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Fig. 4 | Earth, Planets and Space

Fig. 4

From: 40Ar/39Ar and cosmic ray exposure ages of plagioclase-rich lithic fragments from Apollo 17 regolith, 78461

Fig. 4

40Ar/39Ar ages of plagioclase-rich lithic fragments. 40Ar/39Ar ages of individual plagioclase-rich lithic fragments. The filled symbols represents the 40Ar/39Ar ages calculated after correcting measured 40Ar for non-radiogenic trapped component using (40Ar/36Ar)t = 0.146 (i.e., the y-intercept, Fig. 3). The open symbols represents 40Ar/39Ar ages calculated without any correction in measured 40Ar for trapped contribution (e.g., Norman et al. 2006; Fernandes et al. 2013). The horizontal line represents the age of 4.13 ± 0.09 Ga, determined using the slope obtained in Fig. 3. The uncertainty shown for 40Ar/39Ar ages are 1σ

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