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- W2120223876 abstract "Knowledge of the outgassing history of radiogenic 40 Ar, derived over geologic time from the radioactive decay of 40 K, contributes to our understanding of the geodynamic history of the planet and the origin of volatiles on Earth's surface. The 40 Ar inventory of the atmosphere equals total 40 Ar outgassing during Earth history. Here, we report the current rate of 40 Ar outgassing, accessed by measuring the Ar isotope composition of trapped gases in samples of the Vostok and Dome C deep ice cores dating back to almost 800 ka. The modern outgassing rate (1.1 ± 0.1 × 10 8 mol/yr) is in the range of values expected by summing outgassing from the continental crust and the upper mantle, as estimated from simple calculations and models. The measured outgassing rate is also of interest because it allows dating of air trapped in ancient ice core samples of unknown age, although uncertainties are large (±180 kyr for a single sample or ±11% of the calculated age, whichever is greater)." @default.
- W2120223876 created "2016-06-24" @default.
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- W2120223876 date "2008-06-17" @default.
- W2120223876 modified "2023-10-02" @default.
- W2120223876 title "The contemporary degassing rate of <sup>40</sup> Ar from the solid Earth" @default.
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- W2120223876 doi "https://doi.org/10.1073/pnas.0711679105" @default.
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