Chang’E-4(CE-4)successfully landed on the floor of the Von Kármán crater within the South Pole-Aitken basin(SPA).One of its scientific objectives is to determine the subsurface structure and the thickness o...Chang’E-4(CE-4)successfully landed on the floor of the Von Kármán crater within the South Pole-Aitken basin(SPA).One of its scientific objectives is to determine the subsurface structure and the thickness of lunar regolith at the landing site and along the traverse route of the Yutu-2 rover.Using orbital data,we employed small craters(diameters<1 km)on the floor of the Von Kármán crater as probes to investigate the subsurface structure and stratigraphy of the CE-4 landing site.In this study,40 dark-haloed craters that penetrate through the surface Finsen ejecta and excavate underlying mare deposits were identified,and 77 bright ray craters that expose only the underlying fresh materials but do not penetrate through the surface Finsen ejecta were found.The excavation depths of these craters and their distances from the Finsen crater center were calculated,and the thickness distribution of Finsen ejecta on the Von Kármán floor was systematically investigated.The boundary between Finsen ejecta and underlying mare basalt at the CE-4 landing site is constrained to a depth of 18 m.We have proposed the stratigraphy for the CE-4 site and interpreted the origins of different layers and the geological history of the Von Kármán crater.These results provide valuable geological background for interpreting data from the Lunar Penetrating Radar(LPR)and Visible and Near-infrared Imaging Spectrometer(VNIS)on the Yutu-2 rover.The CE-4 landing site could provide a reference point for crater ejecta distribution and mixing with local materials,to test and improve ejecta thickness models according to the in situ measurements of the CE-4 LPR.展开更多
月球作为地球的唯一天然卫星,围绕地球奔腾旋转不息,自古以来人们对其充满好奇并无限向往,激发了人类的探月梦想。自1969年以来,6次Apollo载人和3次Luna无人探测任务成功实现了人类登陆月球和采样返回,加深了人类对月球的科学认识,把月...月球作为地球的唯一天然卫星,围绕地球奔腾旋转不息,自古以来人们对其充满好奇并无限向往,激发了人类的探月梦想。自1969年以来,6次Apollo载人和3次Luna无人探测任务成功实现了人类登陆月球和采样返回,加深了人类对月球的科学认识,把月球地质学的研究推向了新的阶段(Heiken et al.,1991;Jolliff et al.,2006)。来自轨道遥感、原位探测和采样返回任务的结果揭示全球性的岩浆洋、撞击成坑、火山作用和太空风化等地质作用塑造了现在的月表形貌、结构和物质成分分布特征。展开更多
基金supported by National Science and Technology Infrastructure Work Programs(2015FY210500)the Key Research Program of Frontier Sciences+3 种基金Chinese Academy of Sciences(QYZDY-SSW-DQC028)the Strategic Priority Program of the Chinese Academy of Sciences(XDB41000000)the National Natural Science Foundation of China(41773065,41941003,and 41902317)the Natural Science Foundation of Inner Mongolia,China(2020LH04002)。
基金supported by the National Natural Science Foundation of China (Grant Nos. 41490633 and 41590851)the open fund of the State Key Laboratory of Lunar and Planetary Sciences (Macao University of Science and Technology) (Macao FDCT Grant No. 119/2017/A3)+6 种基金the open fund of the Key Laboratory of Lunar and Deep Space Exploration, Chinese Academy of Sciencessupported by the National Natural Science Foundation of China (U1931211, 41972322 and 11941001)the Natural Science Foundation of Shandong Province (ZR2019MD008)Qilu (Tang) Young Scholars Program of Shandong University, Weihai (2015WHWLJH14)supported by the Program for JLU Science and Technology Innovative Research Team (JLUSTIRT, 2017TD-26)the Focus on Research and Development Plan in Shandong Province (2018GGX101028)the Shandong Provincial Natural Science Foundation (ZR2019MD015)
文摘Chang’E-4(CE-4)successfully landed on the floor of the Von Kármán crater within the South Pole-Aitken basin(SPA).One of its scientific objectives is to determine the subsurface structure and the thickness of lunar regolith at the landing site and along the traverse route of the Yutu-2 rover.Using orbital data,we employed small craters(diameters<1 km)on the floor of the Von Kármán crater as probes to investigate the subsurface structure and stratigraphy of the CE-4 landing site.In this study,40 dark-haloed craters that penetrate through the surface Finsen ejecta and excavate underlying mare deposits were identified,and 77 bright ray craters that expose only the underlying fresh materials but do not penetrate through the surface Finsen ejecta were found.The excavation depths of these craters and their distances from the Finsen crater center were calculated,and the thickness distribution of Finsen ejecta on the Von Kármán floor was systematically investigated.The boundary between Finsen ejecta and underlying mare basalt at the CE-4 landing site is constrained to a depth of 18 m.We have proposed the stratigraphy for the CE-4 site and interpreted the origins of different layers and the geological history of the Von Kármán crater.These results provide valuable geological background for interpreting data from the Lunar Penetrating Radar(LPR)and Visible and Near-infrared Imaging Spectrometer(VNIS)on the Yutu-2 rover.The CE-4 landing site could provide a reference point for crater ejecta distribution and mixing with local materials,to test and improve ejecta thickness models according to the in situ measurements of the CE-4 LPR.
文摘月球作为地球的唯一天然卫星,围绕地球奔腾旋转不息,自古以来人们对其充满好奇并无限向往,激发了人类的探月梦想。自1969年以来,6次Apollo载人和3次Luna无人探测任务成功实现了人类登陆月球和采样返回,加深了人类对月球的科学认识,把月球地质学的研究推向了新的阶段(Heiken et al.,1991;Jolliff et al.,2006)。来自轨道遥感、原位探测和采样返回任务的结果揭示全球性的岩浆洋、撞击成坑、火山作用和太空风化等地质作用塑造了现在的月表形貌、结构和物质成分分布特征。
