月海低撞击坑频率和低模型年龄：近期内生活动还是退化效应？
Low crater frequencies and low model ages in lunar maria: Recent endogenic activity or degradation effects?
摘要：
最近，一些研究已经确定，使用标准遥感技术的小型月球地质结构的年龄小于100 Ma。在这里，我们提出了新的陨石坑大小频率分布（CSFD）和模型年龄使用陨石坑D> 10米的5个小目标单元：1不规则的海补丁（IMP）在海Nubium和4个地区位于月球皱纹脊在海Humorum。为了进行比较，我们还确定了在最近的一项静海研究中发现的另一种IMP的日期（Braden等人，2014年）。绝对模型年龄推导对应于46 $\pm$ 5 Ma和22 $\pm$ 1 Ma的Nubium和Sosigenes IMP。我们发现，IMP和附近的控制母马地区类似的生产累积对数SFD斜率为-3。相比之下，Hare Humorum的控制母马区域表现出较浅的平衡斜率，从-1.83到-2。四分之三的褶皱脊似乎处于平衡状态，但陨石坑的寿命低于相应的月海。一个褶皱脊上的低火山口频率导致8.6 $\pm$ 1 Ma的年龄。该研究区域包含80%的新陨石坑，这表明陨石坑人口仍在生产，表明最近的表面重塑事件。
英文摘要：
Recently a number of studies have identified small lunar geologic structures to be <100 Ma in age using standard remote sensing techniques. Here we present new crater size frequency distributions (CSFD) and model ages using craters D> 10 m for 5 small target units: 1 Irregular Mare Patch (IMP) in Mare Nubium and 4 regions located on lunar wrinkle ridges in Mare Humorum. For comparison we also date another IMP found in a recent study in Mare Tranquillitatis (Braden et al., 2014). Absolute model age derivation corresponds to 46$\pm$5 Ma and 22$\pm$1 Ma for Nubium and Sosigenes IMP. We show that for IMPs and in nearby control mare regions similar production-like cumulative log-log SFD slopes of -3 are observed. In contrast control mare regions in Mare Humorum exhibit shallower equilibrium slopes from -1.83 to -2. 3 out of 4 wrinkle ridges appear to be in equilibrium but with crater life times lower than on the corresponding maria. Low crater frequencies on one wrinkle ridge result in an age of 8.6$\pm$1 Ma. This study region contains 80% fresh craters which suggests that the crater population is still in production indicative of a recent resurfacing event.
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