Abstract

The article is devoted to a detailed photogeological and topographic analysis of the surface in the region of Oxia Planum, which is the most likely landing site for the rover of the ExoMars mission. The landing site consists of two topographic domains (highlands and lowlands) separated by a sharp regional slope. The highland domain accounts for approximately 25% of the landing site. The main unit of this domain is lava plains with an absolute model age of 3.65 Ga. These plains extend to the west and cover almost the entire surface of the lowlands, where they are overlain by a relatively thin (first tens of meters) layer of material removed from the highlands during the period of fluvial activity. The age of its final phase is estimated at 3.53 Ga. The material to be tested by the ExoMars rover is mainly associated with the final accumulation phase and is represented by deposits of dark and light smooth plains within the lowlands. The material of the dark plains mainly consists of a more coarse-grained fraction of the highland lava plains redeposited near the topographic boundary separating the highlands and lowlands. Deposits of the light plains are dominant at the landing site and are represented by a finer fraction of the material of the lava plains and light mantle material, in which clay minerals are likely predominant.

中文翻译：

---

ExoMars候选登陆点Oxia Planum的地貌分析

摘要

本文致力于对Oxia Planum地区的表面进行详细的光学地质和地形分析，该地区是ExoMars任务漫游车最有可能着陆的地点。着陆点由两个地形区域（高地和低地）组成，由一个尖锐的区域斜坡隔开。高地域约占登陆站点的25％。该区域的主要单元是熔岩平原，其绝对模型年龄为3.65 Ga。这些平原向西延伸，几乎覆盖了低地的整个表面，它们被相对薄的（最初的几十米）层覆盖。在河流活动期间从高地移走的材料。其最后阶段的年龄估计为3.53 Ga。ExoMars流浪者所要测试的材料主要与最终的积累阶段有关，并以低地内深色和浅色光滑平原的沉积为代表。黑暗平原的材料主要由高密度熔岩平原的较粗粒部分组成，该高熔岩平原重新沉积在分隔高地和低地的地形边界附近。轻平原的沉积物在着陆点占主导地位，并以熔岩平原和轻地幔物质的较细部分为代表，其中粘土矿物可能占主导地位。黑暗平原的材料主要由高密度熔岩平原的较粗粒部分组成，该高熔岩平原重新沉积在分隔高地和低地的地形边界附近。轻平原的沉积物在着陆点占主导地位，并以熔岩平原和轻地幔物质的较细部分为代表，其中粘土矿物可能占主导地位。黑暗平原的材料主要由高密度熔岩平原的较粗粒部分组成，该高熔岩平原重新沉积在分隔高地和低地的地形边界附近。轻平原的沉积物在着陆点占主导地位，并以熔岩平原和轻地幔物质的较细部分为代表，其中粘土矿物可能占主导地位。