典型文献
Influence of Megaregolith on the Thermal Evolution of Mercury's Silicate Shell
文献摘要：
A so-called megaregolith layer that is considered to be produced by continuous impacts in Mercury's early stages is integrated into the thermal evolution models of Mercury to study its influence on the thermal evolution of Mercury's silicate shell.This research first implements a one-dimensional parametric global thermal evolution model.Our results indicate that megaregolith directly affects the thermal evolution of Mercury's silicate shell by virtue of its good insulation performance.The way megaregolith exerts its influence is by prolonging the process of partial melting and reducing the heat loss,resulting in a thicker crust and thinner stagnant lid.As for the deep parts of the silicate shell,it is suggested that more energy is taken away from the mantle due to the longer partial melting,leading to lower temperatures below the crust compared with the case in the absence of megaregolith,which further helps to advance the formation time of the inner core and promote its final size.In addition,we also carry out a simplified two-dimensional mantle convection simulation as a supplement to the one-dimensional model.The two-dimensional simulation depicts a typical mantle plume fractional melting scenario.Our calculations indicate that megaregolith may be key to the long-term volcanic activities on Mercury.As far as the megaregolith itself is concerned,the thermal structure of this particular layer is more sensitive to thermal conductivity,suggesting that for such a highly fragmented structure,the thermal conductivity coefficient plays a key role in its evolution.Our work emphasizes the importance of megaregolith to the evolution of Mercury.
文献关键词：
中图分类号：
作者姓名：
Jing-Chun Xie;Mian Zhang;Cheng-Li Huang
作者机构：
Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China;School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China;CAS Key Laboratory of Planetary Sciences,Shanghai Astronomical Observatory,Chinese Academy of Sciences,Shanghai 200030,China;School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China
文献出处：
引用格式：
[1]Jing-Chun Xie;Mian Zhang;Cheng-Li Huang-.Influence of Megaregolith on the Thermal Evolution of Mercury's Silicate Shell)[J].天文和天体物理学研究,2022(03):271-284
A类：
Megaregolith,megaregolith
B类：
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AB值：
0.513053
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