Dating very young planetary surfaces from crater statistics: A review of issues and challenges
Dating very young planetary surfaces from crater statistics: A review of issues and challenges
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DOI：
10.1111/maps.12924
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发表时间：
2018-04
影响因子：
2.2
通讯作者：
Jean‐Pierre Williams;C. H. Bogert;A. Pathare;G. Michael;M. Kirchoff;H. Hiesinger
中科院分区：
文献类型：
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作者：
Jean‐Pierre Williams;C. H. Bogert;A. Pathare;G. Michael;M. Kirchoff;H. Hiesinger
确定年轻行星表面的年龄依赖于使用直径通常为亚公里级的小型撞击坑群，因为它们形成的频率较高。然而，较小的陨石坑对于估计年龄来说可能不太可靠，因为它们的大小频率分布更容易因是否应该使用它们的争论而改变。目前，在月球和火星表面获取了大量米级分辨率的图像，小型陨石坑已被广泛用于推导模型年龄，以建立近期地质事件的时间关系。在这篇综述论文中，我们讨论了导致较小陨石坑使用起来特别困难的许多因素，当陨石坑数量仅限于小陨石坑直径时应考虑这些因素。建立对模型年龄的信心最终需要了解所测年表面的地质背景，因为可靠性可能有很大差异，并且在将年龄应用于任何地质解释时应考虑测年技术的局限性。
Determining the ages of young planetary surfaces relies on using populations of small, often sub‐km diameter impact craters due to the higher frequency at which they form. Smaller craters however can be less reliable for estimating ages as their size‐frequency distribution is more susceptible to alteration with debate as to whether they should be used at all. With the current plethora of meter‐scale resolution images acquired of the lunar and Martian surfaces, small craters have been widely used to derive model ages to establish the temporal relation of recent geologic events. In this review paper, we discuss the many factors that make smaller craters particularly challenging to use and should be taken into consideration when crater counts are confined to small crater diameters. Establishing confidence in a model age ultimately requires an understanding of the geologic context of the surface being dated as reliability can vary considerably and limitations of the dating technique should be considered in applying ages to any geologic interpretation.