Microstructural and chemical features of impact melts on Ryugu particle surfaces: Records of interplanetary dust hit on asteroid Ryugu-Reference-Cited by-同舟云学术

Microstructural and chemical features of impact melts on Ryugu particle surfaces: Records of interplanetary dust hit on asteroid Ryugu

Published:2024-01-19 Issue:3 Volume:10 Page:
ISSN:2375-2548
Container-title:Science Advances
language:en
Short-container-title:Sci. Adv.

Author:

Matsumoto Megumi¹^ORCID,Matsuno Junya²^ORCID,Tsuchiyama Akira²³⁴^ORCID,Nakamura Tomoki¹^ORCID,Enokido Yuma¹^ORCID,Kikuiri Mizuha¹,Nakato Aiko⁵^ORCID,Yasutake Masahiro⁶,Uesugi Kentaro⁶^ORCID,Takeuchi Akihisa⁶^ORCID,Enju Satomi⁷,Okumura Shota⁸,Mitsukawa Itaru⁸^ORCID,Sun Mingqi³⁴^ORCID,Miyake Akira⁸^ORCID,Haruta Mitsutaka⁹^ORCID,Igami Yohei⁸^ORCID,Yurimoto Hisayoshi¹⁰^ORCID,Noguchi Takaaki⁸^ORCID,Okazaki Ryuji¹¹^ORCID,Yabuta Hikaru¹²^ORCID,Naraoka Hiroshi¹¹^ORCID,Sakamoto Kanako⁵^ORCID,Tachibana Shogo¹³^ORCID,Zolensky Michael¹⁴^ORCID,Yada Toru⁵^ORCID,Nishimura Masahiro⁵^ORCID,Miyazaki Akiko⁵^ORCID,Yogata Kasumi⁵^ORCID,Abe Masanao⁵^ORCID,Okada Tatsuaki⁵^ORCID,Usui Tomohiro⁵^ORCID,Yoshikawa Makoto⁵^ORCID,Saiki Takanao⁵^ORCID,Tanaka Satoshi⁵^ORCID,Terui Fuyuto¹⁵^ORCID,Nakazawa Satoru⁵^ORCID,Watanabe Sei-ichiro¹⁶^ORCID,Tsuda Yuichi⁵^ORCID

Affiliation:

1. Department of Earth and Planetary Materials Sciences, Tohoku University, Miyagi 980-8578, Japan.

2. Research Organization of Science and Technology, Ritsumeikan University, Shiga 525-8577, Japan.

3. Chinese Academy of Sciences (CAS) Key Laboratory of Mineralogy and Metallogeny/Guangdong Provincial Key Laboratory of Mineral Physics and Materials, Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640, China.

4. CAS Center for Excellence in Deep Earth Science, Guangzhou 510640, China.

5. Institute of Space and Astronautical Science (ISAS), Japan Aerospace Exploration Agency (JAXA), Sagamihara 252-5210, Japan.

6. Research and Utilization Division, Japan Synchrotron Radiation Research Institute (JASRI/SPring-8), Hyogo 679-5198, Japan.

7. Earth’s Evolution and Environment Course, Department of Mathematics, Physics, and Earth Science, Ehime University, Ehime 790-8577, Japan.

8. Division of Earth and Planetary Sciences, Kyoto University, Kyoto 606-8502, Japan.

9. Institute for Chemical Research, Kyoto University, Gokasho, Uji, Kyoto 611-0011, Japan.

10. Department of Natural History Sciences, Hokkaido University, Sapporo 060-0810, Japan.

11. Department of Earth and Planetary Sciences, Kyushu University, Fukuoka 819-0395, Japan.

12. Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-HiroshimaHiroshima 739-8526, Japan.

13. Department of Earth and Planetary Science, The University of Tokyo, Tokyo 113-0033, Japan.

14. NASA Johnson Space Center, Houston, TX 77058, USA.

15. Department of Mechanical Engineering, Kanagawa Institute of Technology, Atsugi 243-0292, Japan.

16. Department of Earth and Environmental Sciences, Nagoya University, Nagoya 464-8601, Japan.

Abstract

The Hayabusa2 spacecraft delivered samples of the carbonaceous asteroid Ryugu to Earth. Some of the sample particles show evidence of micrometeoroid impacts, which occurred on the asteroid surface. Among those, particles A0067 and A0094 have flat surfaces on which a large number of microcraters and impact melt splashes are observed. Two impact melt splashes and one microcrater were analyzed to unveil the nature of the objects that impacted the asteroid surface. The melt splashes consist mainly of Mg-Fe–rich glassy silicates and Fe-Ni sulfides. The microcrater trapped an impact melt consisting mainly of Mg-Fe–rich glassy silicate, Fe-Ni sulfides, and minor silica-rich glass. These impact melts show a single compositional trend indicating mixing of Ryugu surface materials and impactors having chondritic chemical compositions. The relict impactor in one of the melt splashes shows mineralogical similarity with anhydrous chondritic interplanetary dust particles having a probable cometary origin. The chondritic micrometeoroids probably impacted the Ryugu surface during its residence in a near-Earth orbit.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

Link

https://www.science.org/doi/pdf/10.1126/sciadv.adi7203

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