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• W2962735525 startingPage "9091" @default.
• W2962735525 abstract "Abstract We report 40 Ar‐ 39 Ar step‐heating ages of Paleocene‐Eocene (P‐E) boundary impact spherules from Atlantic Margin coastal plain and open ocean sites. We test the hypothesis that the P‐E spherules are reworked from an earlier event (e.g., K‐Pg impact at ~66 Ma), which predicts a cooling age discordant from their depositional age of 55.93 ± 0.05 Ma at the P‐E boundary. Isochrons from the step‐heating analysis yield 40 Ar‐ 36 Ar intercepts in excess of the modern in most cases, indicating that the spherules have excess radiogenic Ar ( 40 Ar*), typical of impact glasses incompletely degassed before solidification. The weighted mean of the isochron‐corrected plateau age is 54.2 ± 2.5 Ma (1σ), and their isochron age is 55.4 ± 4.0 Ma, both indistinguishable from their P‐E depositional age, not supporting the K‐Pg reworking hypothesis. This is consistent with all other stratigraphic and geochemical evidence for an impact at the P‐E boundary and ejecta distribution by air fall." @default.
• W2962735525 created "2019-07-30" @default.
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• W2962735525 date "2019-08-09" @default.
• W2962735525 modified "2023-09-26" @default.
• W2962735525 title "Initial ⁴⁰ Ar‐ ³⁹ Ar Ages of the Paleocene‐Eocene Boundary Impact Spherules" @default.
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• W2962735525 doi "https://doi.org/10.1029/2019gl082473" @default.
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