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。
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<sub>8</sub> dolomite and H<sub>9</sub> 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<sub>1</sub>-H<sub>2</sub> 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<sub>8</sub>-H<sub>9</sub> wall reek suffered from alkaline hydrothermal suporposition transform and formedacomplicated rare-earth iron ore deposit.
出处
《地球学报》
EI
CAS
CSCD
1994年第Z1期102-110,共9页
Acta Geoscientica Sinica
关键词
硅同位素组成
五氟化溴法
热液交代改造
Si-istotpe composition BrF<sub>5</sub>-analytical method hydrothermal metasomatism and reformation
