Science. 1983 Jun 10;220(4602):1158-61. doi: 10.1126/science.220.4602.1158.
Submillimeter-sized metallic spheres extracted from soil in the Tunguska region of central Siberia contain noble metals in cosmic proportions. The trace element composition and geographical distribution of these spheres suggest that they are from the 30 June 1908 Tunguska explosion and not meteoritic ablation products falling continuously on the earth. Debris from this explosion was also discovered in a South Pole ice core; this discovery indicates that the Tunguska object exploded in the atmosphere with subsequent stratospheric injection and transport of the debris. The celestial body that exploded over Tunguska weighed more than 7 million tons, was more than 0.16 kilometer in diameter, and may well have been a stony meteorite. This discovery offers a new precision time marker in polar ice strata for the year 1909. The steady-state influx of cosmic matter at the South Pole is estimated to be 1.8 x 10(-8) grams per square centimeter per year, which corresponds to a global influx of 4 x l0(5) tons per year.
从中西伯利亚通古斯卡地区土壤中提取的亚毫米级金属球体含有宇宙比例的贵金属。这些球体的微量元素组成和地理分布表明，它们来自 1908 年 6 月 30 日的通古斯卡爆炸，而不是持续落在地球上的陨石烧蚀产物。在南极冰芯中也发现了这次爆炸的碎片；这一发现表明，通古斯卡物体在大气中爆炸，随后在平流层注入和运输碎片。在通古斯卡上空爆炸的天体重达 700 多万吨，直径超过 0.16 公里，很可能是一颗石陨石。这一发现为 1909 年的极地冰层提供了一个新的精确时间标记。南极的宇宙物质稳定流入估计为每年每平方厘米 1.8 x 10(-8) 克，相当于每年全球流入 4 x l0(5) 吨。
