...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >The production rate of cosmogenic deuterium at the Moon's surface
【24h】

The production rate of cosmogenic deuterium at the Moon's surface

机译：在月球表面的美容氘的生产率

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 hydrogen (D/H) isotope ratio is a key tracer for the source of planetary water. However, secondary processes such as solar wind implantation and cosmic ray induced spallation reactions have modified the primordial D/H signature of 'water' in all rocks and soils recovered on the Moon. Here, we re-evaluate the production rate of cosmogenic deuterium (D) at the Moon's surface through ion microprobe analyses of hydrogen isotopes in olivines from eight Apollo 12 and 15 mare basalts. These in situ measurements are complemented by CO2 laser extraction-static mass spectrometry analyses of cosmogenic noble gas nuclides (He-3, Ne-21, Ar-38). Cosmic ray exposure (CRE) ages of the mare basalts, derived from their cosmogenic Ne-21 content, range from 60 to 422 Ma. These CRE ages are 35% higher, on average, than the published values for the same samples. The amount of D detected in the olivines increases linearly with increasing CRE ages, consistent with a production rate of (2.17 +/- 0.11) x 10(-12) mol(g rock)(-1) Ma(-1). This value is more than twice as high as previous estimates for the production of D by galactic cosmic rays, indicating that for water-poor lunar samples, i.e., samples with water concentrations <= 50 ppm, corrected D/H ratios have been severely overestimated. (C) 2017 Elsevier B.V. All rights reserved.
机译：氢气（D / H）同位素比是行星水源的关键示踪剂。然而，太阳能植入和宇宙射线诱导的椎间光化反应的二级过程已经修改了在月球上恢复的所有岩石和土壤中的“水”的原始D / H签名。在这里，我们通过橄榄石的氢同位素的离子微探测器分析来重新评估月球表面的富含渗透表面的氘（D）的生产率。这些原位测量通过Co2激光萃取 - 静态质谱分析来互补富含贵族惰性气体核素（He-3，Ne-21，Ar-38）。宇宙射线暴露（CRE）源于母马基的底座，源自其美容Ne-21含量，范围为60至422 mA。这些CRE年龄较高，平均比同一样品的公布值更高。在橄榄石中检测到的D的量随着CRE老年的增加而导致线性增加，与（2.17 +/- 0.11）×10（-12）摩尔（G岩）（ - 1）mA（-1）的生产速率一致。该值是通过银河系宇宙射线生产D的先前估计的两倍，表明用于水贫气球样品，即水浓度的样品<= 50ppm，校正的D / H比率受到严重高估。 （c）2017年Elsevier B.V.保留所有权利。

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