• ISSN 2097-1893
    • CN 10-1855/P

    月球撞击坑形貌演化与年代测定方法研究综述

    Lunar impact crater morphological evolution and chronology: A review

    • 摘要: 月球表面因缺乏大气、水体及活跃构造活动,完整保存了太阳系早期的撞击地质记录,成为研究行星形成与演化历史的关键天然实验场. 广泛分布于月表的撞击坑,其几何形态参数(坑深、直径、坑缘高度及坡度特征)系统记录了形成与演化机制,不仅揭示了撞击动力学过程及靶体介质响应特征,还为分析月表地貌演化阶段、区域地质事件、地质年代序列及表层物质性质演变提供了关键形态学依据. 月表撞击坑受空间风化、微陨石撞击及热循环等作用影响发生持续退化. 地形扩散模型作为量化简单撞击坑地形退化速率的理论框架,通过模拟坑缘迁移与地形重分布,有效解耦原始撞击特征与后期改造效应. 在此基础上,撞击坑形态参数与退化程度的定量关系,正成为连接形貌观测、过程解释与年代反演的关键纽带. 本文综述了高分辨率几何参数提取技术、退化判据构建方法及其在年代学反演中的应用逻辑. 针对撞击坑计数频度定年法,重点梳理了小尺度撞击坑自动化识别、退化效应修正算法及统计不确定性控制策略的创新,并评述了该方法在月海、高地等不同地质单元中的精度边界与适用条件. 本文探讨不同空间尺度撞击坑在保存状态、识别难度及统计稳健性方面的差异,并分析现有研究在数据分辨率、样本完整性与模型假设等方面的主要限制. 近十年,美国月球勘测轨道器及其搭载的月球轨道器激光高度计、中国嫦娥探月工程及日本月球学与工程探测器SELENE等提供的高精度数字高程模型和遥感影像产品,可实现对20 m直径级撞击坑的精确识别与参数提取,并显著提升了年代学研究的空间分辨率与统计显著性. 本文旨在阐明撞击坑形成、演化与退化的耦合机制,评估撞击坑尺寸-频率分布定年法的优化路径,阐明探月计划数据对模型验证的支撑作用,并建立综合性研究框架. 该框架将深化月球表层演化规律认知,优化撞击坑退化模型,推动多源遥感数据协同应用,为未来月面精细年代划分、表层物质退化过程研究及数值模拟提供理论依据与实践指导.

       

      Abstract: Due to the absence of an atmosphere, water, and active tectonic activity, the lunar surface has preserved an intact record of early impact geology in the Solar System, making it a crucial natural laboratory for studying the history of planetary formation and evolution. The widely distributed craters on the lunar surface systematically record their formation and evolution mechanisms through geometric morphological parameters (depth, diameter, rim height, and slope characteristics), revealing impact dynamics and target medium response features, while providing critical morphological evidence for analyzing lunar surface landform evolution stages, regional geological events, chronological sequences, and surface material property evolution. Lunar impact craters undergo continuous degradation due to space weathering, micrometeorite impacts, and thermal cycling. Topographic diffusion models serve as a theoretical framework for quantifying the degradation rates of simple impact craters; by simulating rim migration and topographic redistribution, they effectively decouple original impact features from subsequent modification effects. On this basis, the quantitative relationship between crater morphological parameters and degradation degree has gradually become an important bridge linking morphological observation, process interpretation, and chronological inversion. This paper reviews high-resolution geometric parameter extraction techniques, methods for constructing degradation criteria, and their application logic in chronological inversion. Regarding the crater size-frequency distribution (CSFD) dating method, this paper focuses on innovations in the automated identification of small-scale craters, algorithms for correcting erosion effects, and strategies for controlling statistical uncertainties. It also evaluates the accuracy limits and applicability of this method in different geological units, such as lunar maria and highlands. Meanwhile, this paper also pays attention to differences among impact craters of different spatial scales in terms of preservation state, identification difficulty, and statistical robustness, and analyzes the main limitations of existing studies in data resolution, sample completeness, and model assumptions. In the past decade, high-precision digital elevation models and remote sensing imagery products from the Lunar Reconnaissance Orbiter (LRO) and its Lunar Orbiter Laser Altimeter (LOLA) in the United States, China's Chang'e lunar exploration program, and Japan's SELENE lunar science and engineering mission have enabled precise identification and parameter extraction of impact craters with diameters of 20 meters or larger, significantly enhancing the spatial resolution and statistical significance of chronology research. This paper aims to elucidate the coupled mechanisms of crater formation, evolution, and degradation; evaluate optimization pathways for the CSFD dating method; and clarify the role of data from various exploration missions across different developmental stages in model validation. It further provides a comprehensive research perspective for understanding the evolutionary patterns of the lunar surface, improving crater degradation models, and promoting the coordinated application of multi-source remote sensing data and provides a theoretical basis and practical guidance for future refined chronological classification of the lunar surface, studies on surface material degradation processes, and the advancement of related numerical simulations.

       

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