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Confirmation of sublunarean voids and thin layering in mare deposits

机译:确认母马沉积物的肺下亚空洞和薄层

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摘要

Typical flow thicknesses of lunar mare basalts were not well constrained in the past, because as craters and rilles age, downslope movement of loose material tends to mix and bury stratigraphy, obscuring the three dimensional nature of the maria. New Lunar Reconnaissance Orbiter Camera high resolution images unambiguously reveal thicknesses of mare basalt layers exposed in impact craters, rilles, and steep-walled pits. Pits up to one hundred meters deep present relatively unmodified, near-vertical sections of mare in three cases, and many young impact craters also expose well preserved sections of mare. Oblique views of each pit and many of these craters reveal multiple layers, 3 to 14 m thick, indicating that eruptions typically produced a series of ~10 m thick flows (or flow lobes) rather than flows many tens to hundreds of meters thick. Additionally, these images unambiguously show that the floors of two pits extend beneath the mare surfaces, thus revealing sublunarean voids of unknown lateral extent. We also document the occurrence of pits that may be expressions of collapse into subsurface voids in non-mare impact melt deposits. These voids are compelling targets for future human and robotic exploration, with potential as temporary shelters, habitations, or geologic museums.
机译:过去,月球母玄武岩的典型流动厚度没有受到很好的限制,因为随着火山口和小溪的老化,松散物质的下坡运动趋向于混合并掩埋地层,掩盖了马里亚岩的三维特征。新的“月球侦察轨道飞行器”摄像机的高分辨率图像清楚地揭示了暴露在撞击坑,小溪和陡壁坑中的玄武岩玄武岩层的厚度。在三种情况下,深达一百米的坑呈现出母马相对未变的近垂直部分,而且许多年轻的撞击坑也暴露出保存完好的母马部分。每个矿坑和许多这些坑的斜视图显示了3到14 m厚的多层,表明喷发通常产生一系列约10 m厚的水流(或流瓣),而不是数十至数百米厚的水流。此外,这些图像清楚地表明,两个凹坑的底面在母马表面下方延伸,从而揭示了侧向范围未知的颅底空洞。我们还记录了凹坑的发生,这些凹坑可能是非母体冲击熔体沉积中塌陷成地下孔隙的表现。这些空洞是未来人类和机器人探索的引人注目的目标,并有可能作为临时避难所,住所或地质博物馆。

著录项

  • 来源
    《Planetary and space science》 |2012年第1期|p.18-27|共10页
  • 作者单位

    School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA;

    School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA;

    School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA;

    School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA;

    School of Earth and Space Exploration, Arizona State University, Tempe, AZ, USA;

    Hawaii Institute of Geophysics and Planetology, School of Ocean and Earth Science and Technology, University of Hawaii, Honolulu, HI, USA;

    Institut fuer Planetologie, Westfaelische Wilhelms-Universitaet, Muenster, Germany,Brown University, Providence, Rl, USA;

    Institut fuer Planetologie, Westfaelische Wilhelms-Universitaet, Muenster, Germany;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    moon; volcanism; impact melt; shelter; pit; flow;

    机译:月亮;火山冲击熔化庇护;坑;流;

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