Fine debris flows formed by the Orientale basin  

作　　者：YuZhen Cai ZhiYong Xiao ChunYu Ding Jun Cui 

机构地区：[1]Planetary Environmental and Astrobiological Laboratory,School of Atmospheric Sciences,Sun Yat-sen University,Zhuhai,Guangdong 519000,China [2]State Key Laboratory of Lunar and Planetary Sciences,Space Science Institute,Macao University of Science and Technology,Macao 999078,China [3]Center for Excellence in Comparative Planetology,Chinese Academy of Science,Hefei 230026,China [4]Key Laboratory of Lunar and Deep Space Exploration,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China

出　　处：《Earth and Planetary Physics》2020年第3期212-222,共11页地球与行星物理（英文版）

基　　金：the B-type Strategic Priority Program of the Chinese Academy of Sciences,Grant No.XDB41000000;the National Natural Science Foundation of China(41773063,41525015 and 41830214);the Science and Technology Development Fund of Macao(0042/2018/A2);the Pre-research Project on Civil Aerospace Technologies(No.D020101)of CNSA.

摘　　要：The prototype for investigations of formation mechanisms and related geological effects of large impact basins on planetary bodies has been the Orientale basin on the Moon.Its widespread secondaries,light plains,and near-rim melt flows have been well mapped in previous studies.Flow features are also widely associated with secondaries on planetary bodies,but their physical properties are not well constrained.The nature of flow features associated with large impact basins are critically important to understand the emplacement process of basin ejecta,which is one of the most fundamental processes in shaping the shallow crusts of planetary bodies.Here we use multisource remote sensing data to constrain the physical properties of flow features formed by the secondaries of the Orientale basin.The results suggest that such flows are dominated by centimeter-scale fine debris fines;larger boulders are not abundant.The shattering of target materials during the excavation of the Orientale basin,landing impact of ejecta that formed the secondaries,and grain comminution within the flows have substantially reduced particle sizes,forming the fine flows.The discovery of global-wide fine debris flows formed by large impact basins has profound implications to the interpretation of both previously-returned samples and remote sensing data.

关 键 词：MOON Orientale impact craters impact cratering EJECTA 

分 类 号：P642.23[天文地球—工程地质学]