Rootless cones on Mars indicating the presence of shallow equatorial ground ice in recent times
Rootless cones on Mars indicating the presence of shallow equatorial ground ice in recent times
复制标题
火星上的无根锥表明近代存在浅赤道地面冰
DOI：
10.1029/2001gl012932
复制
发表时间：
2001
影响因子：
5.2
通讯作者：
T. Thordarson
中科院分区：
文献类型：
--
作者：
P. Lanagan;A. McEwen;L. Keszthelyi;T. Thordarson
高分辨率的火星轨道器相机（MOC）图像揭示了在地狱犬平原，Marte Valles和亚马逊平原，火星上存在着小锥体集群。这些锥在形态和平面尺寸上都与冰岛无根锥相似，后者是由于表层熔岩和近地表地下水之间的爆炸性相互作用而形成的。撞击坑的大小-频率关系表明，圆锥体所在的表面不超过10 Ma。如果火星上的圆锥体与地球上的无根圆锥体的形成方式相同，那么在地质学上，在最近的时期，赤道地区的地面冰或地下水一定存在于地表附近。
High resolution Mars Orbiter Camera (MOC) images have revealed the existence of clusters of small cones in the Cerberus plains, Marte Valles, and Amazonis Planitia, Mars. These cones are similar in both morphology and planar dimensions to the larger of Icelandic rootless cones, which form due to explosive interactions between surficial lavas and near‐surface groundwater. Impact crater size‐frequency relationships indicate that surfaces upon which the cones sit are no older than 10 Ma. If martian cones form in the same manner as terrestrial rootless cones, then equatorial ground ice or ground water must have been present near the surface in geologically recent times.