火星的乌托邦盆地被朱龙探测器雷达发现
Chao Li1, Yikang Zheng2, Xin Wang1
1Key Laboratory of Earth and Planetary Physics, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China.
Nature
|September 26, 2022
概括
在火星的Utopia Planitia上发现了一层70米厚的结构. 这种地下地质表明火星的晚赫斯佩里亚到亚马逊时期有偶尔的洪水和盆地填充.
科学领域:
- 星球科学
- 地质学
- 地质学
背景情况:
- 了解火星地下结构对于解读地质历史,水文进化和过去的气候变化至关重要.
- 乌托邦平原是一个大型冲击盆地, 是一个关键的目标,
- 之前的维京2的地面数据已经超过45年了.
研究的目的:
- 在Utopia Planitia的火星地下进行地面透雷达调查.
- 构建一个详细的地下图像,以了解地质层.
- 研究该地区过去的水活动和地质过程的潜力.
主要方法:
- 使用朱龙探测器的地面透雷达进行现场调查.
- 进行了大约1171米的穿越, 收集地下数据.
- 构建了调查区域的详细地表图像概况.
主要成果:
- 在薄薄的 regolith 层 (<10米) 下发现了大约 70 米厚的多层地下结构.
- 雷达图像显示有时发生的水力洪水和沉积,
- 填充过程被解释为发生在晚赫斯佩里亚到亚马逊时代.
结论:
- 观察到的分层结构支持偶尔的水力洪水作为乌托邦平原盆地填充的机制.
- 虽然没有直接检测到液态水,但地下盐冰的可能性仍然存在.
- 这些发现为Utopia Planitia的地质演变和潜在水文历史提供了新的见解.
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