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首页> 外文期刊>Journal of geophysical research. Planets >An Impact Crater Origin for the InSight Landing Site at Homestead Hollow, Mars: Implications for Near Surface Stratigraphy, Surface Processes, and Erosion Rates
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An Impact Crater Origin for the InSight Landing Site at Homestead Hollow, Mars: Implications for Near Surface Stratigraphy, Surface Processes, and Erosion Rates

机译：MARSEAD空心洞中洞察着陆位点的影响火山口起源：对近地表地层，表面过程和侵蚀率的影响

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摘要

The InSight mission to Mars landed within Homestead hollow on an Early Amazonian lava plain. The hollow is a 27-m-diameter, 0.3-m-deep quasi-circular depression that shares morphologic and sedimentologic characteristics to degraded impact craters. Unlike the intercrater plains outside of the hollow, the interior lacks cobbles and is dominated by loose sand, granules, and pebbles. Fresher craters near the landing site exhibit meter-scale bedforms in their ejecta and on their floors due to sediment trapping. The sedimentology of the interior fill of Homestead hollow suggests similar trapping. The hollow falls along a morphologic continuum that requires low rates of rim degradation and fill. Crater degradation rates (rim erosion plus filling) in the landing site decline nonlinearly through time from 10~(-2) to 10~(-4) m/Myr as craters evolve to a hollow-like form. Rim erosion rates are lower initially, at 10~(-3) m/Myr, but converge with degradation rates to 10~(-4) m/Myr. This implies that while filling plays an important role soon after crater formation, it is limited in later stages. Crater statistics indicate that the bulk of the fill occurred in the first ~50 Myr for Homestead hollow. The estimated maximum age of the hollow is ~400 to 700 Myr. This requires near-zero fill aggradation and long-term soil stability for the bulk of the crater's history. Fill stability manifests in Homestead hollow as a ~5- to 10-cm-thick duricrust, formed by exchanges of atmospheric water vapor with soil. The estimated degradation in the hollow requires ~2 to 3 m of sedimentary fill beneath the lander.
机译：在早期的亚马逊熔岩平原上，火星的洞察力使命落在宅基地内。中空是27-m直径，0.3米深的准圆形凹陷，分享形态和沉积学特征，以降解抗冲击器。与中空外部的交流术平原不同，内部缺乏鹅卵石，并以松散的沙，颗粒和鹅卵石为主。由于沉积物诱捕，着陆位点附近的渐柏陨石坑展示了仪表尺度床位，并在其地板上。 Homestead凹陷内部填充的沉积学表明类似的诱捕。中空沿着形态的连续体落下，需要低rim劣化和填充的速率。降落部位中的火山口退化率（RIM侵蚀加填充）通过10〜（2）至10〜（-4）M / MYR的时间下降，因为陨石坑进化到空心形式。 RIM侵蚀率最初较低，10〜（3）M / MYR，但会聚到10〜（-4）M / MYR的降解速率。这意味着虽然在火山口形成后填充发挥着重要作用，但它在后期阶段受到限制。火山口统计数据表明，填充的大部分发生在宅基地空洞的第一个〜50人中。空心的估计的最大年龄是〜400至700 myr。这需要接近零填充汇编和长期土壤稳定性，为火山口的历史大部分。填充宿主中的稳定性表现为〜5至10cm厚的杜兰氏菌，由具有土壤的大气水蒸气的交换形成。中空中的估计降解需要〜3米在着陆器下面的沉积填充。

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  • 作者

    N. H. Warner; J. A. Grant; S. A. Wilson; M. P. Golombek; A. DeMott; C. Charalambous; E. Hauber; V. Ansan; C. Weitz; T. Pike; N. Williams; M. E. Banks; F. Calef; M. Baker; M. Kopp; M. Deahn; H. Lethcoe; L. Berger;

  • 作者单位

    Department of Geological Sciences 1 College Circle SUNY Geneseo Geneseo NY USA;

    Center for Earth and Planetary Studies Smithsonian National Air and Space Museum Washington DC USA;

    Center for Earth and Planetary Studies Smithsonian National Air and Space Museum Washington DC USA;

    Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA;

    Department of Geological Sciences 1 College Circle SUNY Geneseo Geneseo NY USA;

    Department of Electrical and Electronic Engineering Imperial College London London UK;

    German Aerospace Center (DLR) Institute of Planetary Research Berlin Germany;

    Laboratory of Planetary Geodynamics University of Nantes Nantes France;

    Planetary Science Institute Tucson AZ USA;

    NASA Goddard Space Flight Center Greenbelt MD USA;

    Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA;

    NASA Goddard Space Flight Center Greenbelt MD USA;

    Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA;

    Center for Earth and Planetary Studies Smithsonian National Air and Space Museum Washington DC USA;

    Department of Geological Sciences 1 College Circle SUNY Geneseo Geneseo NY USA;

    Department of Geological Sciences 1 College Circle SUNY Geneseo Geneseo NY USA;

    Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA;

    Jet Propulsion Laboratory California Institute of Technology Pasadena CA USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 行星、卫星、彗星、流星、陨星;
  • 关键词

    Impact Crater Origin; InSight Landing; Surface Processes;

    机译：冲击火山口起源;洞察着陆;表面过程;

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