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产在吉南元古宙石英岩内的宇宙尘是一个宇宙尘系列 ,由 4亚型 4小类组成 :①金属球粒 :a .纯铁球粒 ;b .FCN(Fe、Cr、Ni)球粒 ;②氧化物球粒 :c.普通磁性铁质球粒 ;d .FCS(FeO、Cr2 O3、SiO2 )球粒 ;③玻璃质球粒 ;④氧化物 -金属过渡型球粒。其中FCN球粒和FCS球粒为富铬球粒 ,在地球上属首次发现 ;FCN球粒为天然的奥氏体不锈钢球粒。FCN球粒的发现表明冶金学与地外源事件地球化学有一定联系。富铬宇宙尘的发现 ,预示着地球上可能有铁铬镍型铁陨石存在。
Cosmic dust produced in the jnan archean quartzite is a series of cosmic dust consisting of 4 subtypes of 4 subtypes: ① metal pellets: a. Pure iron pellets; b. FCN (Fe, Cr, Ni) balls Pellets; ② oxide pellets: c. Ordinary magnetic iron pellets; d .FCS (FeO, Cr2 O3, SiO2) pellets; ③ vitreous pellets; ④ oxide - metal transitional pellets. Among them, FCN pellets and FCS pellets are chromium-rich pellets, which were first found in the earth; FCN pellets are natural austenitic stainless steel pellets. The discovery of FCN pellets shows that metallurgy has some connection with geo-exogenous events. The discovery of chromium-rich cosmic dust indicates the possible presence of Fe-Cr-Ni ferrous meteorites on Earth.