Candidate areas for in situ ancient lunar materials
Candidate areas for in situ ancient lunar materials
复制标题
原位古月球物质候选区
DOI：
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发表时间：
1976
期刊：
影响因子：
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通讯作者：
R. H. Morrison
中科院分区：
文献类型：
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作者：
V. Oberbeck;R. H. Morrison
报道了石英砂靶的高速撞击实验结果。对陨石坑喷出物羽状物的解剖显示，它们是相对较薄的锥形薄片。进一步的解剖显示了单个粒子轨迹与喷出羽流之间的关系。在实验的基础上建立了一个陨石坑模型，用于解释先前在实验室陨石坑和陨石陨石坑中描述的倒置地层。该模型解释了第谷陨石坑连续沉积的外围部分和某些第谷次级陨石坑群的下游部分的次生陨石坑的覆盖。模型结果表明，当盆地喷出物就位时，次生陨石坑会产生广泛的混合。这项研究揭示了月球高地上的某些地区相对来说没有被盆地次生陨石坑形成，也没有被次生陨石坑碎片涌流覆盖，这些地区可能代表了原位的古代月球物质。
Results of high-speed impact cratering in quartz sand targets are reported. Dissection of the ejecta plumes of the craters revealed that they are relatively thin conical sheets. Further dissection showed the relationship between individual particle trajectories and the ejecta plume. A model of cratering, based on the experiments, was used to explain the inverted stratigraphy previously described in laboratory impact craters and in meteorite craters. Mantling of secondary craters in peripheral parts of the continuous deposits of Tycho Crater and in the downrange parts of certain Tycho secondary crater clusters is accounted for by the model. Model results indicate extensive mixing by secondary cratering when basin ejecta is emplaced. The study reveals certain areas on the lunar uplands that have been relatively uncratered by basin secondaries and unmantled by secondary crater debris surges and that may represent in situ ancient lunar materials.