We report the chemical composition of 176 glass spherules obtained from Antarctica blue ice and deep-sea sediments from the Central Indian Ocean Basin. This study compares the chemistry of glass spherules collected from various reservoirs, thereby allowing us to look into possible bias and efficiency of different collection techniques. Glass spherules have experienced extreme heating among the S-type cosmic spherules, and have suffered significant ablative elemental loss for which their precursors remain ambiguous. The previous model calculation for the glass spherules indicates chemical changes due to atmospheric entry. In addition, the earlier heating experiment results for the glass spherules show some insight into their formation processes. We report Ca–Al glass spherules that have high CaO+Al₂O₃ >9 wt% indicating larger particles with excessive evaporation of moderately volatiles (Fe, Si, Mg) resulting in refractory (Ca, Al) enriched glass or equilibration of minor Ca and Al phases in glass. Glass spherules from Antarctica and deep-sea are morphologically distinct and happen to have ablated most of their elemental Fe during atmospheric entry, however despite it, their bulk chemical composition and atomic ratios indicate to have a broad correspondence with carbonaceous chondrites, thereby, preserving the precursor properties.

我们报告了从南极洲的蓝色冰和中印度洋盆地的深海沉积物中获得的176个玻璃小球的化学成分。这项研究比较了从各种容器中收集的玻璃小球的化学性质，从而使我们能够研究不同收集技术可能产生的偏差和效率。玻璃球在S型宇宙球中经历了极度加热，并且遭受了明显的烧蚀性元素损失，因此前体仍然模棱两可。玻璃球的先前模型计算表明由于大气进入而引起的化学变化。另外，较早的玻璃球加热实验结果显示了对玻璃球形成过程的一些了解。我们报告了具有高CaO + Al ₂ O的Ca–Al玻璃球₃ > 9 wt％表示较大颗粒，中等挥发分（Fe，Si，Mg）过度蒸发，导致难熔（Ca，Al）富集玻璃或玻璃中次要Ca和Al相平衡。来自南极洲和深海的玻璃小球在形态上截然不同，并且在大气进入过程中碰巧消除了大部分元素铁，尽管如此，它们的整体化学组成和原子比表明与碳质球粒陨石有广泛的对应关系，因此可以保留前体性质。