Mare volcanism: Reinterpretation based on Kaguya Lunar Radar Sounder data
Mare volcanism: Reinterpretation based on Kaguya Lunar Radar Sounder data
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DOI：
10.1002/2013je004568
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发表时间：
2014-03
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影响因子：
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通讯作者：
S. Oshigami;Shiho Watanabe;Y. Yamaguchi;A. Yamaji;Takao Kobayashi;A. Kumamoto;K. Ishiyama;T. Ono
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作者：
S. Oshigami;Shiho Watanabe;Y. Yamaguchi;A. Yamaji;Takao Kobayashi;A. Kumamoto;K. Ishiyama;T. Ono
辉夜号（SELENE）上的月球雷达探测器（LRS）在近侧月海下方发现了广泛的水平反射体。先前的研究估计，地下反射层的深度可达数百米，并表明这些反射层是海海玄武岩单元之间的界面。将LRS数据中检测到的反射体与指示每个玄武岩单元形成年龄的表面年龄图进行比较，使我们能够讨论每个玄武岩单元的下限体积及其空间和时间变化。我们估计了近侧海海中年龄为 2.7 Ga 至 3.8 Ga 的玄武岩单元的体积，包括 Mare Crisium、Mare Humorum、Mare Imbrium、Mare Nectaris、Mare Serenitatis、Mare Smythii 和 Oceanus Procellarum。本研究估计的地质单元的下限体积约为 103 至 104 平方公里。这一体积范围与月球蜿蜒细沟形成热侵蚀模型数值模拟得出的喷发熔岩流总量一致，也与古生代后形成的大陆溢流玄武岩单元的平均流量和地球上太古代科马提岩流的计算流量相当。根据单位体积估算的平均喷发率下限约为 10−5 至 10−3 平方公里/年。同一海盆地内，地质海体单元的估计体积和平均喷发率与它们的年龄呈明显的正相关，但在同一年龄范围内，不同海海之间的估计体积和平均喷发率存在明显的正相关关系。
The Lunar Radar Sounder (LRS) onboard Kaguya (SELENE) detected widespread horizontal reflectors under some nearside maria. Previous studies estimated that the depths of the subsurface reflectors were up to several hundreds of meters and suggested that the reflectors were interfaces between mare basalt units. The comparison between the reflectors detected in the LRS data and surface age maps indicating the formation age of each basalt unit allows us to discuss the lower limit volume of each basalt unit and its space and time variation. We estimated volumes of basalt units in the ages of 2.7 Ga to 3.8 Ga in the nearside maria including Mare Crisium, Mare Humorum, Mare Imbrium, Mare Nectaris, Mare Serenitatis, Mare Smythii, and Oceanus Procellarum. The lower limit volumes of the geologic units estimated in this study were on the order of 103 to 104 km3. This volume range is consistent with the total amount of erupted lava flows derived from numerical simulations of thermal erosion models of lunar sinuous rille formation and is also comparable to the average flow volumes of continental flood basalt units formed after the Paleozoic and calculated flow volumes of Archean komatiite flows on the Earth. The lower limits of average eruption rates estimated from the unit volumes were on the order of 10−5 to 10−3 km3/yr. The estimated volumes of the geologic mare units and average eruption rate showed clear positive correlations with their ages within the same mare basin, while they vary among different maria compared within the same age range.