深海沉积物中硅质小球的稀土元素丰度特征

近年来对宇宙尘的研究已成为宇宙化学和天文地质学界中的一个很活跃的领域。作者利用中子活化法测定了从深海沉积物中挑选出的硅质和玻璃质小球中的微量元素的含量。结果表明,这些硅质和玻璃质小球主要属地外来的物质。

Characteristics of REE Abundances of Siliceous Spherules from Deep-Sea Sediments

In recent years, the study of cosmic dust has been a very active field in cosmochemistry and astronomical geology in that it can provide valuable information about the origin and evolution of the solar system and Galaxy. Those spherules, however, are too small to be analyzed by the normal chemical analytical techniques. The aim of our work is to use INAA for determining the trace elements in the siliceous and vitreous spherules picked up from deep-sea sediments. The experimental results demonstrate that the spherules of different origins have different chemical compositions. In our work REE in siliceous and vitreous spherules were analyzed, and their REE patterns normalized to C_1 chondrite were made. It can be seen through the work that the crustal samples have undergone chemical fractionation while some siliceous and vitreous spherules have obviously not, which favors their extraterrestrial origin.