heating resolves subtle, intracrystal isotopic heterogeneity, allowing for more-accurate&nbsp;</span>⁴⁰<span>Ar/</span>³⁹<span>Ar eruption ages. The eruption ages of widespread volcanic ash deposits are critical for calibrating the geologic timescale, and thus their accuracy has substantial implications for the geologic, biologic, and global climate records. Complex distribution of&nbsp;</span>⁴⁰<span>Ar/</span>³⁹<span>Ar dates in the deposits of supervolcanic eruptions requires rethinking the magmatic processes and their effect on the&nbsp;</span>⁴⁰<span>Ar/</span>³⁹<span>Ar system, specifically the extent of cooling and remobilization during the decades to centuries preceding these events.</span></p> application/pdf 10.1073/pnas.1709581114 en National Academy of Sciences (NAS) Incremental heating of Bishop Tuff sanidine reveals preeruptive radiogenic Ar and rapid remobilization from cold storage article