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Incorporation of 16O-rich anhydrous silicates in the protolith of highly hydrated asteroid Ryugu

Journal Article · · Nature Astronomy
 [1];  [2];  [2];  [3];  [3];  [4];  [4];  [5];  [3];  [6];  [7];  [8];  [5];  [9];  [9];  [10];  [11];  [12];  [13];  [13] more »;  [9];  [9];  [14];  [9];  [9];  [15];  [16];  [9];  [9];  [9];  [9];  [9];  [13];  [14] « less
  1. Univ. of California, Los Angeles, CA (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of California, Los Angeles, CA (United States)
  3. National Institute of Polar Research (NIPR), Tokyo (Japan)
  4. Japan Agency for Marine-Earth Science and Technology, Nankoku, Kochi (Japan)
  5. SPring-8, Japan Synchrotron Radiation Research Institute (JSRRI), Sayo (Japan)
  6. Tokyo Metropolitan University, Hachioji, Tokyo (Japan); Kanagawa Univ., Yokohama, Kanagawa (Japan)
  7. National Institute of Natural Sciences (NINS), Okazaki (Japan). Institute for Molecular Sciences (IMS); High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)
  8. Open University, Milton Keynes (United Kingdom)
  9. Japan Aerospace Exploration Agency (ISAS/JAXA), Sagamihara, Kanagawa (Japan)
  10. National Institute of Natural Sciences (NINS), Okazaki (Japan). Institute for Molecular Sciences (IMS)
  11. Toyo Corporation, Kariya (Japan)
  12. Osaka Univ. (Japan)
  13. Nagoya Univ. (Japan)
  14. Japan Aerospace Exploration Agency (ISAS/JAXA), Sagamihara, Kanagawa (Japan); Univ. of Tokyo (Japan)
  15. Kanagawa Institute of Technology, Atsugi (Japan)
  16. Japan Aerospace Exploration Agency (ISAS/JAXA), Sagamihara, Kanagawa (Japan); Graduate University for Advanced Studies (SOKENDAI), Hayama (Japan)
+ Show Author Affiliations
The abundant phyllosilicate and carbonate minerals characterizing most of the returned particles from asteroid Ryugu suggest a history of extensive aqueous alteration on its parent body, similar to the rare mineralogically altered, but chemically primitive, CI (Ivuna-type) chondrite meteorites. Particle C0009 differs mineralogically from other Ryugu particles examined so far by containing anhydrous silicates at a level of ~0.5 vol%, and thus can help shed light on the unaltered original materials that constituted Ryugu’s protolith. In situ oxygen isotope measurements of the most Mg-rich olivine and pyroxene in C0009 reveal two populations of Δ17O: –25‰ to –15‰ and –8‰ to –3‰. The former and the latter populations correlate well with silicate morphologies similar to those seen in amoeboid olivine aggregates and chondrule phenocrysts, respectively, both of which are abundant in less aqueously altered carbonaceous chondrites. Here, this result also highlights the presence of olivine with Δ17O close to the solar value in either a CI chondrite or an asteroid with CI-chondrite characteristics, and provides strong evidence that amoeboid olivine aggregates and Mg-rich chondrules accreted into Ryugu’s protolith. Our data also raise the possibility that the protoliths of CI and other carbonaceous chondrites incorporated similar anhydrous silicates.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); Japan Society for the Promotion of Science (JSPS)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1889532
Report Number(s):
LLNL-JRNL-839113; 1059879
Journal Information:
Nature Astronomy, Journal Name: Nature Astronomy Journal Issue: 10 Vol. 6; ISSN 2397-3366
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

58 GEOSCIENCES
79 ASTRONOMY AND ASTROPHYSICS
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