Messier撞击坑辐射纹形成及斜撞击研究

发布时间：2018-04-18 08:32

本文选题：Messier复合撞击坑 + 溅射堆积　；参考：《地球物理学进展》2015年02期

【摘要】：具有辐射纹的撞击坑是一种特殊的撞击构造,只形成于某些区域一定规模的撞击事件.由于大部分撞击事件都是斜撞击,本文以Messier复合撞击坑为例研究并模拟了斜撞击抛射和辐射纹形成物理过程.Messier复合撞击坑包含Messier撞击坑和Messier A撞击坑,是月球上典型的小角度斜撞击形成的撞击坑.对Messier复合撞击坑的对称性分析发现,Messier A撞击坑对称轴相对于Messier撞击坑对称轴存在一个逆时针小角度偏转,这个小角度偏转说明Messier复合撞击坑起源于一次非理想斜撞击.基于对辐射纹形成过程的认识,本文建立了斜撞击抛射模型,合理解释了Messier复合撞击坑的南北方向辐射纹以及朝西方向辐射纹成因;并利用蒙特卡洛方法数值模拟了斜撞击产生的辐射纹分布,为Messier复合撞击坑的形成提供了一种新的合理解释.
[Abstract]:The impact crater with radiation stripes is a special impact structure, which is formed only in some areas of a certain scale of impact events.Because most of the impact events are oblique, this paper studies and simulates the physical process of oblique impact ejection and radiation ripple formation. Messier composite impact crater contains Messier impact crater and Messier A impact crater, taking Messier composite impact crater as an example.A crater formed by a typical small angle oblique impact on the moon.The symmetry analysis of the Messier composite impact crater shows that the symmetry axis of the Messier A impact crater has a small counterclockwise deflection relative to the Messier impact crater symmetry axis. This small angle deflection indicates that the Messier composite impact crater originated from a non-ideal oblique impact.Based on the understanding of the formation process of the radiation stripes, an oblique impact ejection model is established, which reasonably explains the causes of the north-south and westward radiation lines of the Messier composite impact crater.The radiation distribution caused by oblique impact is numerically simulated by Monte Carlo method, which provides a new reasonable explanation for the formation of Messier composite impact crater.
【作者单位】：井冈山大学数理学院;同济大学物理科学与工程学院;中国航空物探遥感中心地球观察技术实验室;
【基金】：月表物质成分类型的识别与定量反演技术研究(20010AA122203) 月球重点地区地质结构研究及探月新技术开发(1212010811050) 月球撞击地质构造形成物理机制研究(20132BAB212011) 江西省原子与分子物理重点学科(2011-2015)联合资助
【分类号】：P184

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