大气粉尘主要是风成的硅酸盐矿物尘粒,其粒径<10微米,能被中等强度的风携带上高空并运到很远的地方。对自然界尘土的矿物研究,已有很长的历史。远在本世纪初,就有人用光学显微镜来进行鉴定,并称这种物质是“随世界性的风而漂流的尘土”。自从六十年代末,我们开始使用质谱测定粉尘大小的石英中的氧,研究其同位素比率,追索其来源或成因。 Atmospheric dust is predominantly silicate mineral dust, which has a particle size of <10 microns and can be carried at high altitudes by moderately strong winds and transported far enough. The study of minerals in the dust of nature has a long history. As early as the beginning of this century, some people use light microscopy to identify and call it “dust drifting with the wind of the world.” Since the late sixties, we began to use mass spectrometry to determine oxygen in dust-sized quartz, studying its isotope ratio, and tracing its origin or cause.