冀北侏罗系上统火山岩中宇宙尘的发现及其地质意义

在冀北丰宁、沽源、赤城一带的上侏罗统火山岩中发现有不同形态的铁质及玻璃质微球粒。经电镜扫描及外貌结构构造的鉴定，显示有熔融、碰撞、逸气、旋纹、冷疑、收缩等特征；经电子探针及Ｘ射线粉晶衍射分析，认为是宇宙尘。对其进行研究不仅有重要的地质意义，而且有找矿意义。

DISCOVERY OF COSMIC DUST IN UPPER JURASSIC IGNEOUS ROCKS IN NORTHERN HEBEI PROVINCE AND ITS GEOLOGICAL SIGNIFICANCE

he authors have discovered iron and glassy balls with different shapes in Upper Jurassic igneous rocks in Fengning, Guyuan and Chicheng counties in northern Hebei Province. These balls show the characteristics of melting, colliding, gasfreeing, spinning,condensing and contracting through the identification of electron microscope and the external structure. They also have different compositions with that of normal rocks and minerals in the Earth. So,the authors consider that cosmic dust comes from the materials of sputtering of the moon and melting of meteorites and meteoroids. The researches on them have significance of seeking mineral deposit resources as well as that of geology'