月球小型陨石坑的喷出岩毯

IF 3.8 Q2 ASTRONOMY & ASTROPHYSICS The Planetary Science Journal Pub Date : 2024-05-12 DOI:10.3847/psj/ad3827
Trevor Austin, Mark Robinson and Prasun Mahanti
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引用次数: 0

摘要

撞击产生的喷出物覆盖了月球表面的大部分区域,从最近的撞击一直到地质记录的开始。尽管喷出物非常常见,但很难获得喷出物厚度的精确测量,而且现有的喷出物厚度估计值差异很大。本研究利用米级撞击对千米级大型撞击的新鲜喷出岩毯的挖掘,对喷出岩厚度进行点测。我们估算了 73 个月球环形山(直径 0.1-4.8 千米)边缘的喷出厚度,并为三个环形山绘制了喷出厚度等距图。我们推导出了一个喷出厚度方程,其中,r 是距离环形山中心的水平距离,R 是环形山中心到边缘的半径,B 描述了喷出厚度随径向距离衰减的速率。我们得出的 B 平均值(2.8 ± 0.1)与之前的研究结果相似,但我们观察到,在喷出岩毯内部,B 的变化可能很大。
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Ejecta Blankets at Small Craters on the Moon
Impact-derived ejecta covers most of the lunar surface, originating from recent impacts through to the beginning of the geologic record. Despite how common ejecta is, accurate measurements of ejecta thickness are difficult to obtain, and existing estimates of ejecta thickness vary widely. This study uses excavation by meter-scale impacts on the fresh ejecta blankets of larger, kilometer-scale impacts to make point measurements of ejecta thickness. We estimate ejecta thickness at the rims of 73 lunar craters (0.1–4.8 km diameter) and create isopach maps of ejecta thickness for three craters. We derive an equation for ejecta thickness, , where r is the horizontal distance from the center of the crater, R is the center-to-rim crater radius, and B describes the rate at which ejecta thickness decays with radial distance. Our average value for B (2.8 ± 0.1) is similar to previous work, though we observe that B can vary significantly within an ejecta blanket.
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来源期刊
The Planetary Science Journal
The Planetary Science Journal Earth and Planetary Sciences-Geophysics
CiteScore
5.20
自引率
0.00%
发文量
249
审稿时长
15 weeks
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