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Perseverance rover reveals an ancient delta-lake system and flood deposits at Jezero crater, Mars
Science ( IF 44.7 ) Pub Date : 2021-10-07 , DOI: 10.1126/science.abl4051
N Mangold 1 , S Gupta 2 , O Gasnault 3 , G Dromart 4 , J D Tarnas 5 , S F Sholes 5 , B Horgan 6 , C Quantin-Nataf 4 , A J Brown 7 , S Le Mouélic 1 , R A Yingst 8 , J F Bell 9 , O Beyssac 10 , T Bosak 11 , F Calef 5 , B L Ehlmann 12 , K A Farley 12 , J P Grotzinger 12 , K Hickman-Lewis 13, 14 , S Holm-Alwmark 15, 16, 17 , L C Kah 18 , J Martinez-Frias 19 , S M McLennan 20 , S Maurice 3 , J I Nuñez 21 , A M Ollila 22 , P Pilleri 3 , J W Rice 9 , M Rice 23 , J I Simon 24 , D L Shuster 25 , K M Stack 5 , V Z Sun 5 , A H Treiman 26 , B P Weiss 5, 11 , R C Wiens 22 , A J Williams 27 , N R Williams 5 , K H Williford 5, 28
Affiliation  

Observations from orbital spacecraft have shown that Jezero crater, Mars, contains a prominent fan-shaped body of sedimentary rock deposited at its western margin. The Perseverance rover landed in Jezero crater in February 2021. We analyze images taken by the rover in the three months after landing. The fan has outcrop faces that were invisible from orbit, which record the hydrological evolution of Jezero crater. We interpret the presence of inclined strata in these outcrops as evidence of deltas that advanced into a lake. In contrast, the uppermost fan strata are composed of boulder conglomerates, which imply deposition by episodic high-energy floods. This sedimentary succession indicates a transition, from a sustained hydrologic activity in a persistent lake environment, to highly energetic short-duration fluvial flows.

中文翻译:

毅力号火星车揭示了火星 Jezero 陨石坑的古老三角洲湖泊系统和洪水沉积物

轨道航天器的观测表明,火星的 Jezero 陨石坑包含一个突出的扇形沉积岩体,沉积在其西部边缘。毅力号火星车于 2021 年 2 月降落在 Jezero 陨石坑。我们分析了火星车在着陆后三个月内拍摄的图像。扇形有从轨道上看不到的露头面,记录了 Jezero 陨石坑的水文演变。我们将这些露头中倾斜地层的存在解释为三角洲进入湖泊的证据。相比之下,最上部的扇形地层由砾岩组成,这意味着间歇性高能洪水的沉积。这种沉积序列表明,从持续湖泊环境中的持续水文活动到高能量的短期河流流动的转变。
更新日期:2021-10-08
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