月陆地区次级撞击坑特征及年龄统计方法

发布时间：2018-10-20 13:56

【摘要】：通过撞击坑的大小频率计算月表的地质年龄是一种行之有效的方法,包括累积分布法和相对分布法。其中累计分布法在已知撞击坑直径范围的基础上,可分为3种年代函数计算月表的地层单元,分别是Melosh和Vickery 1989(直径大于4km撞击坑),Neukum 1983(直径大于1km撞击坑)和李坤等2012(直径小于1km撞击坑)。应用高分辨率影像SELENE TC(10m/pixel)数据,完成了Apollo 14及Apollo 16登月区域地层单元的解译,并应用撞击坑直径-频率统计方法获取同一地层单元的形成年龄。通过与Apollo登月区域样品同位素年龄对照,得出Neukum 1983(直径大于1km撞击坑)相对于其他几种方法更加准确,同时分析了撞击坑的退化、次级撞击坑影响等相关问题。
[Abstract]:It is an effective method to calculate the geological age of the monthly surface by the size and frequency of the impact crater, including the cumulative distribution method and the relative distribution method. On the basis of known impact crater diameter range, the cumulative distribution method can be divided into three types of chronological functions to calculate the stratigraphic units of the monthly table. They are Melosh and Vickery 1989 (diameter larger than 4km crater), Neukum 1983 (diameter larger than 1km crater) and Li Kun 2012 (diameter smaller than 1km impact crater). The interpretation of stratigraphic units in Apollo 14 and Apollo 16 lunar landing regions was completed by using high resolution image SELENE TC (10m/pixel data, and the age of formation of the same stratigraphic unit was obtained by using the impact crater diameter-frequency statistics method. By comparing with the isotopic ages of samples in the Apollo lunar landing area, it is concluded that Neukum 1983 (diameter larger than 1km impact crater) is more accurate than other methods, and the degradation of impact crater and the influence of secondary impact crater are also analyzed.
【作者单位】：吉林大学地球探测科学与技术学院;中国科学院月球与深空探测重点实验室;
【基金】：国家自然科学基金项目(41372337,41373068) 中国科学院月球与深空探测重点实验室开放基金资助项目
【分类号】：P184

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