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Hydrothermal Activities on C-Complex Asteroids Induced by Radioactivity

• Authors: Wataru Fujiya, Hisato Higashi, Yuki Hibiya, Shingo Sugawara, Akira Yamaguchi, Makoto Kimura, Ko Hashizume

Wataru Fujiya et al 2022 The Astrophysical Journal Letters 924 .

• Provider: AAS Journals

Caption: Figure 2.

Results of the 53Mn–53Cr dating of Jbilet Winselwan calcites. (A) Isochron diagram showing 55Mn/52Cr ratios vs. δ53Cr values (δ53Cr denotes permil deviation of 53Cr/52Cr ratios from the terrestrial standard value). The individual data points show a linear correlation, corresponding to the initial 53Mn/55Mn ratio, (53Mn/55Mn)0, of (4.51 ± 1.06) × 10−6. Note that the intercept of the y-axis is fixed to zero. (B) Chromium contamination plot showing 1/52Cr vs. δ53Cr values. The observed correlation appears worse than that in the isochron diagram as shown by their mean squared weighted deviation (MSWD) values. Thus, it is likely that the linear correlation in the isochron diagram provides chronological information and is not produced by the mixing between a 53Cr-rich component and contamination with the terrestrial Cr isotopic composition (δ53Cr = 0) without any chronological information. (C) Comparison between the formation ages of Jbilet Winselwan and unheated CM chondrites (Fujiya et al. 2012). The age of the Flensburg unique C1 chondrite is also shown (Bischoff et al. 2021). The gray band shows the weighted average of the unheated CM chondrites with the 2σ error. CAI shows the age of solar system formation (4567.3 Ma).