Evaluation of the origin hypotheses of Pantheon Fossae, central Caloris basin, Mercury
Evaluation of the origin hypotheses of Pantheon Fossae, central Caloris basin, Mercury
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DOI：
10.1016/j.icarus.2010.04.014
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发表时间：
2010-09
期刊：
影响因子：
3.2
通讯作者：
C. Klimczak;R. Schultz;A. Nahm
中科院分区：
文献类型：
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作者：
C. Klimczak;R. Schultz;A. Nahm
Pantheon Fossae是一个复杂的结构，由水星Caloris盆地中心的放射状地堑组成，自从信使号航天器首次拍摄到该结构以来，它的起源一直存在争议。三种不同的形成假说已经提出，即与阿波罗多罗斯影响到以前的圆顶Caloris盆地底部，地堑形成的表面表现的岩墙侵入和盆地内部隆起单独的起源。为了检验这些设想，将现有图像的详细观测结果与拟议的形成机制进行了比较。我们通过对地堑特征和模式的详细解释，通过与地球和金星的径向结构进行比较，以及通过对每个形成假设的力学分析，来评估这些起源假设。结果表明，万神殿槽沟的形成是由于在Caloris盆地的中心部分的隆起，更有可能比它已经形成了一个径向对称的应力场集中在或附近的阿波罗陨石坑，这将是由一个岩浆房或叠加在一个预先存在的圆顶由于冲击力学。
The origin of Pantheon Fossae, a complex structure consisting of radial graben in the center of the Caloris basin, Mercury, has been debated since the structure was first imaged by the MESSENGER spacecraft. Three different formation hypotheses have been suggested, i.e. an origin associated with the Apollodorus impact into a previously domed Caloris basin floor, graben formation as surface expressions of dike intrusions and basin-interior uplift alone. In order to test the scenarios, detailed observations from the currently available imagery were compared to the proposed formation mechanisms. We evaluate these origin hypotheses by means of detailed interpretations of the graben characteristics and patterns, by comparing to radial structures from Earth and Venus, and by mechanical analyses for each formation hypothesis. Results indicate that the formation of Pantheon Fossae as the result of doming in the central part of the Caloris basin is more likely than it having formed in association with a radially symmetric stress field centered at or near the Apollodorus crater, that would have been created by a magma chamber or been superimposed on a pre-existing dome due to impact mechanics.