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Insight into multi-step geological evolution of C-type asteroids from Ryugu particles

Journal Article · · Nature Astronomy
 [1];  [2];  [2];  [3];  [4];  [5];  [6];  [7];  [8];  [9];  [1];  [10];  [9];  [11];  [11];  [12];  [13];  [14];  [15];  [15] more »;  [11];  [11];  [11];  [11];  [11];  [16];  [11];  [11];  [11];  [11];  [11];  [11];  [15];  [17] « less
  1. National Institute of Polar Research (NIPR) (Japan); Graduate University for Advanced Studies (SOKENDAI) (Japan)
  2. Japan Agency for Marine-Earth Science and Technology (Japan)
  3. Tokyo Metropolitan University (Japan); Kanagawa Univ. (Japan)
  4. National Institute of Polar Research (NIPR) (Japan)
  5. Open University (United Kingdom)
  6. Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Univ. of California, Los Angeles, CA (United States)
  7. NASA Johnson Space Center, Houston, TX (United States); Univ. of California, Los Angeles, CA (United States)
  8. Univ. of California, Los Angeles, CA (United States)
  9. Japan Synchrotron Radiation Research Institute, Sayo, Hyogo (Japan)
  10. Institute for Molecular Science (IMS), Okazaki, Aichi (Japan); High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)
  11. Japan Aerospace Exploration Agency (ISAS/JAXA), Sagamihara, Kanagawa (Japan). Institute of Space and Astronautical Science
  12. Institute for Molecular Science (IMS), Okazaki, Aichi (Japan)
  13. Toyo Corporation, Tokyo (Japan); Marine Works Japan, Ltd. (Japan)
  14. Osaka Univ. (Japan)
  15. Nagoya Univ. (Japan)
  16. Kanagawa Institute of Technology (Japan)
  17. Graduate University for Advanced Studies (SOKENDAI) (Japan); Japan Aerospace Exploration Agency (ISAS/JAXA), Sagamihara, Kanagawa (Japan). Institute of Space and Astronautical Science
C-type asteroids are the source of the carbonaceous chondrite meteorites and represent remnants of primitive planetesimals that formed at the outer margins of the early Solar System and may have delivered volatiles to the inner Solar System, in particular the early Earth. However, the nature of carbonaceous chondrites is not well understood owing to terrestrial alteration. Here, in this work, we present the petrology and mineral chemistry of surface materials collected by the Japan Aerospace Exploration Agency (JAXA) Hayabusa2 spacecraft from the C-type asteroid Ryugu. The Ryugu particles we studied are similar to CI (Ivuna-type) chondrites but with some important differences, such as the presence of Na–Mg phosphates and Na-rich phases and the lack of ferrihydrite and gypsum. Ryugu particles experienced several steps of aqueous alteration, metasomatism and brecciation under variable conditions. These materials represent mixed lithologies and formed at different locations within their parent asteroid. The evidence presented here demonstrates that the C-type asteroid Ryugu experienced a complex geologic evolution shortly after its formation.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
2006763
Report Number(s):
LLNL--JRNL-846894; 1071335
Journal Information:
Nature Astronomy, Journal Name: Nature Astronomy Journal Issue: 4 Vol. 7; ISSN 2397-3366
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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