The InSight mission landed its scientific payload in Homestead hollow, a quasi‐circular depression interpreted to be a highly degraded impact crater that is 27 m in diameter. The original pristine crater formed in a preexisting impact‐generated regolith averaging ~3 m thick and the surrounding ejecta deposit, consisting of coarse and mostly fine fragments, was in disequilibrium with local geomorphic thresholds. As a result, early, relatively rapid degradation by mostly eolian, and lesser impact processes and mass‐wasting, stripped the rim and mostly infilled the hollow where sediments were sequestered. Early, faster degradation during the first ~0.1 Ga was followed by much slower degradation over the bulk of the 0.4–0.7 Ga history of the crater. Pulses of much lesser degradation are attributed to impacts in and nearby the hollow, which emplaced some rocks as ejecta and provided small inventories of fine sediments for limited additional infilling. Even lesser sediments were derived from the very slow production of fines via weathering of resistant basaltic rocks. Nevertheless, indurated regolith caps the sediment fill within the hollow and creates a relatively stable present‐day surface that further sequesters infilling sediments from remobilization. The degradation sequence at Homestead hollow is like that established at the Spirit rover landing site in Gusev crater and points to the importance of eolian, and lesser impact and mass‐wasting processes, in degrading volcanic surfaces on Mars over the past ~1 Ga.

中文翻译：

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基于局部沉积物分布和性质的InSight着陆点宅基地空地退化

该InSight的任务落在它的科学有效载荷在宅基空心，准圆形凹陷被认为是直径27 m的高度退化的撞击坑。原始的原始陨石坑形成于一个预先存在的，由撞击产生的碎屑岩中，平均厚度约3 m，周围的喷射沉积物（由粗糙且大部分为细碎的碎片组成）处于局部地貌阈值的不平衡状态。结果，早期（相对较快）的降解（主要是风尘），较少的冲击过程和大量浪费使边缘剥落，并且大部分填充了隔离沉淀物的中空区域。在最初的〜0.1 Ga期间，早期较快的降解，随后在整个0.4-0.7 Ga的火山口历史中，降解较慢。退化程度要小得多的脉冲归因于中空及其附近的撞击，它把一些岩石安置成喷射点，并提供少量细小沉积物清单，以限制额外的填充。通过抵抗性玄武岩的风化，细粉的产生非常缓慢，从而产生的沉积物更少。但是，硬石膏会堵塞凹陷区域内的沉积物并形成相对稳定的现今表面，从而进一步隔离从动员中填充的沉积物。降解顺序为家园空心就像是在既定的精神在古谢夫陨石坑和点流动站登陆网站风尘的重要性，和影响较小的和大规模浪费过程，在过去的1〜嘎火星上火山降解的表面。