顾及月表铁元素含量的次生撞击坑识别

徐箫剑; 叶乐佳; 康志忠; 蒋文宸; 栾栋; 张冬亚

doi:10.13203/j.whugis20200345

顾及月表铁元素含量的次生撞击坑识别

徐箫剑^1,2,
叶乐佳³,
康志忠^1,2, ,,
蒋文宸⁴,
栾栋^1,2,
张冬亚^1,2

1. 中国地质大学(北京)土地科学技术学院, 北京 100083;
2. 教育部深空探测联合研究中心月球与行星探测国际合作研究分中心, 北京 100083;
3. 中国科学院空天信息创新研究院, 北京 100094;
4. 沐城测绘(北京)有限公司, 北京 100102

基金项目:

国家自然科学基金项目（41872207）、国家重点研发计划项目（2019YFE0123300）、国防科工局民用航天技术预先研究项目（D020204）

详细信息

作者简介:
徐箫剑,硕士生,主要从事月球与行星遥感方向研究。2012190007@cugb.edu.cn

通讯作者:
康志忠,博士,教授,主要从事数字摄影测量、激光雷达数据处理以及月球与行星遥感等方向研究。zzkang@cugb.edu.cn

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出版历程
- 收稿日期: 2020-07-09
- 网络出版日期: 2023-09-26

The Identification of Secondary Craters based on the Distribution of Iron Element on Lunar Surface

1. School of Land Science and Technology, China University of Geosciences, Beijing 100083;
2. Subcenter of International Cooperation and Research on Lunar and Planetary Exploration, Center of Space Exploration, Ministry of Education of The People's Republic of China, Beijing 100083;
3. Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094;
4. Beijing Mucheng House Surveying and Mapping Technology Service Co. Ltd., Beijing 100102

Funds:

The National Natural Science Foundation of China (41872207)

摘要

摘要: 月表地质年代的确定是研究月球形成及演化历史，反演月质事件发生过程的基础。在对月表地质单元定年时，由于月球岩石、土壤和岩心样品数量有限，能够利用这些样品做同位素定年的地质单元范围很小，因此更大范围的月球表面的绝对年龄需要采用撞击坑尺寸频率定年法（crater size-frequency distribution，CSFD）测定。然而月球表面次生撞击坑的存在会导致CSFD法得到的定年结果会出现偏差，故在标注撞击坑时有必要对次生撞击坑予以剔除，以便对行星表面的地质单元做较为准确的定年。本文提出一种顾及月表铁元素含量的次生撞击坑识别方法。使用波段比值法获取月表铁元素含量信息，以次生撞击坑内铁元素含量更接近月壤铁元素含量为假设前提，以撞击坑内与月壤铁元素含量的差值为判据分离主撞击坑和次生撞击坑。文中以日本月亮女神MI多光谱数据为实验数据，验证本文方法的有效性和稳健性。实验结果表明，在依据铁元素含量剔除次生撞击坑后的定年结果与已知定年结果之差小于0.04Ga，具有较好的一致性；与其它次生撞击坑剔除方法相比，依据月表铁元素信息剔除次生撞击坑的结果更可靠。
- 次生撞击坑 /
- 撞击坑尺寸频率定年法 /
- 多光谱影像 /
- 铁元素
Abstract: To determine the geologic age of the lunar surface is the foundation of the research on the formation and evolution of the Moon, and of the inversion of the processes of lunar geological events. Lack of lunar rock and soil samples limits the range of geological units that can used for isotopic dating. Therefore, the dating using crater size-frequency distribution (CSFD) is employed to obtain the geologic ages of broader regions on the lunar surface. However, the presence of secondary craters will lead to a deviation in geologic age which is obtained by CSFD method. Thus, to get a more accurate geologic age, secondary craters should be eliminated. This paper presents a method to identify secondary craters based on the distribution of iron element on lunar surface. First, the method assumes that the iron content in secondary craters is close to that in lunar regolith. Then, band ratio method is utilized to acquire the iron content. Finally, secondary craters are distinguished from primary ones in terms of the difference of iron content between craters and lunar regolith. The effectiveness and robustness of the proposed method were tested using MI multispectral data of the Japanese Selene Mission. The experimental results show that the geologic age deviation compared with the known isotopic dated ones is less than 0.04Ga, which shows good consistency. Compared with other secondary craters identification methods, the proposed approach is proven to be more effective and robust.
- secondary craters /
- crater size-frequency distribution /
- multispectral images /
- iron element

