| 内蒙古白云鄂博稀土、铁矿床的硅同位素组成 |
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| 关键词:Si-istotpe composition BrF_5-analytical method hydrothermal metasomatism and reformation |
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| THE SILICON ISOTOPE COMPOSITON OF BAYAN OBO RARE-EAKTH IRON ORE DEPOSIT,INNER MONGOLIA Wei Juying(Department of Geology,Peking University) |
| The δ￣(30)Si values of Bayan Obo deposit range from─1.8‰─0.8‰. The δ￣(30)Si of hydrosiderite isthe lowest(─1.8‰), and the δ￣(30)Si of chert is the highest(0.8‰).The δ￣(30)Si values of magnetite-hematite ore and soda-pyroxene,riebeckite, biotite are similar to those of H_8 dolomite and H_9 slate,the great majority of them have δ￣(30)Si values of─1.0‰ 0.3‰.These δ￣(30)Si values are obviouslylower than that of H_1-H_2 quartz-sandstone and quartzite. The silicon isotope composition indicate thatthe Bayan Obo ore deposit was formed firstly by the sedimentary process of proterozoic. Then their oreand their H_8-H_9 wall reek suffered from alkaline hydrothermal suporposition transform and formedacomplicated rare-earth iron ore deposit. |
| WEI Ju-ying,JIANG Shao-yong,WAN De-fang.1994.THE SILICON ISOTOPE COMPOSITON OF BAYAN OBO RARE-EAKTH IRON ORE DEPOSIT,INNER MONGOLIA Wei Juying(Department of Geology,Peking University)[J].Acta Geoscientica Sinica,15(1,2):102-110. |
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