撞击坑
地质学
乌托邦
火星探测计划
火山作用
火山
熔岩
堤坝
天体生物学
构造盆地
地球科学
古生物学
构造学
艺术
物理
艺术史
作者
Xing Wu,Liu Yang,Chaolin Zhang,Yuchun Wu,Feng Zhang,Jun Du,Zhenghao Liu,Yan Xing,Rui Xu,Zhiping He,Yangting Lin,Yongliao Zou
出处
期刊:Icarus
[Elsevier]
日期:2021-08-14
卷期号:370: 114657-114657
被引量:49
标识
DOI:10.1016/j.icarus.2021.114657
摘要
China's first Mars mission Tianwen-1 successfully touched down the surface of the southern Utopia Planitia on 15th May 2021. In this study we investigate the geological characteristics of the target landing site (Site 1) and a backup landing site (Site 2) on Utopia Planitia for Tianwen-1 Mission. Site 1 is located in a topographic low and generally flat area to the southern Utopia basin, while Site 2 is located in the Utopia-Elysium transition zone. Several geological features indicative of the presence of a large reservoir of volatiles are identified and mapped in detail for both landing sites, including pitted cones, giant polygons, rampart and pancake craters. The volcanism-related morphologies, e.g., lava flows, lahars, and dikes, are also mapped for Site 2. The compositional analysis reveals little exposures of hydrous materials due to dust cover and/or lacking of data coverage over the regions. Crater counting analysis showed that the Site 1 has an absolute model age of ~3.68 Ga and ~3.45 Ga when including and excluding ghost craters, respectively. The absolute model age of Site 2 is ~3.34 Ga. Finally, the evolutionary history of the Utopia Planitia is discussed, and the related scientific hypotheses to be tested for the in situ exploration are suggested. Our study provides a framework for the Tianwen-1 in situ exploration, which will impose important constraints on the nature and evolution history of the northern lowlands.
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