HTML全文

图 1 不同元素和矿物在小撞击坑内的分布

Figure 1. Distribution of Elements and Minerals in Small Craters

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图 2 撞击坑铁元素含量计算示意图

Figure 2. Calculation Diagram of Iron Content in Crater

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图 3 识别次生撞击坑的阈值计算流程

Figure 3. Determination Flowchart of Recognition Threshold of Secondary Craters

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图 4 等时线图

Figure 4. Diagram of Isochron

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图 5 测试区与实验区分布

Figure 5. Distribution of Test Areas and Experimental Areas

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图 6 实验区铁元素含量

Figure 6. Iron Content in Experimental Areas

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图 7 实验区定年结果

Figure 7. Dating Results of Experimental Areas

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图 8 虹湾Area 1测试结果

Figure 8. Test Results and Details of Sinus Iridum Area 1

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表 1 实验区铁元素含量参数

Table 1 Iron Content Paremeters in Experimental Areas

实验区域	最大值	最小值	$\|\bar{Δ}\|$	$σ$
实验区1	0.235 5	0.001 8	0.035 3	0.033 4
实验区2	0.113 2	0.015 6	0.048 2	0.017 7

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表 2 实验区和测试区定年结果/Ga

Table 2 Dating Results of Experimental and Test Areas/Ga

区域	文献定年结果	未剔除次生撞击坑定年结果	本文定年结果
实验区1	3.29^[21]	3.47 (+0.03，-0.04)	3.32 (+0.07，-0.12)
实验区2	3.17^[21]	3.43 (+0.03，-0.03)	3.17 (+0.08，-0.13)
虹湾Area 1	3.01^[20]	3.27 (+0.04，-0.06)	3.02 (+0.10，-0.14)
虹湾Area 2	2.96^[20]	3.31 (+0.06，-0.08)	3.04 (+0.15，-0.25)
注：括号内数字表示CSFD地质定年误差

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表 3 不同次生撞击坑探测法的定年结果对比/Ga

Table 3 Dating Results Comparison of Different Secondary Crater Detection Methods/Ga

区域	文献定年结果	层聚类次生撞击坑探测法^[13]	未分段次生撞击坑探测法^[16]	本文方法
齐奥尔科夫斯基撞击坑	3.2^[21]	3.44(+0.02，-0.03)	3.37(+0.068，-0.068)	3.22(+0.06，-0.08)
虹湾Area 1	3.01^[20]	3.19(+0.06，-0.08)	3.22(+0.06，-0.08)	3.02(+0.10，-0.14)
虹湾Area 2	2.96^[20]	3.31(+0.06，-0.08)	2.44(+0.32，-0.33)	3.04(+0.15，-0.25)
注：括号内数字表示CSFD地质定年误差

下载: 导出CSV

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顾及月表铁元素含量的次生撞击坑识别

作者简介: 徐箫剑,硕士生,主要从事月球与行星遥感方向研究。2012190007@cugb.edu.cn

通讯作者: 康志忠,博士,教授,主要从事数字摄影测量、激光雷达数据处理以及月球与行星遥感等方向研究。zzkang@cugb.edu.cn

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出版历程

The Identification of Secondary Craters based on the Distribution of Iron Element on Lunar Surface

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出版历程

目录

作者简介:
徐箫剑,硕士生,主要从事月球与行星遥感方向研究。2012190007@cugb.edu.cn

通讯作者:
康志忠,博士,教授,主要从事数字摄影测量、激光雷达数据处理以及月球与行星遥感等方向研究。zzkang@cugb.edu.cn