| 内蒙古白云鄂博稀土、铁矿床的硅同位素组成 |
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| 引用本文：魏菊英,蒋少涌,万德芳.1994.内蒙古白云鄂博稀土、铁矿床的硅同位素组成[J].地球学报,15(1,2):102-110. |
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| 中文摘要:主矿、东矿矿石及其中的钠辉石、钠闪石、黑云母的δ￣（３０）Ｓｉ值相近，大多在─１．０‰——０．３‰之间，低于Ｈ＿１－Ｈ＿２石英砂岩、石英岩的δ￣（３０）Ｓｉ值（０─０．１‰）。北矿铁矿石的δ￣（３０）Ｓｉ值为０─０．１‰，北矿区塞乌素金矿的δ￣（３０）Ｓｉ值为─０．５‰——０．２‰；它们之间无成因联系。 |
| 中文关键词:硅同位素组成，五氟化溴法，热液交代改造 |
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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) |
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| Abstract: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. |
| keywords:Si-istotpe composition BrF_5-analytical method hydrothermal metasomatism and reformation |
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