【摘要】 <正> 1965年2月28日13时左右,在吉林省洮南县东南方向飞来三块陨石(照片1、2),坠落在洮南县万宝公社炮台屯前、后和东升公社桂林大队后山坡三处,其分别重2550克、1100克、100克。三块陨石大致呈南东-北西向分布(东经122°,北纬45°47′),相距半公里左右。更多还原

【Abstract】 On February 28, 1965, the Taonan chondrite fell near the northwest of Taonan County, Jilin Province (122°E, 45°47’N). The total recovered mass was about 3.75kg in weight (2,550, 1,100 and 100g). Its chemical composition shows that the Taonan chondrite belongs to L-group chondrites. Petrochemically, it should be designated to type 5. The major minerals present in the chondrite include: olivine (Fa = 23±%), orthopyroxene (F3= 20±%), plagioclase, zircon, quartz, kamacite, taenite, troilite, chromite native copper and cassiterite. Shock effect is obvious in olivine and orthopyroxene. Two stages of evolution have been involved in the crystallization of troilite.更多还原