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首页> 外文期刊>Geophysical Research Letters >Recent high-latitude icy mantle in the northern plains of Mars: Characteristics and ages of emplacement
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Recent high-latitude icy mantle in the northern plains of Mars: Characteristics and ages of emplacement

机译：火星北部平原最近的高纬度冰冷地幔：侵袭的特征和年代

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摘要

Martian high-latitude zones are covered with a smooth, layered ice-rich mantle containing characteristic polygonal patterns. The mantle is especially uniform and homogeneous in the northern plains. We performed a survey of decameter-scale mantle textures and circular features, including impact craters, in the northern lowlands down to 50 degrees N latitude. Strongly altered and mantled craters of impact and non-impact origin form a population of subtle circular features below the mantle. Pits of non-impact origin are numerous in some regions at lower latitudes. Impact craters superposed on the mantle are small and very sparse. The inferred mean crater retention age of the mantle is similar to 0.1 Ma. The spatial distribution of young craters suggests an age difference between the highest latitudes ( younger) and some lower-latitude regions ( older). Latitudinal trends in polygon textures agree with impact crater evidence for a latitudinal age progression of mantle properties.
机译：火星高纬度地区覆盖着光滑的，分层的富含冰的地幔，其中包含特征性的多边形图案。北部平原的地幔特别均匀。我们对北纬50度以下低地北部的数十米尺度的地幔结构和圆形特征（包括撞击坑）进行了调查。撞击和非撞击起源的剧烈变化和覆盖的陨石坑在覆盖层以下形成了微妙的圆形特征。在较低纬度的某些地区，无撞击起源的坑很多。叠加在地幔上的撞击坑很小且非常稀疏。推定的地幔的平均火山口滞留年龄类似于0.1 Ma。年轻的陨石坑的空间分布表明，最高纬度（较年轻）和一些较低纬度区域（较旧）之间存在年龄差异。多边形纹理的纬度趋势与地幔特性的纬度年龄演变的撞击坑证据一致。

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