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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, and Ko Hashizume

2022 The Astrophysical Journal Letters 924 L16.

  • Provider: AAS Journals

Caption: Figure 4.

Thermal history of the Jbilet Winselwan parent body. The white and black lines show the contour lines of 273 K (0°C) and 343 K (70°C), respectively, representing the range of the calcite formation temperatures. The white dots show 10 km (horizontal) and 1 Myr (vertical) intervals. The formation ages of Jbilet Winselwan (JW) calcites (this study) and CM carbonates (Fujiya et al. 2012) are shown by arrows. The white line demonstrates that the aqueous alteration in the inner regions initiated ∼0.3 Myr after the planetesimal formation, while the aqueous alteration in the outer regions delays by up to 1 Myr. CM calcites likely precipitated in the earliest stage of aqueous alteration under low temperatures of 0°C–70°C (between white and black lines). Thus, Jbilet Winselwan may be derived from the inner regions of the parent body while unheated CMs chondrites can also be produced in the outer regions of the same parent body.

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