宇宙尘中金的丰度及其与铱的相关性  

GOLD ABUNDANCE AND ITS CORRELATION WITH IRIDIUM IN COSMIC DUST

作　　者：柴之芳[1] 马淑兰[1] 毛雪瑛[1] 肖小月[2] 欧阳自远[2] 彭汉昌[3] 

机构地区：[1]中国科学院高能物理研究所核技术应用部 [2]中国科学院地球化学研究所 [3]国家海洋局第一海洋研究所

出　　处：《地球化学》1985年第4期323-330,共8页Geochimica

摘　　要：金是亲铁元素，金的浓度与其他一些亲铁元素(如铱、锇、镍、钴和铁等)的相关性具有重要的地球化学与宇宙化学意义。Au与Er属同一类元素，但地壳岩石中的Ir/Au比值较低，这表明金和铱的地球化学行为并不完全相同。Gold contents and its abundance variations in some spherules taken from pelagic sediments, ancient strata and simulated meteorite samples were studied with instru-mental NAA technique of high sensitivity and specificity. The experimental results re-vealed that the concentration of gold in silicate spherules ranges from a few to 30 ppb and the depletion factors relative to C1 meteorites are within the range of 10 to 100, while the magnetic spherules exhibit considerably large scatter in gold concentration, re-flecting the features of their precursors. Ir/Au ratios in various types of cosmic dust fall into the range of extraterrestrial materials (about 3.3). Therefore, Ir/Au can be used as a 'fingerprint' of identifying the origin of cosmic dust.

关 键 词：金 元素丰度 铱 宇宙尘 地幔 分馏 

分 类 号：P618.51[天文地球—矿床学] P595[天文地球—地质学]