Thickness of proximal ejecta from the Orientale Basin from Lunar Orbiter Laser Altimeter (LOLA) data: Implications for multi‐ring basin formation
Thickness of proximal ejecta from the Orientale Basin from Lunar Orbiter Laser Altimeter (LOLA) data: Implications for multi‐ring basin formation
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DOI：
10.1029/2011gl048502
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发表时间：
2011-09
影响因子：
5.2
通讯作者：
C. Fassett;J. Head;David E. Smith;M. Zuber;G. Neumann
中科院分区：
文献类型：
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作者：
C. Fassett;J. Head;David E. Smith;M. Zuber;G. Neumann
量化月球大型盆地周围的喷出物分布，对于了解盆地环的起源、瞬变空腔的体积、采样深度以及盆地形成过程的性质具有重要意义。本文利用月球轨道激光测高仪（LOLA）获得的最新月球测高数据，估算了月球上最年轻、保存最完好的大型撞击盆地——Orientale撞击盆地周围区域的喷出物厚度。我们的测量结果显示，在科迪勒拉山脉附近（Orientale的地形边缘）的喷出物厚度为~ 2900米，在215公里的范围内衰减到~ 1公里。这些测量表明，在从科迪勒拉环到一个盆地直径约2.9 × 106 km3的径向范围内，该区域有喷出物的体积，并允许推导出喷出物-厚度衰减模型，该模型可以与挖掘体积和瞬态空洞大小的估计进行比较。这些数据与Outer Rook山脉作为暂态空洞边缘峰的大致位置一致，表明该位置外的盆地喷出物总量为~ 4.8 × 106 km3。
Quantifying the ejecta distribution around large lunar basins is important to understanding the origin of basin rings, the volume of the transient cavity, the depth of sampling, and the nature of the basin formation processes. We have used newly obtained altimetry data of the Moon from the Lunar Orbiter Laser Altimeter (LOLA) instrument to estimate the thickness of ejecta in the region surrounding the Orientale impact basin, the youngest and best preserved large basin on the Moon. Our measurements yield ejecta thicknesses of ∼2900 m near the Cordillera Mountains, the topographic rim of Orientale, decaying to ∼1 km in thickness at a range of 215 km. These measurements imply a volume of ejecta in the region from the Cordillera ring to a radial range of one basin diameter of ∼2.9 × 106 km3 and permit the derivation of an ejecta‐thickness decay model, which can be compared with estimates for the volume of excavation and the size of the transient cavity. These data are consistent with the Outer Rook Mountains as the approximate location of the transient cavity's rim crest and suggest a volume of ∼4.8 × 106 km3 for the total amount of basin ejecta exterior to this location.