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Distribution of the subsurface reflectors of the western nearside maria observed from Kaguya with Lunar Radar Sounder
Author(s) -
Oshigami Shoko,
Yamaguchi Yasushi,
Yamaji Atsushi,
Ono Takayuki,
Kumamoto Atsushi,
Kobayashi Takao,
Nakagawa Hiromu
Publication year - 2009
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/2009gl039835
Subject(s) - geology , regolith , basalt , radar , sedimentary depositional environment , facies , geochemistry , geomorphology , astrobiology , structural basin , telecommunications , physics , computer science
The Lunar Radar Sounder (LRS) performed global soundings and detected possible subsurface echoes at the nearside maria. This paper examines the relationship between the distribution of the detected subsurface echoes and the surface ages in the western nearside maria. Continuous subsurface reflectors are clearly detected only in a few areas consisting of about 10% of the western nearside maria at apparent depths from hundreds to more than a thousand meters. These reflectors are not generally the basements of the mare but are the interface between different basaltic rock facies. Comparison between the distribution of the detected subsurface boundaries and the surface ages suggests that most of the detected subsurface reflectors were formed more than 3.4 billion years ago. Based on the strong connection between the accumulation rate of regolith and the absolute age, the detected subsurface boundaries appear to be relatively thick regolith layers accumulated during the depositional hiatuses of basaltic lavas.