Formation and evolution of carbonaceous asteroid Ryugu: Direct evidence from returned samples
Formation and evolution of carbonaceous asteroid Ryugu: Direct evidence from returned samples
复制标题
DOI：
10.1126/science.abn8671
复制
发表时间：
2023-02-24
期刊：
影响因子：
56.9
通讯作者：
Tsuda, Y.
中科院分区：
文献类型：
--
作者：
Nakamura, T.;Matsumoto, M.;Tsuda, Y.
由Hayabusa2号航天器携带的碳质小行星琉球样本被带到了地球。我们分析了17个直径为1至8毫米的琉球样本。在磁黄铁矿晶体中存在含二氧化碳的水包裹体，这表明琉球的母行星是在外太阳系形成的。这些样品含有在高温下形成的低丰度物质，如球粒陨石和富钙铝包裹体。样品富含层状硅酸盐和碳酸盐，它们是在低温、高pH和水/岩比较低的情况下通过水蚀变反应形成的。
Samples of the carbonaceous asteroid Ryugu were brought to Earth by the Hayabusa2 spacecraft. We analyzed 17 Ryugu samples measuring 1 to 8 millimeters. Carbon dioxide-bearing water inclusions are present within a pyrrhotite crystal, indicating that Ryugu's parent asteroid formed in the outer Solar System. The samples contain low abundances of materials that formed at high temperatures, such as chondrules and calcium- and aluminum-rich inclusions. The samples are rich in phyllosilicates and carbonates, which formed through aqueous alteration reactions at low temperature, high pH, and water/rock ratios of