School of Earth, Atmospheric, and Environmental Sciences, University of Manchester, Oxford Road, Manchester M13 9PL, UK.
Science. 2009 Dec 11;326(5959):1522-5. doi: 10.1126/science.1179518.
Noble gas isotopes are key tracers of both the origin of volatiles found within planets and the processes that control their eventual distribution between planetary interiors and atmospheres. Here, we report the discovery of primordial Kr in samples derived from Earth's mantle and show it to be consistent with a meteorite or fractionated solar nebula source. The high-precision Kr and Xe isotope data together suggest that Earth's interior acquired its volatiles from accretionary material similar to average carbonaceous chondrites and that the noble gases in Earth's atmosphere and oceans are dominantly derived from later volatile capture rather than impact degassing or outgassing of the solid Earth during its main accretionary stage.
稀有气体同位素是行星内部挥发物的起源以及控制这些挥发物最终在行星内部和大气之间分配的过程的关键示踪剂。在这里，我们报告了从地球地幔中提取的样品中原始 Kr 的发现，并表明它与陨石或分馏太阳星云的来源一致。高精度 Kr 和 Xe 同位素数据共同表明，地球内部的挥发物来自于类似于平均碳质球粒陨石的 accretionary 物质，而地球大气和海洋中的稀有气体主要来自于后期的挥发性捕获，而不是在其主要 accretionary 阶段固体地球的冲击脱气或放气。
