Climate Change Data Portal
| DOI | 10.1038/s41561-022-00914-5 |
| Crater population on asteroid (101955) Bennu indicates impact armouring and a young surface | |
| Bierhaus E.B.; Trang D.; Daly R.T.; Bennett C.A.; Barnouin O.S. | |
| 发表日期 | 2022 |
| ISSN | 1752-0894 |
| 起始页码 | 440 |
| 结束页码 | 446 |
| 卷号 | 15期号:6 |
| 英文摘要 | The impactor-to-crater size scaling relationships that enable estimates of planetary surface ages rely on an accurate formulation of impactor–target physics. An armouring regime, specific to rubble-pile surfaces, has been proposed to occur when an impactor is comparable in diameter to a target surface particle (for example, a boulder). Armouring is proposed to reduce crater diameter, or prevent crater formation in the asteroid surface, at small crater diameters. Here, using measurements of 1,560 craters on the rubble-pile asteroid (101955) Bennu, we show that the boulder population controls a transition from crater formation to armouring at crater diameters ~2–3 m, below which crater formation in the bulk surface is increasingly rare. By combining estimates of impactor flux with the armouring scaling relationship, we find that Bennu’s crater retention age (surface age derived from crater abundance) spans from 1.6–2.2 Myr for craters less than a few meters to ~10–65 Myr for craters >100 m in diameter, reducing the maximum surface age by a factor of >15 relative to previous estimates. The range of crater retention ages, together with latitudinal variations in large-crater spatial density, indicate that ongoing resurfacing processes render the surface many times younger than the bulk asteroid. © 2022, The Author(s), under exclusive licence to Springer Nature Limited. |
| 语种 | 英语 |
| scopus关键词 | asteroid; crater; estimation method; latitudinal gradient; planetary surface |
| 来源期刊 | Nature Geoscience
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/262198 |
| 作者单位 | Lockheed Martin Space, Littleton, CO, United States |
| 推荐引用方式 GB/T 7714 | Bierhaus E.B.； Trang D.； Daly R.T.； Bennett C.A.； Barnouin O.S.；. Crater population on asteroid (101955) Bennu indicates impact armouring and a young surface[J],2022,15(6). |
| APA | Bierhaus E.B.； Trang D.； Daly R.T.； Bennett C.A.； Barnouin O.S.；.(2022).Crater population on asteroid (101955) Bennu indicates impact armouring and a young surface.Nature Geoscience,15(6). |
| MLA | Bierhaus E.B.； Trang D.； Daly R.T.； Bennett C.A.； Barnouin O.S.；."Crater population on asteroid (101955) Bennu indicates impact armouring and a young surface".Nature Geoscience 15.6(2022). |
| 条目包含的文件 | 条目无相关文件。 | |||||
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。
