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首页> 外文期刊>Planetary and space science >The transition from complex crater to peak-ring basin on Mercury: New observations from MESSENGER flyby data and constraints on basin formation models
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The transition from complex crater to peak-ring basin on Mercury: New observations from MESSENGER flyby data and constraints on basin formation models

机译:水星从复杂的火山口到峰环盆地的过渡:MESSENGER飞越数据的新观察和盆地形成模型的约束

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摘要

The study of peak-ring basins and other impact crater morphologies transitional between complex craters and multi-ring basins is important to our understanding of the mechanisms for basin formation on the terrestrial planets. Mercury has the largest population, and the largest population per area, of peak-ring basins and protobasins in the inner solar system and thus provides important data for examining questions surrounding peak-ring basin formation. New flyby images from the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft have more than doubled the area of Mercury viewed at close range, providing nearly complete global coverage of the planet's surface when combined with flyby data from Mariner 10. We use this new near-global dataset to compile a catalog of peak-ring basins and protobasins on Mercury, including measurements of the diameters of the basin rim crest, interior ring, and central peak (if present). Our catalog increases the population of peak-ring basins by -150% and protobasins by ~100% over previous catalogs, including 44 newly identified peak-ring basins (total=74) and 17 newly identified protobasins (total=32). A newly defined transitional basin type, the ringed peak-cluster basin (total=9), is also described. The new basin catalog confirms that Mercury has the largest population of peak-ring basins of the terrestrial planets and also places the onset rim-crest diameter for peak-ring basins at 126_(-26)~(+33) km, which is intermediate between the onset diameter for peak-ring basins on the Moon and those for the other terrestrial planets. The ratios of ring diameter to rim-crest diameter further emphasize that protobasins and peak-ring basins are parts of a continuum of basin morphologies relating to their processes of formation, in contrast to previous views that these forms are distinct. Comparisons of the predictions of peak-ring basin-formation models with the characteristics of the basin catalog for Mercury suggest that formation and modification of an interior melt cavity and nonlinear scaling of impact melt volume with crater diameter provide important controls on the development of peak rings. The relationship between impact-melt production and peak-ring formation is strengthened further by agreement between power laws fit to ratios of ring diameter to rim-crest diameter for peak-ring basins and protobasins and the power-law relation between the dimension of a melt cavity and the crater diameter. More detailed examination of Mercury's peak-ring basins awaits the planned insertion of the MESSENGER spacecraft into orbit about Mercury in 2011.
机译:对复杂环形山和多环形盆地之间过渡的峰环盆地和其他影响环形山形态的研究,对于我们了解地球行星盆地形成机制至关重要。水星在内部太阳系中的峰环盆地和原流域拥有最大的人口,并且每个区域最大的人口,因此为研究围绕峰环盆地形成的问题提供了重要的数据。来自水星表面,太空环境,地球化学和测距(MESSENGER)航天器的新飞越图像使近距离观察到的水星面积增加了一倍以上,结合水手10的飞越数据,几乎可以完全覆盖地球表面。我们使用这个新的近全球数据集来编制水星上的峰环盆地和原生盆地的目录,包括测量盆地边缘波峰,内环和中心峰(如果存在)的直径。与以前的目录相比,我们的目录中的峰环盆地人口增加了-150%,原始盆地增加了约100%,其中包括44个新发现的峰环盆地(总数为74)和17个新发现的原始盆地(总数为32)。还描述了一种新定义的过渡盆地类型,即环形峰丛盆地(总数为9)。新的盆地目录确认了水星是地球上最大的峰环盆地人口,并且还将峰环盆地的起始缘顶直径定为126 _(-26)〜(+33)km,处于中等水平在月球上的峰环盆地的起始直径和其他地球行星的起始直径之间。环直径与轮缘峰直径的比值进一步强调了,原始盆地和峰环盆地是与它们形成过程有关的盆地形态连续体的一部分,这与以前的观点不同。峰环盆地形成模型预测与水星盆地目录特征的比较表明,内部熔体腔的形成和修改以及具有火山口直径的冲击熔体体积的非线性缩放为峰环的发展提供了重要的控制因素。功率定律与峰环盆地和原盆地的环直径与轮缘顶直径之比相适应,并且熔体尺寸之间的幂律关系之间的一致性进一步增强了冲击熔体产量与峰环形成之间的关系。腔和弹坑直径。对水星峰顶盆地的更详细检查正等待MESSENGER航天器计划于2011年插入水星轨道。

著录项

  • 来源
    《Planetary and space science》 |2011年第15期|p.1932-1948|共17页
  • 作者单位

    Department of Geological Sciences, Brown University, Box 1846, Providence, Rl 02912, USA;

    Department of Geological Sciences, Brown University, Box 1846, Providence, Rl 02912, USA;

    Department of Geological Sciences, Brown University, Box 1846, Providence, Rl 02912, USA;

    Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723, USA;

    Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723, USA;

    Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723, USA;

    Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Road, Laurel, MD 20723, USA;

    Department of Terrestrial Magnetism, Carnegie Institution of Washington, Washington, DC 20015, USA;

    Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA;

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

    mercury; peak ring; impact process; crater; basin; MESSENGER;

    机译:汞;峰环影响过程;火山口盆地;信使;

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