...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Ages of mare basalts on the lunar nearside [Review]
【24h】

Ages of mare basalts on the lunar nearside [Review]

机译：月球附近的玄武岩时代[评论]

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The chronology of lunar volcanism is based on radiometric ages determined from Apollo and Luna landing site samples, regional stratigraphic relationships, and crater degradation and size-frequency distribution data for units largely defined prior to the end of the Apollo program. Here we report on new crater size-frequency distribution data for 139 spectrally and mor phologically defined basalt units which are exposed in six nearside impact basins (Australe, Tranquillitatis, Humboldtianum, Humorum, Serenitatis, and Imbrium). Crater size-frequency distribution measurements are a statistically robust and accurate method to derive absolute model ages of unsampled regions of the Moon. Compared to crater degradation ages, crater size-frequency ages, performed on spectrally defined units, offer significant improvements in accuracy. Our investigation showed that (1) in the investigated basins, lunar volcanism was active for at least 1.5-2.0 b.y., starting at about 3.9-4.0 b.y. and ceasing at similar to2.0 b.y., (2) most basalts erupted during the late Im brian Period at about 3.6-3.8 b.y., (3) significantly fewer basalts were emplaced during the Eratosthenian Period, (4) basalts of Copernican age were not found in any of the investigated basins, (5) lunar basin-filling volcanism probably started within similar to 100 m.y. after the formation of the individual basins. We also assessed the relationship between impact basin age and the history of mare basalt emplacement in these basins. We found that (1) in all pre-Nectarian basins (Australe and Tranquillitatis) as well as in the Humboldtianum basin, which is of Nectarian age, the distribution of surface ages is clearly dominated by only a single peak in the number of erupted units at 3.63.8 b.y., (2) in the younger basins (Humorum, Serenitatis, and Imbrium) a second peak at 3.3-3.5 b.y. is observed, (3) basalt eruptions younger than 2.6 b.y. occur only intermittently, and (4) in the youngest basins, Serenitatis and Imbrium, we see an extended period of active basin-filling volcanism (1.5-1.6 b.y.) which is 500 m.y. longer than in the Australe and Humorum and even similar to1.0 b.y. longer than in Tranquillitatis and Humboldtianum. [References: 116]
机译：月球火山的年代学是根据阿波罗计划和月球登陆点样本确定的辐射年龄，区域地层关系以及在阿波罗计划结束之前大量确定的单位的火山口退化和尺寸频率分布数据确定的。在这里，我们报告了139个光谱和形态上定义的玄武岩单元的新火山口尺寸-频率分布数据，这些玄武岩单元暴露在六个近侧冲击盆地（澳大拉西亚，Tranquillitatis，Humboldtianum，Humorum，Serenitatis和Imbrium）。陨石坑大小-频率分布测量是一种统计上可靠且准确的方法，可得出月球未采样区域的绝对模型年龄。与陨石坑的老化年龄相比，在频谱定义的单位上进行的陨石坑大小-频率老化可以大大提高精度。我们的调查显示，（1）在所调查的盆地中，月球火山活动至少持续了1.5-2.0 b.y.，开始于大约3.9-4.0b.y。并以接近于2.0的降落，（2）在伊布赖恩时代晚期以3.6-3.8的速度喷出的大多数玄武岩，（3）在Eratosthenian时期安置的玄武岩明显减少，（4）哥白尼时代的玄武岩没有在任何调查过的盆地中发现，（5）充满月球盆地的火山活动可能始于大约100 my个别盆地形成后。我们还评估了这些盆地的影响盆地年龄与母马玄武岩侵袭历史之间的关系。我们发现（1）在所有早前的Nectarian盆地（Australe和Tranquillitatis）以及Humboldtianum盆地（均为Nectarian年龄）中，地表年龄的分布显然仅由喷发单位数量的一个峰值控制在（3.6）处为（3.63.8），在较年轻的盆地（Humorum，Serenitatis和Imbrium）中，第二个峰值为（3.3-3.5）观察到（3）玄武岩喷发小于2.6 b.y. （4）在最年轻的盆地Serenitatis和Imbrium中，我们发现活跃的盆地充填火山活动持续了很长时间（1.5-1.6 b.y.），即500m.y。比在澳大利亚和肱骨中更长的时间，甚至比1.0 b.y.y.比在Tranquillitatis和Humboldtianum中更长。 [参考：116]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号