Insight into multi-step geological evolution of C-type asteroids from Ryugu particles
Insight into multi-step geological evolution of C-type asteroids from Ryugu particles
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DOI：
10.1038/s41550-023-01925-x
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发表时间：
2023-03
期刊：
影响因子：
14.1
通讯作者：
A. Yamaguchi;N. Tomioka;M. Ito;N. Shirai;M. Kimura;R. Greenwood;Ming‐Chang Liu;K. McCain;N. Matsuda;M. Uesugi;N. Imae;T. Ohigashi;K. Uesugi;A. Nakato;K. Yogata;H. Yuzawa;Y. Kodama;K. Hirahara;I. Sakurai;I. Okada;Y. Karouji;S. Nakazawa;T. Okada;T. Saiki;S. Tanaka;F. Terui;M. Yoshikawa;Akiko Miyazaki;M. Nishimura;T. Yada;M. Abe;T. Usui;Sei‐ichiro Watanabe;Y. Tsuda
中科院分区：
文献类型：
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作者：
A. Yamaguchi;N. Tomioka;M. Ito;N. Shirai;M. Kimura;R. Greenwood;Ming‐Chang Liu;K. McCain;N. Matsuda;M. Uesugi;N. Imae;T. Ohigashi;K. Uesugi;A. Nakato;K. Yogata;H. Yuzawa;Y. Kodama;K. Hirahara;I. Sakurai;I. Okada;Y. Karouji;S. Nakazawa;T. Okada;T. Saiki;S. Tanaka;F. Terui;M. Yoshikawa;Akiko Miyazaki;M. Nishimura;T. Yada;M. Abe;T. Usui;Sei‐ichiro Watanabe;Y. Tsuda
c型小行星是碳质球粒陨石的来源，代表了早期太阳系外边缘形成的原始星子的残余物，可能向太阳系内部，特别是早期地球输送了挥发物。然而，由于地球的蚀变，碳质球粒陨石的性质尚不清楚。在这里，我们展示了由日本宇宙航空研究开发机构（JAXA）隼鸟2号宇宙飞船从c型小行星龙宫收集的表面材料的岩石学和矿物化学。我们研究的Ryugu颗粒与CI （ivuna型）球粒陨石相似，但存在一些重要的差异，例如存在Na-Mg磷酸盐和富na相，缺乏铁水合物和石膏。琉球颗粒在不同条件下经历了水蚀变、交代和角化的几个步骤。这些物质代表了混合的岩性，在它们的母小行星的不同位置形成。这里提供的证据表明，c型小行星龙宫在形成后不久经历了复杂的地质演化。
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, 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.